[vsnet-grb-info 8803] GRB 091230: Swift/UVOT Observations

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  10302
SUBJECT: GRB 091230: Swift/UVOT Observations
DATE:    09/12/31 18:50:34 GMT
FROM:    Mike Siegel at PSU/Swift MOC  <siegel at astro.psu.edu>

M. H. Siegel (PSU) and H. A. Krimm (CRESST/GSFC/USRA)
report on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB
091230 32291 s after the Integral detection (Gotz et al., GCN
Circ. 10298).  We do not detect the afterglow reported by GROND
(Filgas et al., GCN Circ. 10299) and Swift-XRT (Beardmore et al.,
GCN Cic. 10300).

Preliminary 3-sigma upper limits are:

FILTER     T_start(s)  T_stop    Exposure     Mag/3UL
=============================================================
white      32291        42824     3898        >22.2

The above magnitudes are not corrected for the Galactic extinction
corresponding to a reddening of E_{B-V} = 0.36 (Schlegel et al.,
1998, ApJS, 500, 525). The photometry is on the UVOT photometric
system described in Poole et al. (2008, MNRAS, 383, 627).