GCN Circular 5214
Subject
GRB 060604: BAT refined analysis
Date
2006-06-05T01:50:02Z (18 years ago)
From
Jay R. Cummings at NASA/GSFC/Swift <jayc@milkyway.gsfc.nasa.gov>
A. Parsons (GSFC), L. Barbier (GSFC), S. Barthelmy (GSFC),
J. Cummings (GSFC/ORAU), E. Fenimore (LANL), N. Gehrels (GSFC),
D. Hullinger (BYU-Idaho), H. Krimm (GSFC/USRA), M. Koss (GSFC/UMD),
C. Markwardt (GSFC/UMD), D. Palmer (LANL), T. Sakamoto (GSFC/ORAU),
G. Sato (GSFC/JSPS/USRA), M. Stamatikos (GSFC/ORAU),
J. Tueller (GSFC), on behalf of the Swift-BAT team:
Using the data set from T-119.2 to T+182.9 sec from the recent telemetry
downlink, we report further analysis of BAT GRB 060604 (trigger #213486)
(Page, et al., GCN 5212). The BAT ground-calculated position is (RA,Dec)
337.233, -10.937 deg {22h 28m 55.8s, -10d 56' 14.8"} (J2000) +- 2.9 arcmin,
(radius, sys+stat, 90% containment). The partial coding was 72%.
The burst was very weak in BAT. There was some low-level soft emission
over ~25 seconds starting at T-50, followed by the main peak at T+0.
T90 (15-350 keV) is 10 +- 3 sec (estimated error including systematics).
The time-averaged spectrum from T-1.4 to T+8.3 is best fit by a simple
power-law model. The power law index of the time-averaged spectrum is
1.90 +- 0.41. The fluence in the 15-150 keV band is
1.3 +- 0.3 x 10^-07 erg/cm2. The 1-sec peak photon flux measured from
T+2.28 sec in the 15-150 keV band is 0.6 +- 0.1 ph/cm2/sec. All the quoted
errors are at the 90% confidence level.