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Table A.1.

Photometry of ASASSN-20jq

UT Date JD − Phasea B V g r i z Telescopeb
2,459,000 (days) (mag) (mag) (mag) (mag) (mag) (mag) / Inst.
2020-08-04.14 65.64 −20.1 — — > 16.90 — — — ASAS-SN
2020-08-04.29 65.79 −19.9 — — — > 18.46c — — ATLAS-O
2020-08-05.25 66.75 −19.0 — — — — — 17.41 ± 0.030d PanSTARRS
2020-08-08.13 69.63 −16.1 — — 16.800 ± 0.500 — — — ASAS-SN
2020-08-09.16 70.66 −15.1 17.336 ± 0.055 — 17.073 ± 0.040 16.533 ± 0.016 16.539 ± 0.040 — PO-NM
2020-08-09.89 71.39 −14.3 17.173 ± 0.077 16.602 ± 0.040 16.944 ± 0.038 16.497 ± 0.027 — — Asiago-0m9
2020-08-11.13 72.63 −13.1 16.708 ± 0.046 — 16.483 ± 0.051 16.081 ± 0.039 16.146 ± 0.046 — PO-NM
2020-08-12.13 73.63 −12.1 16.444 ± 0.051 — 16.153 ± 0.038 15.683 ± 0.028 15.908 ± 0.045 — PO-NM
2020-08-13.13 74.63 −11.1 16.236 ± 0.034 — 15.966 ± 0.068 15.477 ± 0.029 15.528 ± 0.040 — PO-NM
2020-08-17.13 78.63 −7.1 15.299 ± 0.037 — 15.137 ± 0.054 14.676 ± 0.021 14.936 ± 0.035 — PO-NM
2020-08-19.15 80.65 −5.1 15.080 ± 0.069 — 14.823 ± 0.037 14.485 ± 0.018 14.700 ± 0.031 — PO-NM
2020-08-23.13 84.63 −1.2 14.755 ± 0.062 — 14.617 ± 0.071 14.244 ± 0.040 14.482 ± 0.034 — PO-NM
2020-08-23.86 85.36 −0.4 — 14.204 ± 0.027 14.482 ± 0.032 14.154 ± 0.017 — — Asiago-0m9
2020-08-26.13 87.63 1.8 — — 14.544 ± 0.068 — 14.524 ± 0.049 — PO-NM
2020-08-27.14 88.64 2.8 14.857 ± 0.048 — — — — — PO-NM
2020-08-28.14 89.64 3.8 14.865 ± 0.036 — 14.565 ± 0.054 — — — PO-NM
2020-09-02.82 95.32 9.5 — — — — 14.656 ± 0.064 — Asiago-0m9
2020-09-03.80 96.30 10.5 15.591 ± 0.081 14.536 ± 0.029 15.003 ± 0.036 14.401 ± 0.021 14.647 ± 0.016 — Asiago-0m9
2020-09-11.78 104.28 18.4 — 15.063 ± 0.043 15.832 ± 0.043 14.768 ± 0.057 14.711 ± 0.025 — Asiago-0m9
2020-09-12.78 105.28 19.4 16.542 ± 0.067 15.164 ± 0.037 15.921 ± 0.040 14.805 ± 0.021 14.753 ± 0.023 — Asiago-0m9
2020-09-15.78 108.28 22.4 16.782 ± 0.072 15.341 ± 0.032 16.151 ± 0.036 14.974 ± 0.020 14.834 ± 0.019 — Asiago-0m9
2020-09-17.79 110.29 24.4 16.925 ± 0.072 15.470 ± 0.030 16.274 ± 0.035 15.071 ± 0.027 — — Asiago-0m9
2020-09-18.79 111.29 25.4 — — — — 14.960 ± 0.020 — Asiago-0m9
2020-09-21.77 114.27 28.4 — 15.748 ± 0.035 16.551 ± 0.049 15.360 ± 0.023 15.166 ± 0.028 — Asiago-0m9
2020-10-22.16 144.66 58.7 — 16.592 ± 0.037 — — — — Asiago-0m9
