Skip to main content
Testing. You are viewing the public testing version of GCN. For the production version, go to
New Announcement Feature, Code of Conduct, Circular Revisions. See news and announcements

GCN Circular 15996

GRB 140318A: Swift-BAT refined analysis
2014-03-18T23:58:07Z (10 years ago)
Amy Lien at GSFC <>
C. B. Markwardt (GSFC), S. D. Barthelmy (GSFC), W. H. Baumgartner (GSFC/UMBC),
S. B. Cenko (GSFC), J. R. Cummings (GSFC/UMBC), N. Gehrels (GSFC),
H. A. Krimm (GSFC/USRA), A. Y. Lien (NASA/UMBC), D. M. Palmer (LANL),
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-240 to T+962 sec from the recent telemetry downlink,
we report further analysis of BAT GRB 140318A (trigger #592204)
(Cenko, et al., GCN Circ. 15986).  The BAT ground-calculated position is
RA, Dec = 184.049, 20.225 deg which is
  RA(J2000)  =  12h 16m 11.8s
  Dec(J2000) = +20d 13' 30.8"
with an uncertainty of 2.1 arcmin, (radius, sys+stat, 90% containment).
The partial coding was 49%.

The mask-weighted light curve shows a main single pulse starts at ~T+2 s and
ends at ~T+12 s, with some weak extented emissions starting before the main pulse
at ~T-20 s and extended after the pulse to ~T+50 s. T90 (15-350 keV) is 8.43 +- 1.27 sec
(estimated error including systematics).

The time-averaged spectrum from T+2.24 to T+11.68 sec is best fit by a simple
power-law model.  The power law index of the time-averaged spectrum is
1.35 +- 0.28.  The fluence in the 15-150 keV band is 2.9 +- 0.5 x 10^-7 erg/cm2.
The 1-sec peak photon flux measured from T+5.48 sec in the 15-150 keV band
is 0.5 +- 0.2 ph/cm2/sec.  All the quoted errors are at the 90% confidence

The results of the batgrbproduct analysis are available at
Looking for U.S. government information and services? Visit