Characterization of CRTS SNe with Gemini
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; 07:33 UT
Credential Certification: Andrew J. Drake (email@example.com)
Subjects: Optical, Supernovae, Transient
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
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.