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GCN Circular 16851

Subject
GRB 140928A: LCO-Cerro Tololo observations
Date
2014-09-29T13:27:52Z (9 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.
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