[vsnet-grb-info 11953] GRB120521B: SSO 2.3m upper limits
GCN Circulars
gcncirc at capella2.gsfc.nasa.gov
Thu May 24 18:31:46 JST 2012
TITLE: GCN CIRCULAR
NUMBER: 13342
SUBJECT: GRB120521B: SSO 2.3m upper limits
DATE: 12/05/24 09:31:38 GMT
FROM: Sharon Rapoport at The ANU <rapoport at mso.anu.edu.au>
S. Rapoport, S. Sweet, J. Scharwachter, B. Schmidt, M. Childress
report observations of GRB120521B taken on 2012-05-21.42 UTC (2.7
hours post-alert) using the Wide Field Spectrograph (WiFeS) on the ANU
2.3m, obtaining 3x900s integration at resolution R=3000.
Spectral summation of the sky-subtracted data cube in a 3" radius centered at
the GRB location shows no detectable optical counterpart to the GRB
and no detectable host galaxy. Based on measurement of a nearby field
star in the data cube (m_B=18.4, m_R=17.2 -- USNO) we estimate a
non-detection upper limit of m_R=20.5 and m_B=20.0 at 5 sigma for the
GRB or its host galaxy.
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