NOTE: uvot_fluxes_wget.pl vrs. 2024-08-27 fem at 261018d09h44m55s548102usUT
NOTE: Source region spec. is: 139.90346 12.63778 4"
NOTE: Used archived XRT position of 139.90346  12.63778  4.00
NOTE: position reference is GCN_Circulars-45977
NOTE: Possible detection in wh at T+89.5

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

GRB 261017A: Swift/UVOT Upper Limits

***UBS*** (***INSTITUTION***) and M. H. Siegel (PSU)
report on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 261017A
90 s after the BAT trigger (Siegel et al., GCN Circ. 45974).
No optical afterglow consistent with the XRT position
*** POSITION REFERENCE is GCN_Circulars-45977 ***
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         >19.6
u_FC               302          551          246         >18.8
white               90         1377          373         >19.8
v                  631         1427           97         >18.6
b                  557         5666          198         >19.2
u                  302         5538          501         >19.2
w1                 680         1304           78         >18.5

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


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

GRB 261017A: Swift/UVOT Detection

***UBS*** (***INSTITUTION***) and M. H. Siegel (PSU)
report on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 261017A
90 s after the BAT trigger (Siegel et al., GCN Circ. 45974).
A source consistent with the XRT position
*** POSITION REFERENCE is GCN_Circulars-45977 ***
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         1377          373         20.41 +/- 0.24
v                  631         1427           97        >18.6
b                  557         5666          198        >19.2
u                  302         5538          501        >19.2
w1                 680         1304           78        >18.5

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