NOTE: uvot_fluxes_wget.pl vrs. 2020-11-03a fem at 220408d11h00m39s285860usUT
NOTE: Source region spec. is: 202.41548 47.06931 3"
NOTE: Used archived uvot source position of 202.41548  47.06931  3.00
NOTE: position reference is GCN_Circ_31848
NOTE: A UVOT position was reported in GCN_Circ_31848
NOTE: Possible detection in wh at T+112.5

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

GRB 220408A: Swift/UVOT Upper Limits

S. R. Oates (U.Birmingham) and Caputo (GSFC)
report on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 220408A
112 s after the BAT trigger (Caputo et al., GCN Circ. 31848).
No optical afterglow consistent with the XRT position
*** POSITION REFERENCE is GCN_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 first
finding chart (FC) exposure and subsequent exposures are:

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

white_FC           112          262          147         >20.0
u_FC               325          575          246         >20.1
white              112          799          186         >20.2
b                  581          774           39         >20.1
u                  325          575          246         >20.1

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.042 in the direction of the burst
(Schlegel et al. 1998).


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

GRB 220408A: Swift/UVOT Detection

S. R. Oates (U.Birmingham) and Caputo (GSFC)
report on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 220408A
112 s after the BAT trigger (Caputo et al., GCN Circ. 31848).
A source consistent with the XRT position
*** POSITION REFERENCE is GCN_Notice ***
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              112          262          147         20.49 +/- 0.17
b                  581          774           39        >20.1
u                  325          575          246        >20.1

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.042 in the direction of the burst
(Schlegel et al. 1998).