2020-10-31.15 153.65 67.6 — — 17.416 ± 0.069 — — — Asiago-0m9
2020-11-01.16 154.66 68.6 — — — 16.781 ± 0.039 16.672 ± 0.035 — Asiago-0m9
2020-11-07.15 160.65 74.6 — 16.996 ± 0.045 17.514 ± 0.048 16.956 ± 0.034 16.795 ± 0.035 — Asiago-0m9
2020-11-09.49 162.99 76.9 17.896 ± 0.050 — 17.570 ± 0.065 16.942 ± 0.019 16.909 ± 0.035 — PO-NM
2020-11-10.49 163.99 77.9 17.704 ± 0.048 — 17.379 ± 0.058 16.837 ± 0.042 16.878 ± 0.050 — PO-NM
2020-11-15.14 168.64 82.5 — 17.166 ± 0.037 17.637 ± 0.050 17.214 ± 0.030 17.082 ± 0.034 — Asiago-0m9
2020-11-21.49 174.99 88.9 18.045 ± 0.046 — 17.595 ± 0.047 17.335 ± 0.023 17.242 ± 0.037 — PO-NM
2020-11-22.17 175.67 89.5 — 17.335 ± 0.034 17.711 ± 0.045 17.428 ± 0.036 17.284 ± 0.036 — Asiago-0m9
2020-11-22.49 175.99 89.9 18.024 ± 0.041 — 17.661 ± 0.048 17.397 ± 0.020 17.249 ± 0.043 — PO-NM
2020-11-22.52 176.02 89.9 — — 17.741 ± 0.114 17.426 ± 0.078 — — ZTF
2020-11-25.51 179.01 92.9 — — 17.746 ± 0.046 — — — ZTF
2020-11-27.49 180.99 94.8 18.240 ± 0.042 — 17.739 ± 0.045 17.510 ± 0.019 17.384 ± 0.040 — PO-NM
2020-11-27.52 181.02 94.9 — — 17.831 ± 0.098 17.587 ± 0.063 — — ZTF
2020-11-30.14 183.64 97.5 — 17.515 ± 0.045 17.833 ± 0.052 17.746 ± 0.046 17.526 ± 0.040 — Asiago-0m9
2020-11-30.51 184.01 97.9 18.331 ± 0.067 — — — — — PO-NM
2020-12-01.51 185.01 98.9 — — — 17.680 ± 0.053 — — ZTF
2020-12-04.45 187.95 101.8 18.603 ± 0.080 — 18.032 ± 0.062 17.705 ± 0.032 17.298 ± 0.059 — PO-NM
2020-12-05.53 189.03 102.9 — — 17.914 ± 0.060 17.738 ± 0.063 — — ZTF
2020-12-07.41 190.91 104.7 — — 17.715 ± 0.047 17.574 ± 0.029 17.470 ± 0.043 — PO-NM
2020-12-10.50 194.00 107.8 — — 17.950 ± 0.078 17.931 ± 0.066 — — ZTF
2020-12-12.53 196.03 109.8 — — 18.080 ± 0.080 17.957 ± 0.071 — — ZTF
2020-12-14.17 197.67 111.5 — 17.861 ± 0.042 — — 17.748 ± 0.034 — Asiago-0m9
2020-12-15.52 199.02 112.8 — — 18.111 ± 0.066 18.115 ± 0.064 — — ZTF
2020-12-16.44 199.94 113.7 18.458 ± 0.049 — 18.162 ± 0.045 18.152 ± 0.027 17.807 ± 0.044 — PO-NM
2020-12-17.44 200.94 114.7 18.680 ± 0.046 — 18.034 ± 0.047 18.144 ± 0.026 17.847 ± 0.044 — PO-NM
2020-12-19.44 202.94 116.7 18.622 ± 0.051 — 18.246 ± 0.043 18.275 ± 0.026 17.851 ± 0.044 — PO-NM
2020-12-19.53 203.03 116.8 — — 18.187 ± 0.069 18.263 ± 0.059 — — ZTF
2020-12-21.49 204.99 118.8 — — 18.247 ± 0.072 18.314 ± 0.095 — — ZTF
2020-12-23.15 206.65 120.4 — 18.140 ± 0.043 — — 17.948 ± 0.059 — Asiago-0m9
