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 21156

GRB 170526A, Swift-BAT refined analysis
2017-05-27T18:52:59Z (7 years ago)
Amy Lien at GSFC <>
C. B. Markwardt (GSFC), S. D. Barthelmy (GSFC),
J. R. Cummings (CPI), H. A. Krimm (NSF/USRA),
A. Y. Lien (GSFC/UMBC), D. M. Palmer (LANL),
T. Sakamoto (AGU), B. Sbarufatti (INAF-OAB/PSU),
M. Stamatikos (OSU), T. N. Ukwatta (LANL)
(i.e. the Swift-BAT team):

Using the data set from T-327 to T+1275 sec from the recent telemetry downlink,
we report further analysis of BAT GRB 170526A (trigger #754549)
(Sbarufatti et al., GCN Circ. 21149).  The BAT ground-calculated position is
RA, Dec = 4.723, 1.277 deg which is
  RA(J2000)  =  00h 18m 53.6s
  Dec(J2000) = +01d 16' 35.7"
with an uncertainty of 2.4 arcmin, (radius, sys+stat, 90% containment).
The partial coding was 94%.

The mask-weighted light curve shows a weak pulse structure that starts
at ~T0, peaks at ~ T+1 s, and ends at ~ T+10 s. T90 (15-350 keV) is 7.9 +- 1.6 sec
(estimated error including systematics).

The time-averaged spectrum from T+1.1 to T+10.0 sec is best fit by a simple
power-law model.  The power law index of the time-averaged spectrum is
1.25 +- 0.42.  The fluence in the 15-150 keV band is 1.6 +- 0.4 x 10^-7 erg/cm2.
The 1-sec peak photon flux measured from T+1.10 sec in the 15-150 keV band
is 0.3 +- 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