NOTE: uvot_fluxes_wget.pl vrs. 2020-11-03a fem at 210306d11h13m45s383788usUT
NOTE: Source region spec. is: 319.80762 34.55439 4"
NOTE: Used archived XRT position of 319.80762  34.55439  4.00
NOTE: position reference is GCN_Circulars-29595
NOTE: Possible detection in uu at T+297.6
NOTE: Possible detection in wh at T+85.4
NOTE: Possible detection in bb at T+1155.5 sum

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

GRB 210305A: Swift/UVOT Upper Limits

A. Belles (PSU) and A. D'Ai (INAF-IASFPA)
report on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 210305A
85 s after the BAT trigger (D'Ai et al., GCN Circ. 29595).
No optical afterglow consistent with the XRT position
(D'Ai et al. GCN Circ. 29595)
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 first
finding chart (FC) exposure and subsequent exposures are:

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

white_FC            85          235          148         >19.3
u_FC               298          547          246         >18.7
white               85         1721          412         >19.9
v                  627         1771          134         >17.9
b                  553         1696          117         >18.6
u                  298         1671          343         >18.8
w1                 676         1818          134         >19.1
m2                 651         1795          136         >19.4
w2                 603         1746          136         >19.1

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.155 in the direction of the burst
(Schlegel et al. 1998).


=========== Draft Detection Circular ========

GRB 210305A: Swift/UVOT Detection

A. Belles (PSU) and A. D'Ai (INAF-IASFPA)
report on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 210305A
85 s after the BAT trigger (D'Ai et al., GCN Circ. 29595).
A source consistent with the XRT position
(D'Ai et al. GCN Circ. 29595)
is detected in the initial UVOT exposures.

Preliminary detections and 3-sigma upper limits using the UVOT photometric system
(Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) for the early exposures are: 

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

white               85          597          167         19.94 +/- 0.22
v                  627         1771          134        >17.9
b                  553         1175           58         18.89 +/- 0.28
u                  298         1496          324         19.30 +/- 0.23
w1                 676         1818          134        >19.1
m2                 651         1795          136        >19.4
w2                 603         1746          136        >19.1

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.155 in the direction of the burst
(Schlegel et al. 1998).