Central Bureau for Astronomical Telegrams

CBAT "Transient Object Followup Reports"

TCP J00430048+4112366

TCP J00430048+4112366   2013 09 13.5841*  00 43 00.48 +41 12 36.6  17.7 U  182E 212S  M31       N 0

2013 09 13.5841

Koichi Nishiyama, Kurume,Japan and Fujio Kabashima, Miyaki,Japan report the discovery of a possible nova? .(mag.= 17.7) in M31 on seven 40-s unfiltered CCD frames taken around 2013 Sep. 13.58410 UT, ( limiting magnitude = 19.8 ) using a Meade 200R 0.40-m f/9.8 reflector (+SBIG STL1001E camera). as follows Nothing is visible at this location on our past frames taken on 2013 Sep. 09.525 UT (limiting magnitude = 19.1) and Sep 11654 UT (limiting magnitude = 18.9). . We have checked in Minor Planets. Nothing is visible at the position of possible nova on the Digitized Sky Survey(POSS2/UKSTU) from 1986 Nov. 27 (limiting red mag 18.9) and 1993 Oct. 21(limiting infrared mag 18.4). the nearest star in M31 catalogue (http://www.lowell.edu/users/massey/lgsurvey.html) has position end figures 00s55, 36."8, distance 0."8, magnitudes V=22.5, B=24.0, R=21.3

2013 09 13.843

This transient was observed on 2013 09 13.843 by Gianluca Masi, Francesca Nocentini and Patrick Schmeer, remotely using the 17" robotic unit part of the Virtual Telescope Project facility in Ceccano, Italy. Unfiltered images show a source at mag. 17.0 (R mags for the reference stars from UCAC-4). We also performed astrometry, getting the following end figures: 00.50s 36.3" (J2000.0, mean residuals of 0.15" on both axes). We observed the same field 24 hours earlier and nothing was visible at that position, down to mag. 19.5 or so.

2013 09 17.475

Mag.= 16.3, position end figures 00s.51, 36".5 observed by T. Noguchi, Chiba-ken, Japan, from four stacked 30-s frames (limit mag.= 17.5) using 0.23-m f/6.3 Schmidt-Cassegrain + unfiltered CCD (BITRAN BT-11E). Position and magnitude were measured using UCAC4. See a posted image at http://park8.wakwak.com/~ngc/images/TCPinM31_20130917.jpg.