------------------------------------------------------------------- THE ASTRONOMER Electronic Circular No 3014 2014 Jly 18 12.35UT Ed:Guy M Hurst, 16,Westminster Close, Kempshott Rise, Basingstoke, Hants, RG22 4PP,England.Telephone/FAX(01256)471074Int:+441256471074 INTERNET: GUY@TAHQ.DEMON.CO.UK Backup: gmh@wdcc1.bnsc.rl.ac.uk WORLD WIDE WEB http://www.theastronomer.org ------------------------------------------------------------------- ASAASN-14du During the ongoing All Sky Automated Survey for SuperNovae (ASAS-SN or "Assassin"), using data from the quadruple 14-cm "Brutus" telescope in Haleakala, Hawaii, the team report on ATEL 6308 their discovery of a new transient source, possibly of extreme luminosity, coincident with the galaxy SDSS J131901.64+470057.5: Object RA (J2000) DEC (J2000) Disc. UT Date V mag ASASSN-14du 13:19:01.552 +47:00:56.7 2014-07-08.27 16.1 ASASSN-14du was discovered in images obtained 2014 UT July 08.27 at V~16.1 mag. They also detected the object in images obtained on July 10.26 (V~16.4), July 10.27 (V~16.1), and July 11.26 (V~16.4), but did not detect this object (V>17.5) in images taken on 2014 UT June 27.31 and before. This figure: http://www.astronomy.ohio-state.edu/~assassin/followup/asassn-14du.png shows the ASAS-SN reference image (top-left), archival SDSS g-band image (top-right), ASAS-SN July 08 discovery image (bottom-left), and ASAS-SN July 10 confirmation image (bottom-right). The red circle is centred on the ASAS-SN position of the transient. The ASAS-SN position of ASASSN-14du is approximately 1.0" South and 1.0" West from the core of SDSS J131901.64+470057.5, a faint (g~22.23 mag) galaxy with no spectroscopic redshift. There is no variation reported at this location in CRTS or NEAT data, but there is a source with NUV~22.7 mag detected in GALEX data at these coordinates. The galaxy has a PhotoZ of z=0.186432 +/- 0.078048, which would give the transient an absolute V magnitude (before K-correction) of approx. -23.8 (m-M=39.8, A_V=0.02, Schlafly & Finkbeiner 2011) if we assume this redshift to be correct. Assuming a more modest redshift of z=0.1 gives an absolute V magnitude of approx. -22.3, meaning this transient is possibly extremely luminous even if the actual redshift of the source is significantly lower. SUPERNOVA 2014ba IN NGC 7410 (STUART PARKER) 2014ba May 7.75 22 55 01.97 -39 39 34.5 14.7r 12 "E 6 "N D. Milisavljevic: spectrum May 12 peculiar type-Ia supernova, 1-3 weeks after maximum SUPERNOVA 2014bb IN NGC 5214 (F. CIABATTARI ET AL) 2014bb May 9.06 13 32 49.11 +41 52 15.1 16.5 4 "E 4 "S P. Ochner: spectrum May 14 type-Ia about one week before maximum Guy M Hurst reports V photometry with the Bradford Robotic telescope: 2014 June 5.005UT, 16.3V; July 10.983UT, 16.8V. SUPERNOVA 2014bd (KISS) 2014bd Apr 23.55 14 50 48.07 +09 22 48.3 20.0 1.4"W 5.9"N Nidia Morrell: spectrum May 6 type-II-P. Guy M Hurst