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Supernova candidate HFF14Jan discovered in HST observations of a z=0.24 spiral galaxy in the foreground of the Abell 370 galaxy cluster

ATel #6758; O. Graur (NYU/AMNH), S. A. Rodney (JHU), L.-G. Strolger (STScI), A. Molino (IAG-USP), P. L. Kelly (UC Berkeley), and the FrontierSN and GLASS Teams
on 26 Nov 2014; 21:22 UT
Credential Certification: Or Graur (orgraur@nyu.edu)

Subjects: Infra-Red, Optical, Supernovae, Transient

We report the discovery of supernova candidate HFF14Jan (SN "Janeway") in Hubble Space Telescope (HST) Wide Field Camera 3 F625W, F814W, F110W, and F160W images of the Abell 370 (z=0.375) galaxy cluster field. The HST images were acquired on 2014 November 25 (UT) as part of the Frontier Fields Supernova Search (HST PID: 13790) to follow up supernovae discovered in the Frontier Fields. We measure initial discovery magnitudes (AB) of F625W=21.505+/-0.008, F814W=21.68+/-0.01, F110W=22.479+/-0.008, and F160W=22.92+/-0.01 mags. We measure a photometric redshift of z=0.24+0.07-0.20 for the host spiral galaxy, placing it in front of the galaxy cluster. HFF14Jan is located at RA=02:39:51.824, Dec=-01:35:21.97 (J2000). A finding chart is available at http://archive.stsci.edu/pub/ffsn/abell370/janeway_finder.pdf . Additional HST F110W and F160W images of this field are scheduled for 2014 December 8 and spectroscopic follow up has been added to the Gemini queue.