GCN Circular 7529
Subject
GRB080325 - I and z-band Imaging
Date
2008-03-28T15:27:18Z (17 years ago)
From
Myungshin Im at Seoul Nat U <mim@astro.snu.ac.kr>
M. Im, I. Lee (Seoul National Univ), and Y. Urata (Saitama U/ASIAA)
on behalf of EAFON team.
We took a series of I-band and z-band images of GRB080325,
using the 1.0m telescope at Mt. Lemmon (Arizona, US)
operated by the Korea Astronomy Space Science Institute.
The z-band observation started at March 27, 08:46:06 UT
(2.19223 days after the burst) and the I-band observation
started at March 27, 10:41:05 UT (2.27208 days after the burst).
We do not find an optical counterpart at the location of
the NIR afterglow candidate reported by Tanaka et al. (GCN 7524),
in both I and z-band stacked images.
We set the limit of the GRB afterglow as I > 21.2 mag (3-sigma),
calibrated with a USNO-B star at (18:31:36.3, 36:31:51.0).
The afterglow candidate reported by Updike et al. (GCN 7515)
is detected at both I- and z-bands, with the I-band magnitude
of I=19.0 +- 0.1 mag, calibrated with the same star as above.
However, we note that this object is also visible in the DSS
image (POSS-II), and therefore it is unlikely to be a GRB afterglow.
We thank the LOAO operator, I. Baek for her assistance for this
observation.