Central Bureau for Astronomical Telegrams

CBAT "Transient Object Followup Reports"

PSN J19213020+6108101

PSN J19213020+6108101   2012 04 08.751 *  19 21 30.20 +61 08 10.1  15.7 U    4W  32S  N6796     5 1

2012 04 08.751

Discovered by M. Tsuboi, Hiroshima, Japan, using 0.25-m f/4.7 reflector + unfiltered CCD, who has confirmed the appearance of this star on a frame taken on a day before discovery (2012 April 7.722 UT).

2012 04 09.4355

Object detected at position end figures 30.31, 11.2 (UCAC3). Magnitude 15.8U +/- 0.2 . Limiting magnitude 17.5 . Average of 5 x 60-sec images. Nothing brighter than galaxy background visible at these coordinates on DSS. Observer: R. A. Koff, Bennett, Colorado USA (H09). Image posted at: http://antelopehillsobservatory.org/SNpictures/PSNJ19213020+6108101final.jpg

2012 04 09.4001

L. Elenin (Lyubertsy, Russia) and I. Molotov (Moscow, Russia) confirm an apparent supernova PSN J19213020+6108101 in NGC 6796. Object visible on 3x300sec images remotely taken at ISON-NM Observatory (Mayhill, NM, USA) with 0.45-m f/2.8 telescope + CCD (KAF09000) on Apr. 09.4. Object located at 19h 21m 30s.40 +/- 0".12, +61d 08' 12".1 +/- 0".13 (NOMAD) and have magnitude about 15.1U (mag. limit ~19.2m). Nothing is visible at this position on the POSS and POSSII images. Image of PSN J19213020+6108101 available at http://spaceobs.org/images/TOCP/PSNJ19213020+6108101-20120409.png

2012 04 09.579

Mag.= 15.0 observed by T. Noguchi, Chiba-ken, Japan. Position end figures 30s.36, 12".0 on a frame combined four frames using 0.23-m f/6.3 Schmidt Cassegrain + unfiltered CCD with 50-s exposure under the limit mag.= 18.0. See an image at http://park8.wakwak.com/~ngc/images/PSNinNGC6796.jpg.

2012 04 09.675

Mag.= 15.8 observed by K. Itagaki, Yamagata, Japan. Position end figures 30s.35, 11".4 on a frame using 0.60-m f/5.7 reflector + unfiltered CCD . See an image at http://www.k-itagaki.jp/images/6796.jpg.

2012 04 09.709

Mag.= 15.6 observed by K. Kadota, Saitama-ken, Japan. Position end figures 30s.38, 11".9 on a frame stacked ten frames using 0.25-m f/5.0 reflector + unfiltered CCD with each 60-s exposure. See an image at http://members.jcom.home.ne.jp/kenic-k/image/PSNinNGC6796-20120409.jpg.

2012 04 11.8

Low-resolution spectroscopy (range: 400nm - 800 nm; resolution 0.5nm) was carried out with the 1-m telescope of Bisei Astronomical Observatory (BAO), Okayama, Japan. Despite of poor S/N of the spectrum, preliminary inspection by K. Ayani (BAO) and H. Yamaoka (Kyushu University) of the spectrum reveals P-Cyg profiles of H-alpha and H-beta, whose absorption bottoms are blueshifted by 9000 km/s and 9200 km/s respectively, assuming the heliocentric velocity of NGC 6796 of 2189 km/s (A&AS,130,333(1998)). It is of type-II supernova.

2012 04 10.429

This possible supernova in NGC 6796 was seen with 5 x 15 min images using a luminance filter Astrometry: RA 19 21 30.28 Dec 61 08 10.8 Photometry: 16.1 +/- 0.1 L These data were collected by Joseph Brimacombe, Coral Towers Observatory,Cairns, Australia. Link to image and further information http://www.flickr.com/photos/43846774@N02/6923668714/

2012 04 12.36604

Mag.=16.1, R.A.=19 21 30.35 Decl=+61 08 11.3 (UCAC-3), remotely using the iTelescope T5 0.25-m f/3.4 astrograph + unfiltered CCD (SBIG ST-10XME) at near Mayhill, NM, U.S.A. (H06). Position and magnitude were measured on an image composed from 3-frames which were taken by each 120-seconds exposure under the limiting magnitude = 19.5. Nothing is visible at this location on POSS2/UKSTU (red,1991 Sept.01, limiting mag.= 18.0) Observer T. Yusa, Osaki, Japan. Link to my image; http://space.geocities.jp/yusastar77/supernova/PSNinNGC6796_120412.htm

2012 04 12.11543

This object was observed by Federica Luppi and Luca Buzzi from Schiaparelli Observatory, Varese, Italy. In a stack of images totalling 3 minutes of unfiltered exposure time, the object has position end figures 53s.99, 04".9 and magnitude 15.7. Image posted at URL:http://www.astrogeo.va.it/pub/TOCP/PSN_N6796.jpg

2012 04 25.11

Confirmed as a SNII 10 days after maximum (Tomasella et al. INAF OAPD, Asiago 182cm telescope)

2012 04 23.7

K. Ayani and S. Maeno (Bisei Astronomical Observatory (BAO)) carried out spectroscopy with the same instruments as reported here on Apr. 11.8 UT. Broad (FWHM about 9000 km/s) H-alpha emission line became prominent. The absorption bottom of P-Cyg profile of H-beta is blueshifted by 7500 km/s with respect to the systemic velocity of NGC 6796. Absorpton of Fe II 5169 can be seen. These feature confirm that this object is a type-II supernova. Our spectrum is posted at http://www.bao.go.jp/astro/2012/sn/PSN_J19213020+6108101_Apr23.png.