GCN Circular 8170
Subject
GRB 080903: ROTSE-III Optical Limits
Date
2008-09-03T02:12:02Z (16 years ago)
From
Fang Yuan at ROTSE <yuanfang@umich.edu>
F. Yuan (U Mich), W. Rujopakarn (Steward), H. Swan (U Mich), D.A.
Smith (Guilford), T. Guver (U Arizona) report on behalf of the ROTSE
collaboration:
ROTSE-IIId, located at the Turkish National Observatory at
Bakirlitepe, Turkey, responded to GRB 080903 (Swift trigger 323542;
Grupe et al., GCN 8169), producing images beginning 6.7 s after the
GCN notice time. An automated response took the first image at
01:12:47.7 UT, 24.4 s after the burst, and during the gamma-ray
emission, under fair conditions. We took 10 5-sec, 10 20-sec and 30 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 16.5-17.7; we set the following
specific limits.
start UT end UT t_exp(s) mlim t_start-tGRB(s) Coadd?
--------------------------------------------------------------------
01:12:47.7 01:14:55.9 128 17.7 24.4 Y
01:15:04.6 01:19:42.4 277 18.3 161.3 Y