NGC 3191 and the hydrogen-poor superluminous supernova SN 2017egm: 23 June 2017
On 23 May 2017, the Gaia Photometric Science Alerts programme reported the discovery of an apparent supernova, later designed SN 2017egm. It turned out to be the closest hydrogen-poor superluminous supernova (SLSN-I) ever found....
