cometadata/datacite-titles-descriptions-related-identifiers huggingface dataset:
DOI: 10.57780/esa-fkm0bkd
title: 0633000

description: For about 30 years we have known that positrons are being born and  annihilated in the central region of our Galaxy. The origin of these positrons however has  remained a mystery. Based on the first 4 years of observations with INTEGRAL/SPI a very recent  publication reported a distinct and totally unexpected asymmetry in the 511 keV line  emission emanating from the inner Galactic disk. This asymmetry resembles one in the distribution  of hard LMXBs as observed by INTEGRAL/IBIS indicating that these systems may be the  dominant origin of the positrons. If this association is confirmed it will be the first  identification of a specific origin for the positrons (apart from the small fraction which must come from the  decay of 26Al). Either way the asymmetry in the 511 keV line emission signifies a unique  characteristic of our Galaxyand gives important clues towards solving a long-standing mystery.  INTEGRAL has capabilities uniquely matched to pursuing this problem - capabilities that will  not be equaled or surpassed for a very long time. It is crucial to use these to verify the  asymmetry in the 511 keVline. To this end we propose a key programme(which could be spread over  multiple observing cycles) that requires in total 4.1 Ms of observation time. This programme is  designed to determine theflux difference between two symmetric fields in the inner disk at (l  b) = (+- 25deg0deg) in a robust and largely model independent way by using a special ?beam  switching? (chopping) pointing strategy. The two fields are in important regions of the inner  Galactic plane that include spiral arm tangents and the 4 kpc dust torus. Our observations can therefore  be used via the general observing programme for studies of a large variety and number of  steady and transient point sources. Other important INTEGRAL science topics that will benefit  from our programme are studies of Galactic disk diffuse line (notably at 18 [truncated! Please see actual data for full text]
DOI: 10.57780/esa-fkqk5lw
title: 8860328

description: Crab Calibration 2016.1 (1661-2): IBIS/SPI
DOI: 10.57780/esa-flgpv7s
title: 1220041

description: It is proposed to monitor the  Musca region pointed at  l= 295.0 deg and b=-2.0 (slightly shifted in b). It is covered so far with only 6 Ms at this positon and reaching only 2Ms at 10 deg off the centre according to the observation tools. This region is rich in HMHBs system as well as also 3Cvs and 4 AGNs. 8 IGRs sources still need to be identified. The HMXBs (11) are characterized by outbursts with enhanced hard X-ray flux and thus ideal for a monitoring programme.  [truncated! Please see actual data for full text]
DOI: 10.57780/esa-fmb1b02
title: 1720011

description: This proposal is aimed on obtaining legacy-level observational datasets on the Milky Way Galactic disk.  The ultimate goal of the entire project is to have model independent and systematics free measurements of the fluxes in nuclear lines (511 keV annihilation emission and 1.8 MeV Al26) and a broad band spectrum of the Galactic background emission which at different energies is provided either by cumulative emission of faint Galactic source or by interaction of low energy cosmic rays with interstellar medium. Taking into account the unique combination of properties of INTEGRAL instruments - broad band coverage large fields of view and possibilities to eliminate the contribution of discrete sources from the total measured photon flux the proposed strategy is the best possible usage of the valuable INTEGRAL time. Wide mapping of the Milky Way during the campaign of Galactic latitude scans also contributes to the legacy of the INTEGRAL observatory giving the opportunity to study the population of Galactic sources at high latitudes. [truncated! Please see actual data for full text]
DOI: 10.57780/esa-fnt1kmy
title: 0060012

description: This observation contains a sequence of OMC full FOV sky image with a high TM allocation on Cygnus X-1.The images are used to accompany the Cygnus first light images of the main instruments.
DOI: 10.57780/esa-fo5lbz6
title: 2070009

description: INTEGRAL TOO Observation of Cyg X-1  in coord with IXPE NuSTAR and NICER
DOI: 10.57780/esa-fo9mvue
title: 0320020

