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Rosse Telescope

Garret Cotter

Professor of Physics

Research theme

  • Astronomy and astrophysics
  • Particle astrophysics & cosmology

Sub department

  • Astrophysics

Research groups

  • Pulsars, transients and relativistic astrophysics
  • The Square Kilometre Array (SKA)
  • Gamma-ray astronomy
Garret.Cotter@physics.ox.ac.uk
Telephone: 01865 (2)73604
Denys Wilkinson Building, room Dalitz 4
  • About
  • Publications

DIPLODOCUS I: Framework for the evaluation of relativistic transport equations with continuous forcing and discrete particle interactions

The Open Journal of Astrophysics Maynooth University 9 (2026)

Authors:

Christopher N Everett, Garret Cotter

Abstract:

DIPLODOCUS (Distribution-In-PLateaux methODOlogy for the CompUtation of transport equationS) is a novel framework being developed for the mesoscopic modelling of astrophysical systems via the transport of particle distribution functions through the seven dimensions of phase space, including continuous forces and discrete interactions between particles. This first paper in a series provides an overview of the analytical framework behind the model, consisting of an integral formulation of the relativistic transport equations (Boltzmann equations) and a discretisation procedure for the particle distribution function (Distribution-In-Plateaux). The latter allows for the evaluation of anisotropic interactions, and generates a conservative numerical scheme for a distribution function’s transport through phase space.
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DIPLODOCUS I: Framework for the evaluation of relativistic transport equations with continuous forcing and discrete particle interactions

(2026)

Authors:

Christopher N Everett, Garret Cotter
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Prompt Searches for Very-high-energy γ -Ray Counterparts to IceCube Astrophysical Neutrino Alerts

The Astrophysical Journal American Astronomical Society 997:2 (2026) 141

Authors:

J Abhir, A Biland, K Brand, T Bretz, D Dorner, L Eisenberger, D Elsaesser, P Günther, S Hasan, D Hildebrand, K Mannheim, M Linhoff, F Pfeifle, W Rhode, B Schleicher, V Sliusar, M Vorbrugg, R Walter, F Aharonian, F Ait Benkhali, J Aschersleben, H Ashkar, M Backes, A Brown, G Cotter

Abstract:

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.
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Prompt Searches for Very-High-Energy γ-Ray Counterparts to IceCube Astrophysical Neutrino Alerts

(2025)

Authors:

