2026ApJ...997..141A


Query : 2026ApJ...997..141A

2026ApJ...997..141A - Astrophys. J., 997, 141 (2026/February-1)

Prompt Searches for Very-high-energy γ-Ray Counterparts to IceCube Astrophysical Neutrino Alerts.

ABHIR J., BILAND A., BRAND K., BRETZ T., DORNER D., EISENBERGER L., ELSAESSER D., GUNTHER P., HASAN S., HILDEBRAND D., MANNHEIM K., LINHOFF M., PFEIFLE F., RHODE W., SCHLEICHER B., SLIUSAR V., VORBRUGG M., WALTER R. (The FACT Collaboration), AHARONIAN F., AIT BENKHALI F., ASCHERSLEBEN J., ASHKAR H., BACKES M., BARBOSA MARTINS V., BATZOFIN R., BECHERINI Y., BERGE D., BOTTCHER M., BOISSON C., BOLMONT J., BOROWSKA J., BROSE R., BROWN A., BRUN F., BRUNO B., CASANOVA S., CELIC J., CERRUTI M., CHEN A., CHERNYAKOVA M., CHIBUEZE J., CHIBUEZE O., CORNEJO B., COTTER G., COZZOLONGO G., DAMASCENE MBARUBUCYEYE J., DE ASSIS SCARPIN J., DELGADO GILES A., DJANNATI-ATAI A., DJUVSLAND J., DMYTRIIEV A., EGBERTS K., EGG K., EINECKE S., ERNENWEIN J.-P., ESCANUELA NIEVES C., FEIJEN K., FILIPOVIC M., FONTAINE G., FUNK S., GABICI S., GLICENSTEIN J.F., GOSWAMI P., GROLLERON G., HESS B., HINTON J.A., HOLLER M., JAMROZY M., JANKOWSKY F., JUNG-RICHARDT I., KASAI E., KATARZYNSKI K., KATJAITA H., KERSZBERG D., KHATOON R., KHELIFI B., KLUZNIAK W., KOMIN N., KONNO R., KOSACK K., KOSTUNIN D., KUKEC MEZEK G., LANG R.G., LEMIERE A., LEMOINE-GOUMARD M., LENAIN J.-P., LUASHVILI A., MACKEY J., MARANDON V., MARTI-DEVESA G., MARX R., MAYER M., MEHTA A., MITCHELL A., MODERSKI R., MOGHADAM M.O., MOHRMANN L., MOULIN E., DE NAUROIS M., NIEMIEC J., DE ONA WILHELMI E., PANNY S., PANTER M., PARSONS R.D., PENSEC U., PICHARD P., PUHLHOFER G., PUNCH M., QUIRRENBACH A., REGEARD M., REIMER O., REN H., RIEGER F., ROWELL G., RUDAK B., SABRI K., SAHAKIAN V., SALZMANN H., SASAKI M., SCHAFER J., SCHUSSLER F., SCHUTTE H.M., SENNIAPPAN M., SHAPOPI J.N.S., SHARMA A., SOL H., SPENCER S., STAWARZ L., STEENKAMP R., STEINMASSL S., STEPPA C., TAKAHASHI T., TANAKA T., TAYLOR A.M., TSIROU M., VAN ELDIK C., VECCHI M., VENTER C., VINK J., WACH T., WAGNER S.J., WIERZCHOLSKA A., ZACHARIAS M., ZDZIARSKI A.A., ZECH A., ZYWUCKA N. (The HESS Collaboration), ABE S., ABHIR J., ABHISHEK A., AGUASCA-CABOT A., AGUDO I., ANIELLO T., ANSOLDI S., ANTONELLI L.A., ARBET ENGELS A., ARCARO C., ARTERO M., ASANO K., BABIC A., BAKSHI C., BARRES DE ALMEIDA U., BARRIO J.A., BARRIOS-JIMENEZ L., BATKOVIC I., BAXTER J., BECERRA GONZALEZ J., BEDNAREK W., BERNARDINI E., BERNETE J., BERTI A., BESENRIEDER J., BIGONGIARI C., BILAND A., BLANCH O., BOKENKAMP H., BONNOLI G., BOSNJAK Z., BRONZINI E., BURELLI I., CAMPOY-ORDAZ A., CAROSI A., CAROSI R., CARRETERO-CASTRILLO M., CASTRO-TIRADO A.J., CERASOLE D., CERIBELLA G., CHAI Y., CHILINGARIAN A., CIFUENTES A., CONTRERAS J.L., CORTINA J., COVINO S., D'AMICO G., DA VELA P., DAZZI F., DE ANGELIS A., DE LOTTO B., DELFINO M., DELGADO MENDEZ C., DI PIERRO F., DI TRIA R., DI VENERE L., DINESH A., DOMINIS PRESTER D., DONINI A., DORNER D., DORO M., EISENBERGER L., ELSAESSER D., ESCUDERO J., FARINA L., FATTORINI A., FOFFANO L., FONT L., FROSE S., FUKAZAWA Y., GASPARYAN S., GAUG M., GIESBRECHT PAIVA J.G., GIGLIETTO N., GIORDANO F., GLIWNY P., GODINOVIC N., GRADETZKE T., GRAU R., GREEN D., GREEN J.G., GUNTHER P., HADASCH D., HAHN A., HASSAN T., HECKMANN L., HRUPEC D., IMAZAWA R., ISRAYELYAN D., JIMENEZ MARTINEZ I., JIMENEZ QUILES J., JORMANAINEN J., KANKKUNEN S., KAYANOKI T., KERSZBERG D., KONRAD J., KOUCH P.M., KUBO H., KUSHIDA J., LAINEZ M., LAMASTRA A., LINDFORS E., LOMBARDI S., LONGO F., LOPEZ-COTO R., LOPEZ-MOYA M., LOPEZ-ORAMAS A., LOPORCHIO S., LULIC L., LYARD E., MAJUMDAR P., MAKARIEV