GCN Circular 9224
Subject
GRB 090424: ROTSE-III Confimation of Optical Counterpart
Event
Date
2009-04-24T14:35:53Z (17 years ago)
From
Fang Yuan at ROTSE <yuanfang@umich.edu>
F. Yuan (U Mich), report on behalf of the ROTSE collaboration:
ROTSE-IIIa, located at Siding Spring Observatory, Australia, responded
to GRB 090424 (Swift trigger 350311;Cannizzo et al, GCN 9223). The
first image started at 14:18:41.4 UT, ~6 min after the burst. The
unfiltered images are calibrated relative to USNO A2.0. We detect a
fading source at the position consistent with the UVOT OT, at the
following magnitude:
start UT mag mlim(of image)
----------------------------------
14:18:41.4 15.5 17.2
This source is not visible in DSS (second epoch), 2MASS or the
MPChecker database.
A jpeg image is available at http://www.rotse.net/images/gsb350311_3a001-010_key.jpg
Note that the object marked 12 is the candidate in question.
Continuing observations are in progress.