GCN Circular 14925
Subject
GRB 130625A: Swift-BAT refined analysis
Date
2013-06-25T12:03:54Z (11 years ago)
From
Scott Barthelmy at NASA/GSFC <scott@lheamail.gsfc.nasa.gov>
D. M. Palmer (LANL), S. D. Barthelmy (GSFC), W. H. Baumgartner (GSFC/UMBC),
J. R. Cummings (GSFC/UMBC), N. Gehrels (GSFC), D. Grupe (PSU),
H. A. Krimm (GSFC/USRA), A. Y. Lien (NASA/GSFC/ORAU), C. B. Markwardt (GSFC),
T. Sakamoto (AGU), M. Stamatikos (OSU), J. Tueller (GSFC),
T. N. Ukwatta (MSU) (i.e. the Swift-BAT team):
Using the data set from T-60 to T+243 sec from the recent telemetry downlink,
we report further analysis of BAT GRB 130625A (trigger #558982)
(Grupe, et al., GCN Circ. 14923). The BAT ground-calculated position is
RA, Dec = 343.336, 82.171 deg, which is
RA(J2000) = 22h 53m 20.6s
Dec(J2000) = +82d 10' 17.1"
with an uncertainty of 1.3 arcmin, (radius, sys+stat, 90% containment).
The partial coding was 75%.
The mask-weighted light curve shows two overlapping peaks starting at ~T-25sec,
peaking at ~T+3 sec, and ending at ~T+60 sec. T90 (15-350 keV) is
38.1 +- 4.9 sec (estimated error including systematics).
The time-averaged spectrum from T-28.17 to T+18.50 sec is best fit by a simple
power-law model. The power law index of the time-averaged spectrum is
1.37 +- 0.09. The fluence in the 15-150 keV band is 1.8 +- 0.1 x 10^-6 erg/cm2.
The 1-sec peak photon flux measured from T+2.54 sec in the 15-150 keV band
is 1.2 +- 0.2 ph/cm2/sec. All the quoted errors are at the 90% confidence
level.
The results of the batgrbproduct analysis are available at
http://gcn.gsfc.nasa.gov/notices_s/558982/BA/