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Confirmation of the Luminous Transient CSS110406:135058+261642 (=PTF11dij)

ATel #3344; R. M. Quimby (Caltech), A. Sternberg (Weizmann Institute), and T. Matheson (NOAO) report on behalf of the PTF Collaboration
on 12 May 2011; 23:24 UT
Credential Certification: Robert Quimby (quimby@astro.as.utexas.edu)

Subjects: Optical, Supernovae, Transient

Referred to by ATel #: 3351

The Palomar Transient Factory (Law et al., 2009; Rau et al., 2009) detected a source, PTF11dij, on 2011 March 30 at RA = 13:50:57.77, Dec = +26:16:42.8 (J2000), which is consistent with the position of CSS110406:135058+261642 (Drake et al. ATel#3343). The source was first detected at about 21 mag in the g-band, and brightened to about 17.7 mag by May 5.

Spectroscopic follow-up was performed with the KPNO 4m telescope (+RC Spectrograph) on May 11. We find narrow emission lines, presumably from the host galaxy, which indicate a redshift of z=0.143. This is consistent with the value reported by Drake et al. (ATel#3343). At this redshift, our photometry indicates a peak of about -21.5 mag. Over all, the spectra show a blue continuum with subtle line features. We find a reasonable match to the luminous, hydrogen poor supernova PTF09cnd at about 1 week past maximum light, however the characteristic OII mutiplet is not strongly detected (Quimby et al. 2011, Nature, in press).