GCN Circular 3931
Subject
GRB050906: P60 Observations
Date
2005-09-06T18:43:23Z (19 years ago)
From
Derek Fox at PSU <dfox@astro.psu.edu>
Derek B. Fox (Penn State), S. Bradley Cenko (Caltech) and Brian
P. Schmidt (RSAA, ANU) report on behalf of a larger collaboration:
"The Robotic Palomar 60-Inch Telescope (P60) responded automatically
to the Swift localization of the possible GRB050906 (Trigger #153866;
Krimm et al., GCN 3926) and began imaging 114s after the burst. No
new sources are apparent in the individual images by comparison to the
second-generation DSS. At the mean epochs of our coadded R-band and
i-band images, we can set the following limits on the magnitude of any
new point source within the Swift/BAT localization region:
Time (UT) Delta Limit (mag)
===================================
10:39:55 +7m50s R > 19.7
10:41:41 +9m36s I > 19.8
11:04:32 +32m27s R > 20.4
11:07:49 +35m44s I > 20.5
===================================
Photometric zero-points are derived from the USNO-B1.0 catalog R-band
and I-band magnitudes for this field for our R- and i-filter images,
respectively.
Moreover, we note that there is no new point source apparent near
or superposed on the bright galaxy inside the BAT error circle
(Levan & Tanvir, GCN 3927) by comparison to the DSS."