GCN Circular 22944
Subject
GRB 180703A: optical afterglow confirmation
Date
2018-07-13T11:55:46Z (6 years ago)
From
Cristiano Guidorzi at Ferrara U,Italy <guidorzi@fe.infn.it>
C. Guidorzi, R. Martone (U. Ferrara), S. Kobayashi (LJMU), C.G. Mundell
(U. Bath), A. Gomboc (U. Nova Gorica), I.A. Steele (LJMU), A. Cucchiara,
D. Morris (U. of Virgin Islands) on behalf of a large collaboration report:
We observed Fermi-LAT GRB 180703A (Racusin et al. GCN 22883) with the
LCO 2-m unit in Hawaii (former FTN) on July 12, 17:46 UT (8.9 days after
the GRB trigger time) with the SDSS i' filter. We do not detect the
optical candidate (Guidorzi et al. GCN 22892) found on the border of the
Swift-XRT error circle of the confirmed X-ray afterglow (Gibson et al.
GCN 22931) down to a limit magnitude of i'> 22.0 with a 5x120s exposure.
We therefore confirm the nature of optical afterglow of the candidate. A
comparison between the images taken at both epochs is available at the
link below.
http://www.fe.infn.it/u/guidorzi/new_guidorzi_files/180703A_OT.png
