GCN Circular 16851
Subject
GRB 140928A: LCO-Cerro Tololo observations
Date
2014-09-29T13:27:52Z (10 years ago)
From
Drejc Kopac at Math Phys U,Slovenia <drejc.kopac@fmf.uni-lj.si>
D. Kopac (LJMU), C. Guidorzi (U. Ferrara), C. Mundell (LJMU), on behalf
of a large collaboration report:
Using the Las Cumbres Observatory Global Telescope Network (LCOGTN) 1-m
telescope in Cerro Tololo (Chile), we began observing Fermi GRB 140928A,
which was detected also by the Fermi/LAT (Desiante et al., GCN 16847).
Optical observations in r' and i' filters (5 x 120s sequences) started
on September 29 at 05:16:17 UT, i.e. ~18.8 hours after the Fermi/GBM
trigger.
At the position consistent with the XRT position (Pagani et al., GCN
16848) and with the GROND position (Varela et al., GCN 16849) we detect
an un-catalogued source with a preliminary magnitude of R = 20.1 +/- 0.2
at t_mid = 18.9 hours since the Fermi/GBM trigger time. The magnitude is
calibrated against nearby USNO-B1 stars.