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GCN Circular 24014

Subject
GRB 190324A: Swift/UVOT Observations
Date
2019-03-26T16:50:58Z (5 years ago)
From
Mike Siegel at PSU/Swift MOC <mhs18@psu.edu>
M. H. Siegel (PSU) and S. J. LaPorte (PSU)
report on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 190324A
3302 s after the BAT trigger (LaPorte et al., GCN Circ. 23993).
A fading source consistent with the XRT position
(Beardmore et al. GCN Circ. 24001) is detected in the initial UVOT exposures,
consistent with the initial report of Marshall (GCN Circ. 23996).

The preliminary UVOT position is:
   RA  (J2000) =  03:18:27.74 =  49.61559 (deg.)
   Dec (J2000) = -47:12:52.6  = -47.21462 (deg.)
with an estimated uncertainty of 0.43 arc sec. (radius, 90% confidence).

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             3302         3452          147         17.23 +/- 0.04
white            33037        33944          885         19.65 +/- 0.07
white           101768       119129          386        >20.79
v                 3459         3659          197         17.55 +/- 0.11
v                28515        39157          496        >19.48
b                 4281         4481          197         17.98 +/- 0.07
b                10929        11267          329         18.74 +/- 0.08
b                32125        44180         1489         20.65 +/- 0.34
b               101621       118983          386        >20.13
u                 4075         4275          197         16.75 +/- 0.05
u                10016        10923          885         17.78 +/- 0.05
u                22022        22836          792         18.86 +/- 0.08
u               101474       118836          386        >19.68
uvw1              3870         4070          197         16.76 +/- 0.07
uvw1              9110        10010          885         17.65 +/- 0.07
uvw1             20525        21097          563         18.68 +/- 0.16
uvm2              3664         3864          197         16.79 +/- 0.09
uvm2             14888        15397          501         18.37 +/- 0.13
uvw2              4692         4892          197         17.82 +/- 0.12
uvw2             26341        38706         2052         19.76 +/- 0.15

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.02 in the direction of the burst
(Schlegel et al. 1998).
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