[vsnet-grb-info 21575] GRB 190110A, Swift-BAT refined analysis

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  23674
SUBJECT: GRB 190110A, Swift-BAT refined analysis
DATE:    19/01/11 20:23:05 GMT
FROM:    Amy Lien at GSFC  <amy.y.lien at nasa.gov>

T. N. Ukwatta (LANL), S. D. Barthelmy (GSFC),
J. R. Cummings (CPI), H. A. Krimm (NSF/USRA),
A. Y. Lien (GSFC/UMBC), C. B. Markwardt (GSFC),
D. M. Palmer (LANL), T. Sakamoto (AGU),
B. Sbarufatti (PSU), M. Stamatikos (OSU)
(i.e. the Swift-BAT team):

Using the data set from T-240 to T+180 sec from the recent telemetry downlink,
we report further analysis of BAT GRB 190110A (trigger #883012)
(Sbarufatti et al., GCN Circ. 23670).  The BAT ground-calculated position is
RA, Dec = 276.939, -53.643 deg which is
  RA(J2000)  =  18h 27m 45.3s
  Dec(J2000) = -53d 38' 34.3"
with an uncertainty of 1.0 arcmin, (radius, sys+stat, 90% containment).
The partial coding was 43%.

The mask-weighted light curve shows several overlapping peaks that starts at
~ T-1 s and ends at ~ T+11 s. The main peak occurs at ~T+5 s. T90 (15-350 keV)
is 9.3 +- 0.8 sec (estimated error including systematics).

The time-averaged spectrum from T-0.8 to T+11.0 sec is best fit by a simple
power-law model.  The power law index of the time-averaged spectrum is
1.66 +- 0.07.  The fluence in the 15-150 keV band is 2.5 +- 0.1 x 10^-6 erg/cm2.
The 1-sec peak photon flux measured from T+4.66 sec in the 15-150 keV band
is 9.0 +- 0.5 ph/cm2/sec.  All the quoted errors are at the 90% confidence
level.

The results of the batgrbproduct analysis are available at
http://gcn.gsfc.nasa.gov/notices_s/883012/BA/