GCN Circular 7681
Subject
GRB 080430: TLS imaging one day after the GRB
Date
2008-05-05T20:00:39Z (16 years ago)
From
Alexander Kann at TLS Tautenburg <kann@tls-tautenburg.de>
D. A. Kann, F. Ludwig, R. Filgas and S. Klose (TLS tautenburg) report:
We imaged the afterglow (Klotz et al., GCN 7646) of GRB 080430 (Guidorzi
et al., GCN 7647) with the TLS Schmidt telescope one day after the GRB.
Direct RRM observations a day earlier were unobtainable due to persistent
bad weather. We obtained 22 180 second images starting with twilight under
good conditions and at airmass 1. The afterglow is visible on all single
images.
From the SDSS photometry of the field (Cool et al., GCN 7649), we find
that the bright star southeast of the afterglow, at R.A. = 11:01:16.88,
Dec. = +51:40:38.6 has g = 17.111, r = 16.539 and i = 16.377. Using the
transformations of Jester et al. 2005, we find Rc = 16.458 for this star.
Using it as a comparison star, we derive for the afterglow from a stack of
all images:
time after burst Rc dRc
1.020536 days 21.20 0.06
This is in good agreement with the slightly later measurement of Khamitov
et al. (GCN 7661) but significantly fainter than the magnitude reported by
Pandey et al. (GCN 7663) for an observation a few hours earlier.
Data analysis was delayed by access problems.
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