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TCP J08371988-0602457: new transient (13 mag) in Hydra

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TCP J08371988-0602457: new transient (13 mag) in Hydra

TCP J08371988-0602457 = CSS_J083720.2-060242? (UG:)

Discovery details:
R.A. 08h37m19.88s, Decl. -06°02'45.7" (J2000.0)
Independent discoverers: Tadashi Kojima (Gunma-ken, Japan), Shigehisa Fujikawa (Kan'onji, Kagawa, Japan)

2018 10 20.782 UT
Discovered by T. Kojima, Gunma-ken, Japan, on three frames with five second exposure using Canon EOS 6D digital camera + 200-mm f/3.2 lens under the limiting mag = 14.1, who writes nothing is visible at this location on a frame taken on 2017 Nov. 28 UT with limit mag.= 13.5.

2018 10 20.7682 UT
Independently discovered by Shigehisa Fujikawa, Kan'onji, Kagawa, Japan, on a frame taken on 2018 Oct 20.7682 using a Minolta 120-mm-f.l. f/3.5 camera lens. His position end figures are 20s.13, 41".0 and his estimation of the magnitude is 12.3.

2018 10 21.13 UT
A possible progenitor is CSS_J083720.2-060242, magnitude range from Catalina Real-time Transient Survey (CRTS) data about 19.3–21.0. Gaia DR2 position end figures are 20.23s, 43.7" (J2000.0, Ep. 2000.0); proper motion pmRA= -17.8, pmDE= +10.8 mas/yr. Other designations are USNO-B1.0 0839-0186052, GSC2.3 S3LG001777, PSO J083720.218-060243.557. No outbursts were recorded by the ASAS-SN Sky Patrol (Shappee et al. 2014ApJ...788...48S and Kochanek et al. 2017PASP..129j4502K) since 2012 Feb. 11; latest available observation is 2018 Oct. 17.592 UT, Vmag. 16.5 (contaminated by nearby stars); complete light curve at --- Patrick Schmeer (Saarbrücken-Bischmisheim, Germany)

*** Precise astrometry, time-resolved photometry, and spectroscopy are urgently required. ***

Clear skies,

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