[vsnet-grb-info 6766] GRB 081012: Swift/UVOT analysis of initial observations

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  8365
SUBJECT: GRB 081012: Swift/UVOT analysis of initial observations
DATE:    08/10/12 20:33:06 GMT
FROM:    Paul Kuin at MSSL  <npkuin at googlemail.com>

N. P. M. Kuin (MSSL/UCL) and M.C. Stroh (PSU) report on behalf of
the Swift UVOT team.

The Swift UltraViolet/Optical Telescope (UVOT) began observations of
GRB081012 (Swift BAT trigger number 331475, Stroh et al., GCN Circ.
8361), on October 12, 2008, at 14:02:28 ,52 minutes after the
trigger.

We do not detect any new source at the XRT position reported in GCN
Circ. 8364 (Kennea et al.).

The magnitude upper limits for detecting GRB081012 at the XTR position
are given below for the first observations in the UVOT filters:

Filter Tstart(s) Tstop(s)  Exp(s)  Magnitude

uvw2   3125      3325     196.6    >20.09  (3-sigma UL)
v      3329      3458     125.8    >19.12  (3-sigma UL)
uvm2   4876      5076     196.6    >19.72  (3-sigma UL)
uvw1   5082      5282     196.6    >19.94  (3-sigma UL)
u      5287      5487     196.6    >20.00  (3-sigma UL)
b      5492      5692     196.6    >20.33  (3-sigma UL)
wh     5697      5713      15.7    >19.42  (3-sigma UL)

The values quoted above are on the UVOT Photometric System
(Poole et al, 2008, MNRAS 383,627). They are not corrected for the
expected galactic reddening of E(B-V) = 0.023 in the direction of
the burst (Schlegel et al. 1998).