GRB060111A

Physics

Scientific paper

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Grb, Optical Counterpart

Scientific paper

We observed field around of possible optical counterpart (Blustin et al., GCN4482) of GRB060111A (Swift trigger 176818) with Russian-Turkish 1.5-m telescope (RTT150, Bakyrlytepe, TUBITAK National Observatory, Turkey), starting on Jan. 12, 03:37UT, i.e. ~23.2 hours after the burst.
A series of frames (8*300s exposures in R band) were taken. The afterglow candidate was detected only marginally near the detection limit of our combined image, which is estimated as R~23.2 (photometry is USNO-B1 calibrated). We also note that at about 5 arcsec from the OT we detected an extended source whith R=21.75+/-0.1, which may be a host galaxy of the GRB. The coordinates of this galaxy are RA= 18h24m49.01s (J2000.0) DEC=+37d36'09."6 (J2000.0).
The finding chart can be found at: http://www.tug.tubitak.gov.tr/~irekk/grb/grb060111a/grb060111A.JPG
Also we have to do a correction to GCN4493: We detected extended source in direction to SE, not NW. The upper limit for the GRB060111B OT is also actually deeper: R=~23.6 (the difference is due to corrected error in photometric calibration).

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