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GCN Circular 12610

Subject

GRB 111201A: Swift/UVOT Upper Limits

Date

2011-12-02T14:45:05Z (12 years ago)

From

Paul Kuin at MSSL <npkuin@gmail.com>

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

The Swift/UVOT began settled observations of the field of GRB 111201A
26513 s after the BAT trigger (Sakamoto et al., GCN Circ. 12608Not found
 
 
).
No optical afterglow consistent with the XRT position  (Kennea and
Sakamoto, GCN Circ. 12609Not found
 
 
) is detected in the initial UVOT exposures.
Preliminary 3-sigma upper limits using the UVOT photometric system
(Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) for the initial
exposures are:

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

white            26513        32667         2746         >22.6

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.02 in the direction of the burst
(Schlegel et al. 1998)