NOTE: uvot_fluxes_wget.pl vrs. 2018-11-07 fem at 191101d05h24m31s509853usUT
NOTE: Source region spec. is: 115.87050 -62.32467 4"
NOTE: Used archived XRT position of 115.87050 -62.32467  4.00
NOTE: position reference is GCN_Circulars-26115
NOTE: Possible detection in wh at T+91.0

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

GRB 191031C: Swift/UVOT Upper Limits

J. D. Gropp (PSU) and Ambrosi (INAF-IASFPA)
report on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 191031C
91 s after the BAT trigger (Ambrosi et al., GCN Circ. 26108).
No optical afterglow consistent with the XRT position
(Goad et al. GCN Circ. 26115)
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            91          241          147         >20.0
u_FC               305          555          246         >19.6
white               91         1010          295         >20.5
u                  305          555          246         >19.6

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.17 in the direction of the burst
(Schlegel et al. 1998).


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

GRB 191031C: Swift/UVOT Detection

J. D. Gropp (PSU) and Ambrosi (INAF-IASFPA)
report on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 191031C
91 s after the BAT trigger (Ambrosi et al., GCN Circ. 26108).
A source consistent with the XRT position
(Goad et al. GCN Circ. 26115)
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               91          241          147         20.70 +/- 0.29
u                  305          555          246        >19.6

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.17 in the direction of the burst
(Schlegel et al. 1998).