NOTE: uvot_fluxes_wget.pl vrs. 2018-11-07 fem at 200108d10h53m05s072399usUT
NOTE: Source region spec. is: 106.90658 -83.71861 3"
NOTE: Used archived opt source position of 106.90658 -83.71861  3.00
NOTE: position reference is GCN_Circulars-26660
NOTE: Possible detection in wh at T+902.7
NOTE: Possible detection in vv at T+1059.3
WARNING: Did not recognize UBS name.

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

GRB 200107B: Swift/UVOT Upper Limits

PSU (***INSTITUTION***) and M. G. Bernardini (INAF-OAB)
report on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 200107B
903 s after the BAT trigger (Bernardini et al., GCN Circ. 26661).
No optical afterglow consistent with the optical position
( GCN Circ. 26660)
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           903         1052          147         >19.4
white              903         7074          364         >19.0
v                 1059         7300           52         >17.6
b                 1157         6870          216         >19.1
u                 1133         3144          179         >19.7
w1                2777         2976          197         >19.5
w2                1208         1228           19         >18.2

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.19 in the direction of the burst
(Schlegel et al. 1998).


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

GRB 200107B: Swift/UVOT Detection

PSU (***INSTITUTION***) and M. G. Bernardini (INAF-OAB)
report on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 200107B
903 s after the BAT trigger (Bernardini et al., GCN Circ. 26661).
A source consistent with the optical position
( GCN Circ. 26660)
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             6875         7074          197         18.89 +/- 0.09
v                 1059         1079           19         17.20 +/- 0.29
b                 1157         6870          216        >19.1
u                 1133         3144          179        >19.7
w1                2777         2976          197        >19.5
w2                1208         1228           19        >18.2

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.19 in the direction of the burst
(Schlegel et al. 1998).