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The largest glitch of the Crab pulsar detected at the X-ray band

ATel #11025; Liangwei Huang (Qian Xuesen Laboratory of Space Technology), Xinyuan Zhang (Qian Xuesen Laboratory of Space Technology), Yuanjie Du (Qian Xuesen Laboratory of Space Technology), Ping Shuai (Qian Xuesen Laboratory of Space Technology) and Shaolong Chen (Qian Xuesen Laboratory of Space Technology)
on 30 Nov 2017; 03:31 UT
Credential Certification: Y. J. Du (duyuanjie@qxslab.cn)

Subjects: X-ray, Neutron Star, Pulsar

The X-ray pulsar navigation 1 (XPNAV-1) satellite is a small soft X-ray (0.5-10 keV band) telescope launched on 10 November 2016, which continues to do X-ray timing studies for pulsars. The time-resolved soft X-ray spectrometer (TSXS) is the major scientific payload onboard XPNAV-1 which monitors the Crab pulsar (PSR B0531+21) every day. Detailed information about the XPNAV-1 and the TSXS was given in the published paper as follows http://downloads.hindawi.com/journals/ijae/2017/8561830.pdf. During the time span of the largest glitch of the Crab pulsar recently reported in the radio band (ATel #10939), totally 111 TSXS observations of the Crab pulsar were carried out, of which 15 were executed during the 6 days shortly after this glitch. These X-ray observations confirm the recent glitch. Our preliminary analysis indicates a fractional rotational spin-up of \delta(F0)/F0 = (0.470+/-0.002)E-6 (3-sigma) and the glitch epoch of MJD 58064.55+/-0.01(3 sigma), which is consistent with the values as reported by Shaw et al. (ATel #10939). The phase connected residuals with the pre-glitch solutions can be seen at the link below. Continuous follow-up XPNAV-1 observations of the Crab pulsar will be operated to obtain more detailed glitch physical information.

Phase connected residuals with the prefit residuals