POSSIBLE NOVA IN M31 – XM41MZ

Mi Zhang and Xing Gao, report the discovery of a possible nova (mag approximately 16.9) on several 300-s survey image (limiting mag about 19.5) taken by Xing Gao at Xingming Observatory #3 (N88) around Oct. 22.55024 UTC using a unfiltered CCD (+ 0.6-m f/8 Ritchey-Chretien telescope). The transient approximately located at R.A.=00h42m37.33s +41d20’51”.9 (equinox 2000.0). Which is about 78.8″ west and 283.4″ north of the center of the NGC224(M31). Nothing is visible at this position on archival images taken on Oct. 21.55558 (limiting mag 20.5) . Images can be found at: http://xjltp.china-vo.org/xm41mz.html

Discovery image taken by N88 on Oct. 22.55024 UTC,2020 Archival image taken by N88 on Oct. 21.55558 UTC,2020 PS Image
AT2020xyv (= XM41MZ) (= PNV J00423733+4120519)
JDHEL                   Gmag.
2459139.188       20.33
2459141.261       20.25
2459143.134       20.30
2459145.055       16.65
2459145.059       16.65
2459146.195       17.76
2459146.206       17.73
2459148.111       18.72
2459148.115       18.72
2459149.081       19.17
2459149.085       19.05
2459150.119       19.37
2459150.122       19.45
2459151.144       20.15
JDHEL                   Vmag.
2459144.169       18.99
2459144.202       18.94
2459145.085       16.79
2459145.086       16.71
2459145.087       16.71
2459145.157       16.86
2459145.161       16.86
2459145.166       16.87
2459145.17         16.85
2459145.174       16.83
2459145.178       16.88
2459145.182       16.88
2459145.186       16.91
2459145.19         16.90
2459145.194       16.90
2459145.198       16.90
2459145.208       16.95
2459145.212       16.96
2459145.216       16.85
2459145.22         16.93
2459145.224       16.97
2459145.228       17.02
2459145.232       17.08
2459145.236       17.01
2459145.241       17.07
2459145.245       17.03
2459145.249       17.09
2459145.253       17.02
2459145.257       17.08
2459145.261       17.06
2459145.265       17.06
2459145.269       17.12
2459145.273       17.06
2459145.277       17.06
2459145.282       17.11
2459145.286       17.08
2459145.29         17.09
2459145.294       17.09
2459145.298       17.11
2459145.302       17.17
2459145.306       17.12
2459145.31         17.09
2459145.314       17.12
2459145.318       17.12
2459145.323       17.16
2459145.327       17.11
2459145.331       17.13
2459145.335       17.10
2459145.339       17.09
2459145.343       17.16
2459145.347       17.20
2459145.351       17.19
2459145.355       17.18
2459145.359       17.21
2459145.363       17.23
2459145.367       17.23
2459145.371       17.20
2459145.375       17.28
2459145.379       17.31
2459145.383       17.26
2459145.387       17.30
2459145.391       17.30
2459145.395       17.29
2459145.399       17.25
2459145.403       17.31
2459145.407       17.37
2459145.411       17.35
2459145.415       17.29
2459145.419       17.34
2459145.423       17.31
2459145.427       17.38
2459145.431       17.29
2459145.435       17.30
2459145.439       17.31
2459145.443       17.35
2459145.447       17.33
JDHEL                   Rmag.
2459144.166       18.82
2459144.171       18.94
2459144.199       18.53
2459145.089       16.34
2459145.09         16.32
2459145.091       16.32
2459145.159       16.42
2459145.163       16.37
2459145.167       16.36
2459145.171       16.39
2459145.175       16.37
2459145.179       16.41
2459145.183       16.43
2459145.188       16.42
2459145.192       16.41
2459145.196       16.39
2459145.2           16.42
2459145.209       16.42
2459145.213       16.46
2459145.217       16.43
2459145.222       16.44
2459145.226       16.45
2459145.23         16.45
2459145.234       16.46
2459145.238       16.47
2459145.242       16.48
2459145.246       16.49
2459145.25         16.46
2459145.254       16.52
2459145.258       16.51
2459145.262       16.53
2459145.266       16.46
2459145.271       16.50
2459145.275       16.52
2459145.279       16.53
2459145.283       16.56
2459145.287       16.53
2459145.291       16.57
2459145.295       16.56
2459145.299       16.52
2459145.303       16.57
2459145.308       16.56
2459145.312       16.52
2459145.316       16.56
2459145.32         16.54
2459145.324       16.55
2459145.328       16.54
2459145.332       16.56
2459145.336       16.58
2459145.34         16.56
2459145.344       16.61
2459145.348       16.59
2459145.352       16.62
2459145.356       16.61
2459145.36         16.67
2459145.364       16.61
2459145.368       16.62
2459145.372       16.65
2459145.376       16.72
2459145.38         16.68
2459145.384       16.67
2459145.388       16.68
2459145.393       16.69
2459145.397       16.63
2459145.401       16.70
2459145.405       16.68
2459145.409       16.69
2459145.413       16.71
2459145.417       16.72
2459145.421       16.69
2459145.425       16.69
2459145.429       16.73
2459145.433       16.74
2459145.437       16.73
2459145.441       16.74
2459145.445       16.71
2459150.321       18.93
2459150.329       18.50
JDHEL                   Imag.
2459145.093       15.99
2459145.094       16.00
2459145.095       16.01
2459145.16         16.02
2459145.164       16.00
2459145.168       15.99
2459145.172       16.00
2459145.176       15.99
2459145.181       16.03
2459145.185       16.01
2459145.189       16.02
2459145.193       16.01
2459145.197       16.03
2459145.201       16.05
2459145.211       16.02
2459145.215       16.03
2459145.219       16.03
2459145.223       16.03
2459145.227       16.05
2459145.231       16.05
2459145.235       16.07
2459145.239       16.03
2459145.243       16.06
2459145.247       16.12
2459145.251       16.10
2459145.255       16.10
2459145.26         16.01
2459145.264       16.10
2459145.268       16.08
2459145.272       16.08
2459145.276       16.04
2459145.28         16.15
2459145.284       16.18
2459145.288       16.08
2459145.292       16.07
2459145.297       16.11
2459145.301       16.12
2459145.305       16.11
2459145.309       16.06
2459145.313       16.12
2459145.317       16.08
2459145.321       16.08
2459145.325       16.06
2459145.329       16.11
2459145.333       16.08
2459145.338       16.06
2459145.342       16.12
2459145.346       16.10
2459145.35         16.17
2459145.354       16.14
2459145.358       16.17
2459145.362       16.14
2459145.366       16.17
2459145.37         16.24
2459145.374       16.17
2459145.378       16.23
2459145.382       16.15
2459145.386       16.19
2459145.39         16.14
2459145.394       16.25
2459145.398       16.25
2459145.402       16.22
2459145.406       16.22
2459145.41         16.29
2459145.414       16.28
2459145.418       16.21
2459145.422       16.28
2459145.426       16.26
2459145.43         16.26
2459145.434       16.29
2459145.438       16.26
2459145.442       16.25
2459145.446       16.25

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