GCN Circular 17082
Subject
GRB 141121A: LCO-FTN observations
Date
2014-11-21T12:46:18Z (9 years ago)
From
Cristiano Guidorzi at Ferrara U,Italy <guidorzi@fe.infn.it>
S. Dichiara and C. Guidorzi (U. Ferrara) on behalf of
a large collaboration report:
The Las Cumbres Observatory 2-m Faulkes Telescope North in
Hawaii began observing Swift GRB 141121A (Lien et al. GCN
Circ 17075) on November 21 at 10:42:54 UT, i.e. ~6.9 hours
after the BAT trigger, with the r' and i' filters.
We clearly detect the optical afterglow (Tanga et al.
GCN 17078; Perley et al. GCN 17081) with the following
magnitudes:
Mid time from Total Exp Filter Magnitude
trigger (hr) (s)
-------------------------------------------------
7.0 120x5 r' 19.62 +- 0.06
7.2 120x5 i' 19.42 +- 0.06
-------------------------------------------------
Magnitudes are calibrated against nearby SDSS stars.
Compared with GROND values we note a possible hint
for rebrightening or, in any case, for a very shallow
decay between the two epochs.