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GCN Circular 5235

Subject

GRB 060605: RTT150 optical observations

Date

2006-06-07T05:50:54Z (19 years ago)

From

Irek Khamitov at TUG <irekk@tug.tug.tubitak.gov.tr>

I. Khamitov (TUG), A.T. Saygac (Ist.Uni), Z. Aslan (TUG), U. Kiziloglu 
(METU), E. Gogus (Sabanci Uni.), S.Alis, O.Onal (Ist.Uni)
R. Burenin, M. Pavlinsky, R. Sunyaev (IKI)
I. Bikmaev, N. Sakhibullin (KSU/AST),

report:

We observed the field around the position of the optical counterpart
(Rykoff et al. GCN5220Loading...
 
 , Page et al., GCN5221Loading...
 
 ) of GRB060605 (Swift trigger
213630) with the Russian-Turkish 1.5-m telescope (RTT150, Bakirlitepe,
TUBITAK National Observatory, Turkey), at the beginning of June 07, about 
31.1 hours after the burst. A series of frames was taken in R band with 
TFOSC. The afterglow is detected on combined image.

http://www.tug.tubitak.gov.tr/~irekk/grb/grb060605/GRB060605_0607_RTT150.JPG

Using USNO-B1 star (RA=21:28:40.26, DEC=-06:03:44.5, R2MAG=15.37)
we estimate the following R magnitude for the OT:

     t-t0  m_R     err
     31.1  23.0    0.2

Using all data (Khamitov et al., GCN5224Loading...
 
 ) we estimate the power-law decay
index in R as -1.7+-0.02, which did not changed since ~5.6 hours after the 
burst.

Our R lightcurve can be found at:

http://www.tug.tubitak.gov.tr/~irekk/grb/grb060605/GRB060605_lc0607.jpg

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