Swift XRT Observations of SGR J0755-2933
ATel #8868; R. F. Archibald (McGill), P. Scholz (McGill), and V. Kaspi (McGill)
on 25 Mar 2016; 17:08 UT
Credential Certification: Robert Archibald (rarchiba@physics.mcgill.ca)
Subjects: X-ray, Soft Gamma-ray Repeater, Pulsar
Referred to by ATel #: 8943
On 2016 March 16th, the Swift Burst Alert Telescope (BAT) detected a short magnetar like burst from a likely new magnetar, SGR J0755-2933 (Barthelmy, et al., GCN Circ. 19204). Following this detection, SGR J0755-2900 has been monitored with the Swift X-ray Telescope (XRT) where its absorbed 0.5--10-keV flux fell from at initial value of 7.9(6)E-11 erg/s/cm^2 at MJD 57463.9 to 1.7(6)E-11 erg/s/cm^2 at MJD 57464.5.
From MJD 57465.4 to 57470.3, the flux has been relatively stable at 5.5(1.5)E-12 erg/s/cm^2. As yet no further X-ray bursts have been detected, nor has a significant periodicity been found in 17.9 ks of XRT data taken in windowed timing mode with 1.7-ms time resolution. With this, we can place a 3-sigma upper limit on the 0.7-10 keV pulsed fraction of 15%.
