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A rapid X-ray brightening of PSR J2032+4127/MT91 213

ATel #10993; K. L. Li (MSU), A. K.H. Kong (NTHU), J. Takata (HUST), P. H.T. Tam (SYSU), K. S. Cheng (HKU), X. He (SYSU), C. Y. Hui (CNU), C. W. Ng (HKU), Partha Sarathi Pal (SYSU)
on 22 Nov 2017; 11:31 UT
Credential Certification: Albert Kong (akong@phys.nthu.edu.tw)

Subjects: Optical, Ultra-Violet, X-ray, Request for Observations, Binary, Variables, Pulsar

After showing an X-ray decline around the periastron (2017-11-13 or MJD 58070; ATel #10920), the gamma-ray binary candidate PSR J2032+4127/MT91 213 has exhibited a dramatic return in X-rays, witnessed by the three Swift/XRT observations taken in 2017-11-20/21 (see also the light curve at the end of the ATel). Below is a summary of recent XRT measurements.

2017-11-19 02:22:13-05:57:53UT (0.024 +/- 0.004) cts/s (last data before the brightening)

2017-11-20 11:59:26-15:22:52UT (0.041 +/- 0.004) cts/s

2017-11-21 13:41:57-15:11:52UT (0.060 +/- 0.006) cts/s

2017-11-21 22:55:04-23:19:53UT (0.065 +/- 0.007) cts/s

The hardness ratio (H/S; S = 0.3-1.5keV and H = 1.5-10keV) hints for an increase as well from ~4 to ~6, although it is not statistically significant.

There is a possible positive correlation between the UVOT and the X-ray light curves since about MJD 58000 (ATel #10851). In the latest measurements, the UV counterpart is getting slightly brighter, but the scale is much smaller compared to that in X-rays.

Multi-wavelength follow-up observations are strongly encouraged.

This work made use of data supplied by the UK Swift Science Data Centre at the University of Leicester.

The multi-wavelength light curves of PSR J2032+4127