M., MALLAMACI M., MANEVA G., MANGANARO M., MANGANO S., MARCHESI S., MARIOTTI M., MARTINEZ M., MARUSEVEC P., MAS-AGUILAR A., MAZIN D., MENCHIARI S., MENDEZ GALLEGO J., MICELI D., MIRANDA J.M., MIRZOYAN R., MOLERO GONZALEZ M., MOLINA E., MONDAL H.A., MORALEJO A., NAKAMORI T., NANCI C., NEUSTROEV V., NIEVAS ROSILLO M., NIGRO C., NIKOLIC L., NILSSON K., NISHIJIMA K., NODA K., NOZAKI S., OKUMURA A., OTERO-SANTOS J., PAIANO S., PANEQUE D., PAREDES J.M., PERESANO M., PERSIC M., PIHET M., PODOBNIK F., PRADA MORONI P.G., PRANDINI E., RIBO M., RICO J., SAITO T., SAKURAI S., SATALECKA K., SATURNI F.G., SCHMITZ K., SCHMUCKERMAIER F., SCHUBERT J.L., SCIACCALUGA A., SILVESTRI G., SITAREK J., SLIUSAR V., SOBCZYNSKA D., STAMERRA A., STRISKOVIC J., STROM D., STRZYS M., SUDA Y., TAJIMA H., TAKAHASHI M., TAKEISHI R., TEMNIKOV P., TERAUCHI K., TERZIC T., TUTONE A., UBACH S., VAN SCHERPENBERG J., VAZQUEZ ACOSTA M., VENTURA S., VERNA G., VIALE I., VIGLIANO A., VIGORITO C.F., VISENTIN E., VITALE V., VOVK I., WALTER R., WERSIG F., WILL M., YAMAMOTO T., YEUNG P.K.H., YOO S. (The MAGIC Collaboration), ACHARYYA A., ARCHER A., BANGALE P., BARTKOSKE J.T., BENBOW W., BUCKLEY J.H., CHEN Y., CHRISTIANSEN J.L., CHROMEY A.J., ERRANDO M., FELDMAN S., FENG Q., FILBERT S., FORTSON L., FURNISS A., HANLON W., HERVET O., HINRICHS C.E., HOLDER J., HUGHES Z., HUMENSKY T.B., JIN W., JOHNSON M.N., KAARET P., KERTZMAN M., KHERLAKIAN M., KIEDA D., KLEINER T.K., KORZOUN N., LANG M.J., LUNDY M., MAIER G., MILLARD M.J., MILLIS J., MORIARTY P., MUKHERJEE R., NING W., ONG R.A., PANDEY A., POHL M., QUINN J., RABINOWITZ P.L., RAGAN K., REYNOLDS P.T., RIBEIRO D., ROACHE E., SADEH I., SADUN A.C., SAHA L., SANTANDER M., SEMBROSKI G.H., SHANG R., TAK D., TALLURI A.K., TUCCI J.V., VALVERDE J., VASSILIEV V.V., WILLIAMS D.A., WONG S.L. (The VERITAS Collaboration), BUSON S. (The Fermi-LAT Collaboration), ABBASI R., ACKERMANN M., ADAMS J., AGARWALLA S.K., AGUILAR J.A., AHLERS M., ALAMEDDINE J.M., ALI S., AMIN N.M., ANDEEN K., ARGUELLES C., ASHIDA Y., ATHANASIADOU S., AXANI S.N., BABU R., BAI X., BAINES-HOLMES J., BALAGOPAL V.A., BARWICK S.W., BASH S., BASU V., BAY R., BEATTY J.J., BECKER TJUS J., BEHRENS P., BEISE J., BELLENGHI C., BENKEL B., BENZVI S., BERLEY D., BERNARDINI E., BESSON D.Z., BLAUFUSS E., BLOOM L., BLOT S., BODO I., BONTEMPO F., BOOK MOTZKIN J.Y., BOSCOLO MENEGUOLO C., BOSER S., BOTNER O., BOTTCHER J., BRAUN J., BRINSON B., BRISSON-TSAVOUSSIS Z., BURLEY R.T., BUTTERFIELD D., CAMPANA M.A., CARLONI K., CARPIO J., CHATTOPADHYAY S., CHAU N., CHEN Z., CHIRKIN D., CHOI S., CLARK B.A., COLEMAN A., COLEMAN P., COLLIN G.H., COLOMA BORJA D.A., CONNOLLY A., CONRAD J.M., COWEN D.F., DE CLERCQ C., DELAUNAY J.J., DELGADO D., DELMEULLE T., DENG S., DESIATI P., DE VRIES K.D., DE WASSEIGE G., DEYOUNG T., DIAZ-VELEZ J.C., DIKERBY S., DING T., DITTMER M., DOMI A., DRAPER L., DUESER L., DURNFORD D., DUTTA K., DUVERNOIS M.A., EHRHARDT T., EIDENSCHINK L., EIMER A., ELLER P., ELLINGER E., ELSASSER D., ENGEL R., ERPENBECK H., ESMAIL W., EULIG S., EVANS J., EVENSON P.A., FAN K.L., FANG K., FARRAG K., FAZELY A.R., FEDYNITCH A., FEIGL N., FINLEY C., FISCHER L., FOX D., FRANCKOWIAK A., FUKAMI S., FURST P., GALLAGHER J., GANSTER E., GARCIA A., GARCIA M., GARG G., GENTON E., GERHARDT L., GHADIMI A., GLASER C., GLUSENKAMP T., GONZALEZ J.G., GOSWAMI S., GRANADOS A., GRANT D., GRAY S.J., GRIFFIN S., GRISWOLD S., GROTH K.M., GUEVEL D., GUNTHER C., GUTJAHR P., HA C., HAACK C., HALLGREN A., HALVE L., HALZEN F., HAMACHER L., HA MINH M., HANDT M., HANSON K., HARDIN J., HARNISCH A.A., HATCH P., HAUNGS A., HAUSSLER J., HELBING K., HELLRUNG