[vsnet-grb-info 19631] GRB 170728B: LT afterglow confirmation
GCN Circulars
gcncirc at capella2.gsfc.nasa.gov
Sat Jul 29 13:50:54 JST 2017
TITLE: GCN CIRCULAR
NUMBER: 21375
SUBJECT: GRB 170728B: LT afterglow confirmation
DATE: 17/07/29 04:50:11 GMT
FROM: Cristiano Guidorzi at Ferrara U,Italy <guidorzi at fe.infn.it>
C. Guidorzi (U. Ferrara), C.G. Mundell (U. Bath), A. Gomboc (U. Nova
Gorica), S. Kobayashi, I.A. Steele (LJMU) on behalf of a large
collaboration report:
We began observing Swift GRB 170728B (Cenko et al. GCN 21371) on July
28, 23:06:47 UT (208 seconds since the GRB trigger) with 2-m Liverpool
Telescope with RINGO3 polarimeter and IO:O camera in the SDSS R filter.
We clearly detect the optical counterpart (D'Avanzo et al. GCN 21373;
Heintz et al. GCN 21374) with r'=20.43 +- 0.12 mag in a 6x10s frame at a
mid time of 36.5 minutes since GRB, as calibrated against nearby
Pan-STARRS1 sources.
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