# Presentation: 516431

## The HEASARC Archive and Web Services

## System Upgrades

- Transition of HEASARC Web site and database machines to Linux
- Web services: October 2002
- Primary database server: December 2002
- Backup server still running on Digital Unix
- Load balancing
- Modifications required for all web pages which saved state

## System configuration

- Big IP
- (HEASARC)

- HEASARC1

- HEASARC2

- Additional machines may be added transparently

- User

- Services that create state on the server side need to ensure that a single machine is called consistently.

## Issues with transition

- Few problems encountered on roll-out
- Recent concerns with security scan crashing system
- Problems with Server-side Java (used in Browse server side plotting)
- Sybase in Linux not easily synchronized with backup database

## System upgradess planned

- Replacement of Archive storage with faster (> 3x), larger (10 TB) system.
- Cost ~$150K including first year maintenance.
- Support archive volume through FY06.
- Backup archive in separate building.
- Use old archive store and backup (total of ~6 TB).
- Location in Building 6 or trailer.
- No current plans for on-line, fully offsite backup.

## Web Accessibility Guidelines

- Mandated response to ADA
- Federal December 21 deadline met at ~99% level.
- HEASARC personnel reviewed all LHEA websites (37 distinct servers)
- Continual monitoring to ensure compliance.
- Non-compliant sites may be shut down.

## Web maintainance

- Currently only about 10 page missing (404) and server invalid (602) errors each unresolved
- Continued vigilance needed to assure  this very low level of broken links (in a site with > 10K pages).

## Browse Highlights

- Excel-compatible output
- Handling of complex RXTE data products
- Bibliography links
- Full integration of remote data products in tar files (especially Chandra)
- Name resolver consistency checking
- Links to Hera
- VOTable output

## Mission Usage In Browse

## Browse Usage Trends

## GRBCAT – Master list of GRBs

- Data from three decades
- Built by N. Gehrels, B. Mattson, L.Angelini & K. Hurley
- Manual entry of most data from a variety of sources
- 4677 distinct entries.
- Time,  Duration, Flux,  Fluence, Position and/or region
- Beta version put on-line 30 July 2002
- Will add missing missions (HETE-2, BeppoSAX) and make easily queryable by Swift launch

## GRBCAT on the WEB 

- Beta version: http:://grbcat.gsfc.nasa.gov

## SkyView highlights and plans

- Scientific American top 50 web site (also recently featured in Wired)
- SHASSA and SFD Dust maps surveys
- SUMSS survey major update
- Further integration with SkyMorph moving target searches
- Awaiting new 2MASS and SDSS releases with interest!
- Java implementation of *SkyView* to be released in Spring.

## SkyView Usage

## Sky Popularity

- Logarithmic plot of the density of *SkyView* requests on the sky (about 3 million requests total)

## VO Activities

- ADEC ITWG
- NSF VO Inititiative
- Integration of these efforts is one of the goals of HEASARC participation in ADEC white paper.

## ITWG

- Standardized delivery of bibliography data to ADS
- HEASARC Preview query
- Test Browse with links to MAST and ADS
- Dataset ID verification service

## NSF NVO Protocols

- VOTable compatibility for Browse
- Cone search service integration for Browse
- Catalog query for a given position in the sky.
- Simple image access service interface for *SkyView*
- What images are available from a given service in some region.

## GRB Demo

- Provide rapid response information about a given region in the sky.
- Use standard VO protocols to query services.
- Cache results for rapid access by many users.
- Use VOTable common formats to initiate multiple user analysis/viewing tools (currently Aladin[CDS] and OASIS[IRSA])

## GRB Demo

- The demo organizes all of the data that is available for the given region for the user. For links to target or observation tables, the number of targets or observations is given.

## GRB Demo

- One goal of the demo was to show how we could go into multiple analysis environments easily, since the data results were in a common format.  Here we’ve started the OASIS environment with a number tables and images.

## GRB Demo Continued

- Successfully demonstrated at January AAS.
- Interface with GCN to automatically collect information on bursts
- Provide generic region service to replace/subsume existing Astrobrowse system
- Work with Swift team to provide followup information on Swift bursts