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GCN Circular 9783

Subject

GRB 090813: P60 Optical Afterglow Confirmation

Date

2009-08-13T05:25:55Z (15 years ago)

From

S. Bradley Cenko at Caltech <cenko@srl.caltech.edu>

S. B. Cenko (Caltech) reports on behalf of a larger collaboration:

We have imaged the field of GRB090813 (Cummings et al., GCN 9781Not found
 
 
) with the
automated Palomar 60 inch telescope.  Observations were taken in the Sloan
r', i', and z' filters beginning at approximately 4:12 UT (~ 2 minutes
after the burst).

Inside the XRT error circle we find a fading point source with coordinates
(J2000.0):

   RA: 15:03:08.48
   Dec: +88:34:05.5

with an estimated error of ~ 0.3" in each coordinate.  Presumably this is
the same source identified by Gorosabel et al. (GCN 9782Not found
 
 
).

With reference to several USNO-B1 sources in the field, we measure the
following I-band magnitudes for the afterglow:

UT (mid-point)     Exposure (s)       Magnitude
----------------------------------------------------------------
04:15:47           60                 17.8
04:20:33           60                 18.2

Further observations are planned.