GCN Circular 13360
Subject
GRB 120612A: Swift-BAT refined analysis
Date
2012-06-12T12:28:06Z (12 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), E. E. Fenimore (LANL), N. Gehrels (GSFC),
H. A. Krimm (GSFC/USRA), C. B. Markwardt (GSFC), C. Pagani (U Leicester),
T. Sakamoto (GSFC/UMBC), G. Sato (ISAS), M. Stamatikos (OSU),
J. Tueller (GSFC), T. N. Ukwatta (MSU)
(i.e. the Swift-BAT team):
Using the data set from T-239 to T+963 sec from recent telemetry downlinks,
we report further analysis of BAT GRB 120612A (trigger #524128)
(Pagani, et al., GCN Circ. 13357). The BAT ground-calculated position is
RA, Dec = 126.723, -17.598 deg which is
RA(J2000) = 08h 26m 53.5s
Dec(J2000) = -17d 35' 52.9"
with an uncertainty of 1.7 arcmin, (radius, sys+stat, 90% containment).
The partial coding was 67%.
The mask-weighted light curve shows a broad peak starting at ~T+15 sec,
peaking at roughtly T+35 sec, and ending around T+150 sec with a long
low-level tail out to about T+380 sec. T90 (15-350 keV) is 90 +- 14 sec
(estimated error including systematics).
The time-averaged spectrum from T+16.9 to T+125.4 sec is best fit by a simple
power-law model. The power law index of the time-averaged spectrum is
1.36 +- 0.16. The fluence in the 15-150 keV band is 1.3 +- 0.1 x 10^-6 erg/cm2.
The 1-sec peak photon flux measured from T+30.20 sec in the 15-150 keV band
is 0.5 +- 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/524128/BA/