description: Given the already high scientific return of our  INTEGRAL observations of GRS 1915+105 we propose to continue the monitoring of one of the most enigmatic microquasars (and its surroundings with special emphasis on the poorly kown X-ray source IGR J19140+0951) during AO 3. Most of the past observations were  done during the plateau state of GRS 1915+105. Our main goal is to obtain time-resolved hard X-ray spectra of all the fundamental spectral states of GRS 1915+105  in order to understand the origin of its high variability and probe the hierarchical evolution between classes with long uninterrupted X-/Gamma -ray observations.The simultaneous use of JEM-X (and RXTE/PCA) in the softer X-rays IBIS and SPI in the hard X-/Gamma-rays will enable us to test different models: Comptonization by thermal nonthermal or free-fall electrons and/or synchrotron emission from the compact jet and test their possible relation with a given class of variability. In addition we are in position to provide simultaneous radio and infrared observations which will allow us to study the accretion-ejection links further. JEM-X will allow us to discriminate between spectral states in the course of each observation and study with the long exposure time the very low frequency QPOs (<10 mHz). As for the past campaign the INTEGRAL observations will be conducted simultaneously with RXTE in order to explore the rapid variability (0.1-100 Hz) at both low and high energies. We will use all our observations to test the presence of (or put tight constraints on) any annihilation features with SPI. To achieve our goals and especially obtain spectra up to very high energy we need long exposure times. We request that our observations be undertaken in segments of 100 ksec exposures. To meet our scientific goals we require ten such segments each  separated by 2-3 weeks compatible with scheduling constraints. [truncated! Please see actual data for full text]
DOI: 10.57780/esa-fohak08
title: 0399806

description: Galactic Plane Survey for AO 03 and Pattern 06
DOI: 10.57780/esa-fpbe82l
title: 1520004

description: We request a 2-year INTEGRAL program in AO-12 and AO-13 for 4 Ms observation in each year centred on 3C273 in order to obtain the deepest extragalactic wide field observation ever performed in the hard X-rays. The INTEGRAL mission provides us with the best wide angle imaging capabilities in the hard X-ray band above 20 keV available to date. In view of upcoming AOs and future missions we feel that it is time to think about legacy projects which will have a lasting impact on our knowledge of phenomena in the Universe far beyond the missions duration. Such a legacy can be the ultra-deep extragalactic field (UDF) which we propose to observe in the Virgo region centered on 3C273. Together with already exisiting data on this field INTEGRAL will thus achieve 21.5 Msec on this field and a detection sensitivity of 1.5e-12 erg/cm**2/sec for a 5-sigma point source significance in IBIS/ISGRI.This will derive around 100 source detections in total on this field out of which a significant fraction might be Compton thick and/or not previously known in the energy range below 10 keV. The scientific goals of this proposal are manifold: determining the luminosity function of AGN out to a redshift of about z=0.1 resolving 10% of the Cosmic X-ray Background (CXB) deriving an independent measurement of the CXB directly from the IBIS/ISGRI data performing a population study of AGN at hard X-rays in the low and high-luminosity domain and extending the spectral monitoring on 3C273 and of several Seyfert galaxies in the field. [truncated! Please see actual data for full text]
DOI: 10.57780/esa-fqea4ea
title: 8860178

description: OMC FF sequence ISOC V10 onwards: sequence of FF measurements with LED on/off followed by a DC cal.
DOI: 10.57780/esa-fs0at9t
title: 8860302

description: OMC FF sequence ISOC V10 onwards: sequence of ff measurements with LED on/off followed by a DC cal.
DOI: 10.57780/esa-fu8iuzc
title: 1540001

description: We propose a 1Ms TOO observation of a bright black-hole transient either known or unknown to follow its complete transition from hard to soft state. This transition which takes place at high flux levels encompasses marked changes in the properties of the accretion flow and it includes the time at which the ejection of an accelerating relativistic jet stops abruptly. The study of the high-energy properties during the transition is important for our understanding of accretion onto black holes and can only be accomplished with INTEGRAL. A simultaneous large multi-wavelength campaign is being organized to support the proposed observation including other X-ray satellites. The campaign will be centered around the INTEGRAL pointing. The trigger will be provided by a threshold limit in either hard or soft X-ray flux. Such a monitoring  is becoming a key goal in the community working on black-hole binaries. [truncated! Please see actual data for full text]
DOI: 10.57780/esa-fv06zm1
title: 0220119