2020-12-26.49 209.99 123.7 18.738 ± 0.047 — 18.368 ± 0.050 18.562 ± 0.043 18.146 ± 0.049 — PO-NM
2020-12-27.49 210.99 124.7 18.960 ± 0.064 — 18.502 ± 0.044 18.429 ± 0.036 18.164 ± 0.049 — PO-NM
2021-01-01.51 216.01 129.7 — — 18.526 ± 0.119 18.644 ± 0.131 — — ZTF
2021-01-02.49 216.99 130.7 18.859 ± 0.080 — 18.566 ± 0.052 18.802 ± 0.048 18.305 ± 0.058 — PO-NM
2021-01-03.46 217.96 131.7 — — 18.658 ± 0.125 18.669 ± 0.097 — — ZTF
2021-01-05.46 219.96 133.7 — — 18.556 ± 0.106 18.866 ± 0.105 — — ZTF
2021-01-06.49 220.99 134.7 18.750 ± 0.057 — 18.683 ± 0.053 18.613 ± 0.044 18.126 ± 0.052 — PO-NM
2021-01-07.47 221.97 135.7 — — 18.602 ± 0.086 18.911 ± 0.134 — — ZTF
2021-01-09.51 224.01 137.7 — — 18.764 ± 0.082 18.957 ± 0.106 — — ZTF
2021-01-11.50 226.00 139.7 — — 18.862 ± 0.159 18.817 ± 0.352 — — ZTF
2021-01-13.16 227.66 141.4 — 18.642 ± 0.041 — — 18.417 ± 0.043 — Asiago-0m9
2021-01-13.43 227.93 141.6 — — 18.797 ± 0.093 19.022 ± 0.128 — — ZTF
2021-01-13.49 227.99 141.7 19.067 ± 0.052 — 18.853 ± 0.048 18.806 ± 0.051 18.587 ± 0.054 — PO-NM
2021-01-15.49 229.99 143.7 — — 18.859 ± 0.180 19.003 ± 0.219 18.509 ± 0.102 — PO-NM,ZTF
2021-01-16.49 230.99 144.7 19.548 ± 0.166 — 18.902 ± 0.051 19.097 ± 0.053 18.466 ± 0.060 — PO-NM
2021-01-17.46 231.96 145.6 — — 18.863 ± 0.105 19.200 ± 0.090 — — ZTF
2021-01-17.49 231.99 145.7 19.350 ± 0.129 — 18.904 ± 0.048 19.087 ± 0.044 18.554 ± 0.051 — PO-NM
2021-01-18.48 232.98 146.7 19.275 ± 0.059 — 18.852 ± 0.058 — 18.600 ± 0.051 — PO-NM
2021-01-22.49 236.99 150.6 19.350 ± 0.076 — 18.957 ± 0.048 19.223 ± 0.057 18.343 ± 0.066 — PO-NM
2021-01-24.48 238.98 152.6 19.286 ± 0.075 — 19.098 ± 0.046 19.325 ± 0.061 18.716 ± 0.048 — PO-NM
2021-01-27.43 241.93 155.6 19.057 ± 0.099 — 19.117 ± 0.070 19.355 ± 0.087 18.767 ± 0.063 — PO-NM
2021-02-03.44 248.94 162.6 — — — 19.459 ± 0.173 — — ZTF
2021-02-05.43 250.93 164.5 19.864 ± 0.039 — 19.253 ± 0.029 19.739 ± 0.071 19.259 ± 0.046 — PO-NM
2021-02-05.44 250.94 164.5 — — 19.219 ± 0.112 19.536 ± 0.137 — — ZTF
2021-02-06.43 251.93 165.5 20.406 ± 0.062 — — — — — PO-NM
2021-02-07.41 252.91 166.5 — — 19.210 ± 0.096 19.533 ± 0.107 — — ZTF
2021-02-08.43 253.93 167.5 20.378 ± 0.044 — 19.623 ± 0.038 20.021 ± 0.041 19.429 ± 0.041 — PO-NM
2021-02-09.43 254.93 168.5 — — 19.205 ± 0.160 19.721 ± 0.131 — — ZTF
