NOTE: uvot_fluxes_wget.pl vrs. 2024-08-27 fem at 260121d14h30m14s286331usUT
NOTE: Source region spec. is: 284.6600 +61.9052 3"
NOTE: Used archived uvot source position of 284.66000  61.90520  3.00
NOTE: position reference is GCN_Notice
NOTE: A UVOT position was reported in GCN_Notice_Tue_20_Jan_26_18:24:54_UT
NOTE: Possible detection in wh at T+149.3
NOTE: Possible detection in uu at T+307.4

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

GRB 260120B: Swift/UVOT Upper Limits

***UBS*** (***INSTITUTION***) and Ferro (INAF-OAB)
report on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 260120B
149 s after the BAT trigger (Ferro et al., GCN Circ. 43479).
No optical afterglow consistent with the XRT position
*** POSITION REFERENCE is GCN_Circulars-43484 ***
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           149          299          147         >18.2
u_FC               307          557          246         >18.3
white              149          776          183         >18.4
v                  637         5760          216         >19.1
b                  563          755           39         >18.7
u                  307         6275          363         >18.6
w1                 686         6170          216         >19.1
m2                 661         5965          216         >19.1
w2                 613         5554          216         >19.3

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.063 in the direction of the burst
(Schlegel et al. 1998).


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

GRB 260120B: Swift/UVOT Detection

***UBS*** (***INSTITUTION***) and Ferro (INAF-OAB)
report on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 260120B
149 s after the BAT trigger (Ferro et al., GCN Circ. 43479).
A source consistent with the XRT position
*** POSITION REFERENCE is GCN_Circulars-43484 ***
is detected in the initial UVOT exposures.

The preliminary UVOT position is:
    RA  (J2000) =  18:58:38.41 = 284.66006 (deg.)
    Dec (J2000) = +61:54:18.4  =  61.90511 (deg.)
with an estimated uncertainty of 0.45 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

white              149          299          147         18.37 +/- 0.06
v                  637         5760          216        >19.1
b                  563          755           39        >18.7
u                  307          557          246         18.70 +/- 0.14
w1                 686         6170          216        >19.1
m2                 661         5965          216        >19.1
w2                 613         5554          216        >19.3

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.063 in the direction of the burst
(Schlegel et al. 1998).