GCN Circular 3981
Subject
GRB050915: P60 Optical Observations
Event
Date
2005-09-15T13:54:17Z (20 years ago)
From
S. Bradley Cenko at Caltech <cenko@srl.caltech.edu>
S. Bradley Cenko (Caltech) and Derek B. Fox (Penn State) report on behalf
of a larger collaboration:
We have imaged the error circle of GRB 050915 (Grupe et al., GCN 3977)
with the automated Palomar 60-inch telescope. Observations began
approximately 4 minutes after the burst in the Kron R and Gunn i filters.
Inside the XRT error circle (Kennea et al., GCN 3979), we find no source
present.
Using the USNO-B object located at 05:26:48.6, -28:00:48.9 (J2000.0, R2 =
17.90, I2 = 17.88) as a reference, we find the following 3-sigma upper
limits for any point-source in the XRT error circle:
Filter Int Time (s) Mean UT Tb (min) Mag
---------------------------------------------------------------------------
R 540 11:41 18 > 21.0
i 540 11:43 20 > 20.5