GCN Circular 7472
Subject
GRB 080320: ROTSE-III Optical Limits
Date
2008-03-20T05:01:51Z (16 years ago)
From
Fang Yuan at ROTSE <yuanfang@umich.edu>
F. Yuan (U Mich), E.S. Rykoff (UCSB), W. Rujopakarn (Steward), report on
behalf of the ROTSE collaboration:
ROTSE-IIIb, located at McDonald Observatory, Texas, responded to GRB
080320 (Swift trigger 306858), producing images beginning 6.5 s after
the GCN notice time. An automated response took the first image at
04:38:10.5 UT, 32.1 s after the burst, under fair conditions. We took 10
5-sec, 10 20-sec and 20 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 or the XRT error circle, for both single
images and coadding into sets of 10. Individual images have limiting
magnitudes ranging from 16.4-17.5; we set the following specific limits.
start UT end UT t_exp(s) mlim t_start-tGRB(s) Coadd?
--------------------------------------------------------------------
04:38:10.5 04:38:15.5 5 16.5 32.1 N
04:38:10.4 04:39:17.5 67 18.1 32.0 Y