cometadata/datacite-titles-descriptions-related-identifiers huggingface dataset:
DOI: 10.57780/esa-jxvrzaw
title: 1540022

description: We propose to perform two 170 ks INTEGRAL ToO observations of a transient millisecond X-ray pulsar in outburst. To constrain the broadband spectrum we also request one 30 ks simultaneous NuSTAR and two 50 ks XMM-Newton observations.  The target can be either one of the fifteen known transient accreting millisecond X-ray pulsars (AMXPs) in the case of a new outburst or a newly observed object of this class. These observations allow  us to study the broad band spectrum in detail from hard to soft X-ray energies as well as the timing properties or eclipsing features of the source during its outburst. The high-statistics spectral information make it possible to disentangle the contributions of soft black body reflection (if any) and hard Comptonized spectral components. Moreover we will detect type-I X-ray bursts and/or for the first time also burst oscillations at high-energy (if present). In particular we will be able to study the energy spectrum in a broad energy range (0.1-300 keV) and with unprecedented high-sensitivity above 20 keV. The INTEGRAL and XMM-Newton observations will also allow a timing analysis to study the pulse profile time lags and pulsed spectrum and so will provide important constraints on emission mechanisms.Similar proposals were approved for the INTEGRAL AO2-AO14 cycles and during these years our ToO has been triggered eight times i.e. in 2003 we observed XTE J1807-294 in 2004 2005 2009 2011 and 2013 we triggered on newly discovered sources IGR J00291+5934 HETE 1900.1-2455 IGR J17511-3057 IGR J17498-2921 and IGR J18245-2452 respectively. In 2015 we triggered on IGR J00291+5934 and SAX J1748.5-2021 (data have been made public because it was not clear whether the source in outburst was the AMXP). [truncated! Please see actual data for full text]
DOI: 10.57780/esa-jzulva2
title: 0299840

description: Galactic Plane Survey for AO 02 and Pattern 40
DOI: 10.57780/esa-jzyd4kd
title: 8860270

description: Crab 2013: SPI/IBIS 5x5 wide rev 1268 and 1269
DOI: 10.57780/esa-k1tp507
title: 0320076

description: Mrk 421 one of the brightest TeV gamma-ray sources in the sky is one of five BL Lac objects which have two broad emission maxima at higher energies than normal BL Lac objects show one at X-ray energies and one at TeV energies. Both maxima are separated by a deep and sharp minimum which lies exactly in the energy range of INTEGRAL and which is nearly unexplored. Both emission components are believed to be connected via a common particle population which creates both emission components by different physical emission processes (Synchrotron and inverse Compton). This conjecture can be tested by simultaneous observations at different wavelengths looking for time correlations of the measured intensities. In addition with INTEGRAL the transition region can be explored for the first time. It is the aim of this proposal to observe Mrk 421 with INTEGRAL when it is in an active state together with radiotelescopes IR and optical telescopes and with Cherenkov telescopes.In its quiescent state Mrk 421 is too weak to be observable by the two main instruments (IBIS and SPI) of INTEGRAL in the r^ant energy range. Therefore an observation of this source with INTEGRAL makes only sense when it is in an active state. So we ask for a ToO observation of this source when it is active. [truncated! Please see actual data for full text]
DOI: 10.57780/esa-k4fsgo7
title: 1370003

description: IceCube HESE 128340 58537957 has been detected 2016-08-14 21:45:54.0 UTC. This ToO provides the possibility of the first prompt INTEGRAL follow-up of a neutrino event.
DOI: 10.57780/esa-k4mpinj
title: 8860261

description: OMC FF sequence ISOC V10 onwards: sequence of ff measurements with LED on/off followed by a DC cal.
DOI: 10.57780/esa-k4pg8io
title: 0220033

