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 3525

GRB050607: Swift Detection of a long GRB
2005-06-07T12:07:33Z (19 years ago)
Alon Retter at PSU <>
A. Retter, J. Racusin, J. Kennea, D. Burrows (PSU), D. Palmer (LANL),
K. McGowan (MSSL), J. Cummings (NRC/GSFC), S. Barthelmy, N. Gehrels

on behalf of the Swift Team report:

At 09:11:23 UT the Swift-BAT triggered on GRB 050607 (trigger 132247).
The BAT refined ground position is RA, Dec 300.167, +9.137 (J2000)
{20h00m40s, +09d 08' 13"}.  The burst had 3 peaks over 30 seconds, with a
T90 of 26.5 seconds from T+0 to T+26.5 seconds. Its spectrum is well fit
by a simple power law with an index of 1.93 +/- 0.14.  The total fluence
was (8.9 +/- 1.2) x 10^-7 erg/cm2 over 15-350 keV. The peak flux was
1.15+/-0.16 photons/cm2/s from T+1 to T+2 seconds. The burst was 27
degrees off the BAT boresight in the 87% coded field of view. Swift slewed
to the position of the burst immediately, starting 17 seconds after the
burst trigger.

The XRT was pointed promptly at the burst at 09:13:02 UT (100 s after the
BAT burst trigger).  The XRT did not centroid on-board, but ground
analysis revealed a bright X-ray source near the center of the field of
view, with position RA(J2000) = 20h 00m 42.5s Dec(J2000) = +09d 08' 30''
We estimate an uncertainty of approximately 8 arcseconds radius (90%
containment).  This position is 40 arcseconds from the BAT position.

Immediate data from UVOT will not be available due to the instrument
being in an engineering mode.
Looking for U.S. government information and services? Visit