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 17406

GRB 150204A BAT refined analysis
2015-02-04T19:53:28Z (9 years ago)
Jay R. Cummings at NASA/GSFC/Swift <>
M. Stamatikos (OSU), C. B. Markwardt (GSFC), S. D. Barthelmy (GSFC),
W. H. Baumgartner (GSFC/UMBC), J. R. Cummings (, N. Gehrels (GSFC),
H. A. Krimm (GSFC/USRA), A. Y. Lien (GSFC/UMBC), D. M. Palmer (LANL),
T. Sakamoto (AGU),  J. Tueller (GSFC),
T. N. Ukwatta (LANL) (i.e. the Swift-BAT team):

We report further analysis of GRB 150204A.  The best BAT position is the same
as reported earlier (Cummings, GCN # 17404), RA, Dec 160.241, -64.043, which is:

RA (J2000)   10h 40m 57.8s
Dec (J2000) -64d 02' 34"

with an estimated 90% uncertainty radius of 1.5 arcmin.  The source was 77% coded
at the time of the burst.

The burst was a single symmetric cusp.  T90 was 12 +- 2 seconds.

A simple powerlaw function is the best fit to the BAT spectrum.  The photon index
is 1.62 +- 0.10.  The fluence from 15 to 150 keV in 13 seconds was
(8.0 +- 0.4) x 10^-7 ergs/cm^2.  The 1-second peak flux in this energy range was
1.85 +- 0.12 photons/cm^2.  All uncertainties are 90% confidence.

A Swift TOO has been approved.
Looking for U.S. government information and services? Visit