Swift/MAXI/Fermi detection of strong X-ray activity from 2S 1417-624
ATel #14349; Mangal Hazra (MCC), Sabyasachi Pal (MCC/ICSP), Manoj Mandal (MCC) and Bikram Bhunia (MCC)
on 26 Jan 2021; 11:59 UT
Credential Certification: Sabyasachi Pal (sabya.pal@gmail.com)
Subjects: X-ray, Request for Observations, Transient, Pulsar
Referred to by ATel #: 14394
The X-ray pulsar 2S 1417-624 was discovered with SAS-3 in 1978 (Apparao et al., 1980, A&A, 89, 249). The source went through several outbursts after its discovery (ATel #52, #2275, #11479, #11569, #12841). The spin period of the X-ray pulsar was ~17.5 s and the magnetic field was ~1012 G during the 2018 outburst (Doroshenko et al., 2019, MNRAS, 491, 1851).
From the second week of January, the flux of the source in hard X-ray started to increase and reached a maximum daily average flux of 0.08±0.007 Crab on MJD 59239 (25th January 2021) as measured by Swift/BAT (15-50 keV). The X-ray flaring activity was also detected by MAXI/GSC (2-20 keV). The flux reached a maximum value of 0.02±0.002 Crab (2-20 keV) on MJD 59239 (25th January 2021).
The X-ray pulsed flux has also started to increase from MJD 59224 in Fermi/GBM (12-25 keV) and reached 0.17±0.014 keV/cm2/s on MJD 59233. The spin period is 17.36 s as measured by Fermi/GBM on MJD 59233. The spin frequency has started to increase at a rate of 5.3×10-13 Hz/s.
We encourage further multi-wavelength observations.
This research has made use of the MAXI data provided by RIKEN, JAXA, and the MAXI team.
Light curve of 2S 1417-624
