GCN Circular 17457
Subject
GRB 150212A: Swift-BAT refined analysis
Date
2015-02-12T14:28:38Z (10 years ago)
From
Scott Barthelmy at NASA/GSFC <scott@lheamail.gsfc.nasa.gov>
J. R. Cummings (GSFC/UMBC), A. Amaral-Rogers (U Leicester), S. D. Barthelmy (GSFC),
W. H. Baumgartner (GSFC/UMBC), N. Gehrels (GSFC), H. A. Krimm (GSFC/USRA),
A. Y. Lien (GSFC/UMBC), C. B. Markwardt (GSFC), D. M. Palmer (LANL),
T. Sakamoto (AGU), M. Stamatikos (OSU), J. Tueller (GSFC), T. N. Ukwatta (LANL)
(i.e. the Swift-BAT team):
Using the data set from T-60 to T+243 sec from recent telemetry downlinks,
we report further analysis of BAT GRB 150212A (trigger #630876)
(Page, et al., GCN Circ. 17449). The BAT ground-calculated position is
RA, Dec = 285.497, 47.389 deg, which is
RA(J2000) = 19h 01m 59.2s
Dec(J2000) = +47d 23' 19.1"
with an uncertainty of 1.2 arcmin, (radius, sys+stat, 90% containment).
The partial coding was 71%.
The mask-weighted light curve is FRED peak starting at ~T-1 sec, peaking
at ~T+1 sec, and ending at ~T+25 sec. T90 (15-350 keV) is 11.4 +- 4.1 sec
(estimated error including systematics).
The time-averaged spectrum from T-0.20 to T+19.66 sec is best fit by a simple
power-law model. The power law index of the time-averaged spectrum is
1.50 +- 0.11. The fluence in the 15-150 keV band is 8.9 +- 0.6 x 10^-7 erg/cm2.
The 1-sec peak photon flux measured from T+0.82 sec in the 15-150 keV band
is 1.9 +- 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/630876/BA/