GCN Circular 895
Subject
IPN triangulation of GRB001204 (short/hard)
Date
2000-12-07T01:19:49Z (24 years ago)
From
Kevin Hurley at UCBerkeley/SSL <khurley@sunspot.ssl.berkeley.edu>
K. Hurley, on behalf of the Ulysses GRB team, T. Cline, on behalf of
the Konus-Wind and NEAR GRB teams, F. Frontera, C. Guidorzi, and E.
Montanari, on behalf of the BeppoSAX GRBM team, and E. Mazets and S.
Golenetskii, on behalf of the KONUS-WIND GRB team, report:
Ulysses and NEAR have only recently emerged from an intense solar
proton event lasting approximately two weeks. Ulysses, NEAR, BeppoSAX
GRBM, and KONUS-WIND observed this GRB at 28869 seconds. Its spectrum
and duration place it firmly in the "short/hard" class of gamma-ray
bursts. As observed by Ulysses, it had a duration of
<0.5 seconds, a 25-100 keV fluence of approximately 3.7E-7 erg/cm2,
and a peak flux of approximately 6.8E-7 erg/cm2 s over 0.5 seconds.
We have triangulated it to a preliminary, 3 sigma error box with approximate area 18 square arcminutes, whose coordinates are:
ERROR BOX CENTER: 2 h 41 m 8.59 s 12 o 53 ' 46.31 "
ERROR BOX CORNER 1: 2 h 41 m 10.35 s 12 o 51 ' 56.95 "
ERROR BOX CORNER 2: 2 h 40 m 50.39 s 12 o 51 ' 35.60 "
ERROR BOX CORNER 3: 2 h 41 m 26.79 s 12 o 55 ' 57.13 "
ERROR BOX CORNER 4: 2 h 41 m 6.83 s 12 o 55 ' 35.67 "
Because solar protons were still being recorded by Ulysses,
this burst was detected at slightly under 5 sigma significance
(statistical only), making it somewhat marginal. However,
final consistency checks are now being carried out, and the
results will be communicated as soon as they are available.