[vsnet-grb-info 22844] GRB 190630B: Swift/UVOT Upper Limits

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  24943
SUBJECT: GRB 190630B: Swift/UVOT Upper Limits
DATE:    19/07/01 17:59:50 GMT
FROM:    Kira Simpson at PSU  <kira.simpson1984 at gmail.com>

GRB 190630B: Swift/UVOT Upper Limits

K. K. Simpson (PSU) and F. E. Marshall (NASA/GSFC)
report on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 190630B
65 s after the BAT trigger (Krimm et al., GCN Circ. 24913).
No optical afterglow consistent with the optical position
(Zheng and Filippenko GCN Circ. 24914)
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 initial exposures are:

Filter         T_start(s)   T_stop(s)      Exp(s)         Mag

white               65          131           65         >20.5
b                57357      57675         308        >20.69
uvm2         39177       40077         885       >20.36
u                46044       46193         145       >19.89
v                 55313       55640         317      >18.87
uvw1          40084       40453          363      >20.02
uvw2          49543       49700          155      >19.09


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).