Discovery of a Possible Supernova in a Red Sequence Member of a z=0.31 Rich Galaxy Cluster from SIRCLS
ATel #5072; M. L. Graham (LCOGT, UCSB), D. J. Sand (Texas Tech), C. J. Pritchet (U. of Victoria), J. Richard (CRAL), D. Zaritsky (U. of Arizona), H. Hoekstra (Leiden U.), C. J. Bildfell (U. of Victoria), M. Gladders (U. of Chicago), H. Ebeling (IfA), J. P. Kneib (OAMP), J. Kezwer (U. of Victoria), S. Fabbro (U. of Victoria), R. Gavazzi (IAP), M. Limousin (OAMP), E. Jullo (OAMP), and J. Parrent (LCOGT, Dartmouth)
on 17 May 2013; 22:50 UT
Credential Certification: Melissa Lynn Graham (mgraham@lcogt.net)
Subjects: Optical, Supernovae
We report the discovery of a possible supernova within 0.07 Mpc of the rich galaxy cluster GHO1320 (RA=13:22:48.00 Dec=+31:39:17.0) at redshift z=0.31. This PSN was detected in r-band difference images obtained with MegaCam at the Canada-France-Hawaii Telescope on UT 2013-05-14, and is not detected in a previous image taken on UT 2013-04-17. These data were obtained as part of the Survey at Intermediate Redshifts for Cluster and Lensed Supernovae (SIRCLS). The coordinates of this PSN are RA=13:22:47.9 Dec=31:39:10.22. It is observed to have an r'-band apparent magnitude of 21.3 on UT 2013-05-14. The PSN appears to be hosted by a small red galaxy with apparent SDSS magnitudes of g=21.97 and r=20.48, and a color g-r=1.49. This is consistent with the host being a red sequence member of the galaxy cluster. Assuming a flat cosmology with Omega_M=0.27, the distance modulus to this galaxy cluster is 41.0, and the estimated intrinsic magnitude of this source is M_B=-19.3. This is consistent with a Type Ia supernova at maximum light (note that a k-correction appropriate for near-max SNeIa was included). Follow-up spectroscopy is encouraged (please email for a finder chart).