description: A basic idea of the unified model is that all Seyfert 2 galaxies harbour a bright Seyfert 1 nucleus which is hidden from our view by an optically and geometrically thick obscuring torus.  The difference between type 1 and 2 objects should only be due to the viewing angle that determines whetehr the galaxy nucleus is seen directly or through a torus of molecular gas and dust grains.  X-ray (2-10 keV) observations have provided strong support for the obscuring torus hypothesis by measuring large (up to 1E22-23 cm-2) column densities of neutral material in Seyfert 2 galaxies.  For the case of cosmic abundances the Thompson cross-section is equal to the photoelectric cross-section at around 10 keV so that this energy may be assumed to be the boundary between photoelectric and Compton dominated regimes.  This energy turns out to be the practical limit of X-ray satellites which can observe Compton thick sources in the photoelectric regime where the emission is dominated by reflection/scattering components.  These borderline objects turn out to be particularly bright in hard (>10 keV) X-rays as at these energies the transparency effect is coupled to a strong reflection component and are therefore interesting targets for INTEGRAL observations.  INTEGRAL allows us to observe these objects well into the Compton dominated regime where the nuclear emission component can be studied and clearly separated from the reflection and absorption effects that dominate the X-ray emissions.  The three Compton-obscured source targets have been selected for studies with INTEGRAL for the basic pragmatic reasons that they are nearby and very bright (~ 1E-10 ergs cm-2 s-1) in hard X-ray emission above 10 keV.  Good spectral measurements will be possible with INTEGRAL enabling us to study the nuclear emission spectrum and the nature of the absorbing material for the interesting case of these borderline Compton thick objects as well as asse [truncated! Please see actual data for full text]
DOI: 10.57780/esa-k5izq1t
title: 1920014

description: We ask for the continuation of the INTEGRAL Key Programme observations of the area of the Galaxy bounded by -20 <= l <= +20 and -15 <= b <= +15 with a total of 2 Msec of observations per AO. The aim is to study the inner region of the Galaxy including the hard X-ray variability of Sgr A*. and to enable significant serendipitous science in the Galactic center region. We do not ask for data rights for any of the sources except for the Galactic Center. [truncated! Please see actual data for full text]
DOI: 10.57780/esa-kbw0zsa
title: 1770012

description: INTEGRAL Observation of Sco X-1Observation to allow z-flip strategy
DOI: 10.57780/esa-kd096dn
title: 0870003

description: As part of our regular monitoring of the Bar in the Small Magellanic Cloud (SMC) with RXTE we have identified a new pulsar with a period of 85s which we have designated as SXP85.4. The discovery of this object was announced in ATel 2813 last August. However because of the large field of view (FOV) of the PCA we are unable to locate this object to better than ~1 degree. We there need to take advantage of the unique INTEGRAL science capability to locate this object to a few arcmins and thereby trigger a Swift or XMM follow-up to locate this object. The key role that only INTEGRAL can play is to reduce the positional uncertainty down from the unmanageable ~1 degree to the few arcmins which permits identification.  [truncated! Please see actual data for full text]
DOI: 10.57780/esa-kdkxzh2
title: 1220035

description: Our group has recently found a systematic shift of the centroid of the 26Al emission line at 1.8 MeV across the inner part of the Galactic plane inconsistent with Galactic rotation but consistent with a spiral arm population of 26Al sources with an excess velocity of about 200 km s-1 away from spiral arms. We have suggested that this velocity offset may be due to an interaction of the superbubbles generated by the massive star groups that also produce the 26Al with dense gas in the spiral arms of the Milky Way. This interpretation implies that 26Al stays at least for some time entirely within the hot tenuous gas because colder gas (HI H2) is known to possess much smaller velocities. Because it is not possible to resolve the Galactic plane signal into individual components attributable to individual groups of stars we propose to test the scenario further with observations of the nearby star forming region in Scorpius-Centaurus (Sco-Cen). The region has produced an X-ray bright superbubble which indicates recent supernova activity. In our scenario we expect the 26Al to be distributed similarly to the X-ray bright gas which moves at its sound speed of around 500 km/s. Any projection on to the line of sight very likely results in detectable 26Al velocity shifts. An earlier INTEGRAL campaign detected the 1.8 MeV line at above 5 significance but could constrain the line shift only to 13775 km s-1 (towards Earth) i.e. consistent with zero within 2. We propose therefore more observations of Sco-Cen to improve the error on the line shift and map 26Al within the Sco-Cen superbubble. [truncated! Please see actual data for full text]
DOI: 10.57780/esa-keh3rg1
title: 0320093