description: The study of galactic X-ray binaries (XRBs) has matured very rapidly in the past few years: RXTE has allowed us to observe for the first time phenomena that take place at the inner edge of the accretion discs that feed the central black hole or neutron star in these systems  Chandra and XMM-Newton are producing energy spectra of unprecedented quality for some of these objects  systematic studies at radio wavelengths are beginning to show that jets are quite a common phenomenon in XRBs. In short this new era has produced several exciting discoveries but it has also posed new and more sophisticated questions than could have been formulated 2-3 years ago. These motivate us to propose an ambitious program using INTEGRAL in combination with radio and softer X-ray observations (both spectral and timing) of a group of persistent hard-spectra low-mass X-ray binaries. We will probe the relation between radio and (non-thermal) hard X-ray emission in XRBs  this will eventually allow us to understand the physics of the mechanism that produces the hard X-rays and its relation to the relativistic jets seen in several of these sources. We will measure their energy spectra over a very large frequency baseline which we will use to address the issue of the relation between X-ray and bolometric luminosities and their correlation to mass accretion rate. We anticipate the contributions of INTEGRAL to be part of the foundations of this important field. [truncated! Please see actual data for full text]
DOI: 10.57780/esa-fw9mf98
title: 2070012

description: INTEGRAL TOO observations of 4U 1630-47 in coordination with NICER aiming to detect high energy tail in source spectrum and characterise spectral state.
DOI: 10.57780/esa-fyc8fmd
title: 0299917

description: Galactic Centre Deep Exposure for AO 02 and Pattern 17
DOI: 10.57780/esa-fzf95j1
title: 1970011

description: GX 339-4 is the archetype of low-mass X-ray binary/microquasar. It recently entered into a new X-ray outburst (ATels 15577 15578) and was also detected at other wavelengths (radio ATels 1580). The source is currently in a standard hard X-ray state associated with the presence of a strong collimated compact jet. It is a one of the very few microquasar where  multi-wavelength sub-second variability has been detected (ie including infra red observations). As such a multi-wavelength campaign including MeerKat Visir at ESO and the recently launched JWST is currently ongoing (eg ATel 15596). We want to take the opportunity of the next JWST observation scheduled on Sept. 10 @ 00h42 UTC lasting about 3 hours to obtain simultaneous coverage at high-energies with INTEGRAL. This will permit us to probe the > 20 keV spectral region and in particular search for signatures of the said jet. Additionally the fast time variability of the source can be searched with non-standard techniques especially in the range 20-100 keV. While JEM-X will provide a soft X-ray spectrum the core of the justification is based on IBIS (SPI being in annealing during rev 2547 when the JWST observations is meant to occur).   [truncated! Please see actual data for full text]
DOI: 10.57780/esa-g2rwvf7
title: 1770016

description: The source is a famous nearby (z = 0.07) blazar that has been in very high state since last summer. Astronomer Telegram n. 14069 and 14072 report large X-ray and gamma-ray outbursts seen with Swift/XRT and Fermi/LAT respectively that are the brightest ever observed for this source since launch of the missions. Its a historical unprecedented state. It is very bright also in optical/UV. It would be critical if INTEGRAL IBIS could observe the hard X-ray tail of the bright X-ray spectrum and monitor it at another 2-3 epochs if it is found to be bright. [truncated! Please see actual data for full text]
DOI: 10.57780/esa-g4494n4
title: 2020008

description: Despite decades of observations the nature of the hard X-ray/soft gamma-ray emission of Cen A the brightestradio-loud AGN in the hard X-ray sky is still unclear. The two main competing models are thermal Comptonizationand synchrotron self-Compton emission and they predicted a spectral cutoff of roughly 300 keV or above 1 MeVrespectively and requires spectral coverage out to the MeV region to differentiate. INTEGRAL/SPI has spectral coverageto a few MeV and thus capability to constrain where the spectral cutoff occurs and assess the origin of the hardX-ray/soft gamma-ray emission. SPIs high energy resolution can also search for 511 keV annihilation features inthe spectrum on both short and long timescales. Motivated by this we request a multi-year normal time proposal of3 Ms of exposure time in AO-19 and 3 Ms on exposure time in AO-20. [truncated! Please see actual data for full text]
DOI: 10.57780/esa-g4njt2l
title: 0120085

description: We propose INTEGRAL observations of the prominent Gamma-Ray Blazar 3C 279 to determine its yet unknown properties at hard X-ray energies (variability spectrum) and correlate them to simultaneous multifrequency measurements. This will increase our knowledge on the physical nature of the inverse-Compton emission of 3C 279 in particular and might also reveal new insights in its overall emission scenario. Because the observed radiation of 3C 279 is purely of non-thermal origin we are studying jet physiscs and subsequently the physics of particle acceleration by the proposed observations.  [truncated! Please see actual data for full text]
DOI: 10.57780/esa-g5olif7
title: 1370001

