GCN Circular 8787
Subject
GRB 090107B: ROTSE-III Optical Limits
Date
2009-01-07T17:48:17Z (15 years ago)
From
Tolga Guver at UA <tolga@physics.arizona.edu>
GRB 090107B: ROTSE-III Optical Limits
T. Guver (U Arizona), H. Swan (U Mich), report on behalf of the ROTSE
collaboration:
ROTSE-IIId, located at the TUBITAK National Observatory at
Bakirlitepe, Turkey, responded to GRB 090107B (INTEGRAL trigger 5398;
D. Gotz, GCN 8786), producing images beginning 0.0 s after the GCN
notice time. An automated response took the first image at 16:20:40.7
UT, 4.7 s after the burst, and during the gamma-ray emission, under
fair conditions. We took 10 5-sec, 10 20-sec and 63 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 INTEGRAL/IBIS error circle, for both single images and
coadding into sets of 10. Individual images have limiting magnitudes
ranging from 16.2-16.6; we set the following specific limits.
start UT end UT t_exp(s) mlim t_start-tGRB(s) Coadd?
--------------------------------------------------------------------
16:26:35.8 16:26:55.8 20 16.6 359.8 N
16:28:03.0 16:32:41.6 278 17.7 447.0 Y