GCN Circular 13745
Subject
GRB 120911A: ROTSE-III Optical Limits
Date
2012-09-11T07:45:30Z (12 years ago)
From
Wiphu Rujopakarn at U AZ/Steward <rujopakarn@gmail.com>
W. Rujopakarn (Steward), T. Guver (Sabanci U), report on behalf of the
ROTSE collaboration:
ROTSE-IIIb, located at McDonald Observatory, Texas, responded to GRB
120911A (Swift trigger 533268; Cannizzo et al., GCN 13744), producing
images beginning 9.2 s after the GCN notice time. An automated
response took the first image at 07:09:04.2 UT, 30.4 s after the
burst, under fair conditions. We took 10 5-sec, 10 20-sec and 40
60-sec exposures. These unfiltered images are calibrated relative to
USNO A2.0 (R). Imaging is on going.
Comparison to the DSS (second epoch) reveals no new sources within the
3-sigma Swift/BAT error circle; however, we are limited as the field
is somewhat crowded. Individual images have limiting magnitudes
ranging from 15.5-16.6; we set the following specific limits.
start UT end UT t_exp(s) mlim t_start-tGRB(s) Coadd?
--------------------------------------------------------------------
07:09:04.2 07:09:09.2 5 15.5 30.4 N
07:09:04.2 07:10:46.4 50 16.9 30.4 Y