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Prediscovery Detection and Photometry of PNV J00432496+4121219

ATel #5522; K. Hornoch (Astronomical Institute, Ondrejov, Czech Republic), A. Manilla-Robles (ING, La Palma and University of La Laguna, Tenerife, Spain), V. Tudor, O. Vaduvescu (ING, La Palma, Spain), G. Ramsay (Armagh Observatory, Northern Ireland)
on 27 Oct 2013; 20:43 UT
Credential Certification: Allen W. Shafter (aws@nova.sdsu.edu)

Subjects: Optical, Nova, Transient

Referred to by ATel #: 5543, 5569

On 2013 Oct. 22.1 UT an apparent nova in M31 (with magnitude R = 19.1) was discovered by the intermediate Palomar Transient Factory, and independently, on Oct. 23.30 UT, by the Lick Observatory Supernova Search (see ATel #5502 and references therein). The object was designated iPTF13dum = PNV J00432496+4121219.

Here, we report prediscovery detection of the object on co-added 800-s narrow-band H-alpha and 400-s Sloan r'-band CCD images of the central region of M31. The images were obtained with the 2.5-m Isaac Newton Telescope + WFC at La Palma on 2013 Oct. 20.851 - 20.865 UT and 21.887 - 21.906 UT under ~1.5" and ~1.3" seeing, respectively.

The following magnitudes were obtained from the co-added images:

   Date UT         H-alpha mag       Sloan r' mag 
2013-10-20.851    19.0  +/- 0.15 
2013-10-20.865                      19.9  +/- 0.15 
2013-10-21.887    18.78 +/- 0.07 
2013-10-21.906                      19.02 +/- 0.05 
This work is based on observations made with the Isaac Newton Telescope (INT) operated on the island of La Palma by the Isaac Newton Group (ING) in the Spanish Observatorio del Roque de los Muchachos of the Instituto de Astrofisica de Canarias (IAC).