NOTE: uvot_fluxes_wget.pl vrs. 2018-01-16 fem at 180225d02h21m05s171174usUT
NOTE: Source region spec. is: 202.68370 38.07906 3"
NOTE: Used archived uvot source position of 202.68370  38.07906  3.00
NOTE: position reference is GCN_Circ_22442
NOTE: A UVOT position was reported in GCN_Circ_22442
NOTE: Possible detection in wh at T+85.1

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

GRB 180224A: Swift/UVOT Upper Limits

S. J. LaPorte (PSU) and A. Y. Lien (GSFC/UMBC)
report on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 180224A
85 s after the BAT trigger (Lien et al., GCN Circ. 22442).
No optical afterglow consistent with the XRT position
(Evans et al. GCN Circ. 22443)
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            85          235          147         >18.8
u_FC               297          547          246         >20.3
white               85         5361          435         >19.7
v                  627         1422           97         >18.4
b                  552         5293          274         >20.6
u                  297         5088          501         >20.8
w1                 676         1470           97         >19.7
w2                 775          795           19         >18.9

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.01 in the direction of the burst
(Schlegel et al. 1998).


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

GRB 180224A: Swift/UVOT Detection

S. J. LaPorte (PSU) and A. Y. Lien (GSFC/UMBC)
report on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 180224A
85 s after the BAT trigger (Lien et al., GCN Circ. 22442).
A source consistent with the XRT position
(Evans et al. GCN Circ. 22443)
is detected in the initial UVOT exposures.

The preliminary UVOT position is:
    RA  (J2000) =  13:30:44.10 = 202.68377 (deg.)
    Dec (J2000) = +38:04:44.5  =  38.07902 (deg.)
with an estimated uncertainty of 0.46 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               85          235          147         19.05 +/- 0.07
v                  627         1422           97        >18.4
b                  552         5293          274        >20.6
u                  297         5088          501        >20.8
w1                 676         1470           97        >19.7
w2                 775          795           19        >18.9

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.01 in the direction of the burst
(Schlegel et al. 1998).