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ATEL # 2082; M.A.P. Torres (CfA), D. Steeghs (Warwick/CfA), P. G. Jonker (SRON/CfA), J. Kennea (PSU), J. Homan (MIT) and J. M. Miller (Michigan)
on 14 Jun 2009; 16:00 UT
Password Certification: Manuel Torres (email@example.com)
Subjects: X-ray, Gamma Ray, Transients
Referred to by ATEL #: 2083
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.