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 6036

GRB 070125: UVOT Observations of a Fading Optical Afterglow
2007-01-26T17:20:23Z (17 years ago)
Frank Marshall at GSFC <>
F. E. Marshall (NASA/GSFC) and J. Racusin (PSU) report on behalf
of the Swift team:

Swift/UVOT observed the field of GRB 070125 (Hurley et al., GCN Circ. 6024)
starting 13 hours after the burst. A bright, fading source
at the position reported by Cenko (GCN Circ. 6034)
is detected with the V and B filters. Additional observations
are now being taken with the other UVOT filters.

The table below gives the measured magnitudes for the currently
available data. T_start and T_end are the start and stop
times of the summed exposures in seconds from the trigger.
No correction has been made for the expected
Galactic reddening of E(B-V) = 0.05.

Filter  T_start   T_end  Exposure  Mag   Error
V       46685     53261   1736    18.54  0.06
V       58269     63986   1590    18.74  0.07
B       47550     54163   1674    18.92  0.03
B       59126     59947    798    19.03  0.06
Looking for U.S. government information and services? Visit