Pulsars, transients and relativistic astrophysics

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Unprecedentedly bright X-ray flaring in Cygnus X-1 observed by INTEGRAL

ArXiv 2508.20874 (2025)

Authors:

P Thalhammer, T Bouchet, J Rodriguez, F Cangemi, K Pottschmidt, DA Green, L Rhodes, C Ferrigno, MA Nowak, V Grinberg, T Siegert, P Laurent, I Kreykenbohm, M Perucho, J Tomsick, C Sánchez-Fernández, J Wilms C Sánchez-Fernández, J Wilms
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Combined dark matter search towards dwarf spheroidal galaxies with Fermi-LAT, HAWC, H.E.S.S., MAGIC, and VERITAS

(2025)

Authors:

LAT Collaboration, S Abdollahi, L Baldini, R Bellazzini, B Berenji, E Bissaldi, R Bonino, P Bruel, S Buson, E Charles, AW Chen, S Ciprini, M Crnogorcevic, A Cuoco, F D'Ammando, A de Angelis, M Di Mauro, N Di Lalla, L Di Venere, A Domínguez, SJ Fegan, A Fiori, P Fusco, V Gammaldi, F Gargano, D Gasparrini, F Giacchino, N Giglietto, M Giliberti, F Giordano, M Giroletti, IA Grenier, S Guiriec, M Gustafsson, E Hays, JW Hewitt, D Horan, H Katagiri, M Kuss, J Li, F Longo, F Loparco, L Lorusso, G Martí-Devesa, MN Mazziotta, JE McEnery, I Mereu, M Meyer, PF Michelson, N Mirabal, W Mitthumsiri, T Mizuno, A Morselli, IV Moskalenko, M Negro, N Omodei, M Orienti, E Orlando, G Panzarini, M Persic, M Pesce-Rollins, R Pillera, TA Porter, G Principe, S Rainò, R Rando, M Razzano, O Reimer, M Sánchez-Conde, PM Saz Parkinson, D Serini, DJ Suson, DF Torres, G Zaharijas, HAWC Collaboration, :, A Albert, R Alfaro, C Alvarez, JC Arteaga-Velázquez, D Avila Rojas, HA Ayala Solares, R Babu, E Belmont-Moreno, KS Caballero-Mora, T Capistrán, A Carramiñana, S Casanova, O Chaparro-Amaro, U Cotti, J Cotzomi, S Coutiño de León, E de la Fuente, C de León, R Diaz Hernandez, BL Dingus, MA DuVernois, M Durocher, JC Díaz-Vélez, K Engel, C Espinoza, KL Fan, N Fraija, JA García-González, F Garfias, MM González, JA Goodman, JP Harding, S Hernandez, I Herzog, J Hinton, D Huang, F Hueyotl-Zahuantitla, P Hüntemeyer, A Iriarte, V Joshi, S Kaufmann, D Kieda, GJ Kunde, A Lara, J Lee, H León Vargas, JT Linnemann, AL Longinotti, G Luis-Raya, J Lundeen, K Malone, O Martinez, J Martínez-Castro, H Martínez-Huerta, JA Matthews, P Miranda-Romagnoli, JA Morales-Soto, E Moreno, M Mostafá, A Nayerhoda, L Nellen, MU Nisa, R Noriega-Papaqui, L Olivera-Nieto, N Omodei, A Peisker, Y Pérez Araujo, EG Pérez-Pérez, CD Rho, D Rosa-González, H Salazar, D Salazar-Gallegos, A Sandoval, M Schneider, J Serna-Franco, AJ Smith, Y Son, RW Springer, O Tibolla, K Tollefson, I Torres, R Torres-Escobedo, R Turner, F Ureña-Mena, E Varela, L Villaseñor, X Wang, IJ Watson, K