Central Bureau for Astronomical Telegrams

CBAT "Transient Object Followup Reports"

PNV J13532700-6725110

PNV J13532700-6725110   2018 01 19.708 *  13 53 27.00 -67 25 11.0   9.1 U             Cir       9 1

2018 01 19.708

Possible new nova in Circinus. Discovered by John Seach, Chatsworth Island, NSW, Australia. DSLR with 50 mm f/1.2 lens. Object visible on 3 images. No object identified at position on 3 images taken with same instrument on Jan 18.7 UT. No minor planet or variable star at position. No object on DSS2-red.

2018 01 19.80

A Gaia DR1 source (position end figures 26.92s, 10.47"; G= 18.10 mag) is located only 0.7" from the reported position of the transient. Further designations: USNO-A2.0 0225-18431574 (B= 19.2, R= 17.7 mag), USNO-B1.0 0225-0595724, 2MASS J13532702-6725105, NOMAD1 0225-0600516, XPM 045-0587677. According to ASAS-SN Sky Patrol observations (Shappee et al. 2014ApJ...788...48S and Kochanek et al. 2017PASP..129j4502K) this eruption began very recently: 2018 Jan. 18.341 UT, V= 15.75 mag (probably contaminated by nearby stars); 19.339, 9.00: https://asas-sn.osu.edu/light_curves/c57f176f-f41b-4c47-be49-581739797b28 --- Patrick Schmeer (Saarbrücken-Bischmisheim, Germany)

2018 01 19.84

No previous eruptions or outbursts of this object were detected by the ASAS-SN Sky Patrol since 2016 February (when apparently observations of this region started): https://asas-sn.osu.edu/light_curves/cc250347-447a-4d9e-9d76-ef0ce071e66c --- Patrick Schmeer (Saarbrücken-Bischmisheim, Germany)

2018 01 20.158

Andres Chapman (Argentina) reports V= 9.12 mag on 2018 Jan. 20.15848 UT (40-sec exposure) and co-ordinates RA 13h53m27.60s, DEC -67°25'00.7" (J2000.0; accuracy about 0.3"). A Gaia DR1 source (position end figures 27.59s, 00.9"; G= 17.28 mag) is located only 0.3" from this position, and the UV source GALEX J135327.5-672500 (position end figures 27.57s, 00.7"; NUV= 18.9 mag) is only 0.2" away. ASAS-SN Sky Patrol observations using the co-ordinates provided by Chapman: 2018 Jan. 18.341 UT, V= 15.7 mag (probably contaminated by nearby stars); 19.340 UT, V= 8.7 mag: https://asas-sn.osu.edu/light_curves/ba602dc4-de20-40d7-9995-b6d047036d09 --- Patrick Schmeer (Saarbrücken-Bischmisheim, Germany)

2018 01 20.5916

Strong hydrogen emission line was detected in my low-resolution spectroscopic image taken with T17 0.43-m f/6.8 CDK astrograph + FLI PL4710 CCD at SSO, NSW, Australia. http://meineko.sakura.ne.jp/ccd/PNV_J13532700-6725110-spe.jpg Seiichiro Kiyota.

2018 01 20.5868

Photometry results were B=8.62, V=8.48, Rc=8.37 and Ic=8.22 with T17 0.43-m f/6.8 CDK astrograph + FLI PL4710 CCD at SSO, NSW, Australia. Seiichiro Kiyota (Kamagaya, Japan)

2018 01 20.6017

Following the posting on the Central Bureau's Transient Object Confirmation Page about a possible Nova in Cir (TOCP Designation: PNV J13532700-6725110) I performed some follow-up of this object through a TEL 0.43-m f/6.8 reflector + CCD from MPC Code Q62 (iTelescope Observatory, Siding Spring). On images taken on January 20.6, 2018 I can confirm the presence of an optical counterpart with R-filtered CCD magnitude +8.09 & V-filtered CCD magnitude +8.33 at coordinates: R.A. = 13 53 27.57, Decl.= -67 25 01.0 (equinox 2000.0; Gaia DR1 catalogue reference stars). My confirmation image (single unfiltered 60-sec exposure through a 0.43-m f/6.8 reflector + CCD; MPC Code Q62): http://bit.ly/2Dlr6Ko - An animation showing a comparison between the confirmation image and the archive POSS2/UKSTU Red plate (1997-03-31): http://bit.ly/2DkMlw4 by Ernesto Guido