description: TOO on MAXI J0911-655 (outise TAC)MAXI J0911-655 (aka Swift J0911.9-6452) is a new X-ray transient first detected by MAXI on February 2016 at a position compatible with the globular cluster NGC 2808 (Atel #8872 8884). The 0.3-10 keV flux observed by Swift showed a small decrease from 2.6(2)E-10 erg/cm^2/s (on March 29) to 2.0(1)E-10 erg/cm^2/s (on April 17). A Chandra observation performed on April 9 detected the source at coordinates RA= 09:12:02.43 Dec = -64:52:06.4 (Atel #8971) consistent with that of source 15 from Servillat (2008 A and A 490 641) who observed the cluster with XMM-Newton when the transient was in quiescence. An ATCA radio observation of the cluster did not detect any source inside the X-ray source error circle down to a 5sigma upper limit of 70 muJy indicating that the accretor is probably a neutron star (Atel #8914).The results of the Swift monitoring of the source can be found for the next few days at: http://www.swift.ac.uk/user_objects/tprods/USERPROD_129.194.8.73_1461141680439/index.phpThe spectrum has been extracted by using the pointing performed on April 17.Globular clusters are ideal environments to produce fast recycled ms pulsars. At present 146 radio ms pulsars and 3 accreting ms pulsars (SAX J1748.9-2021 and NGC 6440 X-2 in NGC 6440 and IGR J18245-2452 in M28) have been detected in 28 globular clusters. The previously discovered INTEGRAL source IGR J18245-2452 (Papitto et al. 2013 Nature 501 515) demonstrated that swings between radio and X-ray pulsar behaviour can take place over time scales as short as a few weeks.Our group triggered today a 70 ks XMM-Newton ToO on MAXI J0911-655 in order to detect pulsations and confirm the presence of a neutron star accretor in this system. We are asking here 70 ks of simultaneous observation with INTEGRAL in order to:  (i) constrain the spectral properties of the source at hard X-rays in order to break the degeneracy among different sp [truncated! Please see actual data for full text]
DOI: 10.57780/esa-g6hmw3w
title: 2020020

description: Four years ago we initiated a multi-year program (AO-16-19) aimed at the creation of an ultra-deep extragalactic field centered on the M81 galaxy. We are requesting a continuation of the program in AO-20 to further improve the sensitivity in this field. This ultra-deep field will become INTEGRALs legacy for studies of the AGN population at hard X-ray fluxes as low as 2x10^-12 erg s^-1 cm^-2 and will provide a ground for the unique synergy of INTEGRAL with the all-sky X-ray surveys by the eROSITA and ART-XC telescopes on board the SRG which has already covered the entire sky four times. This field also opens up an unprecedented view on transient energetic events such as FRBs ULXs etc. occurring in the nearby group of galaxies.We are asking for 2.5Ms of observations to be performed in the AO-20. [truncated! Please see actual data for full text]
DOI: 10.57780/esa-g8sr3ou
title: 2020002

description: We propose to continue the INTEGRAL/multi-wavelengh monitoring of GRS 1915+105 with the goal to understand the tight connections that exist between the different emitting media and placed in a broader context understand accreting-ejecting sources in general. We will still take advantage of other facilities we included in the past AOs (the Sardinia and Medicina radio telescopes Insight-HXMT in the X-rays when GRS 1915+105 is bright enough to be detected and NICER).  Based on the suggestions of AO18s TAC and to continue with the strategy of our AO 19 program we request 10 observations of  90 ks each taken every second revolution in order to 1) probe the physics of accretion by studying the 3--500 keV emission of the source 2) understand the connections between accretion and ejection processes 3) continue monitoring GRS 1915+105 in a rare albeit long-lasting low luminosity state never seen before 2018. Here providing the sources states remains unchanged this program will allow us to accumulate more data and thus have a better view of the (rather unknown) behaviour of this source beyond 200 keV. These 3 points can almost be studied with INTEGRAL only (and our radio program for point 2). In addition INTEGRAL with NICER and HXMT can help to  study the origin of the high variability of GRS 1915+105 constrain physical models of emission processes through broad-band spectral and temporal analysis.   It should be noted that GRS 1915+105 lies in a quite crowded field with many variable sources such as X-ray binaries of all types the enigmatic microquasar SS 433 and a couple of highly absorbed IGR sources. This survey will also  permit all these sources to be studied in a regular manner. Such a monitoring will greatly participate to the INTEGRAL legacy by bringing new data for a dozen of exciting Galactic sources. [truncated! Please see actual data for full text]
DOI: 10.57780/esa-g99vkgn
title: 8860213

