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

[vsnet-alert 26470] MASTER OT J030227.28+191754.5 light curve so far
by Denis Denisenko 29 Nov '21

29 Nov '21

I have compiled the light curve of this unusual large-amplitude optical transient using online data from ASAS-SN and ATLAS surveys available as of 09:20 UT on 2021 Nov. 29. It is posted at http://scan.sai.msu.ru/~denis/J0302+1917-LC-Nov2021.gif Note 20+16 upper limits from two different ASAS-SN units on Nov. 25.27-25.29 UT and 25.78-25.80 UT. Not a usual observing cadence by this instrument. Looks like ASAS-SN was also covering the IceCube neutrino event, and just missed the optical transient by a magnitude or so! References MASTER: ATel #15067 (Zhirkov, Kechin, Lipunov et al.) ASAS-SN: Kochanek et al., 2017 ATLAS: Tonry et al., 2018 R. Fidrich: vsnet-alert 26468 Note: MASTER-OAFA observation time was given in ATel #15067 as "5 hours later" (after MASTER-Tavrida detection, that is). I have used MJD=59545.034 for the MASTER-OAFA point with 13.4m. Time error box (+/-30 min, or 0.02 d) is smaller than the symbol size on the plot. Another note: 20.8 mag. star 2" to the west-north-west of the transient is not related to the variable itself. It has a proper motion detectable between SDSS and Pan-STARRS epochs, and at the DSS plates is was located to the south of the OT position. Most likely it is a red dwarf closer to the Sun than the MASTER OT. Finally, the progenitor has quite a blue color in SDSS: u=22.17 g=21.95 r=21.93 i=22.19 z=22.41 Denis Denisenko

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[vsnet-alert 26469] MASTER OT J030227.28+191754.5: KWS pre- and post-discovery data
by Hiroyuki Maehara 29 Nov '21

29 Nov '21

According to the KWS data, the object was at V~12 mag on Nov. 27.558 and V~11.8 mag on Nov 28.558-28.559. object date(UT) mag. code err. MASTER_OT_J030227.28+191754.5 20211123.56269 <122V KW2 -- MASTER_OT_J030227.28+191754.5 20211123.56272 <112Ic KW2 -- MASTER_OT_J030227.28+191754.5 20211123.56303 <127V KW2 -- MASTER_OT_J030227.28+191754.5 20211123.56307 <108Ic KW2 -- MASTER_OT_J030227.28+191754.5 20211123.56358 <122V KW2 -- MASTER_OT_J030227.28+191754.5 20211123.56361 <111Ic KW2 -- MASTER_OT_J030227.28+191754.5 20211123.56392 <123V KW2 -- MASTER_OT_J030227.28+191754.5 20211123.56396 <110Ic KW2 -- MASTER_OT_J030227.28+191754.5 20211125.57029 <126V KW2 -- MASTER_OT_J030227.28+191754.5 20211125.57032 <111Ic KW2 -- MASTER_OT_J030227.28+191754.5 20211125.57066 <124V KW2 -- MASTER_OT_J030227.28+191754.5 20211125.57068 <107Ic KW2 -- MASTER_OT_J030227.28+191754.5 20211125.57122 <112Ic KW2 -- MASTER_OT_J030227.28+191754.5 20211125.57156 <108Ic KW2 -- MASTER_OT_J030227.28+191754.5 20211126.56848 <130V KW2 -- MASTER_OT_J030227.28+191754.5 20211126.56852 <117Ic KW2 -- MASTER_OT_J030227.28+191754.5 20211126.56883 <131V KW2 -- MASTER_OT_J030227.28+191754.5 20211126.56887 <113Ic KW2 -- MASTER_OT_J030227.28+191754.5 20211126.56940 <129V KW2 -- MASTER_OT_J030227.28+191754.5 20211126.56943 <113Ic KW2 -- MASTER_OT_J030227.28+191754.5 20211126.56976 <126V KW2 -- MASTER_OT_J030227.28+191754.5 20211126.56979 <117Ic KW2 -- MASTER_OT_J030227.28+191754.5 20211127.55807 11.916V KW2 0.158 MASTER_OT_J030227.28+191754.5 20211127.55810 <114Ic KW2 -- MASTER_OT_J030227.28+191754.5 20211127.55841 12.084V KW2 0.182 MASTER_OT_J030227.28+191754.5 20211127.55845 <114Ic KW2 -- MASTER_OT_J030227.28+191754.5 20211127.55899 <110Ic KW2 -- MASTER_OT_J030227.28+191754.5 20211127.55934 <113Ic KW2 -- MASTER_OT_J030227.28+191754.5 20211128.55787 11.757V KW2 0.131 MASTER_OT_J030227.28+191754.5 20211128.55791 11.577Ic KW2 0.370 MASTER_OT_J030227.28+191754.5 20211128.55822 11.702V KW2 0.125 MASTER_OT_J030227.28+191754.5 20211128.55825 11.224Ic KW2 0.268 MASTER_OT_J030227.28+191754.5 20211128.55876 11.852V KW2 0.143 MASTER_OT_J030227.28+191754.5 20211128.55880 11.220Ic KW2 0.269 MASTER_OT_J030227.28+191754.5 20211128.55911 12.211V KW2 0.197

