NOTE: uvot_fluxes_wget.pl vrs. 2023-03-23 fem at 240305d18h02m42s067646usUT
NOTE: Source region spec. is: 229.7317 -57.3641 4"
NOTE: Used archived XRT position of 229.73170 -57.36410  4.00
NOTE: position reference is GCN_Notice
NOTE: Possible detection in uu at T+867.1

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

GRB 240305: Swift/UVOT Upper Limits

N. J. Klingler (GSFC/UMBC/CRESTII) and ***BA*** (***BA INSTITUTION***)
report on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 240305
283 s after the BAT trigger (***Author*** et al., GCN Circ. ????).
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          4934         5084          147         >20.3
u_FC               283          533          246         >20.2
white             4934         5084          147         >20.3
v                  591         1242           78         >18.5
b                  541         1191           97         >19.7
u                  283         6400          609         >20.0
w1                 640         6195          255         >19.8
m2                 765         5191          137         >19.3
w2                 567         1217           58         >18.9

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 8.219 in the direction of the burst
(Schlegel et al. 1998).


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

GRB 240305: Swift/UVOT Detection

N. J. Klingler (GSFC/UMBC/CRESTII) and ***BA*** (***BA INSTITUTION***)
report on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 240305
283 s after the BAT trigger (***Author*** et al., GCN Circ. ????).
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             4934         5084          147        >20.3
v                  591         1242           78        >18.5
b                  541         1191           97        >19.7
u                  867         1017          147         19.51 +/- 0.32
w1                 640         6195          255        >19.8
m2                 765         5191          137        >19.3
w2                 567         1217           58        >18.9

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 8.219 in the direction of the burst
(Schlegel et al. 1998).