NOTE: uvot_fluxes_wget.pl vrs. 2018-11-07 fem at 200416d15h22m16s796136usUT
NOTE: Source region spec. is: 335.69929 -7.51831 3"
NOTE: Used archived uvot source position of 335.69929  -7.51831  3.00
NOTE: position reference is GCN_Circ_27591
NOTE: A UVOT position was reported in GCN_Circ_27591
NOTE: Possible detection in uu at T+314.4
NOTE: Possible detection in wh at T+102.3
NOTE: Possible detection in bb at T+570.1
NOTE: Possible detection in w1 at T+693.7
NOTE: Possible detection in vv at T+644.1

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

GRB 200416A: Swift/UVOT Upper Limits

K. K. Simpson (PSU) 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 200416A
102 s after the BAT trigger (Evans et al., GCN Circ. 27591).
No optical afterglow consistent with the XRT position
(Evans GCN Circ. 27594)
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           102          252          147         >16.5
u_FC               314          564          246         >16.3
white              102          781          179         >16.6
v                  644          664           19         >16.3
b                  570          764           39         >17.2
u                  314          738          265         >16.4
w1                 694          714           19         >16.0
m2                 668          688           19         >16.3
w2                 620          640           19         >17.5

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.06 in the direction of the burst
(Schlegel et al. 1998).


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

GRB 200416A: Swift/UVOT Detection

K. K. Simpson (PSU) 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 200416A
102 s after the BAT trigger (Evans et al., GCN Circ. 27591).
A source consistent with the XRT position
(Evans GCN Circ. 27594)
is detected in the initial UVOT exposures.

The preliminary UVOT position is:
    RA  (J2000) =  22:22:47.84 = 335.69934 (deg.)
    Dec (J2000) = -07:31:06.0  =  -7.51833 (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              102          252          147         16.57 +/- 0.03
v                  644          664           19         17.05 +/- 0.32
b                  570          590           20         17.48 +/- 0.20
u                  314          564          246         16.44 +/- 0.04
w1                 694          714           20         16.59 +/- 0.23
m2                 668          688           19        >16.3
w2                 620          640           19        >17.5

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.06 in the direction of the burst
(Schlegel et al. 1998).