Four Transients in the Pan-STARRS1 3Pi Faint Galaxy Supernova Survey
D. Wright, L. Magill, S. J. Smartt, S. Valenti, R. Kotak, M. McCrum,  K. Smith, T.-W. Chen, M. Fraser (Queen's University Belfast), H. Ledo (Isaac Newton Group), F. Bresolin, R. Kudritzki, J. Tonry, E. Magnier, M. Huber,  K. Chambers, N. Kaiser, J. Morgan, W. Burgett, J. Heasley, W. Sweeney, C. Waters, H. Flewelling (University of Hawaii),  C. Stubbs (Harvard), P. A. Price (Princeton).
Further to Valenti et al. (ATels #2668, #3351) we report the independent discovery of three supernovae and a QSO/AGN in the PS1 3Pi sky survey. PS1-12qn (=MLS120317:114454+091107) (Coord: 11:44:53.81 +09:11:07.3; J2000.0) was discovered at r=19.48 on Feb 2.5 UT offset by 2.75" from the SDSS galaxy J114453.98+091106.2 (r=21.51). A spectrum was obtained on Mar 14 at the Isaac Newton Telescope with the IDS (range 400-900nm), which shows it to be a normal type Ia SN, approx 10 days after peak at z=0.101. The SN is 4.7kpc offset from the likely dwarf galaxy host which has M_g=-16.4. PS1-12pd (=CSS120221:112052+513230 ; Drake et al. ATel #3941) (Coord: 11:20:52.43 +51:32:30.3; J2000.0) was found at g=18.87 on Feb 22.5 UT, coincident with the faint SDSS galaxy J112052.42+513230.6 (g=21.87) . A spectrum obtained on Mar 14 at the Isaac Newton Telescope with the IDS (range 360-1000nm) shows it to be a normal type Ia SN, which best fits SN 2003du (Anupama, G. C. et al 2005, A&A, 429, 667) and SN 2003cg (Elias-Rosa, N. et al 2006, MNRAS, 369, 1880) at epochs of 12-19d. Fitting with SNID yielded a redshift of 0.08 supported by the SDSS photometric redshift of the host galaxy (z=0.86 +/- 0.05). There is a Na I D line at the rest wavelength of the Milky Way observed, with an equivalent width of 3.3 Angstroms. There is no Na I D line observed at the rest wavelength of the supernova. The host is a M_g=-15.8 dwarf galaxy. PS1-12ql (Coord: 15:36:58.16 +03:59:49.4; J2000.0) was discovered on Feb 27.6 UT at z=17.98 offset by 0.57" from the SDSS galaxy J153657.75+035950.7 (z=17.25). A spectrum from the Isaac Newton Telescope with the IDS (range 400-900nm) on Mar 14 shows it to be a normal type Ia SN at approx 20 days after peak with a redshift z=0.04. The host has a SDSS spectroscopically confirmed redshift of 0.039 +/- 0.002 and is a M_g=-18.18 galaxy. PS1-12qh (Coords: 11:42:56.40 +04:21:47.4, J2000.0) was discovered at z=19.19 on Feb 3.7 UT offset from the SDSS galaxy J114256.39+042147.4 (z=19.53). A spectrum from the Isaac Newton Telescope with the IDS (range 400-900nm) on Mar 14 shows a blue continuum with a strong emission line at 468.7nm, this is likely MgII 280nm at a redshift of z=0.67. The SDSS colours are also suggestive of a QSO. This discovery was enabled using the PS1 System operated by the PS1 Science Consortium (PS1SC) and its member institutions, http://ps1sc.org/PS1_System_ATel.shtml. We would like to thank the PS1 telescope operators for their support of PS1 observations.
optical,agn,supernovae,transient