X-ray re-brightening of GRO J0422+32 = V518 Per

(vsnet-alert 809)

According to IAUC No. 6605 (1997 Mar. 27), A. Iyudin and F. Haberl reported their detection of an outburst of the ultrasoft X-ray transient GRO J0422+32 = V518 Per (Nova Per 1992) by the All-Sky Monitor on RXTE between 1996 Nov. 18 and 1997 Jan. 15.

Visual observations reported to vsnet-obs (by G. Poyner and T. Watanabe) set an upper limit of mv=14.9 in optical at the moment of this X-ray re-brightening.

This X-ray transient showed a long-lasting X-ray and optical outburst in 1992, followed by two mini-outbursts similar to what were observed in EG Cnc. Serveral authors have suspected this object to contain a compact object either a low-mass black hole or a neutron star or something(?) whose mass is close to the upper limit of a stable neutron star.

(Deep) observations are still encouraged.

Taichi Kato

V-band image on 1997 Mar. 31

GRO J0422+32 in outburst (1992 Dec. 12)

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