2021-02-10.43 255.93 169.5 20.134 ± 0.051 — 19.399 ± 0.031 — 19.428 ± 0.068 — PO-NM
2021-02-11.43 256.93 170.5 20.186 ± 0.044 — 19.370 ± 0.032 19.735 ± 0.146 19.218 ± 0.061 — PO-NM,ZTF
2021-02-12.43 257.93 171.5 20.523 ± 0.059 — — — 19.343 ± 0.050 — PO-NM
2021-02-13.37 258.87 172.4 — — 19.242 ± 0.145 19.857 ± 0.179 — — ZTF
2021-02-17.44 262.94 176.5 — — 19.435 ± 0.144 19.823 ± 0.159 — — ZTF
2021-02-19.46 264.96 178.5 — — 19.430 ± 0.125 20.035 ± 0.176 — — ZTF
2021-02-20.43 265.93 179.5 20.599 ± 0.043 — — — 19.433 ± 0.044 — PO-NM
2021-02-21.42 266.92 180.5 20.523 ± 0.042 — 19.843 ± 0.032 — — — PO-NM
2021-02-22.39 267.89 181.4 — — 19.686 ± 0.040 — 19.097 ± 0.055 19.213 ± 0.153 LCOGT-2m
2021-02-22.43 267.93 181.5 20.730 ± 0.067 — — — 19.695 ± 0.063 — PO-NM
2021-02-23.43 268.93 182.5 — — 19.493 ± 0.145 19.965 ± 0.222 — — ZTF
2021-02-23.43 268.93 182.5 — — 19.490 ± 0.034 — 19.373 ± 0.050 — PO-NM
2021-02-25.40 270.90 184.4 — — 19.471 ± 0.204 — — — ZTF
2021-02-27.43 272.93 186.5 — — 19.670 ± 0.324 — — — ZTF
2021-03-03.27 276.77 190.3 — — 19.771 ± 0.258 — — — ZTF
2021-03-05.43 278.93 192.4 20.733 ± 0.078 — — 20.585 ± 0.065 19.650 ± 0.254 — PO-NM
2021-03-07.32 280.82 194.3 — — 19.756 ± 0.162 20.111 ± 0.183 — — ZTF
2021-03-10.43 283.93 197.4 20.753 ± 0.060 — 19.926 ± 0.043 — 19.344 ± 0.075 — PO-NM
2021-03-17.41 290.91 204.4 — — 19.822 ± 0.121 — — — ZTF
2021-03-19.34 292.84 206.3 — — 19.806 ± 0.198 20.602 ± 0.248 — — ZTF
2021-03-21.35 294.85 208.3 20.957 ± 0.098 — — 21.024 ± 0.078 19.666 ± 0.050 — PO-NM
2021-03-24.31 297.81 211.2 — — 19.891 ± 0.305 — — — ZTF
2021-03-27.35 300.85 214.3 20.671 ± 0.220 — 19.972 ± 0.119 21.218 ± 0.212 19.860 ± 0.111 — PO-NM
2021-03-31.31 304.81 218.2 21.017 ± 0.211 — 19.717 ± 0.224 20.741 ± 0.201 19.908 ± 0.081 — PO-NM,ZTF
2021-04-03.28 307.78 221.2 — — 20.019 ± 0.185 20.791 ± 0.318 — — ZTF
2021-04-05.30 309.80 223.2 — — 20.319 ± 0.226 — — — ZTF
2021-04-07.31 311.81 225.2 21.326 ± 0.093 — 20.410 ± 0.066 21.347 ± 0.160 20.277 ± 0.175 — PO-NM
2021-04-08.31 312.81 226.2 20.937 ± 0.076 — 20.489 ± 0.069 — 20.231 ± 0.174 — PO-NM
2021-04-09.26 313.76 227.1 — — 20.211 ± 0.213 — — — ZTF
2021-04-09.31 313.81 227.2 21.151 ± 0.128 — 20.492 ± 0.068 — 20.279 ± 0.161 — PO-NM
2021-04-10.31 314.81 228.2 20.954 ± 0.084 — 20.353 ± 0.060 — 19.857 ± 0.104 — PO-NM
