------------------------------------------------------------------- THE ASTRONOMER Electronic Circular No 2932 2013 Jly 23 14.33UT 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 ------------------------------------------------------------------- BLAZAR: 1FGL J2322.0+3208 (= TXS 2319+317 = B2 2319+31) V. Yecheistov, Moscow State University et. al., report on The Astronomer's Telegram 5218 an historical brightest state of blazar TXS 2319+317. MASTER-Amur auto-detection system discovered an Optical Transient source (OT) at RA 23h 21m 54.95s DEC +32d 04m 07.4s on 2013 July 13.702UT. The OT unfiltered magnitude is 16.3m (limit 18.4m). The OT is seen in 8 images. A reference image without the OT was obtained on 2012 August 09.708UT with unfiltered magnitude limit 19.0m. The object was also observed by MASTER-Kislovodsk on 2013 July 19.898UT at 16.5m. The OT is identical to quasar TXS 2319+317 aka B2 2319+31 which is also a known radio and gamma-ray source 1FGL J2322.0+3208 detected by Fermi-LAT. Its redshift was determined to be z=1.489. The blazar shows large variability on the digitised Palomar plates having changed its brightness by more than three magnitudes between 1st and 2nd POSS epochs. This is obvious in USNO-B1 catalogue data for USNO-B1.0 1220-0648964 B1=17.92 R1=16.34 B2=20.88 R2=19.96). Images: http://master.sai.msu.ru/static/OT/J232154+320407-DSS.jpg The object is present in SDSS as SDSS J232154.95+320407.5 with the following magnitudes: u=23.07 g=20.82 r=20.02 r=20.66 i=19.30. Thus, TXS 2319+317 = 1FGL J2322.0+3208 is currently at its historical brightest state in the optical band. SUPERNOVA 2013dd (V. SHUMKOV) 2013dd May 27.86 15 36 05.15 +13 57 06.9 17.5 9.3"E 3.6"N L. Tomasella: spectrum June 6 type-Ia two weeks after maximum. The expansion velocity, deduced from the Si II 635.5-nm absorption, is about 11000 km/s. SUPERNOVA 2013de (CATALINA REAL-TIME TRANSIENT SURVEY) 2013de May 31.18 10 02 07.97 +11 57 05.2 18.0 7.5"W 7.2"S L. Tomasella: spectrum June 6 type-Ia about a month after maximum SUPERNOVA 2013df IN NGC 4414 (ITALIAN SUPERNOVA SEARCH) 2013df Jun 7.87 12 26 29.33 +31 13 38.3 14.4 32 "E 14 "N S. B. Cenko: spectrum June 10 Keck II type-II and may evolve to type-IIb. SUPERNOVA 2013dg (CATALINA REAL-TIME TRANSIENT SURVEY) 2013dg May 17.26 13 18 41.35 -07 04 43.0 19.5 S. J. Smartt: spectrum June 10 4.2-m William Herschel Telescope No host galaxy is visible in the CSS or MLS deeper reference images, and no narrow host- galaxy emission lines are observed in the WHT spectrum (e.g., H-alpha, H-beta, or [O III], [O II]). SUPERNOVA 2013dh IN NGC 5936 (LOSS) 2013dh Jun 12.33 15 30 01.09 +12 59 12.9 18.0 3.7"E 8.6"N S. B. Cenko: spectrum June 14 Shane 3-m type-Ia pre-maximum SUPERNOVA 2013di IN NGC 7321(CATALINA REAL-TIME TRANSIENT SURVEY) 2013di Jun 12.38 22 36 27.46 +21 36 54.3 18.2 7.8"W 24.2"S S. B. Cenko: spectrum June 14 Shane 3-m type-Ia shortly before maximum Guy M Hurst