J., HENKE B., HENNIG L., HENNINGSEN F., HEUERMANN L., HEWETT R., HEYER N., HICKFORD S., HIDVEGI A., HILL C., HILL G.C., HMAID R., HOFFMAN K.D., HOOPER D., HORI S., HOSHINA K., HOSTERT M., HOU W., HRYWNIAK M., HUBER T., HULTQVIST K., HYMON K., ISHIHARA A., IWAKIRI W., JACQUART M., JAIN S., JANIK O., JANSSON M., JEONG M., JIN M., KAMP N., KANG D., KANG W., KANG X., KAPPES A., KARDUM L., KARG T., KARL M., KARLE A., KATIL A., KAUER M., KELLEY J.L., KHANAL M., KHATEE ZATHUL A., KHEIRANDISH A., KIMKU H., KIRYLUK J., KLEIN C., KLEIN S.R., KOBAYASHI Y., KOCHOCKI A., KOIRALA R., KOLANOSKI H., KONTRIMAS T., KOPKE L., KOPPER C., KOSKINEN D.J., KOUNDAL P., KOWALSKI M., KOZYNETS T., KRAVKA A., KRIEGER N., KRISHNAMOORTHI J., KRISHNAN T., KRUISWIJK K., KRUPCZAK E., KUMAR A., KUN E., KURAHASHI N., LAD N., LAGUNAS GUALDA C., LALLEMENT ARNAUD L., LAMOUREUX M., LARSON M.J., LAUBER F., LAZAR J.P., LEONARD DEHOLTON K., LESZCZYNSKA A., LIAO J., LIN C., LIU Y.T., LIUBARSKA M., LOVE C., LU L., LUCARELLI F., LUSZCZAK W., LYU Y., MACDONALD M., MADSEN J., MAGNUS E., MAKINO Y., MANAO E., MANCINA S., MAND A., MARIS I.C., MARKA S., MARKA Z., MARTEN L., MARTINEZ-SOLER I., MARUYAMA R., MAURO J., MAYHEW F., McNALLY F., MEAD J.V., MEAGHER K., MECHBAL S., MEDINA A., MEIER M., MERCKX Y., MERTEN L., MITCHELL J., MOLCHANY L., MONDAL S., MONTARULI T., MOORE R.W., MORII Y., MOSBRUGGER A., MOULAI M., MOUSADI D., MOYAUX E., MUKHERJEE T., NAAB R., NAKOS M., NAUMANN U., NECKER J., NESTE L., NEUMANN M., NIEDERHAUSEN H., NISA M.U., NODA K., NOELL A., NOVIKOV A., OBERTACKE A., O'DELL V., OLIVAS A., ORSOE R., OSBORN J., O'SULLIVAN E., PALUSOVA V., PANDYA H., PARENTI A., PARK N., PARRISH V., PAUDEL E.N., PAUL L., PEREZ DE LOS HEROS C., PERNICE T., PETERSEN T.C., PETERSON J., PLUM M., PONTEN A., POOJYAM V., POPOVYCH Y., PRADO RODRIGUEZ M., PRIES B., PROCTER-MURPHY R., PRZYBYLSKI G.T., PYRAS L., RAAB C., RACK-HELLEIS J., RAD N., RAVN M., RAWLINS K., RECHAV Z., REHMAN A., REISTROFFER I., RESCONI E., REUSCH S., RHO C.D., RHODE W., RICCA L., RIEDEL B., RIFAIE A., ROBERTS E.J., RONGEN M., ROSTED A., ROTT C., RUHE T., RUOHAN L., RYCKBOSCH D., SAFFER J., SALAZAR-GALLEGOS D., SAMPATHKUMAR P., SANDROCK A., SANGER-JOHNSON G., SANTANDER M., SARKAR S., SAVELBERG J., SCARNERA M., SCHAILE P., SCHAUFEL M., SCHIELER H., SCHINDLER S., SCHLICKMANN L., SCHLUTER B., SCHLUTER F., SCHMEISSER N., SCHMIDT T., SCHRODER F.G., SCHUMACHER L., SCHWIRN S., SCLAFANI S., SECKEL D., SEEN L., SEIKH M., SEUNARINE S., SEVLE MYHR P.A., SHAH R., SHEFALI S., SHIMIZU N., SKRZYPEK B., SNIHUR R., SOEDINGREKSO J., SEGAARD A., SOLDIN D., SOLDIN P., SOMMANI G., SPANNFELLNER C., SPICZAK G.M., SPIERING C., STACHURSKA J., STAMATIKOS M., STANEV T., STEZELBERGER T., STURWALD T., STUTTARD T., SULLIVAN G.W., TABOADA I., TER-ANTONYAN S., TERLIUK A., THAKURI A., THIESMEYER M., THOMPSON W.G., THWAITES J., TILAV S., TOLLEFSON K., TOSCANO S., TOSI D., TRETTIN A., UPADHYAY A.K., UPSHAW K., VAIDYANATHAN A., VALTONEN-MATTILA N., VALVERDE J., VANDENBROUCKE J., VAN EEDEN T., VAN EIJNDHOVEN N., VAN ROOTSELAAR L., VAN SANTEN J., VARA J., VARSI F., VENUGOPAL M., VEREECKEN M., VERGARA CARRASCO S., VERPOEST S., VESKE D., VIJAI A., VILLARREAL J., WALCK C., WANG A., WARRICK E.H.S., WEAVER C., WEIGEL P., WEINDL A., WELDERT J., WEN A.Y., WENDT C., WERTHEBACH J., WEYRAUCH M., WHITEHORN N., WIEBUSCH C.H., WILLIAMS D.R., WITTHAUS L., WOLF M., WREDE G., XU X.W., YANEZ J.P., YAO Y., YILDIZCI E., YOSHIDA S., YOUNG R., YU F., YU S., YUAN T., ZANDER JUROWITZKI A., ZEGARELLI A., ZHANG S., ZHANG Z., ZHELNIN P., ZILBERMAN P., D'AMMANDO F. (The IceCube Collaboration)

