[vsnet-grb-info 3753] GRB 060923: UKIRT nIR observations - candidate afterglow

[GCN Circulars]

TITLE:   GCN GRB OBSERVATION REPORT
NUMBER:  5587
SUBJECT: GRB 060923: UKIRT nIR observations - candidate afterglow
DATE:    06/09/23 07:57:00 GMT
FROM:    Nial Tanvir at IofA U.Cambridge  <nrt at ast.cam.ac.uk>

N. Tanvir (U. Leicester), A. Levan (U. Hertfordshire), M. Jarvis
(U. Oxford), T. Wold (JACH)

We observed the field of GRB 060923 with UFTI on UKIRT, beginning
at 06:07 (UT), approximately 55 minutes post-burst.  We detect a
faint source in the K-band image at approximately:

 16 58 28.18  +12 21 38.9

This position (based on provisional astrometry) is only 4.6 arcsec
from the reported XRT position (Stamatikos et al. GCN 5583).
The source appears to have faded in another (shallower) K-band
observation made 30 mins later, and therefore is likely to be
the afterglow of this burst.

Further analysis is ongoing.