NOTE: uvot_fluxes_wget.pl vrs. 2024-08-27 fem at 251008d06h47m04s436167usUT
NOTE: Source region spec. is: 102.13233 -10.30328 4"
NOTE: Used archived XRT position of 102.13233 -10.30328  4.00
NOTE: position reference is GCN_Circulars-42147
NOTE: Possible detection in wh at T+591.5 sum

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

GRB 251007B: Swift/UVOT Upper Limits

***UBS*** (***INSTITUTION***) and A. Melandri (INAF-OAR)
report on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 251007B
152 s after the BAT trigger (Melandri et al., GCN Circ. 42147).
No optical afterglow consistent with the XRT position
*** POSITION REFERENCE is GCN_Circulars-42147 ***
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           152          302          147         >19.8
u_FC               311          561          246         >19.1
white              152         5220          220         >19.9
v                  641         4360          220         >19.2
b                  567         5181          236         >20.3
u                  311         4975          462         >19.5
w1                 691         4770          216         >19.8
m2                 665         4565          216         >19.5
w2                 616          810           39         >18.2

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.786 in the direction of the burst
(Schlegel et al. 1998).


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

GRB 251007B: Swift/UVOT Detection

***UBS*** (***INSTITUTION***) and A. Melandri (INAF-OAR)
report on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 251007B
152 s after the BAT trigger (Melandri et al., GCN Circ. 42147).
A source consistent with the XRT position
*** POSITION REFERENCE is GCN_Circulars-42147 ***
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              152          611          167         20.45 +/- 0.31
v                  641         4360          220        >19.2
b                  567         5181          236        >20.3
u                  311         4975          462        >19.5
w1                 691         4770          216        >19.8
m2                 665         4565          216        >19.5
w2                 616          810           39        >18.2

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.786 in the direction of the burst
(Schlegel et al. 1998).