Skip to main content
Testing. You are viewing the public testing version of GCN. For the production version, go to https://gcn.nasa.gov.
New Announcement Feature, Code of Conduct, Circular Revisions. See news and announcements

GCN Circular 13901

Subject
GRB 121024A: Swift/UVOT Observations
Date
2012-10-25T20:02:12Z (12 years ago)
From
Stephen Holland at STScI <sholland@stsci.edu>
S. T. Holland (STScI) and C. Pagani (U Leicester)
report on behalf of the Swift/UVOT team:

     The Swift/UVOT began settled observations of the field of GRB
121024A starting 158 s after the BAT trigger (Pagani et al., 2012,
GCNC 13886).  We continued to detect the optical afterglow until
approximately 10 ks after the BAT trigger.  Preliminary UVOT
photometry, and 3-sigma upper limits, for the afterglow is presented
below.

-----------------------------------------------------
Filter       TSTART   TSTOP   Exp Time       Mag  Err
-----------------------------------------------------
    u (fc)     158      408        246     18.43 0.10
-----------------------------------------------------
    v          464      483         19    >18.1
    b          413      433         19     18.44 0.25
    u          538      557         19    >18.5
 uvw1          513      533         19    >18.1
 uvm2          488      508         19    >17.6
 uvw2          439      459         19    >18.1
-----------------------------------------------------

    The quoted magnitudes and upper limits have not been corrected for
the Galactic extinction along the line of sight to this burst of
E_{B-V} = 0.09 mag (Schlafly et al. 2011, ApJS, 737, 103).  The
photometry is in the UVOT photometric system (Breeveld et al. 2011,
AIP Conf. Proc. 1358, 373).
Looking for U.S. government information and services? Visit USA.gov