GCN Circular 14407
Subject
GRB 130420A: ROTSE-III Detection of Optical Counterpart
Date
2013-04-20T08:08:48Z (11 years ago)
From
Tolga Guver at UA <tolga@physics.arizona.edu>
GRB 130420A: ROTSE-III Detection of Optical Counterpart
T. Guver (Sabanci U), report on behalf of the ROTSE collaboration:
ROTSE-IIIb, located at McDonald Observatory, Texas, responded to GRB 130420A (Swift trigger 553977). The first image was at 07:29:51.5 UT, 82.0 s after the burst (7.5 s after the GCN notice time). The unfiltered images are calibrated relative to USNO A2.0. We detect a 15.5 magnitude, fading source with coordinates:
13:04:25.5 +59:25:27.2 (J2000), with positional uncertainty of 1" or better
start UT mag mlim(of image)
----------------------------------
07:34:12.7 15.5 16.5
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/gsq553977_3b03_img.jpg Note that the object marked 91 is the candidate in question.
Continuing observations are in progress.
