*6.1. GRBs with Associated Supernovae*

As discussed in Section 5.5, Group 2 is associated with collapsar bursts. Thus, it is expected that GRBs with associated supernovae will lie within Group 2. The list of 31 *Swift* and 10 *Fermi* Supernova (SN)-GRBs provided in Cano et al. [107] is extended to include additional SN-GRB events GRB 161219B/SN 2016jca [108], GRB 171205A/SN 2017htp [109], GRB 180728A/SN 2018fip [110,111], GRB 190114C/SN 2019jrj and GRB 190829A/AT2019 oyw [112] and the peculiar short GRB 200826A [113–115]. Figure 9 indicates the location of these bursts within the t-SNE plot. The 25 SN-GRBs for which light curve files are available lie in Group 2 of *Swift*/BAT and *Fermi*/GBM, as expected, with the exception of GRB 101219B, which is an outlier to *Swift*/BAT Group 1 but lies within Group 2 of *Fermi*/GBM bursts. The analysis using the T<sup>100</sup> interval correctly places GRB 101219B in Group 2 for *Swift*/BAT. The shortest collapsar burst detected to date, GRB 200826A, lies within Group 2 of the *Fermi*/GBM sample despite its observed duration of T<sup>90</sup> ≈ 0.96 s [115].

**Figure 9.** Locations of GRBs with associated Supernovae (GRB/SN) and possible Kilonovae (GRB/KN) within the t-SNE projections of the T<sup>1</sup> interval for (**a**) *Swift*/BAT and (**b**) *Fermi*/GBM. The location of the only confirmed kilonova, associated with GRB 170817A, is indicated with a black star.

The remaining bursts are identified in Group 2, with their classifications unchanged by the interval used in analysis, with the exception of GRB 050824, which migrates to Group 1 when the T<sup>100</sup> interval is used for analysis.
