Skip to main content
Introducing Einstein Probe, Astro Flavored Markdown, and Notices Schema v4.0.0. See news and announcements

GCN Circular 4443

GRB060108: Swift detection of its 100th GRB
2006-01-08T15:11:49Z (18 years ago)
Hans Krimm at NASA-GSFC <>
S. Oates (UCL-MSSL),  D. Burrows (PSU), M. De Pasquale (UCL-MSSL),
N. Gehrels (GSFC),  J. Kennea (PSU), H. Krimm (GSFC/USRA),
K. Page (U. Leicester), F. Marshall (GSFC),  S.T.  Holland (GSFC/USRA),
D. Palmer (LANL), A. Parsons (GSFC)
report on behalf of the Swift team:

At 14:39:11.76 UT, Swift-BAT triggered and located GRB060108
(trigger=176453). The spacecraft slewed immediately.
The BAT on-board calculated location is RA,Dec 146.992d, +31.916d
{09h 47m 58s, +31d 54' 59"} (J2000), with an uncertainty of 3 arcmin
(radius, 90% containment, stat+sys). The BAT light curve showed a
single peak structure with a FRED time profile and a total duration of
~20 sec. The peak count rate was ~2000 counts/sec (15-350 keV),
at ~4 seconds after the trigger.

XRT started observing the field at 14:40:43 UT, 91 seconds after the BAT
trigger. Although no source was found by the on-board algorithm, the raw
X-ray light-curve implies there is a fading source in the field of view.
However, we will have to wait for the Malindi data to determine the
position of this source.

UVOT took a finding chart exposure of 200 seconds with the V filter
starting 91 seconds after the BAT trigger. No afterglow candidate has
been found in the initial data products. The 2.7'x2.7' sub-image covers
19% of the BAT error circle. The 3-sigma upper limit is 18.3 mag.
The 8'x8' region for the list of sources generated on-board covers
87% of the BAT error circle. The list of sources is typically complete
to about 18.0 mag. No correction has been made for
the expected visual extinction of about 0.1 magnitudes.
Looking for U.S. government information and services? Visit