GCN Circular 20216
Subject
GRB 161129A: Tautenburg Ic-band observations
Date
2016-11-29T17:57:04Z (7 years ago)
From
Sylvio Klose at TLS Tautenburg <klose@tls-tautenburg.de>
S. Klose and B. Stecklum (both Thueringer Landessternwarte Tautenburg)
report:
We imaged the field of GRB 161129A (Kocevski et al., GCN 20210) with the
Tautenburg Schmidt telescope equipped with the prime focus CCD camera.
Observations were performed at a midtime of 16:41 UT (November 29).
Inside the enhanced XRT error circle (radius 1.7 arcsec; Beardmore et al.,
GCN 20211) we find a faint source at coordinates RA, Decl. (J2000) =
21:04:54.53, 32:08:05.9 (+/- 0.5 arcsec). Using the USNO B2 star at
coordinates RA, Decl. (J2000) = 21:04:54.65, 32:08:05.6 as a photometric
reference (Ic = 18.38), we measure for this source a preliminary (Vega)
magnitude of Ic = 20.3 +/- 0.2 mag.
We note, however, that the DSS2 red shows a faint source at the central
position of the enhanced XRT error circle at roughly the same coordinates.
Given that the seeing in our images is about 2 arcsec, and given that our
images are not substantially deeper than the DSS2 red, we cannot decide
whether we see this faint source or a faint transient on top of it. In any
case, at the time of our observations any optical transient was fainter
than about Ic=20.