TITLE:   GCN CIRCULAR
NUMBER:  18372
SUBJECT: LIGO/Virgo G184098: spectral classification of PS15cci
DATE:    15/09/27 19:46:24 GMT
FROM:    S. J. Smartt at Queens U Belfast  <s.smartt@qub.ac.uk>

S.J. Smartt (Queen’s University Belfast), T. Kupfer (Caltech), K. Chambers
(IfA, University of Hawaii), K. W. Smith,  (QUB), M. Huber, E. Magnier,
H. Flewelling, C. Waters, J. Tonry, A. Schultz, N. Primak (IfA), D. Young,
D. Wright, (QUB), C. Stubbs (Harvard)

Further to GCN 18362, and the Pan-STARRS wide-field search of the
accessible area of the northern ALIGO/VIRGO area. We report
a spectrum of the transient PS15cci. Thomas Kupfer took a
25min exposure with the Palomar 200-inch and DBSP on 2015-09-25
covering 3200-9000 Angs.

This transient is in the faint dwarf galaxy
SDSS J091322.78+061047.6,  and clear emission lines from the host
([OII] 3727, [OIII] 5009, H-alpha) are detected at z=0.055 (
giving M_r ~ -17 for the host),

The transient is a type Ia supernova with SNID suggesting
a good match with a 1991T-like SN at an epoch of a few days before peak
brightness.

PS15cci lies within the 90% contour of the LIB area, and to date has been
the only candidate within this contour (in the northern probability region).
Pan-STARRS continues to observe the accessible north-western
spur of the ALIGO/VIRGO LIB region (nightly when weather allows),
pushing eastwards as far as possible.