J/A+A/707/A382ivo://CDS.VizieR/J/A+A/707/A382CDSAcharyya A.Aharonian F.Arcaro C.Ashkar H.Backes M.,Barbosa Martins V.Batzofin R.Becherini Y.Berge D.Bernloehr K.,Boettcher M.Boisson C.Bolmont J.Borowska J.Brun F.Bruno B.,Burger-Scheidlin C.Casanova S.Celic J.Cerruti M.Chandra S.Chen A.,Chernyakova M.Chibueze J.O.Chibueze O.Collins T.Cornejo B.,Cotter G.Damascene Mbarubucyeye J.Davids I.D.de Assis Scarpin J.,de Bony de Lavergne M.de Naurois M.de Ona Wilhelmi E.,Delgado Giler A.G.Devin J.Djannati-Atai A.Djuvsland J.Dmytriiev A.,Egberts K.Egg K.Ernenwein J.-P.Escanuela Nieves C.Filipovic M.D.,Fontaine G.Funk S.Gabici S.Gallant Y.A.Genaro M.Glicenstein J.F.,Glombitza J.Grondin M.-H.Heckmann L.Hess B.Hinton J.A.Hofmann W.,Holch T.L.Holler M.Horns D.Huang Z.Jamrozy M.Jankowsky F.,Jaroschewski I.Jung-Richardt I.Kasai E.Kasprzak K.Katarzynski K.,Kerszberg D.Khelifi B.Kluzniak W.Komin N.Kosack K.Kostunin D.,Lang R.G.Lazarevic S.Lemoine-Goumard M.Lenain J.-P.Liniewicz P.,Luashvili A.Mackey J.Malyshev D.Malyshev D.Marandon V.Mayer M.,Mehta A.Mikhno A.Mitchell A.M.W.Moderski R.Moghadam M.O.,Mohrmann L.Montanari A.Moulin E.Niemiec J.O'Brien P.,Olivera-Nieto L.Panny S.Panter M.Parsons R.D.Pensec U.Pichard P.,Pita S.Puehlhofer G.Punch M.Quirrenbach A.Regeard M.Reimer A.,Reimer O.Reis I.Ren H.Reville B.Rieger F.Rudak B.,Ruiz-Velasco E.Sabri K.Sahakian V.Salzmann H.Sanchez D.A.,Jimeno D.Santangelo A.Sasaki M.Schuessler F.Senniappan M.,Shapopi J.N.S.Si Said W.Sol H.Spencer S.Stawarz L.Steinmassl S.,Tanaka T.Taylor A.M.Taylor G.L.Terrier R.Tsirou M.Unbehaun T..,van Eldik C.Vecchi M.Venter C.Vink J.Wach T.Wagner S.J.,Wierzcholska A.Zacharias M.Zdziarski A.A.Zhong W.Zhu S.J.Zech A.2026-04-02T06:28:33Z2026-03-20T07:35:07ZCDS support team

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

cds-question@unistra.frgamma-ray-astronomyRecent observational efforts using imaging atmospheric Cherenkov telescopes (IACTs) have led to firm detections of very-high-energy (VHE) signals from bright gamma-ray bursts (GRBs), often at moderate redshifts. This work presents 15 years of H.E.S.S. GRB observations and examines their implications through population comparisons and selected modelling cases. GRBs are a key science target of the High Energy Stereoscopic System (H.E.S.S.). With a low-energy threshold (<~100GeV) and rapid repointing capabilities, H.E.S.S. can begin follow-up observations within tens of seconds after a GRB trigger, covering the late prompt or early afterglow phases. We report GRB follow-up observations with H.E.S.S. from 2004 to 2019, which resulted in no significant VHE signals (aside from the detections of GRB 180720B and GRB 190829A). The resulting upper limits comprise the largest set available for GRBs at VHE. A subset of bursts with favourable conditions were selected for X-ray analysis and emission modelling. Population studies were performed to compare detected and non-detected GRBs. The results indicate that VHE-detected GRBs are not a distinct population, but tend to feature luminous X-ray emission and favourable redshift and observing conditions. This highlights the potential of next-generation IACTs such as the Cherenkov Telescope Array Observatory (CTAO), whose lower energy threshold will enhance the detection of fainter and more distant GRBs.2026A&A...707A.382Ahttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/707/A382CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/707/A382https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/707/A382http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/707/A382https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/707/A382https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/707/A382http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/707/A382GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/707/A382/tablea3 (Multi-wavelength information from GCN Circulars)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/707/A382/tablea3?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/707/A382/tablea3?