Central Bureau for Astronomical Telegrams

CBAT "Transient Object Followup Reports"

PSN J23501925+1637562

PSN J23501925+1637562   2012 08 18.03  *  23 50 19.25 +16 37 56.2  18.1 U  7.3E 2.4N  P1513303  9 9

2012 08 18.02

V. Lipunov (SAI MSU) reports the discovery by P. Podvorotniy of a possible supernova (magnitude 18.1) on two unfiltered 180-s images obtained with 0.40-m f/2.5 MASTER-Kislovodsk robotic telescope + 16-megapixel CCD on 2012 Aug. 18.02 and 18.03 UT. The object is located 7".3 east and 2".4 north of the nucleus of PGC 1513303. Object was not present on MASTER-Kislovodsk unfiltered image taken on 2010 Dec. 23.66 UT (limiting magnitude 20.3m). Discovery and reference images are posted at http://master.sai.msu.ru/static/OT/235019.25163756.2_1.png

2012 08 09.73

D. Denisenko (SAI MSU), V. Yurkov and E. Sinyakov (Blagoveschensk Educational State University) report on behalf of a larger MASTER collaboration that this possible supernova was marginally visible on 60-s unfiltered survey images taken by 0.40-m f/2.5 MASTER-Amur robotic telescope on 2012 Aug. 09.73 and 09.76 UT, 9 days before the detection by MASTER-Kislovodsk. Comparison of Aug. 9 MASTER-Amur and Aug. 18 MASTER-Kislovodsk images is posted at http://master.sai.msu.ru/static/OT/PSNJ23501925+1637562-Amur120809.jpg