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INTEGRAL/JEM-X detection of a type-I X-ray burst from MAXI J1421-613

ATel #5765; E. Bozzo (ISDC, Switzerland), A. Bazzano (INAF/IAPS Roma, Italy), E. Kuulkers (ESA/ESAC, Spain), M. Fiocchi (INAF/IAPS Roma, Italy), C. Ferrigno (ISDC, Switzerland), L. Bassani, A. Malizia, P. Parisi, V. Sguera (INAF/IASF Bologna, Italy), L. Natalucci, A. Tarana, P. Ubertini (INAF/IAPS Roma, Italy), A. Paizis, L. Sidoli (INAF/IASF Milano, Italy), A. J. Bird, P. A. Charles (Univ. of Southampton, UK), J. Chenevez (DTU Space, Denmark), C. Winkler (ESA/ESTEC, Netherlands)
on 15 Jan 2014; 04:22 UT
Credential Certification: E. Bozzo (enrico.bozzo@unige.ch)

Subjects: X-ray, Neutron Star, Transient

Referred to by ATel #: 5780, 5802, 5894

During the Galactic Plane Scan performed on 2014 January 10, the two JEM-X instruments on-board INTEGRAL detected a type-I X-ray burst from the newly discovered X-ray transient MAXI J1421-613 (ATels #5750, #5751, #5759) over the 5 ks in which the source was in the instruments field of view.

The onset of the burst occurred on 2014 January 10 at 19:05 UTC, and the total event as observed by JEM-X lasted for about 20 s (3-25 keV). The average spectrum of the burst could be roughly described by using a black-body model with temperature kT~1 keV. The corresponding flux was 1.7E-9 erg/cm^2/s (translating into a luminosity of 1.3E37 erg/s at 8 kpc; 3-10 keV). We estimated a persistent flux outside the burst of 7E-10 erg/cm^2/s (3-25 keV).

This detection reveals that MAXI J1421-613 is a newly discovered X-ray bursting transient source, thus hosting an accreting neutron star.