Central Bureau for Astronomical Telegrams

CBAT "Transient Object Followup Reports"

TCP J06373299-0935420

TCP J06373299-0935420   2019 02 21.4516*  06 37 32.99 -09 35 42.0  10.4 U             Mon       2 0

2019 02 21.452

Discovered by S. Kaneko, Kakegawa, Shizuoka-ken, Japan, with on 10-s exposure on eight frames using Canon 6D digital camera + 200-mm f/2.8 lens under the limiting mag = 14.5, who writes that nothing is visible at this location on a frame taken on 2019 Feb. 20.447 UT with limit mag.= 14.7.

2019 02 21.65

A (blue) progenitor candidate from Gaia DR2 is 0.3" away at R.A. 06h37m33.004s, Decl. -09°35'42.15" (equinox J2000.0, epoch 2015.5; Gmag. 19.21, parallax 2.7192 ± 0.4374 mas, distance ~0.38 kpc). Other designations are USNO-A2.0 0750-02439919 (Bmag. 18.6, Rmag. 18.9), USNO-B1.0 0804-0087491, GSC2.3 S3BJ014199 (Fmag. 18.9, Bjmag. 19.4), WISE J063733.02-093541.9, PSO J063733.002-093542.127 (gmag. 19.47, rmag. 19.32). Observations by the ASAS-SN Sky Patrol (Shappee et al. 2014ApJ...788...48S and Kochanek et al. 2017PASP..129j4502K) of the current brightening: 2019 Feb. 13.291 UT, gmag. fainter than 16.45; 21.156, gmag. 12.56; no previous eruptions or outbursts were recorded since 2012 Jan. 29; complete light curve at https://asas-sn.osu.edu/light_curves/aef18120-7c35-4b28-9a31-2e083608bf8f --- Patrick Schmeer (Saarbrücken-Bischmisheim, Germany)

2019 02 21.7456

This transient was observed on 2019 02 21.7456 by G. Masi, remotely using the 17"-f/6.8 robotic unit part of the Virtual Telescope Project facility, at Bellatrix Astronomical Observatory in Ceccano, Italy. 15-seconds exposures, unfiltered, show the source at mag. 10.3 (R mags for the reference stars from Gaia DR1). We also performed astrometry, getting the following end figures: 32.99; 42.1 (J2000.0, mean residuals of 0.1" on both axes).

2019 02 21.78

Meanwhile the All-Sky Automated Survey for Supernovae reported (on "Thu Feb 21 12:48:54 EST") this transient as ASASSN-19de: "RA 06:37:32.98, Dec -09:35:42.4, discovery 2019-02-21.15 UT, gmag. 12.16; bright CV candidate, matches to PS1 g=19.5, g>17.3 on 2019-02-13.29, g=12.6 on 2019-02-21.16." http://www.astronomy.ohio-state.edu/~assassin/transients.html --- Patrick Schmeer (Saarbrücken-Bischmisheim, Germany)

2019 02 22.8476

Preliminary photometry result: V = 11.06 +/- 0.05 mag. (552 reference stars from USNO-B1.0). Astrometry: RA = 06 37 33.00, Dec.= -09 35 42.2 (J2000.0, 389 reference stars from USNO-B1.0, mean residuals of 0.15" on both axes) (K. Sarneczky, 0.60-m Schmidt, Konkoly Observatory, Hungary)