NOTE: uvot_fluxes_wget.pl vrs. 2024-08-27 fem at 251016d15h03m07s788998usUT
NOTE: Source region spec. is: 245.007 -54.853 3"
NOTE: Used archived BAT position of 245.00700 -54.85300
NOTE: position reference is GCN_Position_Notice

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

GRB 251015: 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 251015
368 s after the BAT trigger (***Author*** et al., GCN Circ. ????).
No optical afterglow consistent with the BAT position
*** POSITION REFERENCE is GCN_Position_Notice ***
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              468         1195          225         >20.1
v                  518         1245           78         >17.8
b                  443         1170           78         >18.7
u                  418         1313           91         >18.5
w1                 393         1295           97         >18.4
m2                 368         1270           97         >18.5
w2                 494         1220           97         >18.6

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.656 in the direction of the burst
(Schlegel et al. 1998).