GCN Circular 7292
Subject
GRB 080210: Swift/UVOT Refined Analysis
Event
Date
2008-02-11T22:57:46Z (18 years ago)
From
Frank Marshall at GSFC <marshall@milkyway.gsfc.nasa.gov>
F.E. Marshall (NASA/GSFC) and D. Grupe (PSU)
report on behalf of the Swift team:
The Swift/UVOT observed the field of GRB 080210 (trigger 302888)
starting 160 seconds after the BAT trigger
(Grupe et al., GCN Circ. 7281), which occurred at 07:50:05 UT.
A bright afterglow was seen in the initial
exposures with the White and V filters
at a position of RA (J2000) of 16h45m04.01s and Dec (J2000) of
+13o49'35.9" (J2000) with an estimated 90% confidence error radius
of 0.6". This position is consistent with the optical
position reported by Klotz et al. (GCN Circ. 7280) and
the enhanced XRT position reported by Evans et al. (GCN Circ. 7285).
There was no 3-sigma detection of the afterglow in
any subsequent exposure in any of the UVOT filters.
The non-detections in the UV filters is consistent with
the redshift of 2.641 reported by Jakobsson et al.
(GCN Circ. 7286). The lack of detection in the second
exposure with the White filter indicates a decay slope
of steeper than -0.7 assuming a power law decay model.
The detections and 3-sigma upper limits in the UVOT photometric
system (Poole et al. MNRAS 383, 627 (2008)) are summarized in
the following table:
Filter T_start(s) T_stop(s) Exposure(s) Mag/3-sigma UL
white 160 260 98 18.2 +/- 0.1
white 6081 6244 161 >20.5
v 267 460 190 17.6 +/- 0.1
b 5877 64094 2625 >21.2
u 5671 69878 4779 >21.3
uvw1 3846 69140 5453 >22.3
uvm2 3639 68241 4447 >21.8
uvw2 9469 74958 4171 >22.3
The values quoted above are not corrected for the expected Galactic
extinction corresponding to a reddening of E(B-V) = 0.08 mag
in the direction of the burst (Schlegel et al. 1998).