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GCN Circular 23725

Subject
GRB 190114C: Swift/UVOT Detection
Date
2019-01-15T19:59:02Z (5 years ago)
From
Mike Siegel at PSU/Swift MOC <mhs18@psu.edu>
M. H. Siegel (PSU) and J. D. Gropp (PSU)
report on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 190114C
74 s after the BAT trigger (Gropp et al., GCN Circ. 23688).
A source consistent with the XRT position
(Osborne et al. GCN Circ. 23704) and previously reported optical 
detections (Tyurina et al., GCN Circ. 23690, Selsing et al., GCN Circ. 23695,
Izzy et al., GCN Circ. 23699, Bolmer & Schady, GCN Circ. 23702, Im et al.,
GCN Circ. 23717) is detected in the initial UVOT exposures.

The preliminary UVOT position is:
   RA  (J2000) =  03:38:01.16 =  54.50484 (deg.)
   Dec (J2000) = -26:56:46.9  = -26.94637 (deg.)
with an estimated uncertainty of 0.42 arc sec. (radius, 90% confidence).

The data of the first few orbits shows the afterglow to fade rapidly, particularly
in the NUV filters, which could be consistent with the heavy extinction reported by
Kann et al. (GCN Circ. 23710).

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 (fc)          74          224          147      14.89+/-0.02
white              566          586           19      16.90+/-0.07
white             5851         6050          196      19.19+/-0.09
white            21950        22857          885      20.22+/-0.09
v                  616          627           10      16.28+/-0.19
v                16295        17136          820      18.97+/-0.13
v                26775        27682          885      19.41+/-0.24
v                39149        57221         1694      19.92+/-0.20
b                  542          561           19      17.38+/-0.14
b                 5646         5845          196      19.38+/-0.16
b                21038        46521         1591      20.83+/-0.26
u (fc)             286          536          245      17.58+/-0.07
u                33738        34038          295            >20.28
uvw1              4044        51522         3671      21.05+/-0.31
uvm2              3839        50615         3251      21.00+/-0.30
uvw2              6056        56384         3552            >21.33

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).
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