TITLE:   GCN CIRCULAR
NUMBER:  22487
SUBJECT: GRB 180314A: LCO Siding Springs observations
DATE:    18/03/14 17:03:19 GMT
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) on behalf of a 
large collaboration report:

We observed the field of Swift GRB180314A (D'Avanzo et al. GCN 22478) on 
March 14, from 10:00 to 10:25 UT (mid time of 0.39 days post burst) with 
1-m and 2-m unit LCO telescopes in Siding Springs in the SDSS gri 
filters. We detect the optical afterglow (D'Avanzo et al.; Bolmer GCN 
22479; Lipunov et al. GCN 22481; Melandri et al. GCN 22482; Sbarufatti 
et al. GCN 22484) with the following magnitudes:

Mid time since GRB     Exp        Filter         Magnitude
(days)                 (s)
-------------------------------------------------------------
0.39                   5x120      SDSS-R         21.5 +- 0.15
0.40                   5x120      SDSS-I         21.4 +- 0.2
-------------------------------------------------------------

as calibrated against nearby Pan-STARRS stars.