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 26167

GRB 191101A: Swift-BAT refined analysis
2019-11-04T21:44:54Z (5 years ago)
Hans Krimm at NSF/NASA-GSFC <>
M. Stamatikos (OSU), S. D. Barthelmy (GSFC),  A. D'Ai (INAF-IASFPA),
H. A. Krimm (NSF), S. Laha (GSFC/UMBC), A. Y. Lien (GSFC/UMBC),
C. B. Markwardt (GSFC), D. M. Palmer (LANL), T. Sakamoto (AGU),
T. N. Ukwatta (LANL) (i.e. the Swift-BAT team):

Using the data set from T-60 to T+243 sec from the recent telemetry downlink,
we report further analysis of BAT GRB 191101A (trigger #932742)
(D'Ai, et al., GCN Circ. 26135).  The BAT ground-calculated position is
RA, Dec = 251.845, 43.740 deg which is 
  RA(J2000)  =  16h 47m 22.8s 
  Dec(J2000) = +43d 44' 24.5" 
with an uncertainty of 1.7 arcmin, (radius, sys+stat, 90% containment).
The partial coding was 47%.

The mask-weighted light curve shows a single, rather weak pulse, extending from
~T-20 sec, peaking at T+0 sec, dropping sharply at T+25 sec, followed by low-level
extended emission out to ~T+140 sec.  T90 (15-350 keV) is 137.95 +- 22.83 sec 
(estimated error including systematics).

The time-averaged spectrum from T-20.97 to T+143.53 sec is best fit by a simple
power-law model.  The power law index of the time-averaged spectrum is
1.78 +- 0.18.  The fluence in the 15-150 keV band is 1.9 +- 0.2 x 10^-6 erg/cm2.
The 1-sec peak photon flux measured from T-1.00 sec in the 15-150 keV band
is 1.3 +- 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