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GCN Circular 7593

GRB 080413: ROTSE-III Detection of Optical Counterpart
2008-04-13T03:03:03Z (16 years ago)
Wiphu Rujopakarn at U AZ/Steward <>
GRB 080413: ROTSE-III Detection of Optical Counterpart

E.S. Rykoff (UCSB), W. Rujopakarn (Steward), report on behalf of the ROTSE

ROTSE-IIIc, located at the H.E.S.S. site at Mt. Gamsberg, Namibia,
responded to GRB 080413A (Swift trigger 309096). The first image was at
02:54:39.7 UT, 20.4 s after the burst (6.7 s after the GCN notice time).
The unfiltered images are calibrated relative to USNO A2.0. We detect a
12.8 magnitude, fading source with coordinates:

19:09:11.8 -27:40:41.6 (J2000), with positional uncertainty of 1' or better

start UT mag mlim(of image)
02:54:39.7 12.8 15.3

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

A jpeg image is available at Note that the object
marked 7 is the candidate in question.

Continuing observations are in progress.
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