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GCN Circular 11966

Subject
GRB 110422A: THO optical observations
Date
2011-04-23T04:09:32Z (13 years ago)
From
Veli-Pekka Hentunen at Taurus Hill Obs,A95 <veli-pekka.hentunen@kassiopeia.net>
Veli-Pekka Hentunen, Markku Nissinen and Tuomo Salmi (Taurus Hill
Observatory, Varkaus, Finland) report:

Taurus Hill Observatory's (A95) Celestron C-14 (OTA) telescope 14"
FL 3910 mm with NextGEN 0.5X optical reducer and SBIG ST-8XME 
camera were used to detect GRB 110422A optical afterglow. The 
observations were started at 2011-04-22 20:26:30 (UT) and stopped at 
2011-04-22 20:57:20 (UT) (~5 hours after the trigger). Six unfiltered 
observations with 300s exposure time were made. The afterglow was 
detected at following position RA 7 28 10.98 and DEC +75 06 25.4 
consistent those given by Elunko E. et al. (GCN 11958) to within positional
errors.

The following magnitudes were obtained from the observations using 
NOMAD1 1651-0051346 (R = 16.040) as the comparison:

Tmid(s)+T0  Filter          Exp (sec)     Mag      Mag err   Limit (sigma 3)
17285           unfilt          300             19.5         0.7         19.7
17535           unfilt          300             19.6         0.8         19.7
18152           unfilt          300             19.4         0.7         19.7
18462           unfilt          300             19.7         0.9         19.7

 
A png image of the 3x300sec clear filter observations is available at the 
following URL link:
http://cutenews.kassiopeia.net/data/upimages/GRB_110422A_OA_THO.png
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