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Five transients in the Pan-STARRS1 Faint Galaxy Supernova Survey

ATel #3351; S. J. Smartt, S. Valenti, L. Magill, K. Smith, E. Kankare, S. Mattila, R. Kotak, M. Fraser (Queen's University Belfast); M. Ward, S. Hutton, N. Metcalfe (Durham University);, F. Bresolin, R. Kudritzki, J. Tonry, E. Magnier, K. Chambers, N. Kaiser, J. Morgan, W. Burgett, J. Heasley, W. Sweeney, C. Waters, H. Flewelling (Institute for Astronomy, University of Hawaii); P. A. Price (Princeton), M. W. Wood-Vasey (Univ. of Pittsburgh).
on 15 May 2011; 19:45 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Stephen Smartt (s.smartt@qub.ac.uk)

Subjects: Optical

Referred to by ATel #: 3354, 3918, 3925, 3980, 4108, 4231, 4516, 4665, 5330

We report observations of five transients during the course of the PS1 3Pi sky survey. The "3Pi Faint Galaxy Supernova Survey" independently discovered the two blue optical transients reported by CRTS and PTF in ATels #3343, #3344. CSS 110406:135058+261642 (=PTF11dij = PS1-11xk) was found at g=17.96, r=18.17, i=18.42 on April 15.1 (UT).

CSS110208:135717-093238 (=PS1-11xl) was found at i=17.12 on April 15.0 and g=16.98 on April 30.8 UT. Images from PS1 were taken on 13 epochs before the earliest CRTS discovery point. The source displayed short timescale variability. Two r-band images on 2010 Apr 12, separated by 13mins show a detection limit r>21.5 and a detection at r=20.9. This supports the variability reported from CRTS and together with the point source nature implies a galactic source.

PS1-11xm (Coord: 13:43:05.64 +52:08:43.0) was discovered at i=19.1 on Apr 19, coincident with SDSS J134305.64+520842.9 (i=20.49). A spectrum was obtained on May 8 at the Nordic Optical Telescope (+ALFOSC+Gr4; range 350-910nm), showing a blue continuum with narrow Balmer lines (FWHM ~ 1200 km/s) at a redshift of 0.35 (and very weak [OIII] 5007). The spectrum is almost identical to that reported for another PS1 nuclear transient (Valenti et al. ATel #2838), and is similar to both narrow-line Seyferts and also SN1994W (Chugai et al. 2004, MNRAS, 352, 1213; Dessart et al. 2009, MNRAS, 394, 21) and SN2008AM (Chatzopoulos et al. 2011ApJ, 729, 143). PS1-11xm is also similar to CSS100217:102913+404220 (Drake et al. arXiv:1103.5514). The AGN or luminous SN nature of these events is still unclear and remains to be unveiled with further multi-wavelength coverage.

PS1-11xn (Coord: 14:47:39.58 +51:41:04.70) was discovered at r=18.55 on Apr 26, coincident with the faint galaxy SDSS J144739.53+514105.1 (r=21.24). A spectrum at the Isaac Newton Telescope on May 10 with the IDS (range 450-900nm) shows a blue continuum with H-alpha and H-beta in emission z=0.04, most likely a type IIn SN in a M_g = -14 dwarf galaxy.

PS1-11xo (Coord: 13:47:40.73 +59:01:07.2) was discovered at r=18.92 on Apr 14, 1" offset from the faint galaxy SDSS J134740.71+590106.2 1 (r=21.12). A spectrum at the Isaac Newton Telescope on May 10 with the IDS (range 450-900nm) shows it to be a normal type Ia SN, approx 25 days after peak, in a M_g = -16 dwarf galaxy at z=0.072.

This discovery was enabled using the PS1 System operated by the PS1 Science Consortium (PS1SC) and its member institutions, http://www.ps1sc.org/PS1_System_ATel.htm . We would like to thank the PS1 telescope operators for their support of PS1 observations.

The PS1 Science Consortium