2021-04-13.29 317.79 231.1 21.124 ± 0.087 — 20.331 ± 0.141 — 20.087 ± 0.132 — PO-NM,ZTF
2021-04-17.37 321.87 235.2 — — 20.248 ± 0.210 — — — ZTF
2021-04-19.31 323.81 237.1 — — 20.244 ± 0.217 — — — ZTF
2021-04-20.26 324.76 238.1 — — 20.837 ± 0.095 21.217 ± 0.190 — — PO-NM
2021-04-22.29 326.79 240.1 — — — — 19.930 ± 0.119 — PO-NM
2021-04-23.28 327.78 241.1 — — — 21.038 ± 0.145 — — PO-NM
2021-04-24.26 328.76 242.1 — — 20.607 ± 0.076 21.257 ± 0.073 20.182 ± 0.038 — PO-NM-0m8
2021-04-25.27 329.77 243.1 — — 20.467 ± 0.068 21.151 ± 0.087 19.763 ± 0.096 — PO-NM,PO-NM-0m8
2021-05-01.25 335.75 249.0 — — 20.689 ± 0.077 — — — PO-NM
2021-05-01.28 335.78 249.1 — — 20.476 ± 0.260 — — — ZTF
2021-05-03.24 337.74 251.0 — — — 21.736 ± 0.100 20.441 ± 0.203 — PO-NM
2021-05-04.32 338.82 252.1 — — 20.684 ± 0.272 — — — ZTF
2021-05-05.23 339.73 253.0 — — — 22.401 ± 0.166 20.289 ± 0.037 — PO-NM
2021-05-08.32 342.82 256.1 — — 20.386 ± 0.277 — — — ZTF
2021-05-10.30 344.80 258.1 — — 20.606 ± 0.197 — — — ZTF
2021-05-13.23 347.73 261.0 — — — — 20.242 ± 0.147 — PO-NM
2021-05-30.19 364.69 277.9 — — — — 20.266 ± 0.142 — PO-NM
2021-06-09.27 374.77 287.9 — — 21.305 ± 0.136 22.626 ± 0.574 20.432 ± 0.164 23.000 ± 1.000 LCOGT-2m
2021-06-21.38 386.88 300.0 — — 21.635 ± 0.187 23.221 ± 1.016 20.613 ± 0.195 — LCOGT-2m
2021-07-02.36 397.86 310.9 — — 21.989 ± 0.250 — 20.683 ± 0.209 — LCOGT-2m
2021-07-05.34 400.84 313.9 — — 21.542 ± 0.165 — 20.863 ± 0.243 — LCOGT-2m
2021-07-08.34 403.84 316.9 — — 21.759 ± 0.205 — 20.790 ± 0.227 — LCOGT-2m
2021-07-30.25 425.75 338.7 — — 21.901 ± 0.233 — 20.875 ± 0.246 — LCOGT-2m

Notes. (a)Rest-frame days relative to the epoch of B-band maximum, i.e., JD 2,459,085.8. (b) The abbreviations for the telescope/instrument are: ASASSN - ASAS-SN quadruple 14cm telescopes; ATLAS-O - ATLAS survey telescope’s orange filter observation; PanSTARRS - Pan-STARRS survey telescopes; ZTF - ZTF survey telescopes; Asiago-0m9 - 0.9 m Schmidt telescope at Asiago; PO-NM - Post Observatory 0.6 m telescope; PO-NM-0m8 - Post Observatory 0.8 m telescope; LCOGT-2m - Las Cumbres Observatory 2 m telescope network. Data observed within 5 hr are represented under a single-epoch observation. (c) The reported magnitude is in ATLAS-Orange filter. (d) This z-band photometry is in the PanSTARRS filter system.

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