Whitaker, E Willox, S Yu, S Yun-Cárcamo, H Zhou, HESS Collaboration, :, F Aharonian, F Ait Benkhali, C Armand, J Aschersleben, M Backes, V Barbosa Martins, R Batzofin, Y Becherini, D Berge, B Bi, M Böttcher, C Boisson, J Bolmont, M de Bony de Lavergne, J Borowska, M Bouyahiaoui, F Bradascio, M Breuhaus, F Brun, B Bruno, T Bulik, C Burger-Scheidlin, S Caroff, S Casanova, R Cecil, J Celic, M Cerruti, T Chand, S Chandra, A Chen, J Chibueze, O Chibueze, G Cotter, S Dai, J Damascene Mbarubucyeye, A Dmytriiev, V Doroshenko, J-P Ernenwein, G Fichet de Clairfontaine, M Filipovic, G Fontaine, M Füßling, S Funk, S Gabici, S Ghafourizadeh, G Giavitto, D Glawion, JF Glicenstein, G Grolleron, L Haerer, JA Hinton, W Hofmann, TL Holch, M Holler, D Horns, M Jamrozy, F Jankowsky, A Jardin-Blicq, V Joshi, I Jung-Richardt, E Kasai, K Katarzyński, R Khatoon, B Khélifi, W Kluźniak, Nu Komin, D Kostunin, RG Lang, S Le Stum, F Leitl, A Lemière, M Lemoine-Goumard, J-P Lenain, F Leuschner, T Lohse, A Luashvili, I Lypova, J Mackey, D Malyshev, D Malyshev, V Marandon, P Marchegiani, R Marx, M Meyer, A Mitchell, R Moderski, A Montanari, E Moulin, K Nakashima, M de Naurois, J Niemiec, A Priyana Noel, L Oakes, P O'Brien, S Ohm, L Olivera-Nieto, E de Ona Wilhelmi, M Ostrowski, S Panny, M Panter, RD Parsons, V Poireau, DA Prokhorov, G Pühlhofer, A Quirrenbach, P Reichherzer, A Reimer, O Reimer, F Rieger, L Rinchiuso, G Rowell, B Rudak, V Sahakian, S Sailer, A Santangelo, M Sasaki, J Schäfer, U Schwanke, JNS Shapopi, H Sol, A Specovius, S Spencer, Ł Stawarz, R Steenkamp, S Steinmassl, C Steppa, I Sushch, H Suzuki, T Takahashi, T Tanaka, T Tavernier, AM Taylor, R Terrier, C Thorpe-Morgan, C van Eldik, M Vecchi, J Veh, C Venter, J Vink, T Wach, SJ Wagner, A Wierzcholska, Yu Wun Wong, M Zacharias, D Zargaryan, AA Zdziarski, A Zech, S Zouari, N Żywucka, MAGIC Collaboration, :, H Abe, S Abe, VA Acciari, I Agudo, T Aniello, S Ansoldi, LA Antonelli, A Arbet Engels, C Arcaro, M Artero, K Asano, D Baack, A Babić, A Baquero, U Barres de Almeida, JA Barrio, I Batković, J Baxter, J Becerra González, W Bednarek, E Bernardini, M Bernardos, J Bernete, A Berti, C Bigongiari, A Biland, O Blanch, G Bonnoli, Ž Bošnjak, I Burelli, G Busetto, A Campoy Ordaz, A Carosi, R Carosi, M Carretero-Castrillo, AJ Castro-Tirado, G Ceribella, Y Chai, A Cifuentes, S Cikota, E Colombo, JL Contreras, J Cortina, S Covino, G D'Amico, V D'Elia, P Da Vela, F Dazzi, A De Angelis, B De Lotto, A Del Popolo, M Delfino, J Delgado, C Delgado Mendez, D Depaoli, F Di Pierro, L Di Venere, D Dominis Prester, A Donini, D Dorner, M Doro, D Elsaesser, G Emery, J Escudero, L Fariña, A Fattorini, L