NOTE: uvot_fluxes_wget.pl vrs. 2023-03-23 fem at 230506d21h21m39s276724usUT
NOTE: Source region spec. is: 326.97875 44.51108 4"
NOTE: Used archived XRT position of 326.97875  44.51108  4.00
NOTE: position reference is GCN_Circulars-33729
NOTE: Possible detection in wh at T+89.6
WARNING: Did not find t_start in exposure report.

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

GRB 230506B: Swift/UVOT Upper Limits

***UBS*** (***INSTITUTION***) and S. Dichiara (PSU)
report on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 230506B
90 s after the BAT trigger (Dichiara et al., GCN Circ. 33727).
No optical afterglow consistent with the XRT position
*** POSITION REFERENCE is GCN_Circulars-33729 ***
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            90          239          147         >19.8
u_FC               302          551          246         >19.7
white               90         1006          334         >20.0
v                  632         5117          236         >19.1
b                  557          751           39         >19.4
u                  302          726          265         >19.8
w1                 682         5493          183         >19.0
m2                 656         5322          236         >20.0
w2                 607         4912          255         >19.6

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.334 in the direction of the burst
(Schlegel et al. 1998).


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

GRB 230506B: Swift/UVOT Detection

***UBS*** (***INSTITUTION***) and S. Dichiara (PSU)
report on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 230506B
90 s after the BAT trigger (Dichiara et al., GCN Circ. 33727).
A source consistent with the XRT position
*** POSITION REFERENCE is GCN_Circulars-33729 ***
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               90         1006          334         20.56 +/- 0.22
v                  632         5117          236        >19.1
b                  557          751           39        >19.4
u                  302          726          265        >19.8
w1                 682         5493          183        >19.0
m2                 656         5322          236        >20.0
w2                 607         4912          255        >19.6

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.334 in the direction of the burst
(Schlegel et al. 1998).