J Abhir, A Biland, K Brand, T Bretz, D Dorner, L Eisenberger, D Elsaesser, P Günther, S Hasan, D Hildebrand, K Mannheim, M Linhoff, F Pfeifle, W Rhode, B Schleicher, V Sliusar, M Vorbrugg, R Walter, F Aharonian, F Ait Benkhali, J Aschersleben, H Ashkar, M Backes, V Barbosa Martins, R Batzofin, Y Becherini, D Berge, M Böttcher, C Boisson, J Bolmont, J Borowska, R Brose, A Brown, F Brun, B Bruno, S Casanova, J Celic, M Cerruti, A Chen, M Chernyakova, J Chibueze, O Chibueze, B Cornejo, G Cotter, G Cozzolongo, J Damascene Mbarubucyeye, J de Assis Scarpin, A Delgado Giles, A Djannati-Ataï, J Djuvsland, A Dmytriiev, K Egberts, K Egg, S Einecke, J-P Ernenwein, C Escañ, K Feijen, M Filipovic, G Fontaine, S Funk, S Gabici, JF Glicenstein, P Goswami, G Grolleron, B Heß, JA Hinton, M Holler, M Jamrozy, F Jankowsky, I Jung-Richardt, E Kasai, K Katarzyń, H Katjaita, D Kerszberg, R Khatoon, B Khélifi, W Kluź, Nu Komin, R Konno, K Kosack, D Kostunin, G Kukec Mezek, RG Lang, A Lemière, M Lemoine-Goumard, J-P Lenain, A Luashvili, J Mackey, V Marandon, G Martí-Devesa, R Marx, M Mayer, A Mehta, A Mitchell, R Moderski, MO Moghadam, L Mohrmann, E Moulin, M de Naurois, J Niemiec, E de Ona Wilhelmi, S Panny, M Panter, RD Parsons, U Pensec, P Pichard, G Pühlhofer, M Punch, A Quirrenbach, M Regeard, O Reimer, H Ren, F Rieger, G Rowell, B Rudak, K Sabri, V Sahakian, H Salzmann, M Sasaki, J Schäfer, F Schüssler, HM Schutte, M Senniappan, JNS Shapopi, A Sharma, H Sol, S Spencer, Ł., R Steenkamp, S Steinmassl, C Steppa, T Takahashi, T Tanaka, AM Taylor, M Tsirou, C van Eldik, M Vecchi, C Venter, J Vink, T Wach, SJ Wagner, A Wierzcholska, M Zacharias, AA Zdziarski, A Zech, N Żywucka, S Abe, J Abhir, A Abhishek, A Aguasca-Cabot, I Agudo, T Aniello, S Ansoldi, LA Antonelli, A Arbet Engels, C Arcaro, M Artero, K Asano, A Babić, C Bakshi, U Barres de Almeida, JA Barrio, L Barrios-Jiménez, I Batković, J Baxter, J Becerra González, W Bednarek, E Bernardini, J Bernete, A Berti, J Besenrieder, C Bigongiari, A Biland, O Blanch, H Bökenkamp, G Bonnoli, Ž, E Bronzini, I Burelli, A Campoy-Ordaz, A Carosi, R Carosi, M Carretero-Castrillo, AJ Castro-Tirado, D Cerasole, G Ceribella, Y Chai, A Chilingarian, A Cifuentes, JL Contreras, J Cortina, S Covino, G D'Amico, P Da Vela, F Dazzi, A De Angelis, B De Lotto, M Delfino, C Delgado Mendez, F Di Pierro, R Di Tria, L Di Venere, A Dinesh, D Dominis Prester, A Donini, D Dorner, M Doro, L Eisenberger, D Elsaesser, J Escudero, L Fariña, A Fattorini, L Foffano, L Font, S Fröse, Y Fukazawa, S Gasparyan, M Gaug, JG Giesbrecht Paiva, N Giglietto, F Giordano, P Gliwny, N Godinović, T Gradetzke, R Grau, D Green, JG Green, P Günther, D Hadasch, A Hahn, T Hassan, L Heckmann, D Hrupec, R Imazawa, D Israyelyan, I Jiménez Martínez, J Jiménez Quiles, J Jormanainen, S Kankkunen, T Kayanoki, D Kerszberg, J Konrad, PM Kouch, H Kubo, J Kushida, M Láinez, A Lamastra, E Lindfors, S Lombardi, F Longo, R López-Coto, M López-Moya, A López-Oramas, S Loporchio, L Lulić, E Lyard, P Majumdar, M Makariev, M Mallamaci, G Maneva, M Manganaro, S Mangano, S Marchesi, M Mariotti, M Martínez, P Maruš, A Mas-Aguilar, D Mazin, S Menchiari, J Méndez Gallego, D Miceli, JM Miranda, R Mirzoyan, M Molero González, E Molina, HA