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 23780

GRB 190123A: Swift-BAT refined analysis
2019-01-24T12:20:11Z (5 years ago)
Hans Krimm at NSF/NASA-GSFC <>
A. Y. Lien (GSFC/UMBC), S. D. Barthelmy (GSFC),  J. R. Cummings (CPI),
A. D'Ai (INAF-IASFPA), H. A. Krimm (NSF/USRA), C. B. Markwardt (GSFC),
D. M. Palmer (LANL), T. Sakamoto (AGU), 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 190123A (trigger #885314)
(D'Ai, et al., GCN Circ. 23769).  The BAT ground-calculated position is
RA, Dec = 53.175, 45.505 deg, which is
   RA(J2000)  =  03h 32m 42.0s
   Dec(J2000) = +45d 30' 16.3"
with an uncertainty of 1.7 arcmin, (radius, sys+stat, 90% containment).
The partial coding was 64%.

The mask-weighted light curve shows a single FRED-shaped peak from about
T-5 to T+20 sec, with a peak around T+3 sec.   Observations were discontinued
due to an observing constraint at ~T+325 sec.  T90 (15-350 keV) is
24.4 +- 4.3 sec (estimated error including systematics).

The time-averaged spectrum from T-1.22 to T+28.06 sec is best fit by a simple
power-law model.  The power law index of the time-averaged spectrum is
1.13 +- 0.23.  The fluence in the 15-150 keV band is 8.4 +- 1.1 x 10^-7 erg/cm2.
The 1-sec peak photon flux measured from T+4.82 sec in the 15-150 keV band
is 1.0 +- 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