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/707/A382/tablea3?GETtext/xml+votable180.050000true13.720831.201110.005555555555555556Cone search capability for table J/A+A/707/A382/tablea4 (GRB analysis results)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/707/A382/tablea4?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/707/A382/tablea4?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/707/A382/tablea4?GETtext/xml+votable180.050000true13.70904171.23527780.0055555555555555566/576 4716 8789 10243 16432 16493 16661 17030 17721 18030 18097 18681 18728 19361 22026 24002 24097 27268 27302 27764 28749 28996 29052 29612 29693 30553 30557 30595 30947 31375 31385 31583 31762 33515 33525 33755 33925 34488 35440 36374 36528 39553 42175 42611 42782 43409 43594 43920 44021 44073 44599 45736 46022 46594 46839 47027 47432 48054 48189 48214 48422 48646 48821https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/707/A382?format=asciiGamma-raydefaultJ/A+A/707/A382/table1Modelling parameters and resultsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintParamParameter descriptionmeta.noteGRB10GRB 100621A Valuestat.fit.paramGRB13GRB 131030A Valuestat.fit.paramGRB16GRB 161001A Valuestat.fit.paramJ/A+A/707/A382/table2KS test p-values (Swift/BAT)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintParamParameter descriptionmeta.notePvalObsp-value observed vs Whole populationstat.fit.paramcharPvalDetp-value detected at VHE vs Wholestat.fit.paramcharPvalX19p-value detected (except GRB 190829A)stat.fit.paramcharJ/A+A/707/A382/table3KS test p-values (Fermi/GBM)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintParamParameter descriptionmeta.notePvalObsp-value observed vs Whole populationstat.fit.paramcharPvalDetp-value detected at VHE vs Wholestat.fit.paramcharPvalX19p-value detected (except GRB 190829A)stat.fit.paramcharJ/A+A/707/A382/table4KS test p-values (Swift/XRT)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintParamParameter descriptionmeta.notecharPvalObsp-value observed vs Whole populationstat.fit.paramcharPvalDetp-value detected at VHE vs Wholestat.fit.paramcharPvalX19p-value detected (except GRB 190829A)stat.fit.paramcharJ/A+A/707/A382/tablea1GRB population selection stagesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintStageSelection stagemeta.codecharNloc? Number of loc GRBs (0 if N/A)meta.numberintnullableNunloc? Number of un-loc GRBs (0 if N/A)meta.numberintnullableTotalTotal numbermeta.numberintJ/A+A/707/A382/tablea2H.E.S.S. follow-up observations (Fermi/GBM)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameGRB Name (Fermi/GBM ID)meta.id;meta.maincharT0Burst onset time (UTC)stime.epochnullableDelayObservation delaymintime;arith.difffloatConfigAnalysis configurationmeta.codecharJ/A+A/707/A382/tablea3Multi-wavelength information from GCN CircularsSimbadSimbad column added by the CDSmeta.ref.urlcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameGRB Namemeta.id;meta.maincharn_Name[p#* ] Note on Name (1)meta.notecharInstTrigger InstrumentinstrcharRAJ2000Right Ascension (J2000)pos.eq.ra;meta.mainDEJ2000Declination (J2000)pos.eq.dec;meta.mainePosLocalization uncertaintyarcminstat.errorfloatl_T90[~> ] Limit flag on T90meta.code.errorcharT90Burst duration (T90)stime.durationfloatRadio[YN-] Radio detectionmeta.codecharOpt[YN-] Optical detectionmeta.codecharHE[YN-] High-Energy gamma-ray detectionmeta.codecharJ/A+A/707/A382/tablea4GRB analysis resultsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameGRB Namemeta.id;meta.maincharT0Burst onset time (UTC)time.epochcharDelayObservation delaymintime;arith.difffloatExpExposure timehtime.duration;obs.exposurefloatConfigAnalysis configuration (e.g. stereo loose)meta.codecharNonNumber of ON eventsmeta.numberintNoffNumber of OFF eventsmeta.numberintAlphaAcceptance-weighted exposure ratiostat.fit.paramfloatSimbadSimbad column added by the CDSmeta.ref.urlcharSigniSignificance (in sigma)stat.fit.goodnessfloatEthEnergy thresholdGeVinstr.sensitivityintFlux1ULFlux UL (alpha=-2.5) in 10^-12 cm^-2 s^-11e-12cm**-2.s**-1phot.flux;em.X-rayfloatFlux2ULFlux UL (alpha=-5.0) in 10^-12 cm^-2 s^-11e-12cm**-2.s**-1phot.flux;em.X-rayfloat_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