Foffano, L Font, S Fröse, S Fukami, Y Fukazawa, RJ García López, M Garczarczyk, S Gasparyan, M Gaug, JG Giesbrecht Paiva, N Giglietto, F Giordano, P Gliwny, N Godinović, R Grau, D Green, JG Green, D Hadasch, A Hahn, T Hassan, L Heckmann, J Herrera, D Hrupec, M Hütten, R Imazawa, T Inada, R Iotov, K Ishio, I Jiménez Martínez, J Jormanainen, D Kerszberg, GW Kluge, Y Kobayashi, PM Kouch, H Kubo, J Kushida, M Láinez Lezáun, A Lamastra, F Leone, E Lindfors, S Lombardi, F Longo, R López-Coto, M López-Moya, A López-Oramas, S Loporchio, A Lorini, B Machado de Oliveira Fraga, P Majumdar, M Makariev, G Maneva, N Mang, M Manganaro, S Mangano, K Mannheim, M Mariotti, M Martínez, A Mas-Aguilar, D Mazin, S Menchiari, S Mender, D Miceli, T Miener, JM Miranda, R Mirzoyan, M Molero González, E Molina, HA Mondal, A Moralejo, D Morcuende, C Nanci, V Neustroev, M Nievas Rosillo, C Nigro, K Nilsson, K Nishijima, T Njoh Ekoume, K Noda, S Nozaki, Y Ohtani, A Okumura, J Otero-Santos, S Paiano, M Palatiello, D Paneque, R Paoletti, JM Paredes, L Pavletić, M Persic, M Pihet, G Pirola, F Podobnik, PG Prada Moroni, E Prandini, G Principe, C Priyadarshi, W Rhode, M Ribó, J Rico, C Righi, N Sahakyan, T Saito, K Satalecka, FG Saturni, B Schleicher, K Schmidt, F Schmuckermaier, JL Schubert, T Schweizer, A Sciaccaluga, J Sitarek, V Sliusar, D Sobczynska, A Spolon, A Stamerra, J Strišković, D Strom, M Strzys, Y Suda, S Suutarinen, H Tajima, M Takahashi, R Takeishi, F Tavecchio, P Temnikov, K Terauchi, T Terzić, M Teshima, L Tosti, S Truzzi, A Tutone, S Ubach, J van Scherpenberg, M Vazquez Acosta, S Ventura, V Verguilov, I Viale, CF Vigorito, V Vitale, I Vovk, R Walter, M Will, C Wunderlich, T Yamamoto, VERITAS Collaboration, :, A Acharyya, CB Adams, A Archer, P Bangale, JT Bartkoske, P Batista, W Benbow, JH Buckley, Y Chen, JL Christiansen, AJ Chromey, M Errando, M Escobar Godoy, A Falcone, S Feldman, Q Feng, JP Finley, GM Foote, L Fortson, A Furniss, G Gallagher, C Giuri, W Hanlon, O Hervet, CE Hinrichs, J Hoang, J Holder, Z Hughes, TB Humensky, W Jin, MN Johnson, P Kaaret, M Kertzman, M Kherlakian, D Kieda, TK Kleiner, N Korzoun, F Krennrich, S Kumar, M Lundy, G Maier, CE McGrath, MJ Millard, J Millis, CL Mooney, P Moriarty, R Mukherjee, D Nieto, S O'Brien, RA Ong, M Pohl, E Pueschel, J Quinn, PL Rabinowitz, K Ragan, PT Reynolds, D Ribeiro, E Roache, JL Ryan, I Sadeh, L Saha, M Santander, GH Sembroski, R Shang, M Splettstoesser, D Tak, AK Talluri, JV Tucci, VV Vassiliev, A Weinstein, DA Williams, SL Wong
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Testing and Combining Transient Spectral Classification Tools on 4MOST-like Blended Spectra

