Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009atel.2082....1t&link_type=abstract
The Astronomer's Telegram, #2082
Astronomy and Astrophysics
Astronomy
2
X-Ray, Gamma Ray, Transients
Scientific paper
We report on a target of opportunity observation by Swift/XRT of the new gamma-ray transient J1057-6027 discovered with Fermi LAT (ATel #2081). The XRT observation started on 2009-06-13 10:45 UT and was performed in Photon Counting mode for 1494 seconds. No sources are detected within the ~24 arcmin field-of-view of XRT. We derive a 95 % confidence upper limit on the source unabsorbed 0.3-10 keV flux of 7.3e-13 erg/cm**2/s assuming a power-law model with a photon index of 2 and Galactic absorption of 1.45e22 cm**-2.
Homan Jeroen
Jonker Peter G.
Kennea Jamie
Miller John Mcl.
Steeghs Daniel
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