[vsnet-grb-info 6126] GRB 080514B: UVOT Observations

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  7759
SUBJECT: GRB 080514B: UVOT Observations
DATE:    08/05/21 14:07:20 GMT
FROM:    Stephen Holland at USRA/NASA/GSFC/SSC  <sholland at milkyway.gsfc.nasa.gov>

S. T. Holland (CRESST/USRA/GSFC) reports on behalf of the Swift/UVOT
team:

     The Swift/UVOT observed the field of GRB 080514B starting 37,005 s
after the SuperAGILE/IPN detection (Rapisarda et al., GCN Circ. 7715).
We detect the optical afterglow in the b, u, uvw1, and uvm2 filters at
the location of the IAC80 optical afterglow (de Ugarte Postigo, et al.,
2008, GCNC 7719).  The UVOT source position is

  RA(J2000.0) =  21:31:22.71
Dec(J2000.0) = +00:42:28.4

with an estimated uncertainty of +/-0.60 arcsec (radius, 90%
confidence).

     Magnitudes and upper limits are reported below.

Filter    T_start (s) T_stop  Exposure   Mag    Err  Comment
   v       38,184     43,906      352    >20.1        3-sigma UL
   b       37,449     48,630      559     20.92 0.27
   u       37,229     48,415      559     19.97 0.17
  uvw1     37,005     48,198     1118     20.74 0.24
  uvm2     38,333     44,537     1030     20.83 0.32
  uvw2     37,601     49,441     2199    >22.1        3-sigma UL
white    209,879    228,394     5360    >23.3        3-sigma UL

The above magnitudes and upper limits are not corrected for the
Galactic extinction along the line of sight corresponding to a
reddening of E_{B-V} = 0 .06 mag (Schlegel et al., 1998, ApJS,
500, 525).  The photometry is on the UVOT flight system described
in Poole et al. (2008, MNRAS, 383,627).  The non-detections in
the uvw2 filters may indicate that the redshift is z >~ 1.9.