(2025)

Authors:

Andrew Milligan, Isobel Hook, Christopher Frohmaier, Mathew Smith, Georgios Dimitriadis, Young-Lo Kim, Kate Maguire, Anais Möller, Matt Nicholl, Stephen J Smartt, Jesper Storm, Mark Sullivan, Elmo Tempel, Philip Wiseman, Letizia P CassarÃ, Ricardo Demarco, Alexander Fritz, Jiachen Jiang
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The radio flare and multi-wavelength afterglow of the short GRB 231117A: energy injection from a violent shell collision

ArXiv 2508.1465 (2025)

Authors:

GE Anderson, GP Lamb, BP Gompertz, L Rhodes, A Martin-Carrillo, AJ van der Horst, A Rowlinson, ME Bell, T-W Chen, HM Fausey, M Ferro, PJ Hancock, SR Oates, S Schulze, RLC Starling, S Yang, K Ackley, JP Anderson, A Andersson, JF Agüí Fernández, R Brivio, E Burns, KC Chambers, T de Boer, V D'Elia, M De Pasquale, A de Ugarte Postigo, Dimple, R Fender, MD Fulton, H Gao, JH Gillanders, DA Green, M Gromadzki, A Gulati, DH Hartmann, ME Huber, NPM Kuin, JK Leung, AJ Levan, C-C Lin, E Magnier, DB Malesani, P Minguez, KP Mooley, T Mukherjee, M Nicholl, PT O'Brien, G Pugliese, A Rossi, SD Ryder, B Sbarufatti, B Schneider, F Schüssler, SJ Smartt, KW Smith, S Srivastav, D Steeghs, NR Tanvir, CC Thoene, SD Vergani, RJ Wainscoat, Z-N Wang, RAMJ Wijers, D Williams-Baldwin, I Worssam, T Zafar
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The peculiar hard state behaviour of the black hole X-ray binary Swift J1727.8−1613

Monthly Notices of the Royal Astronomical Society Oxford University Press 542:3 (2025) 1803-1816

Authors:

AK Hughes, F Carotenuto, TD Russell, AJ Tetarenko, JCA Miller-Jones, RM Plotkin, A Bahramian, JS Bright, FJ Cowie, J Crook-Mansour, R Fender, JK Khaulsay, A Kirby, S Jones, M McCollough, R Rao, GR Sivakoff, SD Vrtilek, DRA Williams-Baldwin, CM Wood, D Altamirano, P Casella, N Castro Segura, S Corbel, S Motta

Abstract:

Tracking the correlation between radio and X-ray luminosities during black hole X-ray binary outbursts is a key diagnostic of the coupling between accretion inflows (traced by X-rays) and relativistic jet outflows (traced by radio). We present the radio–X-ray correlation of the black hole low-mass X-ray binary Swift J1727.8–1613 during its 2023–2024 outburst. Our observations span a broad dynamic range, covering 4 orders of magnitude in radio luminosity and 6.5 in X-ray luminosity. This source follows an unusually radio-quiet track, exhibiting significantly lower radio luminosities at a given X-ray luminosity than both the standard (radio-loud) track and most previously known radio-quiet systems. Across most of the considered distance range (–4.3 kpc), Swift J1727.8–1613 appears to be the most radio-quiet black hole binary identified to date. For distances kpc, while Swift J1727 becomes comparable to one other extremely radio-quiet system, its peak X-ray luminosity ( erg s) exceeds that of any previously reported hard-state black hole low-mass X-ray binary, emphasizing the extremity of this outburst. Additionally, for the first time in a radio-quiet system, we identify the onset of X-ray spectral softening to coincide with a change in trajectory through the radio–X-ray plane. We assess several proposed explanations for radio-quiet behaviour in black hole systems in light of this data set. As with other such sources, however, no single mechanism fully accounts for the observed properties, highlighting the importance of regular monitoring and the value of comprehensive (quasi-)simultaneous data-sets.
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