Discovery of an intermediate luminosity transient iPTF13cjz in NGC 772
ATel #5272; O. Yaron (Weizmann), M. M. Kasliwal (Carnegie/Princeton), S. B. Cenko (NASA/GSFC), Y. Cao, A. Waszczak (Caltech), I. Arcavi, D. Tal (Weizmann), K. Clubb, P. L. Kelly, O. Fox, A. V. Filippenko (UC Berkeley), report on behalf of the iPTF collaboration
on 13 Aug 2013; 17:01 UT
Distributed as an Instant Email Notice Transients
Credential Certification: Mansi Manoj Kasliwal (firstname.lastname@example.org)
Subjects: Infra-Red, Optical, Supernovae, Transient
The intermediate Palomar Transient Factory (ATel#4807) reports the discovery of an optical transient, iPTF13cjz, in the spiral arm of NGC772 (~30.3 Mpc; NED). iPTF13cjz was discovered on 2013 August 02.36 UT at RA(J2000) = 01:59:14.47, DEC(J2000) = +19:01:33.6, at 18.9 mag in the PTF R-band (calibrated wrt SDSS), which corresponds to absolute magnitude of -13.5. A follow-up spectrum was promptly obtained on Aug 02.54 (~2.5 hours from event confirmation) with Keck2-DEIMOS and shows low-velocity P-Cygni profiles, absorption and emission lines of H, HeI, NII and various intermediate-mass and Fe-group elements (OI, NaI, MgI, CaII, FeII). The emission lines resemble those of luminous blue variables(e.g. UGC 2773 OT2009-1; Smith et al. 2010) but the underlying red continuum is more reminiscent of intermediate luminosity red transients (e.g. PTF10fqs; Kasliwal et al. 2011). Moreover, follow-up near-infrared photometry with Reionization and Transients Infrared Camera (RATIR; www.ratir.org) on Aug 10 confirms the red color of R-H = 2.0 mag. We note that this transient was independently discovered by LOSS/KAIT and reported as a TOCP on Aug 12.