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

[vsnet-alert 27431] Gaia23atn
by Taichi Kato 20 Feb '23

20 Feb '23

Gaia23atn Gaia23atn AT2023cgz 2023-02-17 23:48:25 343.95057 46.56566 14.67 unknown 2023-02-19 16:26:35 Transient on very faint PanSTARRS source http://gsaweb.ast.cam.ac.uk/alerts/alert/Gaia23atn/ Not seen in outburst in the past ATLAS and ZTF data.

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[vsnet-alert 27430] ASASSN-23ax: new SU UMa-type dwarf nova
by Taichi Kato 20 Feb '23

20 Feb '23

ASASSN-23ax: new SU UMa-type dwarf nova Josch Hambsch has reported observations. Superhumps with a period of 0.0545(2) d (allowing aliases) were detected (0.2 mag).

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[vsnet-alert 27429] ASASSN-23af: oscillations during long rebrightening
by Taichi Kato 20 Feb '23

20 Feb '23

ASASSN-23af: oscillations during long rebrightening Josch Hambsch has reported further observations. At least three peaks (reaching 15 mag) have been detected during the long rebrightening.

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[vsnet-alert 27428] CSSJ091017.4-200812 superoutburst (AM CVn)
by Taichi Kato 19 Feb '23

19 Feb '23

CSSJ091017.4-200812 superoutburst (AM CVn) The last recorded one in 2019. No superhump observations yet. YYYYMMDD(UT) mag observer 20230209.9779 19.079o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230210.6977 <163C (Masayuki Moriyama) 20230214.9575 14.685o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230214.9629 14.692o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230214.9667 14.671o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230214.9790 14.696o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230216.1323 14.603c (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230216.1350 14.597c (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230216.1381 14.619c (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230216.1613 14.617c (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230217.2965 14.846zr (ZTF Alert DC mag (Masci+ 2019))

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[vsnet-alert 27427] Re: Yamamoto-san's object = CX137 = CXO GBSJ175553.2-281633 = OGLE-BLG-ELL-12042
by Taichi Kato 19 Feb '23

19 Feb '23

> My correct location data is below. > RA 17 55 53.29 > Dec -28 16 34.1 Sorry, I copied the location of CX137 by mistake.

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[vsnet-alert 27425] Yamamoto-san's object = CX137 = CXO GBSJ175553.2-281633 = OGLE-BLG-ELL-12042
by Taichi Kato 19 Feb '23

19 Feb '23

Yamamoto-san's object = CX137 = CXO GBSJ175553.2-281633 = OGLE-BLG-ELL-12042 Itoh-san's refined astrometry: RA 17 55 53.262 DEC -28 16 33.96 The location agrees with that of CX137. This is an outburst from a 0.4-d binary with prominent ellipsoidal variations. CX137: 175553.262 -281633.96 (2000.0) Gaia_EDR3_4062657359687091584 plx=1.130(0.049) dismod=9.7 pmra=1.164(0.052) pmdec=-6.889(0.035) G=16.223 BP=16.755 RP=15.373 Yamamoto-san reported that it had brightened further in the ASAS-SN data. https://asas-sn.osu.edu/sky-patrol/coordinate/b4aa63c1-fb92-40c0-96d4-2989b… Itoh-san obtained a short time-resolved photometric run (around 12.7 mag). This object may be eclipsing and further observations are recommended.

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[vsnet-alert 27424] Re: CX137 = CXO GBSJ175553.2-281633 = OGLE BLG-ELL-12042 outburst
by Taichi Kato 18 Feb '23

18 Feb '23

Re: CX137 = CXO GBSJ175553.2-281633 = OGLE BLG-ELL-12042 outburst Itoh-san provided astrometry: RA:17 55 53.13 DEC:-28 16 35.4 The location is a few arcseconds different from that of CX137. The outbursting object may not be CX137 and could be a different type of outbursting object (such as a nova). CX137: 175553.262 -281633.96 (2000.0) Gaia_EDR3_4062657359687091584 plx=1.130(0.049) dismod=9.7 pmra=1.164(0.052) pmdec=-6.889(0.035) G=16.223 BP=16.755 RP=15.373

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[vsnet-alert 27423] CX137 = CXO GBSJ175553.2-281633 = OGLE BLG-ELL-12042 outburst
by Taichi Kato 17 Feb '23