description: We propose INTEGRAL observations of two bright low mass X-ray binariesGX 17+2 and GX 13+1 with an exposuretime of 300 ks.  These observations will be part ofa campaign of coordinated multiwavelength observationsin the radio optical/IR X-ray and$gamma$-ray bands. This project is specifically aimed at studyingthe recently discovered hard power-law tails in luminous Z sourcesand their correlation with ``inferred mass accretion rate(as defined by the position on the X-ray color--color diagram) andother source properties.These high-energy tails seem to be present (or more prominent) at low inferredaccretion rates i.e. at periods of maximum radio emission from thesesources. We plan to directly probe this correlation between radio emission(probably due to jets) and hard tails which might indicate jets as theorigin of hard components in luminous Z sources.This proposal was already accepted in the INTEGRAL AO2 in B priority however the observation could not be performed. [truncated! Please see actual data for full text]
DOI: 10.57780/esa-key1qim
title: 1420025

description: We propose two fixed-time observations of the galactic microquasar SS433during three full INTEGRAL orbits in April 2017 and three full INTEGRAL orbits in November 2017 with a total duration of 1.2 Ms centered at  the middle of the orbital hard X-ray eclipse (orbital phase phi=0) at two  cross-over disc precession phases Psi = 0.37 0.65 of the source (INTEGRAL orbits 1804-1806  (April 12 -- April 17) and 1883-1885 (November 8 -- November 13)). The proposal is a continuation of INTEGRAL observations of the unique galactic source SS433 carried out in previous AOs.The main scientific goal of the new observations is to investigate the orbital light curve in   hard X-rays at the cross-over phase (disk edge-on) in order to probe the structure and features of the supercritical accretion disc and hot scattering corona discovered by previousINTEGRAL observations of this unique galactic microquasar.The proposal is not associated with any of the AO14 Key Programs. [truncated! Please see actual data for full text]
DOI: 10.57780/esa-kht3khf
title: 0420104

description: We propose a Target of Opportunity Observation whenever one of the known pulsating bright transient sources enters an outburst. Part of the proposal are also the new bright pulsating X-ray transients that will be discovered by INTEGRAL or any other current X-ray mission and that do not belong to the Integral Core Programme. More specifically we propose two observations of 200 ks each (total 400 ks) to be performed at two different luminosity states following a strategy which depends on the type of the outburst. The key scientific objectives of the proposal are: the measurement of the spectral parameters of the continuum and of the Cyclotron Resonant Scattering (CRS) structures as a function of system luminosity to study the height and extension of the line forming region in response to the decrease of mass accretion rate  the study of the energy-resolved pulse profiles as a function of the luminosity to test the geometry (fan/pencil) of the beam and  of the B field  he phase resolved measurement of the source spectral parameters for both the continuum emission and CRS harmonics. [truncated! Please see actual data for full text]
DOI: 10.57780/esa-kk0x1yt
title: 8860252

description: This is a public observation where the Earth will drift through the field of view of the INTEGRAL instruments. Results from this observation will help in separating the cosmic and instrumental backgrounds and so ultimately lead to improved background subtraction.Scientifically the main goals are to measure the spectral shape of the cosmic X-ray background emission above 20 keV and to study any high-energy emission from the Earth during storms in auroral regions. [truncated! Please see actual data for full text]
DOI: 10.57780/esa-kk686qj
title: 2070001

description: TOO Observation of fast TOO testnice science
DOI: 10.57780/esa-klgies7
title: 8860188

description: OMC FF sequence ISOC V10 onwards: sequence of FF measurements with LED on/off followed by a DC cal.
DOI: 10.57780/esa-knktfgm
title: 8860031

