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 14624

GRB 130511A, Swift-BAT refined analysis
2013-05-11T21:27:10Z (11 years ago)
Hans Krimm at NASA-GSFC <>
M. Stamatikos (OSU), S. D. Barthelmy (GSFC), W. H. Baumgartner (GSFC/UMBC),
J. R. Cummings (GSFC/UMBC), N. Gehrels (GSFC), H. A. Krimm (GSFC/USRA),
A. Y. Lien (NASA/GSFC/ORAU), C. B. Markwardt (GSFC), D. M. Palmer (LANL),
T. Sakamoto (AGU),T. N. Ukwatta (MSU)
(i.e. the Swift-BAT team):

Using the data set from T-240 to T+950 sec from the recent telemetry downlink,
we report further analysis of BAT GRB 130511A (trigger #555600)
(Krimm, et al., GCN Circ. 14620).  The BAT ground-calculated position is
RA, Dec = 196.654, 18.709 deg which is
    RA(J2000)  =  13h 06m 36.9s
    Dec(J2000) = +18d 42' 33.7"
with an uncertainty of 2.3 arcmin, (radius, sys+stat, 90% containment).
The partial coding was 57%.

The mask-weighted light curve shows an initial sharp double-peak at T0
of duration ~0.5 seconds, transitioning to a FRED-like decay lasting ~5
seconds, after which the light curve returns to baseline.
T90 (15-350 keV) is 5.43 +- 2.22 sec (estimated error including systematics).

The time-averaged spectrum from T-0.07 to T+6.03 sec is best fit by a simple
power-law model.  The power law index of the time-averaged spectrum is
1.35 +- 0.31.  The fluence in the 15-150 keV band is 2.2 +- 0.4 x 10^-07 erg/cm2.
The 1-sec peak photon flux measured from T-0.09 sec in the 15-150 keV band
is 1.3 +- 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