17 Feb '23

CX137 = CXO GBSJ175553.2-281633 = OGLE BLG-ELL-12042 outburst Yamamoto-san detected an outburst, which can be identified with the above source (identified by Yamamoto-san; crowded fielded and still waiting for accurate astrometry). This object has a CV spectrum with ELL variation. Likely an outburst from a long-Porb, low mass-transfer CV. YYYYMMDD(UT) mag observer 20221018.0161 16.052g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20221018.0174 16.155g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20221018.0186 16.760c (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20221018.0186 15.968g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20221018.0218 16.741c (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20221018.0272 16.734c (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20221018.0372 16.765c (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20221020.0186 16.040g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20221020.0199 15.903g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20221020.0212 15.908g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20221021.0128 15.862g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20221021.0141 15.938g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20221021.0153 <16.106g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20221021.0377 16.792c (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20221021.0409 16.820c (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20221021.0468 16.768c (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20221021.0573 16.778c (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20221022.0122 15.867g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20221022.0134 16.057g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20221022.0146 15.908g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20221023.0191 16.105g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20221023.0203 16.137g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20221023.0216 15.889g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20221023.7673 16.035o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20221023.7877 15.912o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20221025.7776 <15.434g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20221025.7788 <15.575g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20221025.7800 <15.748g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20221026.0056 16.517c (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20221026.0088 16.494c (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20221026.0142 16.608c (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20221026.0255 16.516c (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20221026.0367 15.821g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20221026.0380 15.883g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20221026.0393 <16.159g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20221026.7961 16.371o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20221026.7993 16.387o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20221026.8072 16.468o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20221026.8173 16.499o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20221027.7476 <15.552g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20221027.7488 <15.604g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20221027.7501 <15.734g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20221031.7564 16.280o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20221031.7601 16.176o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20221031.7657 16.213o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20221031.7758 15.736o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20221106.0088 16.644o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20221106.0179 16.836o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20221106.0283 16.626o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20221108.7632 15.572o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20221111.0100 15.853o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20221111.0150 16.018o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20221111.0245 15.974o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230204.3841 <15.478g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20230204.3854 <15.678g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20230205.3822 <15.174g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20230205.3835 <15.340g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20230206.3789 <15.374g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20230206.3802 <15.469g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20230206.3816 15.569g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20230207.3745 15.477g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20230207.3758 <15.692g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20230207.3771 <15.589g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20230209.3731 <15.670g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20230209.3744 <15.633g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20230209.3757 <15.738g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20230210.3835 15.388g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20230210.3847 <15.552g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20230210.3860 <15.538g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20230212.3423 14.911o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230212.3455 14.821o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230212.3586 14.807o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230212.3666 14.705g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20230212.3679 14.665g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20230212.3691 14.862g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20230216.837 130c (Minoru Yamamoto)

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[vsnet-alert 27422] DV UMa likely superoutburst
by Taichi Kato 17 Feb '23

17 Feb '23

DV UMa likely superoutburst YYYYMMDD(UT) mag observer 20230202.6352 <156c (Yutaka Maeda) 20230204.6272 <152c (Yutaka Maeda) 20230205.6435 <147c (Yutaka Maeda) 20230207.6782 <146c (Yutaka Maeda) 20230210.7280 <152c (Yutaka Maeda) 20230211.701 <178C (Mitsutaka Hiraga) 20230211.8030 <174C (Masayuki Moriyama) 20230213.994 <147 (Gary Poyner) 20230215.7107 143cG (Yutaka Maeda)

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[vsnet-alert 27421] GO Com unusually short superoutburst
by Taichi Kato 16 Feb '23

16 Feb '23

GO Com unusually short superoutburst Already faded. YYYYMMDD(UT) mag observer 20230121.7559 <152c (Yutaka Maeda) 20230123.4261 18.045zr (ZTF Alert DC mag (Masci+ 2019)) 20230125.3831 18.705zg (ZTF Alert DC mag (Masci+ 2019)) 20230127.4149 18.036zr (ZTF Alert DC mag (Masci+ 2019)) 20230130.7041 <157c (Yutaka Maeda) 20230130.9972 <142 (Eddy Muyllaert) 20230202.3882 14.367zr (ZTF Alert DC mag (Masci+ 2019)) 20230204.6995 131cG (Yutaka Maeda) 20230205.112 134 (Gary Poyner) 20230207.6675 132:cG (Yutaka Maeda) 20230208.051 136 (Gary Poyner) 20230210.7140 138cG (Yutaka Maeda) 20230210.7140 138cG (Yutaka Maeda) 20230213.066 14.79C (Gary Poyner) 20230214.032 <148 (Gary Poyner) 20230214.6976 <156c (Yutaka Maeda)

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