J/A+A/702/A173ivo://CDS.VizieR/J/A+A/702/A173doi:10.26093/cds/vizier/bc-ny/lbhdCDSZhu S.-Y.Shao L.Tam P.-H.T.Zhang F.-W.2026-08-03T06:57:56Z2025-10-17T09:22:34ZCDS support team

CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France

cds-question@unistra.frgamma-ray-astronomygamma-ray-burstsredshiftedGamma-ray bursts (GRBs) are generally believed to originate from two distinct progenitors, compact binary mergers and massive collapsars. Traditional and some recent machine learning-based classification schemes predominantly rely on observer-frame physical parameters, which are significantly affected by the redshift effects and may not accurately represent the intrinsic properties of GRBs. In particular, the progenitors usually could only be decided by successful detection of the multi-band long-term afterglow, which could easily cost days of devoted effort from multiple global observational utilities. In this work, we apply the unsupervised machine learning (ML) algorithms called t-SNE and UMAP to perform GRB classification based on rest-frame prompt emission parameters. The map results of both t-SNE and UMAP reveal a clear division of these GRBs into two clusters, denoted as GRBs-I and GRBs-II. We find that all supernova-associated GRBs, including the atypical short-duration burst GRB 200826A (now recognized as collapsar-origin), consistently fall within the GRBs-II category. Conversely, all kilonova-associated GRBs (except for two controversial events) are classified as GRBs-I, including the peculiar long-duration burst GRB 060614 originating from a merger event. In another words, this clear ML separation of two types of GRBs based only on prompt properties could correctly predict the results of progenitors without follow-up afterglow properties. Comparative analysis with conventional classification methods using T_90_ and E_p,z_-E_iso_ correlation demonstrates that our machine learning approach provides superior discriminative power, particularly in resolving ambiguous cases of hybrid GRBs.2025A&A...702A.173Zhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/702/A173CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/702/A173https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/702/A173http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/702/A173https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/702/A173https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/702/A173http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/702/A173GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/702/A173/tablea2 (Rest-frame gamma-ray bursts (GRBs))https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/702/A173/tablea2?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/702/A173/tablea2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/702/A173/tablea2?GETtext/xml+votable180.050000true75.444583311.78138890.0055555555555555566/210 224 228 314 393 500 503 557 590 646 744 908 923 962 2044 2336 2574 2682 2735 2948 3089 3111 3536 3586 3839 3923 4060 4271 4449-4450 4955 5001 5051 5073 5135 5389 5481 5625 5657 5756 5790 5840 6111 6141 6258 6261 6521 6523 7227 7518 7532 7589 7650 7665 7750 7820 7975 8074 8103 8345 8373 8425 8569 8693 8733 8798 8955 9022 9321 9363 9370 9394 9431 9512 9643 9662 9897 9910 9989 9998 10020 10080 10094 10424 10447 10519 10589 10704 11058 11220 11308 11657 11673 11695 11708 11799 11822 11904 11947 12006 12134 12199 12230 12425 12438 12588 12597 13084 13182 13252 13312 13354 13450 13476 13694 13720 13779 13828 13924 14162 14259 14948 14967 15233 15246 15295 15326 15340 15360 15530 16057 16187 16282 16653 16661 16666 16991 17038 17086 17316 17395 17406 17411 17453 17531 17561 17703 17733 17749 17758 17814 17911 17980 17982 18030 18728 18777 18978 19097 19164 19168 19334 19389 19519 19544 19731 19785 19864 19890 19911 19946 20053 20191 20349 20372 20420 20460 20676 20679 20753 20774 21015 21284 21595 21962 22008 22392 22590 22793 22916 23138 23413 24072 24097 24779 24897 24902 24993 25146 25148 25192 25336 25426 25452 26365 26503 26585 27064 27262 27284 27320 27434 27502 27541 27810 27933 27961-27962 27965 28032 28058 28063 28234 28344 28497 28546 28555 28930 29019 29231 29731 30088 30170 30557 31120 31185 31281 31385 31494 31521 31583 31675 31721 31856 32239 32279 32310 32646 32713 32889 33004 33050 33066 33146 33278 33444 33525 33617 33735 33751 33813 33832 33860 33925 34147 34440 34488 34605 34699 34788 34832 34878 35227 35242 35285 35330 35392-35393 35448 35569 35633 35844 36035 36066 36107 36142 36297 36361 36460 36527-36528 36576 37123 37391 37505 38351 38688 39327 39427 39553 39594 39993 40249 40433 40778 40784 40943 41095 42133 42545 42952 43316 43853 44022 44264 44715 44857 45008 45347 45401-45402 45510 45835 45938 46022 46057 46150 46180 46212 46218 46488 46510 46594 46789 46899 46989 47031 47136 47148 47245 47588 47966 48054 48219 48447 48458 48804 48921 48968 49004https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/702/A173?format=asciiGamma-raydefaultJ/A+A/702/A173/tablea2Rest-frame gamma-ray bursts (GRBs)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintGRBGamma-ray burst namemeta.id;meta.maincharT90Duration in the observed framespos.frame;obs.fieldfloatS/L[LS] Classification based on T90 (1)meta.code.classcharzRedshiftsrc.redshiftdoubleT90zDuration in the rest framestime.durationfloatEpzPeak energy in the rest framekeVem.energyfloatEisoIsotropic energy1e-07Jem.energydoubleEH[I II] Classification based on the EH parameter (2)meta.code.classcharEHD[I II] Classification based on the EHD parameter (2)meta.code.classchart-SNE[I II] Classification based on the t-SNE method (3)meta.code.classcharUMAP[I II] Classification based on the UMAP method (3)meta.code.classcharAssoc[SN MGF KN] Association with other counterpartmeta.codecharSimbadSimbad column added by the CDSmeta.ref.urlchar_RARight Ascension (J2000) from SIMBAD (not part of the original data)degpos.eq.ra;meta.mainnullable_DEDeclination (J2000) from SIMBAD (not part of the original data)degpos.eq.dec;meta.mainnullable