[vsnet-grb-info 13471] GRB 130606A: P60 Observations
GCN Circulars
gcncirc at capella2.gsfc.nasa.gov
Fri Jun 7 20:49:04 JST 2013
TITLE: GCN CIRCULAR
NUMBER: 14804
SUBJECT: GRB 130606A: P60 Observations
DATE: 13/06/07 11:48:56 GMT
FROM: Daniel Perley at Caltech <dperley at astro.caltech.edu>
D. A. Perley (Caltech) and S. B. Cenko (GSFC) report on behalf of a
larger collaboration:
We imaged the field of GRB 130606A (Ukwatta et al., GCN 14781) with the
robotic Palomar 60-inch telescope throughout the night of 2013-06-07 UT,
beginning at 04:01 UT and continuing until morning twilight at 11:39 UT.
Initial observations consisted of a series of r, i, and z-band frames;
later in the night we switched to exclusively z-band observations.
Transparency and seeing conditions were good throughout.
The GRB afterglow (Jelinek et al., GCN 14782; Xu et al., GCN 14783;
Nagayama et al., GCN 14784) is well-detected in the z-band exposures and
marginally detected in the other filters. Preliminary (not
fringe-corrected) aperture photometry of a few select points yields:
t_start(d) t_exp(s) filter magnitude
0.30679 180 z = 18.62 +/- 0.08
0.42224 180 z = 19.22 +/- 0.09
0.50888 180 z = 19.59 +/- 0.11
0.58040 180 z = 19.73 +/- 0.22
The afterglow decays as a power-law with an index of approximately
alpha=1.6-1.7 over the course of the observations.
Given the redshift (Castro-Tirado et al., GCN 14796; Lunnan et al., GCN
14798) these relatively bright fluxes indicate an extremely luminous
afterglow, especially at early times; similar to the luminous
high-redshift GRB 050904 (e.g. Kann, Masetti, & Klose 2007; AJ 133:1187).
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