IAU Central Bureau for Astronomical Telegrams

Central Bureau for Astronomical Telegrams -- Image credits

CBAT "Transient Object Followup Reports"

TCP J00401150+4042199

TCP J00401150+4042199   2015 07 24.7798*  00 40 11.50 +40 42 19.9  18.6 U 1723W2029S  M31       N 0

2015 07 24.7798

Koichi Nishiyama, Kurume,Japan and Fujio Kabashima, Miyaki,Japan report the discovery of a possible nova? .(mag.= 18.6) in M31 on seven 40-s unfiltered CCD frames taken around 2015 Jul. 24.77976 UT, ( limiting magnitude = 19.6 ) using a 0.50-m f/6.8 reflector (+FLI 1001E camera). as follows We have checked in Minor Planets. Nothing is visible at the position of possible nova on the Digitized Sky Survey(POSS2/UKSTU) from 1989 Oct. 01 (limiting red mag 19.1) and 1993 Sep. 23(limiting infrared mag 18.9). the nearest star in M31 catalogue(http://www.lowell.edu/users/massey/lgsurvey.html) has position end figures 11s50, 18."6, distance 1."3, magnitudes V=22.2, B=23.8, R=21.0

2015 07 26

see ATel #7834

2015 07 26.46243

Mag.=17.8U, position end figures 11s.50, 19".6, on an image composed from 3-frames which were taken by each 180-seconds exposure under the limiting magnitude = 19.5, remotely using a 0.43-m f/6.8 astrograph + CCD(FLI-PL6303E) + f/4.5 focal reducer at the iTelescopeNET Mayhill, New Mexico, USA. Observer T. Yusa, Osaki, Japan. An Image was put at URL http://space.geocities.jp/yusastar77/supernova/PNinM31_150726.htm

2015 07 24.16229

Vladimir Lipunov and Rafael Rebolo Lopez reports the discovery of this optical transient (possible Nova or LBV-star) with unfiltered m=19.4 on 2015-07-24.16229UT, that was publishied in ATel #7834 on 2015-07-24.75486 (earlier then Koichi Nishiyama make an image of this OT on 24.7798*). MASTER-IAC (Teyde Observatory, Canarias) auto-detection system detected OT source at (RA, Dec) = 00h 40m 11.55s +40d 42m 19.4s on 2015-07-24.16229 UT. E.Popova and E.Gorbovskoy report that nothing was visible at this position on 2015-07-21.12653 UT with 20.0 unfiltered magnitude limit (0.2B+0.8R, USNOB1). The discovery images is available at http://master.sai.msu.ru/static/OT/M31_cnd.png .

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