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Table A.1.

Optical photometry of SN 2021hem.

UT Date JD − Phasea B V g r i c o Telescopeb
2,459,000 (days) (mag) (mag) (mag) (mag) (mag) (mag) (mag) / Inst.
2021-03-18.47 291.97 −23.6 — — > 20.538 > 20.140 — — — ZTF
2021-03-22.39 295.89 −19.8 — — > 19.600 > 20.120 — — — ZTF
2021-03-24.43 297.93 −17.9 — — 20.132 ± 0.244 19.920 ± 0.211 — — — ZTF
2021-03-27.50 301.00 −14.9 — — 19.966 ± 0.263 19.656 ± 0.237 — — 18.156 ± 0.780 ATLAS,ZTF
2021-03-28.42 301.92 −14.0 — — 18.968 ± 0.139 18.913 ± 0.132 — — — ZTF
2021-03-29.41 302.91 −13.1 — — 18.543 ± 0.092 18.434 ± 0.076 — — — ZTF
2021-03-30.46 303.96 −12.1 — — 18.080 ± 0.058 18.036 ± 0.056 — — 18.173 ± 0.079 ATLAS,ZTF
2021-03-31.43 304.93 −11.1 — — 17.724 ± 0.051 17.846 ± 0.053 — — — ZTF
2021-04-01.48 305.98 −10.1 — — 17.401 ± 0.029 — 17.680 ± 0.048 — 17.436 ± 0.024 ATLAS,ZTF
2021-04-02.45 306.95 −9.2 — — 17.059 ± 0.026 17.060 ± 0.032 — — — ZTF
2021-04-03.43 307.93 −8.2 — — 16.809 ± 0.025 16.924 ± 0.026 — — — ZTF
2021-04-04.40 308.90 −7.3 — — 16.733 ± 0.018 16.730 ± 0.029 17.137 ± 0.029 — — ZTF
2021-04-05.47 309.97 −6.3 — — 16.548 ± 0.021 16.664 ± 0.021 — — 16.776 ± 0.010 ATLAS,ZTF
2021-04-06.43 310.93 −5.3 — — 16.427 ± 0.022 16.505 ± 0.027 — — — ZTF
2021-04-06.49 310.99 −5.3 — — 16.483 ± 0.008 — — — — YSE
2021-04-07.35 311.85 −4.4 — — — — 16.761 ± 0.029 — — ZTF
2021-04-08.41 312.91 −3.4 — — 16.284 ± 0.018 16.371 ± 0.024 — — — ZTF
2021-04-09.32 313.82 −2.5 16.362 ± 0.016 16.321 ± 0.015 — — 16.686 ± 0.020 — — LCOGT
2021-04-09.55 314.05 −2.3 — — — — — 16.293 ± 0.006 — ATLAS
2021-04-10.06 314.56 −1.8 16.486 ± 0.033 16.251 ± 0.072 — 16.392 ± 0.012 16.759 ± 0.012 — — LCOGT
2021-04-10.44 314.94 −1.5 — — — — 16.704 ± 0.028 — — ZTF
2021-04-11.36 315.86 −0.6 16.339 ± 0.019 16.239 ± 0.018 16.139 ± 0.029 16.042 ± 0.031 16.742 ± 0.028 — — LCOGT,ZTF
2021-04-12.45 316.95 0.5 16.326 ± 0.017 16.255 ± 0.017 — — 16.766 ± 0.022 — — LCOGT
2021-04-13.41 317.91 1.4 — — 16.210 ± 0.006 16.289 ± 0.006 16.719 ± 0.027 — — YSE,ZTF
2021-04-13.52 318.02 1.5 — — — — — 16.249 ± 0.006 — ATLAS
2021-04-15.34 319.84 3.3 16.416 ± 0.020 16.274 ± 0.016 16.221 ± 0.018 16.369 ± 0.015 16.732 ± 0.024 — — LCOGT,ZTF
2021-04-15.49 319.99 3.4 — — — — — — 16.425 ± 0.008 ATLAS
2021-04-17.44 321.94 5.3 — — — — 16.743 ± 0.028 16.378 ± 0.007 — ATLAS,ZTF
2021-04-17.58 322.08 5.4 — — 16.331 ± 0.006 — 16.728 ± 0.008 — — YSE
2021-04-18.33 322.83 6.1 — — 16.301 ± 0.023 16.343 ± 0.020 — — — ZTF
2021-04-19.47 323.97 7.2 — — — — — — 16.553 ± 0.009 ATLAS
