GRB 060605: RTT150 optical observations

Details GRB 060605: RTT150 optical observations GRB 060605: RTT150 optical observations

Jun 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006gcn..5224....1k&link_type=abstract

GRB Coordinates Network, 5224, 1, 2006

Computer Science

3

Grb, Optical Counterpart

Scientific paper

We observed the field around the position of the optical counterpart (Rykoff et al. GCN 5220, Page et al., GCN5221) of GRB060605 (Swift trigger 213630) with the Russian-Turkish 1.5-m telescope (RTT150, Bakirlitepe, TUBITAK National Observatory, Turkey), starting at June 05, 23:41 UT, i.e. exposures in R) with TFOSC. The afterglow is detected clearly in all images. Observations were made under strong wind weather.
Using USNO-B1 star (RA=21:28:40.26, DEC=-06:03:44.5, R2MAG=15.37) we estimate the following Rc magnitudes for the OT:
t-t0 m_R err
5.62 19.767 0.03
5.83 19.873 0.03
6.17 19.911 0.03
6.37 20.010 0.04
The power-law decay index in R is -1.6+-0.3 between 5.62 and 6.37 hours after the burst. Comparing our decay slope with that derived from earlier ROTSE data (Schaefer et al., GCN 5222) we conclude that there was a break in OT light curve between 1 and 5 hours after the burst.
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