------------------------------------------------------------------- THE ASTRONOMER Electronic Circular No 2911 2013 Apr 30 18.41UT 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 ------------------------------------------------------------------- MASTER OT J011613.54+640832.0 - NEW R CRB VARIABLE P. Balanutsa et. al., Moscow State University reports on The Astronomer's Telegram 5030 the discovery using the MASTER-Amur auto-detection system of an optical transient at: RA 01h 16m 13.54s DEC +64d 08' 32.0" (2000). The object was recorded on 2013 Apr 26.690UT at unfiltered magnitude 14.1 (limit 16.9) on 2 images. They have a reference image without the OT on 2012 Apr 18.558UT to a limit of 16.2. The object is identical to IRAS 01129+6352 = 2MASS 01161363+6408319 (J=11.79+/-0.02, H=9.16+/-0.02, K=7.01+/-0.02). It is included in the Catalogue enriched with R CrB stars (Tisserand, 2012) based on near-IR (2MASS) and mid-infrared (WISE) characteristics. However, no variability was mentioned before. The star is present in USNO-B catalog as USNO-B1.0 1541-0038015 (RA 01 16 13.593, Dec +64 08 32.12,R1=18.30, R2=17.14, I=15.56). Color-combined DSS finder chart is uploaded to http://master.sai.msu.ru/static/OT/J011613+640832-BRIR5x5.jpg (5'x5' FOV). The object was at low state during Palomar survey showing little variability between POSS-I and POSS-II plates. However the object was likely at a high state in 1999-2000 during NSVS (ROTSE-I) observations. The light curve of NSVS 1689547 has the variable nearly constant with median ROTSE Mag 13.407, Mag Scatter 0.095 and Median Error 0.074. Such a behaviour is consistent with R CrB nature of this object, as suggested by Tisserand. Follow up photometry and spectroscopy are encouraged. The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/011613.54640832.0.png GRB 130427A Further to TA Circulars 2909 and 2910, observers are alerted to the fact that positive images continue to be obtained and reported, over three days after trigger so this rare object should continue to be monitored. SUPERNOVA 2013az IN ESO 306-16 (CATALINA TRANSIENT SURVEY) 2013az Mar 24.48 05 39 52.13 -40 30 28.1 17.1 15.0"W 16.9"N E. Y. Hsiao: spectrum April 1 type Ia supernova near maximum SUPERNOVA 2013ba (KISS COLLABORATION) 2013ba Apr 4.65 13 52 56.63 +21 56 21.7 19.9 0.7"E 0.8"N The variable was confirmed with the Swope 1-m telescope at Las Campanas Observatory. M. Stritzinger: spectrum Apr 7 normal type-Ia supernova around maximum SUPERNOVA 2013bb IN NGC 5504 (CATALINA TRANSIENT SURVEY) 2013bb Apr 3.42 14 12 13.96 +15 50 31.5 18.4 26.7"W 0.6"N N. Elias-Rosa: spectrum Apr 6 shows young II-b supernova SUPERNOVA 2013bc IN IC 4209 (CATALINA TRANSIENT SURVEY) 2013bc Mar 31.37 13 10 21.31 - 7 10 24.1 18.1 17.6"W 9.6"S E. Y. Hsiao: near-infrared spectrum Apr 3 shows type-Ia a few days before maximum and similar to that of SN 2005am at four days before maximum. Guy M Hurst