[vsnet-grb-info 14897] GRB 140430A : Liverpool Telescope optical afterglow observations

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  16192
SUBJECT: GRB 140430A : Liverpool Telescope optical afterglow observations
DATE:    14/04/30 22:21:29 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), R. J. Smith and C. G. Mundell (LJMU), on behalf of a large collaboration report:

The 2-m Liverpool Telescope with the RINGO3 polarimeter robotically followed up Swift GRB 140430A (Siegel et al., GCN 16190) at 20:35:40 UT (~2 min after the burst trigger).

We detect the optical afterglow at the UVOT position. In a coadded 3x10s SDSS-r image, we estimate a preliminary magnitude R = 18.4 +/- 0.1 at t_mid = 33.1 min since the Swift/BAT trigger time. The magnitude is calibrated against nearby USNO-B1 stars.

Observations are ongoing.