GCN Circular 6034
Subject
GRB 070125: Continued P60 Observations
Event
Date
2007-01-26T11:02:12Z (19 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 continued to monitor the proposed optical afterglow of GRB 070125
(GCN 6028) with the Palomar 60-inch telescope. We began a new series of
R-band observations at ~ 9:29 UT 26 Jan. Using 50 point sources from the
2MASS catalog, we have refined the astrometry of our imaging. The updated
position (J2000.0) for the optical candidate is:
RA: 07:51:17.767, Dec: +31:09:04.11
with an uncertainty of +/- 0.3" in each coordinate. The position of the
source is consistent between the two epochs, placing an upper limit on any
proper motion of <~ 0.06 arcsec / hr. Furthermore, from a preliminary
analysis of the photometry, we find evidence the source has faded by ~
0.13 mag between our two epochs. Observations and analysis are
continuing.
Given the unusual nature of the spectrum of this object (Prochaska et
al., GCNs 6031 & 6032), we urge further optical monitoring to confirm
this object is indeed the optical afterglow of GRB 070125.