[vsnet-alert 22018] TCP J07134590-2112330: new transient (12.0 mag) in Canis Major

[Patrick Schmeer pasc1312-aavso@yahoo.de via vsnet-alert]

TCP J07134590-2112330 (UG:)

RA 07h13m45.90s, DEC -21°12'33.0" (J2000.0)
2018 March 24.4964 UT, 12.0 mag (CCD, unfiltered)
Discoverer: Yuji Nakamura (Kameyama, Mie, Japan)

2018 03 24.4964 UT
Yuji Nakamura, Kameyama, Mie, Japan, reports his discovery of this
TCP (mag 12.0) in CMa on a CCD frame taken on 2018 Mar 24.4964 UT
(limiting mag 15.1) using a 10cm reflector F3.0 telescope. He
confirmed this object on other 3 frames taken on the same night.
The object was not shown on a frame taken on 2018 Mar 17.5107 UT
(limiting mag 15.4).

2018 03 24.79 UT
USNO-B1.0 0687-0122255 (07 13 45.83 -21 12 27.3, R= 19.6 mag;
G= 20.21 mag in Gaia DR1) is 5.4" away, the nearest Pan-STARRS1
source (07 13 45.84 -21 12 31.3, g= 21.55 mag) is 1.9" away from
the transient's position. No previous outbursts or eruptions were
recorded by the ASAS-SN Sky Patrol (Shappee et al. 2014ApJ...788
...48S and Kochanek et al. 2017PASP..129j4502K) in 2012 February
and since 2014 December; latest available observation:
2018 March 23.153 UT, V= 15.5 mag (contaminated by a 15 mag star
9" away):
https://asas-sn.osu.edu/light_curves/b38524a4-4dff-49e8-af69-18d14ce7406a
--- Patrick Schmeer (Saarbrücken-Bischmisheim, Germany)

2018 03 24.831 UT
Visual magnitude estimate by P. Schmeer, Bischmisheim, Germany:
2018 Mar. 24.831 UT, 12.8 (203-mm Schmidt-Cassegrain telescope).

Follow-up reports:
http://www.cbat.eps.harvard.edu/unconf/followups/J07134590-2112330.html

Spectroscopy, time-resolved photometry, and precise astrometry are
urgently required.

Clear skies,
Patrick