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GCN Circular 11655

GRB 110205A: Lightbuckets Optical Observations
2011-02-06T22:19:34Z (13 years ago)
Tilan Ukwatta at GSFC/GWU <>
T. N. Ukwatta (MSU), E. Sonbas (GSFC/USRA/Adiyaman Univ.),
N. Gehrels (GSFC), J. Linnemann (MSU), K. Tollefson (MSU),
and U. Abeysekara (MSU)

We observed the Swift GRB 110205A (Beardmore et al., GCN 11629)
with the Lightbuckets 0.61m rental telescope LB-0001 in Rodeo,
NM, USA. Under good weather conditions, two observations
were carried out in the Luminance and R filter starting
2011-02-05 at 07:45:58 UT (~ 5.7 hours after the GRB trigger)
and 09:39:21 UT (~7.6 hours after the GRB trigger). Another
followup observation was performed on R filter starting
2011-02-06 at 09:29:04 UT (~1.31 days after the trigger)
under acceptable weather conditions.

The burst afterglow is clearly detected in the first two
observations and estimated magnitudes are given below:

Time after trigger       Exposure (s)   Filter     Magnitude

5.7  hours (0.24 days)     1 x 300        Lum     19.0 +/- 0.1
7.6  hours (0.31 days)     1 x 300         R      19.6 +/- 0.2
31.4 hours (1.31 days)     2 x 300         R      > 20.1

The afterglow, not corrected for Galactic extinction, is
calibrated against the USNO-B1.0 catalog.

We acknowledge the helpful assistance of the Lightbuckets staff,
in particular Stephen G. Cullen.
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