description: OMC FF #28: repetition of OMC flatfield calibration exposures which failed in revolution 38 due to the TM gaps. There are 4 flatfield exposures 1 dark current exposure and 2 engineering exposures (required to ensure correct OMC transition). [truncated! Please see actual data for full text]
DOI: 10.57780/esa-kosciqt
title: 1020030

description: We propose to use INTEGRAL to obtain high quality broadband hard X-ray spectra of two Compton-thin Seyfert 2s with insufficient hard X-ray coverage to date: our primary object Mkn 348 and a secondary target the NELG NGC 526a. Both targets are X-ray bright and have archival long-term averaged RXTE-PCA spectra as well as XMM-Newton and Suzaku spectra. Our proposed observations with INTEGRAL IBIS/ISGRI and JEM-X combined with the lower energy archival spectra will allow us to deconvolve broadband spectral components constrain Compton reflection and search for high-energy continuum cutoffs. We also request simultaneous XMM-Newton observations to aid in normalizing the low-energy spectrum. [truncated! Please see actual data for full text]
DOI: 10.57780/esa-kqaampt
title: 0399818

description: Galactic Plane Survey for AO 03 and Pattern 18
DOI: 10.57780/esa-ks34aze
title: 0399805

description: Galactic Plane Survey for AO 03 and Pattern 05
DOI: 10.57780/esa-ksy8kd6
title: 1320025

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-kukn4mm
title: 2040020

description: While GRB afterglows are observed in an exceptionally broad range of photon energies an observation in the hard X-ray to soft gamma-ray range is very rarely available.  Part ofthe reason for this consists in limited fields of view of the hard X-ray instruments as well asdifficulty in implementation of very rapid follow-up strategies required for detection of therapidly fading afterglow.Small  number  of  hard  X-ray  afterglow  detections  make  it  difficult  tomake detailedpredictions for expectations of INTEGRAL follow-up of neutrino and gravita-tional wave transients which are thought to be associated with nearby GRBs.Additionally detection of the GRB afterglow in previously poorly explored energy range would  provide  new  important  information  allowing  approach  consistent  understanding  ofthe complex interaction between ultra-relativistic ejecta of the GRB and the circum-burstenvironment.Finally the target of this proposal will serve as a live and practical test for the newly understood unique capacity of INTEGRAL to perform very fast slews which has a potential to provide unique early hard X-ray observations with its large FoV as demonstrated in the case of GW170817 re-pointing.We suggest to perform INTEGRAL pointed follow-up of exceptionally bright and luminous GRBs.Taking into account difficulty of rapid follow-up we only request observation inthe most favourable conditions when it is technically feasible to to start the ToO very soon after the event. [truncated! Please see actual data for full text]
DOI: 10.57780/esa-kwvvy6u
title: 2070010

description: The galactic ULX Swift J0243.6+6124 is again in outburst after the 2017 event. INTEGRAL TOO monitoring observations will be performed.
DOI: 10.57780/esa-l06ian9
title: 1270005

description: TOO on V404 Cyg to overlap with HST
DOI: 10.57780/esa-l21cs9q
title: 8860325

description: EO 4.2
DOI: 10.57780/esa-l2ivuee
title: 8860348

description: Crab Calibration 2017.2 (1856-57): IBIS/SPI
DOI: 10.57780/esa-l2obh8i
title: 1940008