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[vsnet-alert 26467] Spectroscopic and Photometric follow-up of MASTER OT J030227.28+191754.5
by Keisuke Isogai 29 Nov '21

29 Nov '21

Spectroscopic and Photometric follow-up of MASTER OT J030227.28+191754.5 We performed spectroscopic and photometric observations. We propose that this object is a possible narrow-lined He nova or very large-amplitude WZ Sge-type dwarf nova. https://www.astronomerstelegram.org/?read=15072 This object is showing enigmatic behavior. Further observations are strongly encouraged!

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[vsnet-alert 26466] ZTF J210411.01-010202.3 = Gaia21fhx
by Taichi Kato 28 Nov '21

28 Nov '21

ZTF J210411.01-010202.3 = Gaia21fhx http://gsaweb.ast.cam.ac.uk/alerts/alert/Gaia21fhx/ Gaia21fhx AT2021afpm 2021-11-26 11:04:51 316.04638 -1.03367 15.17 unknown 2021-11-27 16:08:10 transient on blue PanSTARRS source, candidate CV 2MASS 210411.030 -010201.98 (2000.0) 16.605 15.908 15.659 210411.0 -010202 (2000.0) ZTFJ210411.01-010202.3 r=19.566 (18.456-19.939) P=0.0296 210410.999 -010202.33 (2000.0) Gaia_DR2_6917174984897161088 plx=1.906(0.408) dismod=8.6 pmra=0.711(0.799) pmdec=-15.658(0.716) G=19.443 BP=20.723 RP=18.266 210410.999 -010202.34 (2000.0) Gaia_EDR3_6917174984897161088 plx=2.116(0.328) dismod=8.4 pmra=0.956(0.329) pmdec=-14.974(0.268) G=19.416 BP=20.761 RP=18.273 Bright in 2MASS (but red). Dwarf nova with a long orbital period?

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[vsnet-alert 26465] PU Per superoutburst
by Taichi Kato 27 Nov '21

27 Nov '21

PU Per superoutburst (Supercycle about a year) YYYYMMDD(UT) mag observer 20211119.6658 <155cG (Yutaka Maeda) 20211120.6376 <150c (Yutaka Maeda) 20211122.919 <147 (Gary Poyner) 20211124.1721 15.181zr (Zwicky Transient Facility Lasair (Masci+ 2019)) 20211124.2595 14.872zg (Zwicky Transient Facility Lasair (Masci+ 2019)) 20211125.6244 148c (Yutaka Maeda) 20211126.6073 150c (Yutaka Maeda)

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[vsnet-alert 26464] Gaia21fcw fading
by Taichi Kato 27 Nov '21

