GCN Circular 12769
Subject
GRB 111228A: T100 observations
Date
2011-12-29T16:36:46Z (12 years ago)
From
Tolga Guver at UA <tolga@physics.arizona.edu>
T. Guver (Sabanci Univ.), E. Sonbas (Adiyaman Univ.), S. Kaynar
(Akdeniz Univ.), E. Gogus (Sabanci Univ.), Z. Eker (TUG) report on
behalf of a larger collaboration
We observed the field of Swift GRB 111228A (Ukwatta et al., GCN 12737)
with the 1.0 meter T100 telescope (TUBITAK National Observatory,
Antalya - Turkey), starting December, 28, 22:48 UT (~ 7 hours after
the trigger). Observations were carried out in the B, R, and V filters
under good weather conditions. The afterglow is clearly detected in
all images.
Using the USNO-B1 star USNO-B1 1083-0199833 (RA = 10:00:22.72, Dec =
+18:19:23.85 - same as used by Klotz et al., GCN 12746 and Nascimbeni
et al., GCN 12748) in the field we estimated the following magnitudes
for the OT:
t - t0 (h) Exp. (s) Filter mag. err
6.859 300 B 19.12 +/- 0.04
6.958 300 B 19.56 +/- 0.07
8.219 300 B 19.58 +/- 0.04
8.317 300 B 19.39 +/- 0.05
7.057 300 R 18.45 +/- 0.02
7.155 300 R 18.50 +/- 0.02
8.416 300 R 18.58 +/- 0.02
8.514 300 R 18.61 +/- 0.03
We are grateful to the TUBITAK National Observatory staff for promptly
scheduling the observations and their technical support.
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