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GCN Circular 10349

Subject

GRB 100117A: candidate optical afterglow

Date

2010-01-19T20:04:13Z (14 years ago)

From

Andrew Levan at U.of Leicester <A.J.Levan@warwick.ac.uk>

A.J. Levan (Warwick), J. Graham, A. Fruchter (STScI), N. Tanvir
(Leicester) A. Cucchiara, D. Fox (PSU), E. Berger, R. Chornock
(Harvard) report for a larger collaboration:

"We obtained a second epoch of Gemini North imaging of the short
duration GRB 100117A (De Pasquale et al. GCN 10336Not found
 
 
) beginning at
06:17 UT. A total of 2700s of observations were acquired in the
r-band.

Comparison with our first epoch of observations (Cucchiara et al.
GCN 10341Not found
 
 
) reveals that source S3 identifed by Cenko et al. (GCN
10339Not found
 
 
) has faded by 0.23 +/- 0.06 magnitudes in the timeframe between
the two epochs of observation (approximately 25 hours). This is
confirmed by image subtraction, which shows an offset from the centre
of S3 by ~0.6".

We suggest this is the afterglow of GRB 100117A. "