GCN Circular 14981
Subject
GRB 130702A: Continued P60 observations
Date
2013-07-04T08:05:48Z (11 years ago)
From
Daniel Perley at Caltech <dperley@astro.caltech.edu>
D. A. Perley, L. P. Singer (Caltech), and S. B. Cenko (GSFC) report:
We obtained additional observations of the location of the probable
afterglow of GRB 130702A with the Palomar 60-inch robotic telescope. A
series of repeated imaging sequences were taken in B, g, r, i, and z
filters during intermittent clouds. Example photometry from one
sequence is as follows:
tstart(d) exp(s) filt mag unc
2.20405 120 i = 19.129 +/- 0.05
2.20565 120 r = 19.297 +/- 0.05
2.20728 120 B = 19.635 +/- 0.07
2.20888 120 z = 19.204 +/- 0.16
2.21048 120 g = 19.519 +/- 0.08
Compared to our previous night's P60 observations (Singer et al., GCN
14967) and referenced to the GBM trigger time (Collazzi et al., GCN
14972), the fading is consistent with a power law with decay index of
approximately alpha=1.1, steeper than that inferred during the first 24
hours.