Supernova SN2011by was discovered by Zhangwei Jin, Ningbo, Zhejiang, China, and Xing Gao, Urumqi, Xinjiang, China on April 26, 2011.  SN2011by occured in NGC3972 in the constellation of Ursa Major.  Originally reported at magnitude 14.2 on April 26th, by May 1st, this had changed to magnitude 13.

Image taken with Pentax 75 and SX-VR H36 on Sunday 1st May at 23:00BST.  Inset on image above shows galaxy pre SN event.

Thanks for looking

Steve