{
  "bibcode": "2010GCN.10428....1C",
  "body": "J. R. Cummings (NASA/GSFC/CRESST), S. D. Barthelmy (GSFC), D. B. Fox (PSU),\nN. Gehrels (GSFC), H. A. Krimm (GSFC/USRA), and D. M. Palmer (LANL)\nreport on behalf of the Swift team:\n\nAt 10:07:00 UT, Swift-BAT detected GRB 100216A as a rate peak (trigger#\n412522), but no source was found onboard.  A source was detected in\nground analysis at RA, Dec 154.263, +35.524, which is\n\nRA (J2000)      10h 17m 03.2s\nDec (J2000)     +35d 31' 27.5\"\n\nwith an estimated 90% containment of 3 arcmin.  The source was detected\nat a significance of 6.8 sigma in the ground analysis.  This level\nordinarily indicates a real source, but may have been reached by chance\na few times in the past in similar BAT images.  The maskweighted and raw\nlightcurves, however, do appear to be consistent with this location being\nthe source of the burst.  This position was 41% coded in BAT.  This burst\nwas also detected by Fermi GBM (trigger 288007622) at a best ground-\nanalysis position of RA, Dec: 166.9, 56.6 with an estimated uncertainty\nof 6.6 degrees (Gruber, private communication).  The entire GBM error\ncircle was in a highly-coded region of the BAT FOV, and no credible peak\nwas found any closer to the GBM position.\n\nThe burst as seen by BAT consisted of a single peak lasting 0.3 seconds.\nThe power-law index of the spectrum was 0.6 +/- 0.3.  The fluence in the\ninterval 15-350 keV was (4.7 +- 3) x 10^-8 erg/cm2.\n\nThere was no automated followup because the source was not detected\nonboard.  The detailed data on the burst was not available until two days\nafter the burst.  We note that there is a bright (g'=17.2 mag),\nDSS-resolved galaxy, KUG  1014+357 (aka LEDA 86918, aka\nSDSS J101700.25+353118.9) at redshift z = 0.038, within the BAT\nlocalization region.  Given the possibility of a low-redshift origin for\nthis event, and although detectable X-ray emission from short bursts\nrarely lasts so long, a limited Swift TOO campaign has been requested\nand approved.",
  "circularId": 10428,
  "createdOn": 1266539554000,
  "email": "jayc@milkyway.gsfc.nasa.gov",
  "subject": "GRB 100216A Short, hard GRB detected in ground analysis of Swift-BAT data",
  "submitter": "Jay R. Cummings at NASA/GSFC/Swift  <jayc@milkyway.gsfc.nasa.gov>",
  "eventId": "GRB 100216A"
}