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GCN Circular 9224

Subject
GRB 090424: ROTSE-III Confimation of Optical Counterpart
Date
2009-04-24T14:35:53Z (15 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.
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