[vsnet-grb-info 14678] GRB 140318A: Liverpool Telescope optical observations

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  15992
SUBJECT: GRB 140318A: Liverpool Telescope optical observations
DATE:    14/03/18 09:01:24 GMT
FROM:    Andrea Melandri at INAF-OAB  <andrea.melandri at brera.inaf.it>

A. Melandri (INAF-OAB), C. Guidorzi (U. Ferrara), A. Gomboc (U. Ljubljana), I. A. Steele and C. G. Mundell (LJMU), on behalf of a large collaboration report:

The 2-m Liverpool Telescope robotically followed up Swift GRB 140318A (Cenko et al., GCN 15986) at 00:27:37 UT (~18.5 min after the burst trigger).

We clearly detect the optical afterglow at the position reported by Schulze et al. (GCN 15987). In a coadded 6x10s SDSS-r image, we estimate the magnitude r' = 19.84 +- 0.11 at t_mid = 50.6 min since the Swift/BAT trigger time. The magnitude is calibrated against nearby SDSS stars.