NOTE: uvot_fluxes_wget.pl vrs. 2024-08-27 fem at 241129d05h38m00s430402usUT
NOTE: Source region spec. is: 273.72354 33.43914 4"
NOTE: Used archived XRT position of 273.72354  33.43914  4.00
NOTE: position reference is GCN_Circulars-38374
NOTE: Possible detection in wh at T+4449.1 sum

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

GRB 241128A: Swift/UVOT Upper Limits

S.P.R. Shilling (Lancaster) and Brivio (INAF-OAB)
report on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 241128A
3880 s after the BAT trigger (Brivio et al., GCN Circ. 38367).
No optical afterglow consistent with the XRT position
*** POSITION REFERENCE is GCN_Circulars-38374 ***
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          3880         4029          147         >19.5
white             3880         4649          344         >20.1
v                 4860         5059          197         >18.6
b                 4244         4444          197         >19.5
u                 4038         4238          197         >19.1
m2                5065        10054          534         >19.7
w2                4655         4855          197         >19.5

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.067 in the direction of the burst
(Schlegel et al. 1998).


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

GRB 241128A: Swift/UVOT Detection

S.P.R. Shilling (Lancaster) and Brivio (INAF-OAB)
report on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 241128A
3880 s after the BAT trigger (Brivio et al., GCN Circ. 38367).
A source consistent with the XRT position
*** POSITION REFERENCE is GCN_Circulars-38374 ***
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             3880         4649          344         20.80 +/- 0.31
v                 4860         5059          197        >18.6
b                 4244         4444          197        >19.5
u                 4038         4238          197        >19.1
m2                5065        10054          534        >19.7
w2                4655         4855          197        >19.5

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.067 in the direction of the burst
(Schlegel et al. 1998).