T CrB, is a symbiotic recurrent nova with eruptions recorded in 1866 and 1946. It is also a δ X-ray type source.

It is also detected with Swift at energies greater that ∼50 keV. However, since April 2015, it entered in a hard X-ray faint state.

A soft X-ray component with E< 0.6 keV was detected with XMM-Newton in 2017 and 2018. That component seems to be missing in the recent Swift/XRT ToO observations requested by our group.

Our group is currently obtaining Swift/XRT data looking for possible X-ray brightenings.

T CrB

Position: FK5 coord. (ep=J2000 eq=2000) : R.A.=15 59 30.16; DEC:+25 55 12.60

Swift/BAT Hard X-ray Transient Monitor daily ligth curve, with 100 days bins.

AAVSO Optical light curve (left Y axis) and Swift BAT 100 days/bin light curve (right Y axis). The moving vertical line indicates the dates of the Swift XRT observations whose spectra are shown in the bottom panel. The optical/XRT/BAT flux cleary vary in tandem.

 

References:

Simbad query results