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GCN Circular 16145

GRB 140423A: ROTSE-III Detection of Optical Counterpart
2014-04-23T10:01:48Z (10 years ago)
Farley V. Ferrante at Southern Methodist U/ROTSE <>
F. V. Ferrante (SMU), T. Guver (Istanbul Univ.), H. Flewelling (IfA/Hawaii), R. Kehoe (SMU),
and G. Dhungana (SMU) report on behalf of the ROTSE GRB team:

ROTSE-IIIb, located at McDonald Observatory, Texas, responded to GRB 140423A
(Swift trigger 596901, GCN 16142; Elenin et al., GCN 16143; A. Kaur et al., GCN 16144).
The first image was at 08:32:45.1 UT, 51.5 s after the burst (0.1 s after the GCN notice time).
The unfiltered images are calibrated relative to USNO A2.0. We detect a 14.2 magnitude,
fading source with coordinates:

     13:09:08.08      +49:50:26.5    (J2000), with positional uncertainty of 1" or better

start UT        mag     mlim(of image)
08:33:39.6     14.2     16.0

This source is not visible in DSS (second epoch), 2MASS or the MPChecker database.

The object decayed from ~14.2 magnitude to ~15.0 magnitude in ~100 seconds.

A jpeg image is available at

Continuing observations are in progress.
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