GCN Circular 9675
Subject
GRB 090715B: Observation of the optical afterglow
Date
2009-07-16T08:27:41Z (15 years ago)
From
Angelo Antonelli at Obs. Astro. di Roma <a.antonelli@oa-roma.inaf.it>
L. A. Antonelli (INAF-OAR), S. Marinoni (INAF-TNG), F. Montalvo (UNAM-
OAN), A. Vazquez (UNAM-IA) report:
We observed the field of GRB 090715B (Vetere et al., GCN 9668) with
the 1.5 m Telescope in San Pedro Martir (BCN-Mexico) equipped with
LaRuca, in the B, V, and R filters.
We started observations on 2009 July 16.1729 UT (7.07 hrs after the
burst) and we detect the object reported by Malesani et al., (GCN
9671), Smith et al. (GCN 9670) and Vetere et al. (GCN 9668) in all
filters. The object has a magnitude R = 20.4 +- 0.1 (calibrated
against USNO B1). The object has faded with respect of the value
reported by Malesani et al., (GCN 9671) with a decay index of 0.77
+-0.39. Due to its fading behavior we can confirm that it is the
optical afterglow of GRB 090715B.
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