TITLE:   GCN CIRCULAR
NUMBER:  14152
SUBJECT: GRB 130122A: RTT150 optical observations
DATE:    13/01/28 12:20:09 GMT
FROM:    Irek Khamitov at TUG  <irekk@tug.tug.tubitak.gov.tr>

A. Galeev (KFU/AST), I. Khamitov (TUG),
I. Bikmaev, N. Sakhibullin (KFU/AST),
R. Burenin, M. Pavlinsky, R. Sunyaev (IKI),
H. Kirbiyik (TUG), U. Kiziloglu (METU), E. Gogus (Sabanci Uni.)

report:

The field of the optical afterglow of GRB 130122A (Lien et al., GCN 14140)
was observed with Russian-Turkish 1.5-m telescope (RTT150, Bakirlitepe, 
TUBITAK National Observatory, Turkey) in partially cloudy conditions.
Using the TFOSC instrument we obtained BVR images by 300s starting at 
January 23, 02:38:31 UT, i.e. 2.91 hours after the burst. The afterglow is 
clearly detected in all images.

On our images we find the optical transient at the coordinates with 
uncertainty of 0.1 arcsec:
  R.A. (J2000) =  12 57 08.317
  Dec. (J2000) = +59 00 53.62

Using the same USNO-B1 star reported by Sonbas et al. (GCN 14141) as a 
reference, we estimated the R-magnitudes of the afterglow:

T-T0,  Mag. +/- Mag.err
(hour)
2.95  19.88 +/- 0.13
3.06  20.07 +/- 0.10
3.17  19.94 +/- 0.20
3.28  20.00 +/- 0.09
3.33  19.79 +/- 0.13

The combined image of the field can be found at:
http://hea.iki.rssi.ru/grb/130122a/indexeng.html

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