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M31N2008-11b is a Galactic Dwarf Nova

ATel #1867; M. M. Kasliwal, R. Quimby, S. R. Kulkarni (Caltech)
on 8 Dec 2008; 04:28 UT
Credential Certification: Mansi Manoj Kasliwal (mansi@astro.caltech.edu)

Subjects: Cataclysmic Variable, Nova, Transient, Variables

Referred to by ATel #: 2286

We observed M31N2008-11b (K. Itagaki, CBET#1588) with the Double Beam Spectrograph on the Palomar Hale 5-m telescope on UT Dec 4.221. This spectrum has a steep blue continuum, very narrow emission in H-alpha and broad absorption in H-beta through at least H-eta. Further, there is a faint blue counterpart in SDSS DR Supplement g-band imaging (g=22.8, r > 23.3). Given the reported peak magnitude of 14.5 (CBET#1588), this outburst had an amplitude of >8 mag. We suggest that this optical transient is an SU-UMa-like superoutburst in our own galaxy similar to HS2219+1824 (Rodriguez-Gil et al 2005).