NOTE: uvot_fluxes_wget.pl vrs. 2020-11-03a fem at 210419d19h19m15s276430usUT
NOTE: Source region spec. is: 86.8540 -65.5033 4"
NOTE: Used archived XRT position of  86.85400 -65.50330  4.00
NOTE: position reference is GCN_Notice
NOTE: Possible detection in uu at T+294.4
NOTE: Possible detection in wh at T+136.5
NOTE: Possible detection in bb at T+726.2 sum
WARNING: t_start for light curve (119) and t_start from the exposure report (137) do not agree.
  Replace ??? in draft Circular with correct value.

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

GRB 210419A: Swift/UVOT Upper Limits

M. H. Siegel (PSU) and S. L. Laha (GSFC/UMBC/CRESST)
report on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 210419A
***???*** s after the BAT trigger (Laha et al., GCN Circ. 29828).
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           136          286          147         >18.1
u_FC               294          544          246         >17.9
white              136         1027          333         >18.1
v                  627         1079           58         >17.5
b                  550          746           39         >17.7
u                  294          721          265         >17.9
w1                 677          871           39         >17.8
m2                 651         1103           58         >18.3
w2                 119         1053           67         >19.3

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.075 in the direction of the burst
(Schlegel et al. 1998).


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

GRB 210419A: Swift/UVOT Detection

M. H. Siegel (PSU) and S. L. Laha (GSFC/UMBC/CRESST)
report on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 210419A
***???*** s after the BAT trigger (Laha et al., GCN Circ. 29828).
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              136          286          147         18.32 +/- 0.08
v                  627         1079           58        >17.5
b                  550          746           39         18.32 +/- 0.26
u                  294          544          246         18.23 +/- 0.13
w1                 677          871           39        >17.8
m2                 651         1103           58        >18.3
w2                 119         1053           67        >19.3

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.075 in the direction of the burst
(Schlegel et al. 1998).