August 2023 - vsnet-alert - ooruri.kusastro.kyoto-u.ac.jp

[vsnet-alert 27953] X Ser in outburst
by Robert J. Modic 31 Aug '23

31 Aug '23

CCD Observations Object YYYYMMDD(UT) Mag Obs Chart Remarks SERX 20230830.635 15.62V MRV Henden MPO61; Err 0.04; Outburst Instruments: RCOS 24" w/FLI PL1603, AAVSONet (MPO61) Observer: Robert J. Modic (MRV)

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[vsnet-alert 27948] Swift J1727.8-1613: black-hole binary and V404 Cyg-like object ?
by Mariko Kimura 30 Aug '23

30 Aug '23

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 … [View More]

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[vsnet-alert 27950] Re: SwiftJ1727.8-1613
by Taichi Kato 26 Aug '23

26 Aug '23

Re: SwiftJ1727.8-1613 Itoh-san reported time-resolved photometry (as TCP J17274332-1612188). Strong short-term variations comparable to V404 Cyg (more than 0.1 mag) were not detected.

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[vsnet-alert 27949] MASTER OT J183342.09+654019.1 superoutburst
by Taichi Kato 26 Aug '23

26 Aug '23

MASTER OT J183342.09+654019.1 superoutburst Superhumps of this object were observed in 2021 Apr., but not so well. YYYYMMDD(UT) mag observer 20230803.2927 17.662g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230805.3107 17.534g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230814.4402 17.555g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230822.4005 15.150g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) (forwarded … [View More]

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[vsnet-alert 27947] Re: FZ Cet (UGSU) outburst
by Taichi Kato 21 Aug '23

21 Aug '23

> The UGSU-type dwarf nova FZ Cet is in outburst according to NMW survey > photometry (135mm f/2.0 lens + unfiltered STL-11000 CCD): Please pay attention not to post a new message as a reply to an old, unrelated message. See how your posting looks like: http://ooruri.kusastro.kyoto-u.ac.jp/mailman3/hyperkitty/list/vsnet-alert@o…

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[vsnet-alert 27039] GX Cas (UGSU) outburst
by Kirill Sokolovsky 20 Aug '23

20 Aug '23

The UGSU-type dwarf nova GX Cas is in outburst according to NMW survey photometry (135mm f/2.0 lens + unfiltered ST-8300M CCD): 2022-11-13.7397 2459897.2397 13.4 CV AAVSO observer KLO reports visual observation of this outburst: 2022-11-12.9520 2459896.4520 13.6 Vis. ASAS-SN photometry (latest observation is quiescence on 2022-11-12.165): https://asas-sn.osu.edu/sky-patrol/coordinate/7c8f8333-01a3-49aa-ba14-08b07… VSX record for GX Cas https://www.aavso.org/vsx/index.php?view=detail.… [View More]

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[vsnet-alert 27945] Optical high state of Blazar 1ES 1959+650
by Stefan Karge 15 Aug '23

15 Aug '23

Blazar 1ES 1959+650 in optical high state object date (UTC) mag comment -------------------------------------------------- 1959+650 20230717.874 14.17V active (1) 1959+650 20230805.109 14.06V active (1) 1959+650 20230812.… [View More]

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[vsnet-alert 27944] TCP J16420534+8156125 ordinary superhumps
by Taichi Kato 12 Aug '23

12 Aug '23

TCP J16420534+8156125 ordinary superhumps The most recent observations by Itoh-san on Aug. 12 showed ordinary superhumps.

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[vsnet-alert 27927] TCP J16420534+8156125 bright likely dwarf nova
by Taichi Kato 09 Aug '23

09 Aug '23

TCP J16420534+8156125 bright likely dwarf nova http://cbat.eps.harvard.edu/unconf/followups/J16420534+8156125.html 164209.215 +815556.26 (2000.0) Gaia_DR2_1710719047756794368 plx=1.700(0.682) dismod=8.8 pmra=-13.473(1.951) pmdec=25.647(2.137) G=20.587 BP=20.469 RP=20.125 164209.212 +815556.28 (2000.0) Gaia_EDR3_1710719047756794368 plx=1.896(0.572) dismod=8.6 pmra=-13.299(0.746) pmdec=25.917(0.841) G=20.494 BP=20.613 RP=20.253

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[vsnet-alert 27942] TY PsA superoutburst
by Taichi Kato 09 Aug '23

09 Aug '23

TY PsA superoutburst YYYYMMDD(UT) mag observer 20230804.4195 15.543zr (ZTF Alert DC mag (Masci+ 2019)) 20230805.4013 15.690g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230805.4326 15.663zg (ZTF Alert DC mag (Masci+ 2019)) 20230805.8474 15.230g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230806.3172 11.890g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230807.526 110 (Rod Stubbings) 20230807.8910 11.626g (ASAS-SN Sky … [View More]

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vsnet-alert August 2023