J/A+A/702/A95ivo://CDS.VizieR/J/A+A/702/A95doi:10.26093/cds/vizier/bc-ny/ljfCDSMaccary R.Guidorzi C.Camisasca A.E.Maistrello M.Kobayashi S.,Amati L.Bazzanini L.Bulla M.Ferro L.Frontera F.Tsvetkova A.2026-08-03T06:58:43Z2025-10-10T10:16:31ZCDS support team

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

cds-question@unistra.frgamma-ray-astronomygamma-ray-burstsGamma-ray bursts (GRBs) have traditionally been classified by duration into long (LGRBs) and short (SGRBs), with the former believed to originate from massive star collapses and the latter from compact binary mergers. However, events such as the SGRB 200826A (coming from a collapsar) and the LGRBs 211211A and 230307A (associated with a merger) suggest that duration- based classification could be sometimes misleading. Recently, the minimum variability timescale (MVT) has emerged as a key metric for classifying GRBs. We calculate the MVT, defined as the full width at half maximum (FWHM) of the narrowest pulse in the light curve, using an independent dataset from Fermi/GBM and we compare our results with other MVT definitions. We update the MVT-T 90 plane and analyse peculiar events like long-duration merger candidates 211211A, 230307A, and other short GRBs with extended emission (SEE-GRBs). We also examine extragalactic magnetar giant flares (MGFs) and explore possible new correlations with peak energy. Methods. We used the mepsa algorithm to identify the shortest pulse in each GRB light curve and measure its FWHM. We calculated the MVT for around 3700 GRBs, 177 of which with spectroscopically known redshift. SEE-GRBs and SGRBs share similar MVTs (from few tens to a few hundreds of ms), indicating a common progenitor, while extragalactic MGFs exhibit even shorter values (from few ms to few tens of ms). Our MVT estimation method consistently yields higher values than another existing technique, the latter aligning with the pulse rise time. For LGRBs, we confirmed the correlations of MVT with peak luminosity and Lorentz factor. We confirmed that, although MVT alone cannot determine the GRB progenitor, it is a valuable tool when combined with other indicators, helping to flag long-duration mergers and distinguish MGFs from typical SGRBs.2025A&A...702A..95Mhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/702/A95CatalogResearchIsServedByTAP 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/A95https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/702/A95http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/702/A95https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/702/A95https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/702/A95http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/702/A95GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/702/A95/table1 (GRBs of our sample)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/702/A95/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/702/A95/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/702/A95/table1?GETtext/xml+votable180.050000true42.08.50.0055555555555555566/17 121 137 146 185 202 205 210-211 213 228 240 270 286 304 307 346 351 375 383 390 418 421 435 462 524 549 584 607 641 646 651-652 670 691 698 799 845 888 962 986 1040 1049 1059 1127 1132-1133 1142 1145 1161 1173 1184 1209 1214 1234 1247 1252 1266 1334 1340 1396 1440 1445 1449 1517 1520 1532 1605 1632 1649 1652 1685 1695 1710 1719 1729 1755 1775 1790 1806 1827 1904 1918 1977 2018 2025 2027-2028 2042 2064 2093 2111 2186 2191 2201 2275 2295 2307 2315 2324 2336 2363 2391 2396 2414 2432 2463 2477 2492 2503 2507 2533 2536 2540 2563 2574 2643 2682-2683 2717 2739 2751 2793 2875 2916 2942-2943 2948 2987 2994 3038 3048 3053 3060 3089-3090 3098 3109 3111 3145 3164 3240 3243 3274 3288 3314 3316 3318 3323 3417 3437-3438 3473 3553 3555 3579 3586 3602 3637 3640 3659 3675 3684 3718 3723 3737-3738 3759 3825 3839 3861 3881 3900 3906 3923 3938 3945 3972 4007 4060 4067 4140 4209 4227-4228 4236-4237 4264 4271 4287 4324 4347 4355 4362 4395 4403 4449-4450 4487 4558 4573 4595 4628 4670 4690 4693 4711 4717 4726 4741 4751 4822 4862 4887 4902 4963 4997 5011 5051-5052 5061 5065 5073 5093 5098 5131 5135 5148 5151 5153 5162 5167 5180 5197 5208 5223 5228 5243-5244 5260 5267 5281 5307 5323 5346 5371 5389 5438 5481 5505 5530 5540 5559 5585 5612-5613 5625 5650 5655 