Abstract (from CDS):

The search for sources of high-energy astrophysical neutrinos can be significantly advanced through a multimessenger approach, which seeks to detect the γ-rays that accompany neutrinos as they are produced at their sources. Multimessenger observations have so far provided the first evidence for a neutrino source, illustrated by the joint detection of the flaring blazar TXS 0506+056 in high-energy (E > 1 GeV) and very-high-energy (VHE; E > 100 GeV) γ-rays in coincidence with the high-energy neutrino IceCube-170922A, identified by IceCube. Imaging atmospheric Cherenkov telescopes (IACTs), namely FACT, H.E.S.S., MAGIC, and VERITAS, continue to conduct extensive neutrino target-of-opportunity follow-up programs. These programs have two components: follow-up observations of single astrophysical neutrino candidate events (such as IceCube-170922A), and observation of known γ-ray sources after the identification of a cluster of neutrino events by IceCube. Here we present a comprehensive analysis of follow-up observations of high-energy neutrino events observed by the four IACTs between 2017 September (after the IceCube-170922A event) and 2021 January. Our study found no associations between γ-ray sources and the observed neutrino events. We provide a detailed overview of each neutrino event and its potential counterparts. Furthermore, a joint analysis of all IACT data is included, yielding combined upper limits on the VHE γ-ray flux.

