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GCN Circular 17337

Subject
GRB 150120B, Optical observations
Date
2015-01-21T12:02:24Z (9 years ago)
From
Shashi Bhushan Pandey at ROTSE <shaship@umich.edu>
S. B. Pandey (ARIES Nainital India, on behalf of larger Indian GRB
collaboration)

The 1.04m Sampurnanand telescope at ARIES Nainital began observations
of the Swift-detected GRB 150120B (D'Elia et al., GCN 17314) starting at
13:34:44 UT on 2015-01-20. Several frames in R_c pass-band 300sec each
were acquired in poor sky conditions.

In the co-added image (6x300 sec), we detect the optical afterglow candidate
at R_c ~ 21.7+-0.1 mag to the location consistent with that reported by
Perley et al. (GCN 17315), Guidorzi et al. (GCN 17316). The temporal
power-law
flux decay seems to follow an index of 0.7 at the epoch of our observations
as reported by Perley & Cenko (GCN 17335). The photometry was performed in
comparison to nearby USNO- B1 stars.

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