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 19397

GRB 160506A: Swift-BAT refined analysis
2016-05-06T14:29:56Z (8 years ago)
Hans Krimm at NASA-GSFC <>
T. Sakamoto (AGU), S. D. Barthelmy (GSFC),  J. R. Cummings (GSFC/UMBC),
N. Gehrels (GSFC), L. M. Z. Hagen (PSU), H. A. Krimm (GSFC/USRA),
A. Y. Lien (GSFC/UMBC), C. B. Markwardt (GSFC), D. M. Palmer (LANL),
M. Stamatikos (OSU), T. N. Ukwatta (LANL) (i.e. the Swift-BAT team):

Using the data set from T-239 to T+963 sec from the recent telemetry downlink,
we report further analysis of BAT GRB 160506A (trigger #685245)
(Hagen, et al., GCN Circ. 19394).  The BAT ground-calculated position is
RA, Dec = 265.857, -46.127 deg which is
    RA(J2000)  =  17h 43m 25.6s
    Dec(J2000) = -46d 07' 36.1"
with an uncertainty of 1.6 arcmin, (radius, sys+stat, 90% containment).
The partial coding was 100%.

The mask-weighted light curve shows a long and complex structure.  The emission 
starts at T-10 sec, and continues with multiple peaks out to about T+275 sec.
The highest count rate is at T+100 sec.  The peaks after the slew ended at 
T+94.8 sec are also seen as flares in the XRT.  T90 (15-350 keV) is 254.5 +- 
24.9 sec (estimated error including systematics).

The time-averaged spectrum from T-8.33 to T+267.03 sec is best fit by a simple
power-law model.  The power law index of the time-averaged spectrum is
2.09 +- 0.21.  The fluence in the 15-150 keV band is 1.5 +- 0.2 x 10^-6 erg/cm2.
The 1-sec peak photon flux measured from T+98.80 sec in the 15-150 keV band
is 0.4 +- 0.3 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