Swift-BAT GRB 050528: a soft burst
TITLE: GCN GRB OBSERVATION REPORT
NUMBER: 3502
SUBJECT: Swift-BAT GRB 050528: a soft burst
DATE: 05/05/28 19:48:57 GMT
FROM: Scott Barthelmy at NASA/GSFC
J. Cummings (GSFC/NRC), L. Barbier, S. Barthelmy (GSFC), E. Fenimore (LANL), N. Gehrels (GSFC), D. Hullinger (GSFC/UMD), H. Krimm (GSFC/USRA), C. Markwardt, (GSFC/UMD), D. Palmer (LANL), A. Parsons (GSFC), T. Sakamoto (GSFC), G. Sato (ISAS), M. Suzuki (Saitama), T. Takahashi (ISAS), J. Tueller (GSFC) on behalf of the Swift-BAT team:
The full data set has been delivered (GCN 3501). Analysis of the data has allowed us to determine that Trigger 130649 at 04:06:45 UT (GCN 3496) is a real GRB. The ground-analysis position is RA,Dec 353.515,+45.938 (J2000) with an uncertainty of 3 arcmin (radius, 90%, statistical plus systematic).
The lightcuve shows a single smooth peak lasting ~12 sec with an ~1-sec spike riding on top towards the end of the event. It starts ~T-8 and ends at T+4 sec. T90 is 10.8 sec.
The burst spectrum is consistant with a simple power-law with a photon index of 2.44 +-0.25 and a flux of 11.8 +-0.1 ph/cm2/sec (15-350 keV, 90% c.l.). This is a very soft event with essentially no emission above 100 keV. The fluence is (5.1+-0.1)x10^-7 ergs/cm2 (15-350 keV, 90% c.l.).
