MAXI J1647-227 is a Neutron Star X-ray Binary
ATel #4192; J. A. Kennea (PSU), D. Altamirano (UvA), P. A. Evans (U Leicester), H. A. Krimm (CRESST/GSFC/USRA), P. Romano, V. Mangano (INAF-IASFPA), P. Curran (CEA-Saclay), K. Yamaoka (Waseda U) and H. Negoro (Nihon U.)
on 20 Jun 2012; 13:47 UT
Distributed as an Instant Email Notice Transients
Credential Certification: Jamie A. Kennea (kennea@astro.psu.edu)
Subjects: X-ray, Transient
Referred to by ATel #: 4204
We report on ongoing monitoring observations of MAXI J1647-227 (Negoro et al., ATEL #4175, Kennea et al., ATEL #4178) by Swift. During observations taken on June 19th, 2012, we detect a Type-I X-ray burst in a 230s long observation snapshot starting 09:46 UT. This identifies MAXI J1647-227 as containing a Neutron Star compact object.
At the time of the burst, MAXI J1647-227 light-curve is steady around 14 XRT count/s, during the Type-I burst, the light-curve peaks around 55 XRT count/s. The burst shows the typical rapid rise and exponential decay, is detectable for approximately 40 seconds, and shows spectral variability during the outburst.
Analysis of the power density spectrum in the 0.5-2 keV, 2-10 keV and 0.5-10 keV ranges find no evidence of burst oscillations during the burst, not any evidence of broad band noise or QPOs.
We note that in the Photon Counting mode data reported on in ATEL #4178, there is also evidence of a Type-I X-ray burst, although severe pile-up in those data make the identification less certain.
Observations of MAXI J1647-227 by Swift are on-going.