2021-04-20.35 324.85 8.1 — — 16.447 ± 0.021 16.404 ± 0.025 16.935 ± 0.028 — — ZTF
2021-04-22.46 326.96 10.1 — — — 16.575 ± 0.007 — — — YSE
2021-04-23.11 327.61 10.8 16.887 ± 0.022 16.537 ± 0.016 — 16.756 ± 0.021 17.017 ± 0.027 — — LCOGT
2021-04-23.47 327.97 11.1 — — — — — — 16.750 ± 0.014 ATLAS
2021-04-24.38 328.88 12.0 — — 16.737 ± 0.023 16.636 ± 0.026 — — 16.821 ± 0.020 ATLAS,ZTF
2021-04-25.01 329.51 12.6 16.568 ± 0.653 — — — — — — LCOGT
2021-04-25.41 329.91 13.0 — — 16.743 ± 0.024 — 16.999 ± 0.035 — 16.848 ± 0.019 ATLAS,ZTF
2021-04-27.48 331.98 15.0 — — — — — — 16.885 ± 0.061 ATLAS
2021-04-29.38 333.88 16.8 17.573 ± 0.062 16.949 ± 0.034 — — 17.033 ± 0.038 — 16.906 ± 0.015 ATLAS,LCOGT
2021-04-30.42 334.92 17.8 — — 17.245 ± 0.025 16.790 ± 0.026 17.074 ± 0.031 — — ZTF
2021-05-01.41 335.91 18.8 — — 17.370 ± 0.031 16.869 ± 0.026 — — 16.977 ± 0.031 ATLAS,ZTF
2021-05-02.40 336.90 19.7 — — 17.404 ± 0.027 16.826 ± 0.026 — — — ZTF
2021-05-02.61 337.11 19.9 — — — 16.907 ± 0.009 17.052 ± 0.010 — — YSE
2021-05-03.19 337.69 20.5 18.059 ± 0.029 17.175 ± 0.019 — — 17.034 ± 0.024 — — LCOGT
2021-05-03.52 338.02 20.8 — — — — — — 16.985 ± 0.012 ATLAS
2021-05-05.38 339.88 22.6 — — 17.722 ± 0.030 16.896 ± 0.029 — 17.463 ± 0.065 — ATLAS,ZTF
2021-05-06.40 340.90 23.6 — — 17.886 ± 0.031 17.002 ± 0.024 — — — ZTF
2021-05-07.36 341.86 24.5 — — 17.970 ± 0.033 17.124 ± 0.022 — — — ZTF
2021-05-07.58 342.08 24.7 — — — — — — 17.107 ± 0.016 ATLAS
2021-05-08.37 342.87 25.5 — — 18.066 ± 0.034 — — — — ZTF
2021-05-08.55 343.05 25.7 — — 18.051 ± 0.015 17.198 ± 0.008 — — — YSE
2021-05-09.46 343.96 26.5 — — 18.122 ± 0.036 — — 17.693 ± 0.022 — ATLAS,ZTF
2021-05-10.36 344.86 27.4 — — — — 17.151 ± 0.035 — — ZTF
2021-05-11.29 345.79 28.3 18.845 ± 0.106 17.707 ± 0.041 18.280 ± 0.037 17.232 ± 0.031 17.316 ± 0.076 — — LCOGT,ZTF
2021-05-11.49 345.99 28.5 — — 18.297 ± 0.016 — 17.280 ± 0.008 — 17.318 ± 0.015 ATLAS,YSE
2021-05-12.38 346.88 29.4 18.936 ± 0.015 17.850 ± 0.012 18.367 ± 0.039 17.427 ± 0.010 — — — LCOGT,ZTF
2021-05-13.47 347.97 30.4 — — — — — 17.876 ± 0.022 — ATLAS
2021-05-14.29 348.79 31.2 18.922 ± 0.077 17.851 ± 0.064 — — 17.469 ± 0.027 — — LCOGT
2021-05-15.37 349.87 32.2 — — 18.513 ± 0.043 17.455 ± 0.031 17.422 ± 0.040 — 17.514 ± 0.018 ATLAS,ZTF
2021-05-17.41 351.91 34.2 — — — — — 18.088 ± 0.025 — ATLAS
2021-05-18.34 352.84 35.1 — — 18.597 ± 0.046 17.678 ± 0.033 17.530 ± 0.041 — — ZTF
2021-05-19.32 353.82 36.1 19.118 ± 0.042 18.121 ± 0.023 — 17.649 ± 0.032 17.767 ± 0.028 — 17.727 ± 0.014 ATLAS,LCOGT,ZTF
2021-05-19.51 354.01 36.2 — — 18.606 ± 0.027 — 17.687 ± 0.014 — — YSE
