GCN Circular 8621
Subject
GRB 081204: Swift/UVOT Upper Limits
Event
Date
2008-12-05T14:17:38Z (18 years ago)
From
Peter Curran at MSSL <pac@mssl.ucl.ac.uk>
P.A. Curran (UCL-MSSL) and W. Baumgartner (GSFC)
report on behalf of the Swift/UVOT team:
The Swift Ultra-Violet/Optical Telescope (UVOT) began settled ToO
observations of the INTEGRAL-IBAS localised GRB 081204 (Gotz et al.,
GCN 8614) ~ 3 hours after the event. The field was observed with the
white filter only. No afterglow is detected within the 7" XRT position
(Mangano et al., GCN 8616) in the co-added image, down to the following
3-sigma limiting magnitude:
Filter T_start(s) Exp(s) Mag UL (3sig)
-----------------------------------
white 1.01e4 3.4e3 > 22.04
-----------------------------------
There is a DSS detected object approximately 11" south-west of the
center of the XRT position with an observed white magnitide of ~20.5.
The values quoted above are in the UVOT photometric system (Poole et al.
2008, MNRAS, 383, 627); they are not corrected for the expected Galactic
extinction along the line of sight which corresponds to a reddening of
E(B-V)=0.027 mag (Schlegel et al. 1998).
[GCN OPS NOTE(05dec08): Per author's request, the typo for T_start
in the table was changed from 1.01e5 to 1.01e4.]