NOTE: uvot_fluxes_wget.pl vrs. 2018-01-16 fem at 180312d13h55m59s800846usUT
NOTE: Source region spec. is: 275.0895 +7.1832 4"
NOTE: Used archived XRT position of 275.08950   7.18320  4.00
NOTE: position reference is GCN_Notice
NOTE: Possible detection in uu at T+1616.3
NOTE: Possible detection in wh at T+1837.8 sum
NOTE: Possible detection in bb at T+6116.2
NOTE: Possible detection in w1 at T+1764.3
NOTE: Possible detection in vv at T+6731.9
NOTE: Possible detection in w2 at T+1863.1 sum
NOTE: Possible detection in m2 at T+1911.9 sum

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

GRB 180312: Swift/UVOT Upper Limits

F. E. Marshall (NASA/GSFC) and ***BA*** (***BA INSTITUTION***)
report on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 180312
1212 s after the BAT trigger (***Author*** et al., GCN Circ. ????).
No optical afterglow consistent with the XRT position
*** POSITION REFERENCE is GCN_Notice ***
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          1212         1362          147         >20.0
white             1212         7957          657         >20.8
v                 1369        12340         1227         >18.1
b                 1469         7751          510         >19.2
u                 1444         7546          510         >18.3
w1                1419        13915         1163         >17.7
m2                1394        13245         1206         >17.8
w2                1518         8162          510         >17.8

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.23 in the direction of the burst
(Schlegel et al. 1998).


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

GRB 180312: Swift/UVOT Detection

F. E. Marshall (NASA/GSFC) and ***BA*** (***BA INSTITUTION***)
report on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 180312
1212 s after the BAT trigger (***Author*** et al., GCN Circ. ????).
A source consistent with the XRT position
*** POSITION REFERENCE is GCN_Notice ***
is detected in the initial UVOT exposures.

Preliminary detections 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             6321         6521          197         20.14 +/- 0.20
v                11433        11733          295         17.93 +/- 0.12
b                 6116         6316          197         19.06 +/- 0.15
u                 5911         6111          197         18.28 +/- 0.12
w1                1419         2302          117         17.86 +/- 0.18
m2                1394         7136          321         18.20 +/- 0.16
w2                6527         6727          197         18.05 +/- 0.16

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.23 in the direction of the burst
(Schlegel et al. 1998).