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KAIT Prediscovery Detection of PS1-14xz in NGC 4258 (Messier 106)

ATel #6159; WeiKang Zheng and Alexei V. Filippenko (UC Berkeley)
on 21 May 2014; 21:07 UT
Credential Certification: Weikang Zheng (zwk@umich.edu)

Subjects: Optical, Supernovae

Referred to by ATel #: 6270, 6273

The probable supernova discovered by Pan-STARRS1 (ATel #6156) in NGC 4258 (M106) was observed with the 0.76-m Katzman Automatic Imaging Telescope (KAIT) as part of the Lick Observatory Supernova Search, with an average cadence of 3 days. The object was detected in KAIT unfiltered (roughly R) images obtained on Apr. 09.35, Apr 12.35, Apr. 14.35 UT and thereafter, but there was no detection in KAIT images obtained on Apr 06.35 with a limiting mag of about 18.0. Preliminary analysis shows that the target had a rising light curve since the detection on Apr. 09, with an increase of about 2 mag in the first two weeks. The brightness thereafter is roughly constant at 15 mag. Owing to the high background and the very small projected distance from the host nucleus, it is difficult to make a precise measurement of the brightness, but the light curve is consistent with that of a Type II-P supernova. The object was not detected by our pipeline because there are very few field stars and the nuclear region of the host galaxy is complex.