Mondal, A Moralejo, T Nakamori, C Nanci, V Neustroev, M Nievas Rosillo, C Nigro, L Nikolić, K Nilsson, K Nishijima, K Noda, S Nozaki, A Okumura, J Otero-Santos, S Paiano, D Paneque, JM Paredes, M Peresano, M Persic, M Pihet, F Podobnik, PG Prada Moroni, E Prandini, M Ribó, J Rico, T Saito, S Sakurai, K Satalecka, FG Saturni, K Schmitz, F Schmuckermaier, JL Schubert, A Sciaccaluga, G Silvestri, J Sitarek, V Sliusar, D Sobczynska, A Stamerra, J Striš, D Strom, M Strzys, Y Suda, H Tajima, M Takahashi, R Takeishi, P Temnikov, K Terauchi, T Terzić, A Tutone, S Ubach, J van Scherpenberg, M Vazquez Acosta, S Ventura, G Verna, I Viale, A Vigliano, CF Vigorito, E Visentin, V Vitale, I Vovk, R Walter, F Wersig, M Will, T Yamamoto, PKH Yeung, S Yoo, A Acharyya, A Archer, P Bangale, JT Bartkoske, W Benbow, JH Buckley, Y Chen, JL Christiansen, AJ Chromey, M Errando, S Feldman, Q Feng, S Filbert, L Fortson, A Furniss, W Hanlon, O Hervet, CE Hinrichs, J Holder, Z Hughes, TB Humensky, W Jin, MN Johnson, P Kaaret, M Kertzman, M Kherlakian, D Kieda, TK Kleiner, N Korzoun, MJ Lang, M Lundy, G Maier, MJ Millard, J Millis, P Moriarty, R Mukherjee, W Ning, RA Ong, A Pandey, M Pohl, J Quinn, PL Rabinowitz, K Ragan, PT Reynolds, D Ribeiro, E Roache, I Sadeh, AC Sadun, L Saha, M Santander, GH Sembroski, R Shang, D Tak, AK Talluri, JV Tucci, J Valverde, VV Vassiliev, DA Williams, SL Wong, S Buson, R Abbasi, M Ackermann, J Adams, SK Agarwalla, JA Aguilar, M Ahlers, JM Alameddine, S Ali, NM Amin, K Andeen, C Argü, Y Ashida, S Athanasiadou, SN Axani, R Babu, X Bai, J Baines-Holmes, A Balagopal V., SW Barwick, S Bash, V Basu, R Bay, JJ Beatty, J Becker Tjus, P Behrens, J Beise, C Bellenghi, B Benkel, S BenZvi, D Berley, E Bernardini, DZ Besson, E Blaufuss, L Bloom, S Blot, I Bodo, F Bontempo, JY Book Motzkin, C Boscolo Meneguolo, S Bö, O Botner, J Bö, J Braun, B Brinson, Z Brisson-Tsavoussis, RT Burley, D Butterfield, MA Campana, K Carloni, J Carpio, S Chattopadhyay, N Chau, Z Chen, D Chirkin, S Choi, BA Clark, A Coleman, P Coleman, GH Collin, DA Coloma Borja, A Connolly, JM Conrad, DF Cowen, C De Clercq, JJ DeLaunay, D Delgado, T Delmeulle, S Deng, P Desiati, KD de Vries, G de Wasseige, T DeYoung, JC Dí, S DiKerby, T Ding, M Dittmer, A Domi, L Draper, L Dueser, D Durnford, K Dutta, MA DuVernois, T Ehrhardt, L Eidenschink, A Eimer, P Eller, E Ellinger, D Elsä, R Engel, H Erpenbeck, W Esmail, S Eulig, J Evans, PA Evenson, KL Fan, K Fang, K Farrag, AR Fazely, A Fedynitch, N Feigl, C Finley, L Fischer, D Fox, A Franckowiak, S Fukami, P Fü, J Gallagher, E Ganster, A Garcia, M Garcia, G Garg, E Genton, L Gerhardt, A Ghadimi, C Glaser, T Glü, JG Gonzalez, S Goswami, A Granados, D Grant, SJ Gray, S Griffin, S Griswold, KM Groth, D Guevel, C Gü, P Gutjahr, C Ha, C Haack, A Hallgren, L Halve, F Halzen, L Hamacher, M Ha Minh, M Handt, K Hanson, J Hardin, AA Harnisch, P Hatch, A Haungs, J Hä, K Helbing, J Hellrung, B Henke, L Hennig, F Henningsen, L Heuermann, R Hewett, N Heyer, S Hickford, A Hidvegi, C Hill, GC Hill, R Hmaid, KD Hoffman, D Hooper, S Hori, K Hoshina, M Hostert, W Hou, M Hrywniak, T Huber, K Hultqvist, K Hymon, A Ishihara, W Iwakiri, M Jacquart, S Jain, O Janik, M Jansson, M Jeong, M Jin, N Kamp, D Kang, W Kang, X