GCN Circular 12782
Subject
GRB 111229A: Faulkes Telescope South observations
Date
2011-12-30T12:16:31Z (12 years ago)
From
Cristiano Guidorzi at Ferrara U,Italy <guidorzi@fe.infn.it>
C. Guidorzi (U. Ferrara), A. Melandri (INAF-OAB)
report on behalf of the LJMU GRB group:
The 2-m Faulkes Telescope South observed Swift
GRB 111229A (Lien et al. GCN Circ. 12774)
on December 30, from 10:08 UT, corresponding to
11.5 hours after the BAT trigger time.
We clearly detect the optical afterglow (Nicuesa
Guelbenzu et al. GCN Circ 12775; Cucchiara et al.
GCN Circ. 12777) in the R filter and marginally
in the i' filter with the following magnitude:
Mid time from Total Exp Filter Magnitude Limit
trigger (hr) (s)
--------------------------------------------------------
11.77 6x300 i' 21.6 +- 0.5 >20.9
12.34 6x300 R 21.4 +- 0.1
--------------------------------------------------------
Magnitudes are calibrated against nearby USNOB-1 stars.
Comparing with GROND observations (Nicuesa Guelbenzu
et al GCN 12775), we derive an average power-law decay
index of about 0.8.