NOTE: uvot_fluxes_wget.pl vrs. 2020-11-03a fem at 220305d21h20m05s920609usUT
NOTE: Source region spec. is: 107.59854 -37.68033 4"
NOTE: Used archived XRT position of 107.59854 -37.68033  4.00
NOTE: position reference is GCN_Circulars-31688
NOTE: Possible detection in wh at T+4202.9 sum

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

GRB 220305A: Swift/UVOT Upper Limits

M. A. Baer (PSU) and Caputo (GSFC)
report on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 220305A
3021 s after the BAT trigger (Caputo et al., GCN Circ. 31684).
No optical afterglow consistent with the XRT position
(Beardmore et al. GCN Circ. 31688)
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          3021         3171          147         >20.0
white             3021         4403          344         >20.4
v                 3178         4752          332         >19.6
b                 3998         4198          197         >19.9
u                 3793         3993          197         >19.9
w1                3588         3788          197         >20.2
m2                3383         3583          197         >20.0
w2                4410         4610          197         >20.1

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.418 in the direction of the burst
(Schlegel et al. 1998).


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

GRB 220305A: Swift/UVOT Detection

M. A. Baer (PSU) and Caputo (GSFC)
report on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 220305A
3021 s after the BAT trigger (Caputo et al., GCN Circ. 31684).
A source consistent with the XRT position
(Beardmore et al. GCN Circ. 31688)
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             3021         4403          344         21.14 +/- 0.32
v                 3178         4752          332        >19.6
b                 3998         4198          197        >19.9
u                 3793         3993          197        >19.9
w1                3588         3788          197        >20.2
m2                3383         3583          197        >20.0
w2                4410         4610          197        >20.1

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.418 in the direction of the burst
(Schlegel et al. 1998).