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ATEL # 2315; E. Christensen (Gemini Observatory); A.J. Drake, S.G. Djorgovski, M.J. Graham, A.A. Mahabal, R. Williams (Caltech); M. Catelan (PUC); J. Prieto (OCIW); E.C. Beshore, S.M. Larson, A. Boattini, A. Gibbs, A. Grauer, R. Hill, R. Kowalski (LPL/UA)
on 26 Nov 2009; 7:33 UT
Password Certification: Andrew J. Drake (firstname.lastname@example.org)
Subjects: Optical, Nova, Supernova, Transients
We carried out spectroscopic follow-up of Catalina Real-time Transient Survey (CRTS) supernova candidates with the Gemini South telescope on Nov. 10 UT, and the Gemini North telescope on Nov. 19 UT, with the following results:
|ID||Disc. Date||RA||Dec||Disc. Mag||Type||M_V||z|
Notes: Peak absolute magnitudes had been derived from SN spectroscopic redshifts and CSS photometry. No host galaxy is seen in SDSS images reaching r~22 for CSS091017:082858-003512 suggesting that the host has Mr > -14.7. CSS091018:091109+195945 (ATEL#2266) has a host galaxy with SDSS r=21.7, suggesting that the host has Mr=-17.6. CSS090925:001259+144121 (ATEL#2266) is associated with a very faint uncatalogued host galaxy seen in SDSS images. We estimate this to be r~22, suggesting the host has Mr ~ -16.
CSS091017:0828580-003512 is very bright for a type-IIp supernova and lies within a very faint host galaxy similar to the type-IIp SN 2009cy. The type-IIn's, CSS091018:091109+195945 and CSS090925:001259+144121, are also over-luminous SN and are thus similar to a number of similar discoveries by CRTS (eg. SN 2008fz, SN 2008iy and SN2008ja). These events provide additional evidence for a link between long-timescale, bright, type-IIn SN and intrinsically faint galaxies.
More information can be found at http://crts.caltech.edu
Follow-up is requested.