2021-05-20.38 354.88 37.1 — — 18.695 ± 0.053 17.750 ± 0.032 — — — ZTF
2021-05-21.43 355.93 38.1 — — — 17.846 ± 0.039 17.827 ± 0.072 18.145 ± 0.030 — ATLAS,ZTF
2021-05-22.34 356.84 39.0 — — 18.596 ± 0.057 17.763 ± 0.036 — — — ZTF
2021-05-23.40 357.90 40.0 — — — — — — 17.883 ± 0.026 ATLAS
2021-05-24.37 358.87 40.9 — — 18.667 ± 0.091 17.834 ± 0.046 — — 17.835 ± 0.048 ATLAS,ZTF
2021-05-25.39 359.89 41.9 — — 18.668 ± 0.107 — 17.854 ± 0.064 — — ZTF
2021-05-26.03 360.53 42.5 19.331 ± 1.136 — — — 17.952 ± 0.488 — — LCOGT
2021-05-27.31 361.81 43.8 — — 18.803 ± 0.098 17.895 ± 0.046 — — — ZTF
2021-05-27.45 361.95 43.9 — — 18.788 ± 0.117 — — — — ZTF
2021-05-27.54 362.04 44.0 — — — — — — 17.917 ± 0.168 ATLAS
2021-05-28.31 362.81 44.7 — — 18.679 ± 0.076 17.893 ± 0.042 17.965 ± 0.056 — — ZTF
2021-05-29.35 363.85 45.7 — — 18.755 ± 0.072 17.966 ± 0.040 — — — ZTF
2021-05-29.40 363.90 45.8 — — — — — — 18.137 ± 0.045 ATLAS
2021-05-29.50 364.00 45.9 — — — 18.030 ± 0.023 18.094 ± 0.023 — — YSE
2021-05-30.37 364.87 46.7 — — — 17.959 ± 0.041 — — 18.115 ± 0.031 ATLAS,ZTF
2021-05-30.98 365.48 47.3 19.200 ± 0.086 18.379 ± 0.041 — — 18.151 ± 0.038 — — LCOGT
2021-05-31.35 365.85 47.7 — — 18.853 ± 0.059 18.020 ± 0.039 18.110 ± 0.056 — — ZTF
2021-06-01.34 366.84 48.6 — — 18.922 ± 0.059 18.060 ± 0.041 — — — ZTF
2021-06-02.36 367.86 49.6 — — 18.874 ± 0.062 18.120 ± 0.042 — — 18.209 ± 0.033 ATLAS,ZTF
2021-06-03.31 368.81 50.5 — — 18.924 ± 0.058 18.161 ± 0.041 18.194 ± 0.059 — — ZTF
2021-06-04.31 369.81 51.5 19.471 ± 0.037 18.495 ± 0.025 18.895 ± 0.057 18.162 ± 0.042 18.391 ± 0.029 18.463 ± 0.026 — ATLAS,LCOGT,ZTF
2021-06-06.34 371.84 53.4 — — 18.987 ± 0.058 18.207 ± 0.042 — — — ZTF
2021-06-06.41 371.91 53.5 — — — — — — 18.275 ± 0.033 ATLAS
2021-06-06.50 372.00 53.6 — — 18.942 ± 0.047 — 18.340 ± 0.022 — — YSE
2021-06-08.19 373.69 55.2 — — — — 18.491 ± 0.076 — — ZTF
2021-06-09.47 374.97 56.5 — — 19.102 ± 0.047 18.321 ± 0.025 — — — YSE
2021-06-10.33 375.83 57.3 — — 18.950 ± 0.060 18.398 ± 0.049 — — — ZTF
2021-06-11.30 376.80 58.2 — — 18.991 ± 0.062 18.364 ± 0.047 — — — ZTF
2021-06-12.38 377.88 59.3 — — 19.042 ± 0.062 18.417 ± 0.049 — 18.693 ± 0.033 — ATLAS,ZTF
2021-06-13.19 378.69 60.1 19.543 ± 0.033 18.687 ± 0.025 — — 18.696 ± 0.026 — — LCOGT
2021-06-13.28 378.78 60.1 — — 19.044 ± 0.062 18.437 ± 0.050 18.582 ± 0.074 — — ZTF
2021-06-13.45 378.95 60.3 — — 19.046 ± 0.030 — 18.584 ± 0.021 — — YSE
2021-06-14.33 379.83 61.2 — — 19.051 ± 0.071 18.513 ± 0.052 — — — ZTF
2021-06-15.08 380.58 61.9 19.569 ± 0.052 18.370 ± 0.208 — — — — — LCOGT
