NOTE: uvot_fluxes_wget.pl vrs. 2024-08-27 fem at 240912d12h28m32s949712usUT
NOTE: Source region spec. is: 124.63502 33.99896 3"
NOTE: Used archived uvot source position of 124.63502  33.99896  3.00
NOTE: position reference is GCN_Circ_37466
NOTE: A UVOT position was reported in GCN_Circ_37466
NOTE: Possible detection in wh at T+115.3
NOTE: Possible detection in w2 at T+1036.7 sum
NOTE: Possible detection in vv at T+829.5
NOTE: Possible detection in bb at T+582.5
NOTE: Possible detection in uu at T+327.3
NOTE: Possible detection in w1 at T+706.2

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

GRB 240912A: Swift/UVOT Upper Limits

***UBS*** (***INSTITUTION***) and P. A. Evans (U. Leicester)
report on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 240912A
115 s after the BAT trigger (Evans et al., GCN Circ. 37466).
No optical afterglow consistent with the XRT position
*** POSITION REFERENCE is GCN_Circulars-37470 ***
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           115          265          147         >17.4
u_FC               327          577          246         >16.6
white              115         1204          353         >17.6
v                  657         1429           97         >17.3
b                  582         5153          206         >18.5
u                  327         5018          442         >17.1
w1                 706         1479           78         >17.2
m2                1086         1105           19         >17.0
w2                 632         1405           97         >17.9

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.054 in the direction of the burst
(Schlegel et al. 1998).


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

GRB 240912A: Swift/UVOT Detection

***UBS*** (***INSTITUTION***) and P. A. Evans (U. Leicester)
report on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 240912A
115 s after the BAT trigger (Evans et al., GCN Circ. 37466).
A source consistent with the XRT position
*** POSITION REFERENCE is GCN_Circulars-37470 ***
is detected in the initial UVOT exposures.

The preliminary UVOT position is:
    RA  (J2000) =  08:18:32.40 = 124.63499 (deg.)
    Dec (J2000) = +33:59:56.3  =  33.99897 (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

white              115          265          147         17.47 +/- 0.04
v                  657         1429           97         17.84 +/- 0.20
b                  582          775           39         17.90 +/- 0.16
u                  327          577          246         16.74 +/- 0.05
w1                 706         1304           58         17.45 +/- 0.18
m2                1086         1105           19        >17.0
w2                 632         1405           97         18.47 +/- 0.24

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.054 in the direction of the burst
(Schlegel et al. 1998).