GCN Circular 12089
Subject
GRB 110625A: ROTSE-III Optical Limits
Date
2011-06-25T22:24:00Z (13 years ago)
From
Weikang Zheng at U.of Michigan <zwk@umich.edu>
W. Zheng (U Mich) and W. Rujopakarn (Steward), report on behalf of the ROTSE
collaboration:
ROTSE-IIId, located at the Turkish National Observatory at Bakirlitepe,
Turkey, responded to GRB 110625A (Swift trigger 456073; Page et al., GCN
12088), producing images beginning 6.8 s after the GCN notice time. An
automated response took the first image at 21:08:48.8 UT, 20.3 s after the
burst, and during the gamma-ray emission, under fair conditions. We took 10
5-sec, 10 20-sec and 110 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 15.5-16.6; we set the following specific limits.
start UT end UT t_exp(s) mlim t_start-tGRB(s) Coadd?
--------------------------------------------------------------------
21:08:48.8 21:10:56.3 127 16.9 20.3 Y
21:11:05.2 21:15:42.8 277 17.5 156.7 Y
21:15:51.7 21:20:29.5 277 17.5 443.2 Y