GCN Circular 10008
Subject
GRB 091010: GROND afterglow candidate
Date
2009-10-11T04:11:35Z (15 years ago)
From
Andrea Rossi at TLS Tautenburg <rossi@tls-tautenburg.de>
A. Rossi (Tautenburg), A. Rau, P. Afonso and J. Greiner (all MPE),
report on behalf of the GROND team:
Starting October 10 at 23h45 UT (21.03hrs post-burst) GROND (Greiner et
al. 2008, PASP 120, 405) mounted at the 2.2m ESO/MPI telescope
at La Silla Observatory (Chile) imaged the field of GRB 091010
(Donnarumma et al., GCN #10004) simultaneously in the g'r'i'z'JHK bands.
Within the Swift-XRT circle (Margutti et al., GCN #10006) we find a
single source at:
RA(J2000): 19:54:39.80
DEC(J2000): -22:31:03.9
with uncertainties of 0.5" in each coordinate.
The object is detected in the r' band with a preliminary AB magnitude of
~22.2 calibrated against the GROND photometric zero point. No correction
for Galactic foreground extinction of E(B-V)=0.14mag (Schlegel et al.
1998, Apj, 500, 525) was applied. Strongly variable sky conditions and
high seeing >2.5 arcsec) prevent reliable detections in others bands.