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Swift data archive


2 AO cycles (analysis of Swift data, follow-up observation, theoretical investigation) ... Populate and maintain the Swift science and calibration data archive ... – PowerPoint PPT presentation

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Title: Swift data archive

Swift data archive
  • Lorella Angelini

Collaboration USA/Italy/UK
  • Multi-wavelength observatory
  • Burst Alert Telescope (BAT) 10-150 keV
  • onboard computation of positions
  • arc-minute positional accuracy
  • X-rays, UV, and optical afterglow follow up
  • 0.3-10 keV X-ray Telescope (XRT)
  • 170-650 nm UV/Optical Telescope (UVOT)
  • Launch 20 Nov 2004
  • Rapid response satellite
  • Rapid data dissemination made public immediately
  • 2 AO cycles (analysis of Swift data, follow-up
    observation, theoretical investigation)
  • Science highlights
  • Discovered and/or follow-up 151 GRBs (23 from
    different satellite)
  • Arcsec localization for short bursts Detected
    high redshift bursts
  • Detection of GRB concident with a SN2006aj
  • Discovered new phenomenology in the early
    afterglow lightcurves
  • Build up the first hard X-ray survey
  • Swift in senior review in 2006

HEASARC responsibilities
  • Populate and maintain the Swift science and
    calibration data archive
  • Provide the following services
  • Public access to the Swift archive
  • Science data analysis software environment
  • Web server for the Swift Science Support Center
  • Database system for the Swift tables
  • Long-term archive
  • Generate GRB summary products
  • These responsibilities are documented in the
  • Technical agreement via ICD in place with the
    SDC, ISAC, BAT Team for the catalog delivery

Archive general
  • Swift archive contains
  • Science and HK data
  • High level Calibration file pre-post launch
  • Software for data analysis
  • Documentation (archive, software, calibration)
  • Data are in FITS format OGIP standards
  • GIF and HTML used for products preview or to
    record processing
  • No proprietary period for data
  • But check-out (45 days) verification mission
    phase (3 months) data were available only to
    the Swift team
  • Archive co-located at HEASARC
  • Copy of the Science and HK data are sent to the
    Italian and UK data center

Archive Standards
  • HEASARC infrastructure used to ingest and
  • Science HK data databases
  • Data access via the multi-mission Web Browse and
  • Special Swift Web interface to facilitate
    searches by GRB name and sources within the BAT
  • Data are in OGIP FITS standard
  • Software part of the HEAsoft package (knows as
  • 7 releases since launch (1 every 2 months)
  • Same software is used by the SDC pipeline
  • Calibration data in the HEASARC multi-mission
    Calibration database (CALDB)
  • Updates since launch 7 BAT, 10 XRT, 8 UVOT

Swift rapid data dissemination plan
  • Data are downloaded via
  • TDRSS. Series of messages after a trigger is
    detected on board.
  • broadcast via the GCN (minutes)
  • later archived as part of the final Swift archive
    (lt a week)
  • Malindi. All the telemetry. About 6 -7 download
    per day
  • Two processing types of the Malindi data (same
    pipeline software)
  • Quick look (output data is not part of the final
  • Data processed every Malindi dump, e.g. the same
    observation is re-processed when new data arrive.
  • Data public in 3-6 hours after each dump (from
    FTP SDC).
  • Permanent archive
  • Final processing after an observation ( 1 day
    of data )
  • Archived after all telemetry for observation is
    available ( lt a week)

Data delivery Archive population
  • Archive populated from the start of the mission
  • Since 1st April data are public (end of the
    verification phase)
  • Physical archive and database system updated
  • Archive uses automated transfer and ingest
  • Transfer data DBs from the processing site
  • Ingest data into the physical archive and
    database system
  • gt ensure small dead time
  • Transfer ingest protocols used by the
    European Data centers
  • Backup done at the ingest time

Content of the Physical Archive

Archive size
Observing Time percentage (April 1 2005 Dec 31
2005) GRB 63 ToO
9 Fill-in Targets 20
Calibration 8
Section GB Seq
Obervation 1040 7701
Messages 71 66095
Trend 35 NA
  • Total volume 1146 GB
  • Average ingest 2.5 GB x day

1 Jan 2005- 31 Mar 2006
  • Production data
  • TDRSS messages (SDC) - by trigger number
  • Level 1,2,3 production data (SDC) - by
  • Monitoring Calibration data (SDC/SSC) - by
    type CALDB

Recent reprocessing
  • Data reprocessing
  • All data taken so far will be reprocessed by the
  • Latest Pipeline includes improvement implemented
    in the last year
  • New databases logging the 3 instrument
    configurations at the exposure or snapshot level
    are generated with the reprocessing
  • Current status
  • First 3 months in 2005 used to test the
  • SDC processing delivery at HEASARC for checking
  • Final version for these 3 months are ready
  • Instrument tables not quite ready
  • Other data centers currently copying the data
  • Plan is to reprocess 1 month at the time

Data downloads
  • SDC higher download during first trimester
    compared to normal operation since first
    trimester was holding more than a week of data
  • Overall HEASARC download increase with time
  • Last trimester 20 of the total HEASARC
    holdings (24 missions / 7 active)
  • Swift is among the top 3 popular missions

Downloads Demography
  • HEASARC will maintain the current level of
    activities and the current data ingest
  • Additional creation of the high level data
    products for GRB
  • New high level data databases are expected from
  • Swift GRB catalog
  • Serendipitous survey from the BAT, XRT and UVOT
  • The Swift catalog used for the HEASARC GRB name
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