5657 5715 5717 5719 5756 5776 5790-5791 5804 5871 5909 5916 5918 5922 5933 5940 5945 5953 5999 6010 6012 6025 6047 6068 6090 6103 6111 6117 6151-6152 6173 6214 6216 6228 6261 6270 6272 6291 6348 6378 6392 6439 6441 6515 6518 6533 6543 6576 6581 6595 6644 6676 6686 6709 6734 6737 6757 6802 6827 6873 6933 6943 6969 6987 6992 7023 7055 7081 7091 7094 7117 7150 7163-7164 7169 7176-7177 7182 7207 7307 7322 7330 7332 7356 7364 7370 7392 7401 7416 7438 7454 7463 7466 7492 7519 7558 7581 7589 7598 7601 7614 7641 7665 7729 7750 7782 7789 7792 7805 7809 7820 7833 7839 7847 7886 7890 7955 7985 7987 7989 8023 8044 8097 8107 8138 8140 8150 8182 8187 8189 8224 8248 8285 8292 8308 8320 8328 8333 8345 8362 8378 8413 8478 8499 8569 8617 8624 8674 8733 8741 8755 8789 8795 8803 8809 8857 8863 8892 8897 8910 8925-8926 8932 8940 8955 8966 8976 8988 9022-9023 9030 9060 9075 9108 9142 9173 9177 9212 9230 9236 9240 9271 9276 9278 9317 9319 9343 9378 9399 9409 9419 9431 9449 9488 9490 9498 9512 9524-9525 9536 9547 9576 9662 9675 9693 9713 9733 9735 9814 9817 9827 9829 9851 9881 9899 9912 9917 9931 9933 9937 9984 10020 10028 10046 10052 10086 10108 10129 10176 10178 10198 10242 10287 10290 10308 10330 10342 10353-10354 10358 10400 10405 10407 10415 10424 10444 10473 10493-10494 10508 10529 10565-10566 10578 10625 10631 10666 10687 10721 10735 10742 10746 10756 10761 10774 10785 10889 10914 10994 10999 11002 11026 11031 11035 11058 11089 11102 11127 11133 11138 11140 11151 11159 11169 11177 11209 11212 11220 11248 11256 11286 11304 11308 11311 11344 11365 11372 11418 11428 11432 11445 11448 11478 11506 11514 11545-11546 11563 11580 11701 11708 11748-11749 11799 11812 11821-11822 11838 11879-11880 11904 11928 11946-11947 11961 12005 12149 12153 12155 12170 12174 12187 12207 12230 12233 12287 12304 12333 12341 12361 12402 12419 12425 12438 12468 12491 12558 12565 12588 12619 12631 12641 12686 12702 12726 12739 12771 12826-12827 12906 13005 13028 13094 13166 13173 13182 13191 13215 13230 13245-13246 13252 13313 13328 13333 13350 13359 13411 13419 13426 13476 13479 13528 13542 13559 13561 13567 13585 13633 13717 13725 13727 13731 13768 13770 13779 13787 13828 13854 13870 13887 13896 13910 13931 14022 14034 14056 14058-14059 14065 14093 14098 14143 14248 14319 14325 14365 14378 14397 14404 14448 14453-14454 14482 14492 14511 14516-14517 14555 14561 14567 14588 14618 14624 14655 14665 14697 14702 14715 14745-14746 14782 14810 14883 14929 14948 14963 14967 14975 14995 15026 15071 15105 15201 15213 15233 15294 15315 15320 15326 15340 15344 15354 15360 15382-15383 15484-15485 15498 15502 15530 15553 15557 15563 15570 15588 15595 15626 15629 15702 15712 15790 15833 15835 15860 15869 15877 15892 15940 15951 16000 16008 16028 16037 16046 16049 16057 16070 16084 16086 16097 16106 16137 16156 16186-16187 16197 16282 16292 16305 16318 16353 16361 16367 16427 16430 16433 16438 16468-16469 16523 16556 16572 16614 16631 16633 16653 16661 16672 16692-16693 16724 16730 16846 16855 16884 16893 16911 16914 16935 16959 16970 16976 16995 17030 17067 17091 17093 17103 17140 17156 17161 17163 17170 17185 17217 17232 17262 17269 17272 17306 17325 17395 17404 17411 17464 17526 17530-17531 17578 17633 17646 17655 17661 17703 17749 17755 17759 17793 17799 17823 17877 17904 17944 17962 17980 17982 18010 18063 18133 18149 18161 18171 18190 18201 18263 18286 18297 18339 18345 18360 18399 18424 18435 18457 18538 18596 18653 18671 18691 18697 18702 18704 18731 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33616 33646-33647 33655 33667 33702 33729 33749 33751 33753 33755 33799 33813 33832 33860 33907 33924-33925 33961 33994 34018 34038 34133 34165 34231 34240 34302 34364 34432 34449 34461 34484 34491 34513 34534 34616 34619 34676 34679 34708 34814 34816 34831 34860 34878 34899 34917 34952 34999 35045 35055 35143 35160 35196 35200 35207 35221 35228 35239 35241-35242 35263 35380 35392 35448 35479-35480 35492 35503 35516 35533 35553 35557 35569 35594 35633 35652 35708 35710 35721 35724 35731 35738 35764 35769 35798 35812 35844 35899 35970 36031 36035 36060 36102 36107 36137 36142 36232 36241-36242 36265 36273 36280 36286 36308 36355 36364 36377 36394 36442 36444-36445 36460 36508 36532 36536 36542 36553 36576 36637 36654 36667 36701 36744 36764 36793 36800 36812 36820 36851 36858 36905 36974 37060 37088 