- vsnet-campaign-dn - ooruri.kusastro.kyoto-u.ac.jp

[vsnet-campaign-dn 16017] MASTER OT J070314.79+202133.9 outburst
by Taichi Kato 30 Sep '21

30 Sep '21

MASTER OT J070314.79+202133.9 outburst http://gsaweb.ast.cam.ac.uk/alerts/alert/Gaia21eij/ Gaia21eij AT2020aayl 2021-09-17 19:11:12 105.81191 20.35932 15.37 18.23 1.50 unknown 2021-09-29 07:53:17 4 mag blue outburst on a Gaia source, previous outbursts in lightcurve, candidate CV Precursor and superoutburst in 2020 Nov.-Dec. in ZTF data.

1 0

[vsnet-campaign-dn 16016] Gaia21eik: likely SU UMa star
by Taichi Kato 30 Sep '21

30 Sep '21

Gaia21eik: likely SU UMa star http://gsaweb.ast.cam.ac.uk/alerts/alert/Gaia21eik/ Gaia21eik AT2021zxz 2021-09-17 18:25:11 54.66502 53.85891 18.43 19.50 0.32 unknown 2021-09-29 07:55:11 Outburst in Gaia source, previous outburst in lightcurve Likely superoutburst in 2019 Oct.-Nov. Probably in combined magnitude in ZTF data.

1 0

[vsnet-campaign-dn 16015] MASTER OT J055845.55+391533.4 superoutburst
by Taichi Kato 30 Sep '21

30 Sep '21

MASTER OT J055845.55+391533.4 superoutburst ZTF light curves of past superoutbursts have complex profiles. May not be an ordinary SU UMa star. YYYYMMDD(UT) mag observer 20210828.8465 <142c (Yutaka Maeda) 20210829.8457 <146c (Yutaka Maeda) 20210830.8308 <162c (Yutaka Maeda) 20210831.8157 <156c (Yutaka Maeda) 20210909.7884 146:cG (Yutaka Maeda) 20210911.1820 14.20cG (Masao Funada) 20210918.7888 <162c (Yutaka Maeda) 20210919.8442 <159c (Yutaka Maeda) 20210922.7850 <152c (Yutaka Maeda) 20210923.7868 153c (Yutaka Maeda) 20210924.7913 153:c (Yutaka Maeda) 20210926.069 15.14C (Gary Poyner) 20210926.0696 15.13C (Masao Funada) 20210927.7853 151cG (Yutaka Maeda)

1 0

[vsnet-campaign-dn 16014] SDSS J203501.46-001946.1 outburst
by Taichi Kato 29 Sep '21

29 Sep '21

SDSS J203501.46-001946.1 outburst Subtype unknown. Somewhat looks like an SU UMa star in ZTF data. YYYYMMDD(UT) mag observer 20210907.2488 17.831zg (Zwicky Transient Facility Lasair (Masci+ 2019)) 20210909.3393 17.696zr (Zwicky Transient Facility Lasair (Masci+ 2019)) 20210911.3211 17.875zr (Zwicky Transient Facility Lasair (Masci+ 2019)) 20210927.2251 15.424zr (Zwicky Transient Facility Lasair (Masci+ 2019)) 20210929.1714 15.677zr (Zwicky Transient Facility Lasair (Masci+ 2019)) 20210929.2145 15.641zg (Zwicky Transient Facility Lasair (Masci+ 2019))

1 0

[vsnet-campaign-dn 16013] CRTS J210820.6-134909 outburst
by Taichi Kato 29 Sep '21

29 Sep '21

CRTS J210820.6-134909 outburst AM CVn star suspected. YYYYMMDD(UT) mag observer 20210929.2474 17.421zg (Zwicky Transient Facility Lasair (Masci+ 2019))

1 0

[vsnet-campaign-dn 16012] ASASSN-15qr possible superoutburst
by Taichi Kato 29 Sep '21

29 Sep '21

ASASSN-15qr possible superoutburst Known SU UMa star. YYYYMMDD(UT) mag observer 20210929.1733 15.932zr (Zwicky Transient Facility Lasair (Masci+ 2019))

1 0

[vsnet-campaign-dn 16011] ASASSN-15jq possible superoutburst
by Taichi Kato 29 Sep '21

29 Sep '21

ASASSN-15jq possible superoutburst Suspected type from ZTF data. YYYYMMDD(UT) mag observer 20210905.2505 19.893zr (Zwicky Transient Facility Lasair (Masci+ 2019)) 20210905.2507 19.893zr (Zwicky Transient Facility Lasair (Masci+ 2019)) 20210909.3393 19.235zr (Zwicky Transient Facility Lasair (Masci+ 2019)) 20210911.3211 19.577zr (Zwicky Transient Facility Lasair (Masci+ 2019)) 20210915.2090 <170C (Masao Funada) 20210916.2554 19.933zr (Zwicky Transient Facility Lasair (Masci+ 2019)) 20210927.2251 16.345zr (Zwicky Transient Facility Lasair (Masci+ 2019)) 20210929.1714 16.523zr (Zwicky Transient Facility Lasair (Masci+ 2019)) 20210929.2145 16.593zg (Zwicky Transient Facility Lasair (Masci+ 2019))

1 0

[vsnet-campaign-dn 16010] ASASSN-16gr outburst
by Taichi Kato 29 Sep '21

29 Sep '21

ASASSN-16gr outburst Subtype unknown. Bright outburst. YYYYMMDD(UT) mag observer 20210820.4678 <147c (Yutaka Maeda) 20210827.4723 <138c (Yutaka Maeda) 20210828.4531 <148c (Yutaka Maeda) 20210927.2318 15.567zr (Zwicky Transient Facility Lasair (Masci+ 2019)) 20210929.1719 15.775zr (Zwicky Transient Facility Lasair (Masci+ 2019))

1 0

[vsnet-campaign-dn 16009] AHTS-2020-001 possible superoutburst
by Taichi Kato 29 Sep '21

29 Sep '21

AHTS-2020-001 possible superoutburst Type from ZTF data. YYYYMMDD(UT) mag observer 20210926.1756 16.511zr (Zwicky Transient Facility Lasair (Masci+ 2019)) 20210928.1909 16.947zr (Zwicky Transient Facility Lasair (Masci+ 2019))

1 0

[vsnet-campaign-dn 16008] ASASSN-21sb: new SU UMa-type dwarf nova
by tonny.vanmunster＠gmail.com 27 Sep '21

27 Sep '21

Dear colleagues, I have just finished analysing my time-series observations of ASASSN-21sb, obtained on 2021, Sep 25/26 and Sep 26/27 at resp. CBA Extremadura Observatory and CBA Belgium observatory, using 0.40-m telescopes with SX-46 CCD and QHY-268M CMOS camera's. Regular superhumps with an amplitude of 0.32 mag are clearly visible in the resulting light curve, establishing ASASSN-21sb as a new SU UMa-type dwarf nova. A period analysis using the ANOVA, Lomb-Scargle, Generalized-Lomb-Scargle and PDM methods (Peranso 3.0), yields a combined superhump period of 0.0589 +/- 0.0003d. The object was at mag CV = 16.2 on Sep 27th. I will send my observations to AAVSO, CBA and VSNET for further analysis. Best regards Tonny --- Tonny Vanmunster CBA Belgium Observatory CBA Extremadura Observatory http://www.cbabelgium.com PERANSO : The Light Curve and Period Analysis Software http://www.peranso.com

1 0