NOTE: uvot_fluxes_wget.pl vrs. 2020-11-03a fem at 220413d01h30m42s492902usUT
NOTE: Source region spec. is: 123.96728 +30.34269 3"
NOTE: Used archived opt source position of 123.96728  30.34269  3.00
NOTE: position reference is GCN_Circ-31882
NOTE: Possible detection in wh at T+863.2

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

GRB 220412A: Swift/UVOT Upper Limits

A. A. Breeveld (UCL-MSSL) and N. J. Klingler (GSFC/UMBC/CRESSTII)
report on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 220412A
127 s after the BAT trigger (Klingler et al., GCN Circ. 31881).
No optical afterglow consistent with the optical position
*** POSITION REFERENCE is GCN_Circ-31882 ***
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           127          276          147         >20.9
u_FC               285          534          246         >20.4
white              127         1013          295         >20.7
u                  285          534          246         >20.4

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.037 in the direction of the burst
(Schlegel et al. 1998).


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

GRB 220412A: Swift/UVOT Detection

A. A. Breeveld (UCL-MSSL) and N. J. Klingler (GSFC/UMBC/CRESSTII)
report on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 220412A
127 s after the BAT trigger (Klingler et al., GCN Circ. 31881).
A source consistent with the optical position
*** POSITION REFERENCE is GCN_Circ-31882 ***
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              863         1013          147         20.87 +/- 0.32
u                  285          534          246        >20.4

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.037 in the direction of the burst
(Schlegel et al. 1998).