GCN Circular 8778
Subject
GRB 090102: GRT Optical Observation
Date
2009-01-04T17:13:41Z (16 years ago)
From
Takanori Sakamoto at NASA/GSFC <takanori.sakamoto-1@nasa.gov>
T. Sakamoto (UMBC/GSFC), D. Donato (ORAU/GSFC), N. Gehrels (GSFC),
T. Okajima (JHU/GSFC), T. N. Ukwatta (GWU/GSFC), Y. Urata (Saitama U),
C. Wallace (FGCU)
We observed the field of GRB 090102 detected by Swift (trigger #338895;
Mangano et al., GCN #8762) with the 14-inch Goddard Robotic Telescope (GRT)
located at the Goddard Geophysical and Astronomical Observatory
(http://cddisa.gsfc.nasa.gov/ggao/).
Ten set of 5 sec and five set of 10 sec and 30 sec exposures were taken in
the R filter starting from Jan. 2 03:11:58 (UT) about 16.2 min after
the trigger. We do not detect the optical afterglow (Klotz et al.,
GCN #8761, Mangano et al., GCN #8762) both in the individual
images and the combined image. The estimated three sigma upper limit
of the combined image (total exposure of 250 sec) is ~17.9 mag using
the USNO-B1 catalog.