37113 37128 37133 37148 37152 37179 37184 37217 37231 37244 37251 37281 37294 37323-37324 37327 37330 37360 37391 37400 37412 37433 37440 37446 37450 37459 37505 37510 37527 37534 37550 37580 37628 37651 37664 37669 37672 37675 37704 37717 37731 37737 37803 37805 37873 37896 37903 37909-37910 37935 37948 37955 37957 38004 38040-38041 38049 38055 38092 38125 38145 38152 38158 38168 38200 38235-38236 38273 38282 38294 38314 38319 38327 38365 38381 38388 38398 38418 38450 38463 38485 38585 38601 38607 38615 38629 38652 38716 38767 38774 38793 38797 38810 38813 38905 38916 38920 38944 38949 38952 38965 38976 39001 39007 39023 39076 39184 39190 39194 39206 39210 39218 39233 39304 39337 39349 39370 39380 39401 39409 39411 39418 39436 39443 39460 39491 39506 39521 39538 39594 39596 39630 39643 39659 39682 39695 39711 39762 39798 39809 39818 39828 39839 39872 39878 39911 39922 39924 39951 39988 39992 39994 40010 40026 40044 40047 40071 40075 40102 40116 40154 40158 40167 40184 40272 40293 40299 40312 40362-40363 40372 40381 40413 40417 40446 40461 40484 40542 40587 40599 40632 40666 40687 40699 40763 40765 40778 40802 40835 40839 40854 40863 40868 40934 40939-40940 40957 40961 41036 41040 41063 41088 41090 41112 41137 41144 41189 41222 41237 41250-41251 41258 41273-41274 41298 41309 41311 41323 41352 41394 41471 41483 41485 41541-41542 41545 41550 41581 41587 41596 41613 41677 41682 41709 41722 41729 41754 41761-41762 41775 41889 41902 41936 41980 41990 42025 42053 42080 42128 42133 42155 42170 42216 42282 42289 42303 42308 42333 42367 42399 42401 42441 42454 42471 42473 42486 42518 42524 42544-42545 42574 42606 42610 42650 42665 42684 42702 42710 42718 42725 42754 42761 42773 42797 42819-42820 42888 42904 42930 43005 43031 43045 43051 43086 43098 43106 43113 43147 43151 43160 43173 43201 43223 43229 43262 43274 43278 43293 43307 43310-43311 43316 43322 43372 43382 43388 43403 43426 43498 43547 43600 43688 43710 43728 43755 43779 43795 43835-43836 43891-43892 43907 43918 43930 43941 44006 44036 44073 44093 44148 44158-44159 44165 44202 44223 44228 44237 44277 44291 44303 44307 44311 44358 44384 44436 44481 44498 44599 44617 44635 44655 44666 44670 44715 44768 44773 44876 44889 44897 44922 44928 44948 44976 44979 44985 45009 45032 45064 45088 45134 45137 45159 45172 45182 45191 45259 45263 45283 45306 45361 45373 45391 45401 45413 45464 45481 45483 45486 45491 45493 45509 45523 45559 45567 45572 45584 45658 45671 45680 45701 45731 45745 45757 45777 45813 45828 45835 45837 45852 45868 45893 45951 45969 45971 46000 46032 46071 46097 46150 46173 46198 46209 46212 46218 46225 46234 46250 46322 46359 46385 46454 46472 46490 46519 46529 46594 46621 46650 46681 46693 46710 46732 46748 46793 46813 46821 46824 46826 46829 46834-46835 46839 46847 46914 46953 46959 46973 47014 47031 47035 47044 47057 47069 47085 47093 47097 47116 47121 47126 47148 47152-47153 47159 47162 47189 47201 47245 47253 47281 47291 47293 47310 47313 47368 47371 47389 47427 47432 47435 47438 47441 47480 47528 47531 47548 47617 47628 47666-47667 47711 47744 47770 47787 47825 47828 47839 47856 47911 47966 48011 48013 48029 48099 48101 48131 48134 48144 48171 48213-48214 48219 48223 48262 48315 48336 48377 48387 48400 48402-48403 48410 48477 48481 48485 48498 48506 48526 48557 48571 48633 48637 48643 48666 48704 48741 48757 48765 48771 48792 48803 48821 48908 48934 48950 48953 48958 48976 48988 48996 49062 49080 49089 49127https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/702/A95?format=asciiGamma-raydefaultJ/A+A/702/A95/table1GRBs of our samplerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintGRBGRB name (GRBYYMMDDX format)meta.id;meta.maincharn_GRB[*] * for GRB not appear with a GCN-style name in the literaturemeta.notecharFermiFermi/GBM trigger IDmeta.idcharFWHMMinimum variability timescale (MVT)ssrc.var;stat.mindoublee_FWHM[] Negative error on the MVTsstat.error;phys.angSizedoubleE_FWHMPositive error on the MVTsstat.error;stat.maxdoublet90T90 durationstime.durationdoubleNpeaks? Number of peaks in the GRB light curvemeta.numberfloatnullablez? Redshiftsrc.redshiftdoublenullableClassClassification of the GRB (1)meta.code.classchar_RAPositions from Simbad (right ascension part)degpos.eq.ra;meta.mainnullable_DEPositions from Simbad (declination part)degpos.eq.dec;meta.mainnullable