description: We propose to perform two 170 ks INTEGRAL target of opportunity (ToO) observations of a transient millisecond X-ray pulsar in outburst. To constrain the broadband spectrum we also request one 30 ks simultaneous NuSTAR and two 50 ks XMM-Newton observations. The target can be either one of the twenty-one known transient accreting millisecond X-ray pulsars (AMXPs) under going a new outburst or a newly discovered object of this class. These observations will allow us to study the broad band spectrum from hard to soft X-ray energies as well as the timing properties or eclipsing features of the source during its outburst. The spectral information will make it possible to disentangle the contributions of soft black body reflection (if any) and hard Comptonized spectral components. Moreover we may detect type-I X-ray bursts and/or for the first time also burst oscillations at high-energy (if present). The INTEGRAL NuSTAR NICER Insight-HXMT Swift and XMM-Newton observations will also allow a timing analysis to study the pulse profile time lags and pulsed spectrum and will thus provide important constraints on emission mechanisms.Similar proposals were approved for the INTEGRAL AO2-AO18 cycles and during these years our ToO has been triggered ten times: in 2003 we observed XTE J1807-294 in 2004 2005 2009 2011 and 2013 we triggered on newly discovered sources IGR J00291+5934 HETE J1900.1-2455 IGR J17511-3057 IGR J17498-2921 and IGR J18245-2452 respectively. In 2015 we triggered on IGR J00291+5934 and SAX J1748.9-2021 and in 2018 we triggered again on a newly discovered source IGR J17591-2342 and Swift J1756.9-2508. [truncated! Please see actual data for full text]
DOI: 10.57780/esa-l3cz1xd
title: 0620062

description: The discovery of persistent hard X-ray emission from anomalous X-ray pulsars (AXPs) is one of the most remarkable discoveries by INTEGRAL to date! The spectral-shape transition of these AXPs around ~10 keV is drastic and not understood: from soft to extremely hard. These AXPs are detected up to at least 150 keV and their non-thermal emissions contain the bulk of the total energy emitted.These remarkable AXP spectra have led to several theoretical attempts to explain the non-thermal hard X-ray emission using e.g. magnetar corona and/or exotic QED processes in the most extreme magnetic fields. The current measurements are inssufficient to distinguish between several physically very different models. Using all available INTEGRAL archival data on these sources we collected good statistics on their time-averaged (years)n spectra and pulse profiles. However we know from the soft X-ray NIR and even radio bands that AXPs show dramatic variability behaviour in a wide variety of forms. What causes these dramatic events and how variations in one energy range relate to another is still a major puzzle in AXP astrophysics and is clearly intimately connected to determining the origin of AXP emission across the spectrum.We propose an INTEGRAL ToO program to follow up any (known or new) AXP not detected by INTEGRAL which shows significant increase in the persistent flux in soft X-rays (2-10 keV) till above 2E-11 erg cm-2 s-1. This can be easily measured with RXTE with which the AXPs are regularly monitored.We ask for 800 ks to determine accurately changes in parameters. To optimize the available INTEGRAL time we ask for the first 400 ks observation followed by near-real-time analysis searching for evidence fo the expected changes. After justification to the Proj. Scientist we request the remaining 400 ks. [truncated! Please see actual data for full text]
DOI: 10.57780/esa-l4i9wfb
title: 1720007

description: We propose to continue the INTEGRAL-multiwavelengh 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 the new facilities we included in the past AOs (the Sardinia radio telescope NICER and HXMT in the X-rays). We will also include infrared/optical (ESO) through  dedicated proposals.  We require 45 ks pointings taken every second revolution in order to 1) probe the physics of accretion by studying the 0.5--500 keV emission of the source 2) study the origin of the high variability of GRS 1915+105 3) understand the connections between accretion and ejection processes and 4) constrain physical models of emission processes through broad band spectral and temporal analysis. Points 1) and 2) can be done by looking into the interplay between the soft and hard X-ray emitters (therefore with Swift/XRT NICER JEM-X and IBIS+ HXMT) point 3) and 4) needs contemporaneous broad band coverages and timing studies (with NICER and HXMT). Besides these specific points this monitoring will allow us to accumulate more data and thus have a better view of the (rather unknown) behaviour of this source beyond 200 keV.  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-l5hxham
title: 8860307

description: OMC FF sequence ISOC V10 onwards: sequence of ff measurements with LED on/off followed by a DC cal.
DOI: 10.57780/esa-l6s4my1
title: 8860233

description: OMC FF sequence ISOC V10 onwards: sequence of ff measurements with LED on/off followed by a DC cal.