NOTE: uvot_fluxes_wget.pl vrs. 2024-08-27 fem at 250706d22h27m58s924714usUT
NOTE: Source region spec. is: 284.0175 +32.3211 4"
NOTE: Used archived XRT position of 284.01750  32.32110  4.00
NOTE: position reference is GCN_Notice
NOTE: Possible detection in vv at T+453.1

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

GRB 250706A: Swift/UVOT Upper Limits

***UBS*** (***INSTITUTION***) and M. J. Moss (GSFC)
report on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 250706A
147 s after the BAT trigger (Moss et al., GCN Circ. 40988).
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

u_FC               147          397          246         >19.5
v                  453          473           19         >16.8
b                  403          423           19         >18.0
u                  147          397          246         >19.5
w1                 502          509            6         >18.2
m2                 477          497           19         >17.9
w2                 429          449           19         >19.9

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.093 in the direction of the burst
(Schlegel et al. 1998).


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

GRB 250706A: Swift/UVOT Detection

***UBS*** (***INSTITUTION***) and M. J. Moss (GSFC)
report on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 250706A
147 s after the BAT trigger (Moss et al., GCN Circ. 40988).
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

v                  453          473           19         17.49 +/- 0.28
b                  403          423           19        >18.0
u                  147          397          246        >19.5
w1                 502          509            6        >18.2
m2                 477          497           19        >17.9
w2                 429          449           19        >19.9

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.093 in the direction of the burst
(Schlegel et al. 1998).