Pre-discovery photometry of kait-18P = SN 2018aoq in NGC 4151

ATel #11498; S. V. Nazarov, D. N. Okhmat (CrAO), K. V. Sokolovsky (ASC Lebedev/SAI MSU), D. V. Denisenko (SAI MSU)
on 3 Apr 2018; 17:27 UT
Credential Certification: Kirill Sokolovsky (kirx@scan.sai.msu.ru)

Tweet

The optical transient kait-18P = 2018aoq was discovered on 2018-04-01.4316 by Lick Observatory Supernova Search at the unfiltered magnitude of 15.3 1'13" from the center of NGC 4151 (z=0.00332, 17 Mpc NED). Spectroscopic observations with the 1.5m Kanata telescope classified the transient as a Type II supernova.

We identified the supernova on images obtained 0.47 days prior to discovery with the 0.7m AZT-8 telescope of the Crimean Astrophysical Observatory (CrAO) in the framework of the ongoing AGN monitoring program. The aperture photometry of the supernova relative to the nearby star UCAC4 647-049444 (assuming B=15.077, V=14.411, R=14.075, I=14.179 transformed from APASS following Jester et al. 2005, AJ, 130, 873) resulted in the following magnitudes (not corrected for the host galaxy light and Galactic reddening):

 
# Mid.Obs.JD    Mid.Obs.UT   Filter Mag.  Err.  Exp.  
2458209.4617 2018-03-31.9617   B    15.45 0.04 5x36sec  
2458209.4622 2018-03-31.9622   V    15.68 0.07 5x24sec  
2458209.4626 2018-03-31.9626   R    15.57 0.11 5x18sec  
2458209.4633 2018-03-31.9633   I    15.68 0.07 5x24sec  

The images of SN 2018aoq obtained with AZT-8 on 2018-03-31 are available atSN2018aoq/"> http://scan.sai.msu.ru/~kirx/ATel/SN2018aoq/

SN 2018aoq at the Transient Name Server