27 Nov '21

Gaia21fcw fading SS Cyg star with a long orbital period? YYYYMMDD(UT) mag observer 20211104.2462 17.410zg (Zwicky Transient Facility Lasair (Masci+ 2019)) 20211104.2471 17.423zg (Zwicky Transient Facility Lasair (Masci+ 2019)) 20211106.1553 17.284zg (Zwicky Transient Facility Lasair (Masci+ 2019)) 20211106.3030 17.231zg (Zwicky Transient Facility Lasair (Masci+ 2019)) 20211106.3035 17.230zg (Zwicky Transient Facility Lasair (Masci+ 2019)) 20211108.2198 16.561zg (Zwicky Transient Facility Lasair (Masci+ 2019)) 20211108.2203 16.547zg (Zwicky Transient Facility Lasair (Masci+ 2019)) 20211108.2238 16.535zg (Zwicky Transient Facility Lasair (Masci+ 2019)) 20211111.2421 16.036zg (Zwicky Transient Facility Lasair (Masci+ 2019)) 20211111.2426 16.020zg (Zwicky Transient Facility Lasair (Masci+ 2019)) 20211111.2585 16.045zg (Zwicky Transient Facility Lasair (Masci+ 2019)) 20211113.9181 15.25C (Masao Funada) 20211114.5755 151C (Masayuki Moriyama) 20211115.6456 147C (Masayuki Moriyama) 20211116.6623 15.06C (Masayuki Moriyama) 20211126.6568 163:C (Masayuki Moriyama)

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[vsnet-alert 26463] KL Dra superoutburst?
by Taichi Kato 27 Nov '21

27 Nov '21

KL Dra superoutburst? (AM CVn) YYYYMMDD(UT) mag observer 20211108.1998 18.610zg (Zwicky Transient Facility Lasair (Masci+ 2019)) 20211111.1165 18.885zg (Zwicky Transient Facility Lasair (Masci+ 2019)) 20211113.1983 18.247zg (Zwicky Transient Facility Lasair (Masci+ 2019)) 20211115.5638 <157C (Masayuki Moriyama) 20211119.1778 16.237zr (Zwicky Transient Facility Lasair (Masci+ 2019)) 20211125.1124 16.669zr (Zwicky Transient Facility Lasair (Masci+ 2019)) 20211126.5770 153C (Masayuki Moriyama)

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[vsnet-alert 26462] V1006 Cyg slowly rising outburst
by Taichi Kato 27 Nov '21

27 Nov '21

V1006 Cyg slowly rising outburst SU UMa star. YYYYMMDD(UT) mag observer 20211118.4028 <160c (Yutaka Maeda) 20211119.1576 16.070zr (Zwicky Transient Facility Lasair (Masci+ 2019)) 20211119.4024 <162cG (Yutaka Maeda) 20211122.1177 17.895zg (Zwicky Transient Facility Lasair (Masci+ 2019)) 20211122.1182 17.913zg (Zwicky Transient Facility Lasair (Masci+ 2019)) 20211122.6191 <154C (Masayuki Moriyama) 20211125.5900 151C (Masayuki Moriyama) 20211126.5970 140C (Masayuki Moriyama)

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[vsnet-alert 26461] CRTS J231552.3+271037 likely superoutburst
by Taichi Kato 27 Nov '21

27 Nov '21

CRTS J231552.3+271037 likely superoutburst Tyoe from ZTF data. YYYYMMDD(UT) mag observer 20211122.2023 15.255zr (Zwicky Transient Facility Lasair (Masci+ 2019)) 20211125.6384 15.34C (Masayuki Moriyama) 20211126.6484 157C (Masayuki Moriyama)

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[vsnet-alert 26460] TCP J20441708-2037591
by Taichi Kato 25 Nov '21

25 Nov '21

TCP J20441708-2037591 see http://cbat.eps.harvard.edu/unconf/followups/J20441708-2037591.html Discovered by Tadashi Kojima V=12.5 on Nov. 25 204417.241 -203801.61 (2000.0) Gaia_DR2_6857113204452224512 plx=3.459(1.629) dismod=7.3 pmra=-10.225(2.117) pmdec=-20.743(0.961) G=19.746 BP=19.447 RP=19.339 204417.241 -203801.63 (2000.0) Gaia_EDR3_6857113200158102528 plx=2.674(0.576) dismod=7.9 pmra=-10.198(0.607) pmdec=-19.955(0.376) G=19.644 BP=19.578 RP=19.504 204417.247 -203801.30 (2000.0) GALEX_DR5_6379817435984299663 NUV=19.459(0.065) FUV=19.258(0.091) No outburst in ASAS-3.

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