Kang, A Kappes, L Kardum, T Karg, M Karl, A Karle, A Katil, M Kauer, JL Kelley, M Khanal, A Khatee Zathul, A Kheirandish, H Kimku, J Kiryluk, C Klein, SR Klein, Y Kobayashi, A Kochocki, R Koirala, H Kolanoski, T Kontrimas, L Kö, C Kopper, DJ Koskinen, P Koundal, M Kowalski, T Kozynets, A Kravka, N Krieger, J Krishnamoorthi, T Krishnan, K Kruiswijk, E Krupczak, A Kumar, E Kun, N Kurahashi, N Lad, C Lagunas Gualda, L Lallement Arnaud, M Lamoureux, MJ Larson, F Lauber, JP Lazar, K Leonard DeHolton, A Leszczyń, J Liao, C Lin, YT Liu, M Liubarska, C Love, L Lu, F Lucarelli, W Luszczak, Y Lyu, M Macdonald, J Madsen, E Magnus, Y Makino, E Manao, S Mancina, A Mand, IC Mariş, S Marka, Z Marka, L Marten, I Martinez-Soler, R Maruyama, J Mauro, F Mayhew, F McNally, JV Mead, K Meagher, S Mechbal, A Medina, M Meier, Y Merckx, L Merten, J Mitchell, L Molchany, S Mondal, T Montaruli, RW Moore, Y Morii, A Mosbrugger, M Moulai, D Mousadi, E Moyaux, T Mukherjee, R Naab, M Nakos, U Naumann, J Necker, L Neste, M Neumann, H Niederhausen, MU Nisa, K Noda, A Noell, A Novikov, A Obertacke, V O'Dell, A Olivas, R Orsoe, J Osborn, E O'Sullivan, V Palusova, H Pandya, A Parenti, N Park, V Parrish, EN Paudel, L Paul, C Pé, T Pernice, TC Petersen, J Peterson, M Plum, A Ponté, V Poojyam, Y Popovych, M Prado Rodriguez, B Pries, R Procter-Murphy, GT Przybylski, L Pyras, C Raab, J Rack-Helleis, N Rad, M Ravn, K Rawlins, Z Rechav, A Rehman, I Reistroffer, E Resconi, S Reusch, CD Rho, W Rhode, L Ricca, B Riedel, A Rifaie, EJ Roberts, M Rongen, A Rosted, C Rott, T Ruhe, L Ruohan, D Ryckbosch, J Saffer, D Salazar-Gallegos, P Sampathkumar, A Sandrock, G Sanger-Johnson, M Santander, S Sarkar, J Savelberg, M Scarnera, P Schaile, M Schaufel, H Schieler, S Schindler, L Schlickmann, B Schlü, F Schlü, N Schmeisser, T Schmidt, FG Schrö, L Schumacher, S Schwirn, S Sclafani, D Seckel, L Seen, M Seikh, S Seunarine, PA Sevle Myhr, R Shah, S Shefali, N Shimizu, B Skrzypek, R Snihur, J Soedingrekso, A Sø, D Soldin, P Soldin, G Sommani, C Spannfellner, GM Spiczak, C Spiering, J Stachurska, M Stamatikos, T Stanev, T Stezelberger, T Stü, T Stuttard, GW Sullivan, I Taboada, S Ter-Antonyan, A Terliuk, A Thakuri, M Thiesmeyer, WG Thompson, J Thwaites, S Tilav, K Tollefson, S Toscano, D Tosi, A Trettin, AK Upadhyay, K Upshaw, A Vaidyanathan, N Valtonen-Mattila, J Valverde, J Vandenbroucke, T Van Eeden, N van Eijndhoven, L Van Rootselaar, J van Santen, J Vara, F Varsi, M Venugopal, M Vereecken, S Vergara Carrasco, S Verpoest, D Veske, A Vijai, J Villarreal, C Walck, A Wang, EHS Warrick, C Weaver, P Weigel, A Weindl, J Weldert, AY Wen, C Wendt, J Werthebach, M Weyrauch, N Whitehorn, CH Wiebusch, DR Williams, L Witthaus, M Wolf, G Wrede, XW Xu, JP Yanez, Y Yao, E Yildizci, S Yoshida, R Young, F Yu, S Yu, T Yuan, A Zander Jurowitzki, A Zegarelli, S Zhang, Z Zhang, P Zhelnin, P Zilberman, F D'Ammando
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SALT and VLT spectroscopy of the VHE flat-spectrum radio quasar PKS 0903–57

Sissa Medialab Srl (2025) 033

Authors:

Eli Kasai, Paolo Goldoni, Catherine Boisson, Santiago Pita, Filippo D'Ammando, Walter Max-Moerbeck, Michael Backes, Garret Cotter
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