=========== Draft Upper Limit Circular ========

GRB 120821: Swift/UVOT Upper Limits

***UBS*** (***INSTITUTION***) and ***BA*** (***BA_INSTITUTION***)
report on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 120821
15246 s after the INTEGRAL trigger (Mereghetti et al., GCN Circ. 13696).
No optical afterglow consistent with the INTEGRAL position
*** POSITION REFERENCE is GCN_Circ_13696 ***
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

u                17059        17241          179         >19.7
w1               16153        17053          886         >20.4
m2               15246        16146          886         >20.5

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 35.63 in the direction of the burst
(Schlegel et al. 1998).