[vsnet-alert 27948] Swift J1727.8-1613: black-hole binary and V404 Cyg-like object ?

Swift J1727.8-1613: black-hole binary and V404 Cyg-like object ?

Swift and MAXI detected an outburst in Swift J1727.8-1613. This is a candidate for a black-hole binary and possibly similar to V404 Cyg, a unique object known as a source of rapid variability. A few seconds variability was already found in X-rays. The most violent variability would be ~2 mag in several tens of min. This is very bright. Currently, ~13 mag. The position is (RA)17:27:46 (DEC)-16:12:53 reported by Swift. Follow-up observations are strongly encouraged. https://www.astronomerstelegram.org/?read=16205 https://www.astronomerstelegram.org/?read=16208

- Mariko Kimura at Kanazawa Univ. in Japan