[ Previous | Next | ADS ]

Possible explosion of the SN impostor in NGC 2770

ATel #7514; A. de Ugarte Postigo (IAA-CSIC, DARK/NBI), C. C. Thoene (IAA-CSIC), G. Leloudas (Weizmann, DARK/NBI), F. Aceituno (IAA-CSIC)
on 16 May 2015; 10:24 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Antonio de Ugarte Postigo (adeugartepostigo@gmail.com)

Subjects: Optical, Supernovae

Referred to by ATel #: 7515, 7517, 7541, 7543

We have been monitoring the SN impostor in NGC 2770 (Elias Rosa et al. ATel#7042, de Ugarte Postigo et al. ATel#7409) with the 1.5m and 0.9 m telescopes at Sierra Nevada Observatory (Granada, Spain). An observation obtained on 20150515 (20:45 UT) shows that the transient (also known as PSN J09093496+3307204 and SNhunt275) has brightened to R = 16.0 mag, corresponding to an absolute magnitude of M_R = -16.4 mag. The transient was more than 2 mag fainter in images obtained 9 days before.

We suggest that the impostor is experiencing an evolution similar to SN 2009ip in August/September 2012 (e.g. Mauerhan et al. 2013, MNRAS, 430, 1801, Pastorello et al. 2013, ApJ, 767, 1) and that it is possible that the progenitor star has exploded. We encourage observations at all wavelengths.