2021-06-16.33 381.83 63.1 — — 18.976 ± 0.105 18.580 ± 0.116 18.718 ± 0.113 — — ZTF
2021-06-16.45 381.95 63.2 — — 19.105 ± 0.040 18.551 ± 0.031 — — — YSE
2021-06-17.29 382.79 64.0 — — 19.075 ± 0.087 18.511 ± 0.060 — — — ZTF
2021-06-18.33 383.83 65.0 — — 19.082 ± 0.097 18.543 ± 0.072 — — 18.525 ± 0.048 ATLAS,ZTF
2021-06-18.81 384.31 65.5 19.614 ± 0.106 18.905 ± 0.054 — — 18.873 ± 0.063 — — LCOGT
2021-06-19.43 384.93 66.1 — — 19.211 ± 0.053 — 18.772 ± 0.026 — 18.868 ± 0.179 ATLAS,YSE
2021-06-20.37 385.87 67.0 — — 19.138 ± 0.105 18.660 ± 0.071 — — 18.739 ± 0.083 ATLAS,ZTF
2021-06-21.37 386.87 67.9 — — — — — — 18.661 ± 0.109 ATLAS
2021-06-22.19 387.69 68.7 19.785 ± 0.236 18.804 ± 0.096 19.247 ± 0.163 18.593 ± 0.087 18.912 ± 0.132 — — LCOGT,ZTF
2021-06-22.43 387.93 69.0 — — — — — — 18.967 ± 0.155 ATLAS
2021-06-23.38 388.88 69.9 — — — — — — 18.900 ± 0.132 ATLAS
2021-06-24.36 389.86 70.8 — — — — — — 18.942 ± 0.127 ATLAS
2021-06-24.87 390.37 71.3 19.573 ± 0.274 18.932 ± 0.136 — — 18.785 ± 0.142 — — LCOGT
2021-06-25.40 390.90 71.8 — — — — — — 18.409 ± 0.143 ATLAS
2021-06-26.31 391.81 72.7 — — — 18.803 ± 0.081 19.005 ± 0.134 — — ZTF
2021-06-26.38 391.88 72.8 — — — — — — 18.886 ± 0.077 ATLAS
2021-06-26.41 391.91 72.8 — — — 18.811 ± 0.034 18.967 ± 0.032 — — YSE
2021-06-27.85 393.35 74.2 19.777 ± 0.127 19.109 ± 0.076 — — 19.128 ± 0.087 — — LCOGT
2021-06-28.35 393.85 74.7 — — 19.139 ± 0.080 18.927 ± 0.073 — — 19.027 ± 0.061 ATLAS,ZTF
2021-06-29.25 394.75 75.5 — — — — 18.964 ± 0.116 — — ZTF
2021-06-30.27 395.77 76.5 — — 19.218 ± 0.159 18.739 ± 0.189 — — — ZTF
2021-06-30.41 395.91 76.7 — — — 18.936 ± 0.031 19.139 ± 0.037 — — YSE
2021-07-02.35 397.85 78.5 — — 19.406 ± 0.087 — 19.131 ± 0.134 — 19.106 ± 0.054 ATLAS,ZTF
2021-07-06.37 401.87 82.4 — — — — 19.309 ± 0.034 — 19.327 ± 0.065 ATLAS,YSE
2021-07-08.38 403.88 84.4 — — — — — 19.227 ± 0.059 — ATLAS
2021-07-10.34 405.84 86.2 — — — — — — 19.237 ± 0.068 ATLAS
2021-07-13.40 408.90 89.2 — — 19.516 ± 0.045 — 19.466 ± 0.042 — — YSE
2021-07-14.33 409.83 90.1 — — — — — — 19.450 ± 0.070 ATLAS

Notes.

(a)

Rest-frame days relative to the epoch of B-band maximum, i.e., JD 2459316.46.

(b)

The abbreviations for the telescope/instrument are: LCOGT - Las Cumbres Observatory telescope network observations through FLOWS survey; ATLAS - ATLAS survey telescope orange and cyan filter observations; YSE - Pan-STARRS survey telescope observation through YSE survey; ZTF - ZTF survey telescopes. Data observed within 5 hr are represented under a single-epoch observation.

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