Abstract Copyright: © 2026. The Author(s). Published by the American Astronomical Society.

Journal keyword(s): Particle astrophysics - High energy astrophysics - Gamma-rays - Cosmological neutrinos

Simbad objects: 30

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Number of rows : 30
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026
#notes
1 IceCube-190922B ev 00 19.2 -01 55           ~ 10 0
2 AT 2019pqh SN? 00 26 28.291 -01 07 53.37           ~ 4 0
3 6C 013354+473615 Bla 01 36 58.59480326 +47 51 29.1000720     19.50 19.25 15.21 ~ 537 1
4 M 77 Sy2 02 42 40.7091669408 -00 00 47.859690204 9.70 9.61 8.87 10.1 9.9 ~ 4897 2
5 RX J0316.1+0904 BLL 03 16 12.7326021672 +09 04 43.281750684       17.2   ~ 73 1
6 PMN J0325-1843 rG 03 25 54.5868398077 -18 44 11.637547898           ~ 7 1
7 PMN J0509+0541 BLL 05 09 25.9644373872 +05 41 35.333820420 15.32 14.95 14.78 15.12   ~ 589 2
8 M 1 SNR 05 34 31.8 +22 01 03           ~ 6516 1
9 IceCube-200926A ev 06 25.8 -05 05           ~ 18 0
10 IceCube-201114A ev 06 57.8 +06 23           ~ 33 0
11 NVSS J065844+063711 BLL 06 58 45.0238915922 +06 37 11.484056767           ~ 49 1
12 IceCube-190503A ev 08 01.1 +06 21           ~ 18 0
13 RX J0955.1+3550 BLL 09 55 07.8818398488 +35 51 00.885435048   21.04 20.36 19.1   ~ 68 0
14 IceCube-200107A ev 09 55 07.90 +35 51 00.9           ~ 30 0
15 Z 184-50 BLL 11 04 27.3140835504 +38 12 31.798495872   13.50 12.90 8.31   ~ 2841 1
16 GrW 170817 GWE 13 09 48.0850 -23 22 53.343           ~ 2683 0
17 US 371 BLL 13 10 28.66385420 +32 20 43.7828340   15.61 15.24 17.91   ~ 917 1
18 RX J1315.0-4236 BLL 13 15 03.3912307368 -42 36 49.760844084   18.07   16.59   ~ 114 0
19 NAME Centaurus A BLL 13 25 27.61521044 -43 01 08.8050291   8.18 6.84 6.66   ~ 4774 3
20 IceCube-201222A ev 13 47.6 +13 16           ~ 16 0
21 QSO B1502+1041 Bla 15 04 24.97978391 +10 29 39.1985309   18.97 18.56 18.94   ~ 634 1
22 IceCube-201007A ev 17 40.7 +05 09           ~ 17 0
23 IceCube-181023A ev 18 00.7 -08 34           ~ 11 0
24 BWE 1816+0902 Bla 18 18 40.0616593848 +09 03 46.230992640   19.0 19.5 18.5   ~ 57 1
25 PMN J2016-0903 BLL 20 16 24.0367778290 -09 03 33.467036321           ~ 55 1
26 IceCube-191001A ev 20 56.3 +12 56           ~ 37 0
27 2MASX J20570298+1412165 G 20 57 02.9650698480 +14 12 16.295014080           ~ 162 0
28 ICRF J223810.3+072413 Bla 22 38 10.3960007784 +07 24 13.989950352       18.12   ~ 36 1
29 IceCube-171106A ev 22 40 +07.4           ~ 17 0
30 IceCube-190529A ev ~ ~           ~ 3 0

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