[vsnet-grb-info 9983] GRB 101204A detected in ground analysis of BAT data

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  11440
SUBJECT: GRB  101204A detected in ground analysis of BAT data
DATE:    10/12/06 02:55:20 GMT
FROM:    Jay R. Cummings at NASA/GSFC/Swift  <james.r.cummings at nasa.gov>

J. R. Cummings (GSFC/UMBC/CRESST) on behalf of the Swift-BAT team

At 23:53:29 UTC on December 4, 2010 Swift-BAT detected GRB 101204A (BAT
trigger # 439806).  No source was detected onboard. An automated script
on the ground detected a source at RA, Dec 167.548, -20.434, which is

RA (J2000)    11h 10m 11.6s
Dec (J2000)  -20d 26m 04s

The source was 3.5% coded.

As seen by BAT, the burst was a single gradual pulse about 10 seconds
long. In the 10-second interval for which we have detailed event data,
which covers almost all of the burst, the spectrum is best fitted by
a simple power law with a photon index of 1.3 +- 0.2.  The fluence from
15 to 150 keV was 1.2 +- 0.4 x 10^-6 erg/cm^2.  The spectrum may be
slightly distorted by edge of FOV effects, tending to reduce the number
of lower-energy photons detected relative to higher-energy photons.

A Swift TOO has been requested.