NOTE: uvot_fluxes_wget.pl vrs. 2024-08-27 fem at 260101d10h38m55s937578usUT
NOTE: Source region spec. is: 86.42890 63.59225 3"
NOTE: Used archived uvot source position of  86.42890  63.59225  3.00
NOTE: position reference is GCN_Circ_43285
NOTE: A UVOT position was reported in GCN_Circ_43285
NOTE: Possible detection in uu at T+144.3
NOTE: Possible detection in vv at T+450.4
NOTE: Possible detection in bb at T+399.7

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

GRB 260101A: Swift/UVOT Upper Limits

M. H. Siegel (PSU) and S. B. Cenko (GSFC)
report on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 260101A
144 s after the BAT trigger (Cenko et al., GCN Circ. 43285).
No optical afterglow consistent with the XRT position
*** POSITION REFERENCE is GCN_Circulars-43289 ***
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               144          394          246         >15.9
v                  450         1550          136         >16.4
b                  400         1648          175         >17.1
u                  144         1624          529         >16.4
w1                 500         1599          136         >19.1
m2                 475         1424           78         >18.8
w2                 426         1525          136         >19.4

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.179 in the direction of the burst
(Schlegel et al. 1998).


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

GRB 260101A: Swift/UVOT Detection

M. H. Siegel (PSU) and S. B. Cenko (GSFC)
report on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 260101A
144 s after the BAT trigger (Cenko et al., GCN Circ. 43285).
A source consistent with the XRT position
*** POSITION REFERENCE is GCN_Circulars-43289 ***
is detected in the initial UVOT exposures.

The preliminary UVOT position is:
    RA  (J2000) =  05:45:42.96 =  86.42898 (deg.)
    Dec (J2000) = +63:35:32.1  =  63.59226 (deg.)
with an estimated uncertainty of 0.43 arc sec. (radius, 90% confidence).

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                  450          470           20         16.13 +/- 0.13
b                  400          420           20         16.55 +/- 0.09
u                  144          394          246         16.03 +/- 0.03
w1                 500         1599          136        >19.1
m2                 475         1424           78        >18.8
w2                 426         1525          136        >19.4

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.179 in the direction of the burst
(Schlegel et al. 1998).