Possible SN detected in HST/WFC-IR
ATel #3440; Steven Rodney (Johns Hopkins University)
on 20 Jun 2011; 12:42 UT
Distributed as an Instant Email Notice Transients
Credential Certification: Steven A. Rodney (firstname.lastname@example.org)
Subjects: Infra-Red, Optical, Supernovae, Transient
Teddy F. Frederiksen and Steven Rodney, on behalf of the HST Higher-z SN team (PI A. Riess) report the discovery of an optical/near-infrared transient (possible supernova) found in the subtraction images generated from observations taken on May 24 2011 and not detected at any earlier epoch. The observations were taken with HST/WFC3 as part of CANDELS: Cosmic Assembly Near-IR Deep Extragalactic Legacy Survey (HST program 12061, PI S. Faber and H. Ferguson). The position of the transient is RA = 14:19:31.827, Dec = +52:51:55.94 (J2000.0). The following magnitudes are reported: F160W = 22.88, F125W = 23.36, F814W = 23.3. The transient is offset 0.78" from its likely host galaxy. The magnitude of the host is F160W = 19.0. The spectroscopic redshift of the host is z=0.3541. The transient was observed on 2011 05 25 UT with GMOS on Gemini North under program GN-2011A-Q-14 (PI S. Jha), and the spectrum was reduced by T. Matheson. The transient was observed again on 2011 06 03 UT by J. M. Silverman, S. B. Cenko, and A. V. Filippenko using LRIS mounted on the Keck I 10-m telescope. Both spectra were reduced using standard IRAF techniques and our own IDL routines. Both spectra reveal a blue SED with some possible supernova features, but classification is uncertain.
VOevent Page for this transient