[vsnet-grb-info 9854] Subject: GRB 101008: Swift/UVOT Upper Limits

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  11322
SUBJECT: Subject: GRB 101008: Swift/UVOT Upper Limits
DATE:    10/10/08 23:55:17 GMT
FROM:    Paul Kuin at MSSL  <npkuin at gmail.com>

N.P.M. Kuin (MSSL/UCL) and W. H. Baumgartner (GSFC/UMBC)
report on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 101008
3167 s after the BAT trigger (Baumgartner et al., GCN Circ. 11318).
No optical afterglow consistent with the XRT position (Beardmore
et al., GCN Circ 11321) is detected in the initial UVOT exposures.
Preliminary 3-sigma upper limits using the UVOT photometric system
(Poole et al. 2008, MNRAS, 383, 627) for the first finding chart (FC)
exposure and subsequent exposures are:

Filter         T_start(s)   T_stop(s)      Exp(s)         Mag

white_FC          3167         3316          147         >20.6
white             3167         5372          541         >21.3
v                 4147         5752          363         >19.6
b                 3531         5167          393         >20.6
u                 3326         4962          393         >20.1
w1                4557         4757          197         >20.1
m2                4352         4552          197         >20.3
w2                3943         5577          393         >20.6

The values quoted above are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.19 in the direction of the burst
(Schlegel et al. 1998).