Central Bureau for Astronomical Telegrams

CBAT "Transient Object Followup Reports"

PSN J09093506+3307221

PSN J09093506+3307221   2015 04 07.7367*  09 09 35.06 +33 07 22.1  17.8 U   15E   2S  N2770     R 9

2015 04 07.7367

Possible supernova in NGC 2770 discovered by Zhijian Xu(Nanjing,Jiangsu,China) and Xing Gao (Urumqi,Xinjiang,China) in Xingming Observation Sky Survey(C42) around Apr.07.73669 UT. using an unfiltered CCD ( + Celestron C14 Schmidt-Cassegrain telescope D=356-mm @f/6.9 ). The new object approximately located at R.A.=09h 09m 35s.06 Decl.=+33°07'22".1(equinox 2000.0). Which is about 15.2" east and 2.6" south of the center of the NGC 2770. Nothing is visible at this position on archival images taken on Mar.22(limiting mag 19.0), Mar.24(limiting mag 18.7), or on the DSS from Apr.21,1998(limiting mag about 19.6).All images can be seen from: http://www.xjltp.com/XOSS/XM71ZX/XM71ZX.htm

2015 04 09.7159

We confirmed this object at Apr 09.71590 UT in two 60s images. C2015 04 09.71590 09 09 35.04 +33 07 21.6 18.0 V C42,Xingming Observatory,Mt. Nanshan. Observers Zhijian Xu,Xing Gao,Measurers Zhijian Xu 0.36-m f/6.9 Schmidt-Cassegrain telescope and CCD.

2015 04 09.7159

Sorry for the report of possible supernova in NGC 2770. We find it is the same LBV reported by Catalina Real-Time Transient Survey and Stan Howerton in 2015/02/07.390. Zhijian Xu, Xingming Observation Sky Survey(C42)

2015 05 16.9275

This LBV originally reported by Catalina Real-Time Transient Survey and Stan Howerton in 2015/02/07.390 appears to have erupted significantly and *may* have evolved into a genuine SN. When imaged last night on 2015 05 16.92755 U.T. I estimated it to have risen to unfiltered mag. 16.0. with end figures of 35.11s and 22.2". Ron Arbour South Wonston U.K.