[vsnet-grb-info 10963] GRB 110918A: Liverpool Telescope optical observations

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  12382
SUBJECT: GRB 110918A: Liverpool Telescope optical observations
DATE:    11/09/21 22:18:29 GMT
FROM:    Drejc Kopac at Math Phys U,Slovenia  <drejc.kopac at fmf.uni-lj.si>

C. Guidorzi (U. Ferrara), D. Kopac (U. Ljubljana) and N. R. Tanvir (U.
Leicester), on behalf of a large collaboration report:

We observed the optical afterglow of GRB 110918A (Cenko et al., GCN 12367)
with the 2-m Liverpool Telescope, starting at 01:07 UT on 2011 September
21. We took 6 images in R band with exposure time 300s and we clearly
detect the optical afterglow. Our preliminary photometry yields:

Mid time from   Exp    Filter   Magnitude
trigger (days)  (sec)
-------------------------------------------
2.16            1800   R        19.7 +- 0.1
-------------------------------------------

The magnitude is calibrated against nearby USNO-B1.0 stars and is not
corrected for the Galactic extinction.