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

GRB 150202B: Swift/UVOT Upper Limits

A. A. Breeveld (UCL-MSSL) and M. H. Siegel (PSU)
report on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 150202B
101141 s after the LAT trigger (***Author*** et al., GCN Circ. ????).
No optical afterglow consistent with the XRT position
(Sbarufatti et al. GCN Circ. 17405)
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

b               102960       103622          644         >21.3
u               102048       102955          885         >21.1
w1              101141       102041          886         >20.8
m2              106840       107347          499         >20.5

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.256 in the direction of the burst
(Schlegel et al. 1998).