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    New GRB 02/16/10


    Posts : 58
    Join date : 2010-02-17

    New GRB 02/16/10

    Post  mountaingirl/NM on Fri 19 Feb 2010, 1:15 am


    NUMBER: 10428
    SUBJECT: GRB 100216A Short, hard GRB detected in ground analysis of Swift-BAT data
    DATE: 10/02/19 00:32:34 GMT
    FROM: Jay R. Cummings at NASA/GSFC/Swift <>

    J. R. Cummings (NASA/GSFC/CRESST), S. D. Barthelmy (GSFC), D. B. Fox (PSU),
    N. Gehrels (GSFC), H. A. Krimm (GSFC/USRA), and D. M. Palmer (LANL)
    report on behalf of the Swift team:

    At 10:07:00 UT, Swift-BAT detected GRB 100216A as a rate peak (trigger#
    412522), but no source was found onboard. A source was detected in
    ground analysis at RA, Dec 154.263, +35.524, which is

    RA (J2000) 10h 17m 03.2s
    Dec (J2000) +35d 31' 27.5"

    with an estimated 90% containment of 3 arcmin. The source was detected
    at a significance of 6.8 sigma in the ground analysis. This level
    ordinarily indicates a real source, but may have been reached by chance
    a few times in the past in similar BAT images. The maskweighted and raw
    lightcurves, however, do appear to be consistent with this location being
    the source of the burst. This position was 41% coded in BAT. This burst
    was also detected by Fermi GBM (trigger 288007622) at a best ground-
    analysis position of RA, Dec: 166.9, 56.6 with an estimated uncertainty
    of 6.6 degrees (Gruber, private communication). The entire GBM error
    circle was in a highly-coded region of the BAT FOV, and no credible peak
    was found any closer to the GBM position.

    The burst as seen by BAT consisted of a single peak lasting 0.3 seconds.
    The power-law index of the spectrum was 0.6 +/- 0.3. The fluence in the
    interval 15-350 keV was (4.7 +- 3) x 10^-8 erg/cm2.

    There was no automated followup because the source was not detected
    onboard. The detailed data on the burst was not available until two days
    after the burst. We note that there is a bright (g'=17.2 mag),
    DSS-resolved galaxy, KUG 1014+357 (aka LEDA 86918, aka
    SDSS J101700.25+353118.9) at redshift z = 0.038, within the BAT
    localization region. Given the possibility of a low-redshift origin for
    this event, and although detectable X-ray emission from short bursts
    rarely lasts so long, a limited Swift TOO campaign has been requested
    and approved.


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