[vsnet-grb-info 15911] GRB 141220A: LT optical afterglow observations

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  17199
SUBJECT: GRB 141220A: LT optical afterglow observations
DATE:    14/12/20 08:32:50 GMT
FROM:    Cristiano Guidorzi at Ferrara U,Italy  <guidorzi at fe.infn.it>

C. Guidorzi (U. Ferrara), A. Gomboc (U. Ljubljana)
on behalf of a larger collaboration report:

The 2-m Liverpool Telescope automatically began observing Swift
GRB 141220A (Cummings et al. GCN 17196) on Dec 20 at 06:04:57 UT
(125 sec after the burst trigger).
The robotic LT-TRAP pipeline identified the optical afterglow
at the position reported by Gorosabel et al. (GCN 17197)
with r=18.6 +- 0.1 mag at 34 minutes after the GRB,
calibrated against nearby SDSS-R stars.