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GCN Circular 22507

GRB 180316A: LCO Cerro Tololo observations
2018-03-16T12:10:56Z (6 years ago)
Renato Martone at Universita' di Ferrara <>
R. Martone, C. Guidorzi (U. Ferrara), S. Kobayashi (LJMU), C.G. Mundell (U. Bath), A. Gomboc (U. Nova Gorica), I.A. Steele (LJMU) on behalf of a large collaboration report:

We observed the field of Swift GRB180316A (Melandri et al., GCN 22500) on March 16, from 07:38 to 07:59 UT (mid time of 0.12 days post burst) with a 1-m unit LCO telescope in Cerro Tololo in the SDSS r��� i' filters. We detect the optical afterglow (Lipunov et al., GCN 22502; Schady and Steinmassl, GCN 22504) with the following magnitudes:

Mid time since GRB     Exp        Filter         Magnitude
(days)                 (s)
0.11                   4x120      SDSS-R         19.04 +- 0.05
0.12                   4x120      SDSS-I         18.88 +- 0.05

as calibrated against nearby SDSS stars.
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