description: Crab 2010 special pattern on det corners
DOI: 10.57780/esa-g9aajw2
title: 8860059

description: Crab  180 deg arc  4 deg off-axis  4 deg spacing along arc
DOI: 10.57780/esa-ga9gujy
title: 8860219

description: OMC FF sequence ISOC V10 onwards: sequence of ff measurements with LED on/off followed by a DC cal.
DOI: 10.57780/esa-gae296a
title: 0120039

description:               Our observations with ROSAT ASCA RXTE Beppo-SAX  and  CHANDRA along with information from near-IR  and  Radio all suggest that the super-luminous  and  super-massive star eta-Carinae may be in fact a 5.52 yr period eccentric binary system. The spatial resolution of IBIS affords us to separate gamma-rays from other sources in the rich Carina field for the FIRST time ever and examine directly the heart of eta-Carinae. Gamma-ray observations of eta-Carinae will severely test the binary hypothesis for this object which predicts a DECREASED x-ray but ENHANCED gamma-ray luminosity just after the putative periastron in 2003.47 (for which we will be requesting a fixed time AO2 observation). In order to correctly interpret those data and to understand the nature of eta-Carinae in its normal state we propose an unconstrained observation in this AO. The simultaneous  and  cross-calibrated data from the twin JEM-Xs and IBIS will suit our science aims perfectly.            The large 17degx17deg fully coded dithered IBIS field will also allow us to:1. Identify/Verify 5 EGRET sources in the extended field.IBIS2. Examine timing of the bright Anomalous X-ray Pulsar 1E1048.1-5937. JEM-X/IBIS3. Twenty Radio supernova remnants (SNRs) will be in the extended IBIS field  Sixteen for JEM-Xs. Eight have no identified x-ray counter-parts. Detection of hard x-ray non-thermal emission could be made. JEM-XIBIS4. The 511 keV line may be detected and mapped  cold-cloud/warm cloud shapes couldbe compared -- the 3.5 degree scale of the extended Carina cloud complex is well suited to SPIs 2.5deg resolutionSPI5. Cross-correlate our measured CO(J=4-->3) 460 GHz hot spots with hard x-ray/gamma-ray hot-spots viewed by JEM-X/IBIS/SPI.6. Off-pointed dither fields will provide information on the soft-gamma background.7. Off-pointed dither fields will probe the Carina Flare Super-shell. [truncated! Please see actual data for full text]
DOI: 10.57780/esa-gfhnupg
title: 8860029

description: The 5x5 dither observation with the Crab are used for absolute calibration of the response timing analysis and to improve the imaging calibration. The dither patterns of the different observations are slightly offset to each otherso that the data can combined in a way mimicing different sources (as it was done with the BLC ground calibrationdata). [truncated! Please see actual data for full text]
DOI: 10.57780/esa-gk4m4sd
title: 1520007

description: For as long as X-ray astronomy exists X-ray (and gamma-ray) astronomers consider the Crab supernova remnant to be a steady standard candle suitable as a calibration source. INTEGRAL has been observing the Crab for mainly calibration purposes only about twice per year for a total of about 4 revolutions per AO up to AO-11. Further observations have been sparse and only every now and then it was in the field of view during a few ad-hoc observations of relatively nearby sources. In AO-11 we started a program to monitor the Crab more frequently on a regular basis. We propose to continue this project. The objectives are two-fold: 1) monitor and seek for accompanying flares which have been seen at $>$100MeV by Fermi and AGILE 2) improve on the (cross-) calibration of the INTEGRAL instruments as well as with other high-energy instruments. We propose to look at the Crab every 4th revolution with a single standard 5x5 pattern for 45 ksec. The data will be made public immediately. [truncated! Please see actual data for full text]
DOI: 10.57780/esa-gkbit83
title: 0299821

description: Galactic Plane Survey for AO 02 and Pattern 21
DOI: 10.57780/esa-gkqg9wi
title: 1270008

description: Public ToO observation of GS 1354-645 together with ALMA and ATCA.