Left: R-band optical light curves of CDF-S XT1 (red) compared to long and short GRBs (Kann et al. 2006, 2010, 2011; Nicuesa Guelbenzu et al. 2012), the SBO SN 2008D (Soderberg et al. 2008), the low-luminosity events XRF 060218-SN 2006aj and XRF 100316D-SN 2010BH, the relativistic Ic-BL SN 2018gep (Ho et al. 2019), LFBOT AT2018cow (Xiang et al. 2021), and Type II-pec SN 1987A (50 kpc), SN 1999br (7.1 Mpc) and Type II-P SN 2005cs (8.6 Mpc). The HST F110W constraint at 111 days is displayed for the range m_R − m_F110W ≈ 0.4 − 1.0 mag typical of GRBs (Kann et al. 2006, 2010, 2011). Right: 9 GHz upper limit of CDF-S XT1 (red) compared to low-frequency (1−10 GHz) light curves of different classes of energetic explosions such as TDEs (Zauderer et al. 2011, 2013; Berger et al. 2012; Alexander et al. 2016; Eftekhari et al. 2018), SNe exploding in dense circumstellar medium (Soderberg et al. 2005; Salas et al. 2013) and normal SNe (Weiler et al. 1986), relativistic Ic-BL SNe (Kulkarni et al. 1998; Soderberg et al. 2010), LGRBs (GRB 030329A, GRB 111209A, and GRB 130427A; Berger et al. 2003; Hancock et al. 2012; Perley et al. 2014; van der Horst et al. 2014), and luminous fast blue optical objects (LFBOTs; Margutti et al. 2019; Coppejans et al. 2020; Ho et al. 2020a).