
@ARTICLE{reichherzer_astro-colibricoincidence_2021,
	title = {Astro-{COLIBRI}—{The} {COincidence} {LIBrary} for {Real}-time {Inquiry} for {Multimessenger} {Astrophysics}},
	volume = {256},
	issn = {0067-0049, 1538-4365},
	url = {https://iopscience.iop.org/article/10.3847/1538-4365/ac1517},
	doi = {10.3847/1538-4365/ac1517},
	abstract = {Abstract
            Astro-COLIBRI is a novel tool that evaluates alerts of transient observations in real time, filters them by user-specified criteria, and puts them into their multiwavelength and multimessenger context. Through fast generation of an overview of persistent sources as well as transient events in the relevant phase space, Astro-COLIBRI contributes to an enhanced discovery potential of both serendipitous and follow-up observations of the transient sky. The software’s architecture comprises a Representational State Transfer Application Programming Interface, both a static and a real-time database, a cloud-based alert system, as well as a website and apps for iOS and Android as clients for users. The latter provide a graphical representation with a summary of the relevant data to allow for the fast identification of interesting phenomena along with an assessment of observing conditions at a large selection of observatories around the world.},
	number = {1},
	urldate = {2026-01-20},
	journal = {The Astrophysical Journal Supplement Series},
	author = {Reichherzer, P. and Schüssler, F. and Lefranc, V. and Yusafzai, A. and Alkan, A. K. and Ashkar, H. and Becker Tjus, J.},
	month = sep,
	year = {2021},
	pages = {5},
	file = {Submitted Version:/Users/bc279364/Zotero/storage/JMMS6XTY/Reichherzer et al. - 2021 - Astro-COLIBRI—The COincidence LIBrary for Real-time Inquiry for Multimessenger Astrophysics.pdf:application/pdf},
}

@ARTICLE{reichherzer_astro-colibri_2023,
	title = {Astro-{COLIBRI} 2—{An} {Advanced} {Platform} for {Real}-{Time} {Multi}-{Messenger} {Discoveries}},
	volume = {11},
	issn = {2075-4434},
	url = {https://www.mdpi.com/2075-4434/11/1/22},
	doi = {10.3390/galaxies11010022},
	abstract = {The study of flaring astrophysical events in the multi-messenger approach requires instantaneous follow-up observations to better understand the nature of these events through complementary observational data. We present Astro-COLIBRI as a platform that integrates specific tools in the real-time multi-messenger ecosystem. The Astro-COLIBRI platform bundles and evaluates alerts about transients from various channels. It further automates the coordination of follow-up observations by providing and linking detailed information through its comprehensible graphical user interface. We present the functionalities with documented examples of Astro-COLIBRI usage through the community since its public release in August 2021. We highlight the use cases of Astro-COLIBRI for planning follow-up observations by professional and amateur astronomers, as well as checking predictions from theoretical models.},
	language = {en},
	number = {1},
	urldate = {2026-01-20},
	journal = {Galaxies},
	author = {Reichherzer, Patrick and Schüssler, Fabian and Lefranc, Valentin and Becker Tjus, Julia and Mourier, Jayson and Alkan, Atilla Kaan},
	month = jan,
	year = {2023},
	pages = {22},
	file = {Full Text:/Users/bc279364/Zotero/storage/888AAIEJ/Reichherzer et al. - 2023 - Astro-COLIBRI 2—An Advanced Platform for Real-Time Multi-Messenger Discoveries.pdf:application/pdf},
}

@ARTICLE{hoischen_hess_2022,
	title = {The {H}.{E}.{S}.{S}. transients follow-up system},
	volume = {666},
	copyright = {https://creativecommons.org/licenses/by/4.0},
	issn = {0004-6361, 1432-0746},
	url = {https://www.aanda.org/10.1051/0004-6361/202243092},
	doi = {10.1051/0004-6361/202243092},
	abstract = {Observations of astrophysical transients have brought many novel discoveries and provided new insights into the physical processes at work under extreme conditions in the Universe. Multi-wavelength and multi-messenger observations of variable objects require dedicated procedures and follow-up systems capable of digesting and reacting to external alerts to execute coordinated follow-up campaigns. The main functions of such follow-up systems are the processing, filtering, and ranking of the incoming alerts, the fully automated rapid execution of the observations according to an observation strategy tailored to the instrument, and real-time data analysis with feedback to the operators and other instruments. The High Energy Stereoscopic System (H.E.S.S.) has been searching for transient phenomena since its inauguration in 2003. In this paper, we describe the transients follow-up system of H.E.S.S. which became operational in 2016. The system allows H.E.S.S. to conduct a more versatile, optimised, and largely autonomous transient follow-up programme, combining all major functionalities in one systematic approach. We describe the design, central functionalities, and interfaces of the follow-up system in general and its three main components in detail: the Target of Opportunity (ToO) alert system, the data acquisition and central control system, and the real-time analysis. We highlight architectural decisions and features that enable fully automatic ToO follow-up and indicate key performance metrics of the subsystems. We discuss the system's capabilities and highlight the need for a fine-tuned interplay of the different subsystems in order to react quickly and reliably. Lessons learnt from the development, integration, and operation of the follow-up system are reviewed in light of new and large science infrastructures and associated challenges in this exciting new era of inter-operable astronomy.},
	urldate = {2026-01-20},
	journal = {Astronomy \& Astrophysics},
	author = {Hoischen, C. and Füßling, M. and Ohm, S. and Balzer, A. and Ashkar, H. and Bernlöhr, K. and Hofverberg, P. and Holch, T. L. and Murach, T. and Prokoph, H. and Schüssler, F. and Zhu, S. J. and Berge, D. and Egberts, K. and Stegmann, C.},
	month = oct,
	year = {2022},
	pages = {A119},
	file = {Full Text:/Users/bc279364/Zotero/storage/C7X8RMBY/Hoischen et al. - 2022 - The H.E.S.S. transients follow-up system.pdf:application/pdf},
}

@MISC{collins_transients_2025,
	title = {On the {Transients} {Handler} for the {Cherenkov} {Telescope} {Array} {Observatory}},
	copyright = {Creative Commons Attribution 4.0 International},
	url = {https://arxiv.org/abs/2508.20726},
	doi = {10.48550/ARXIV.2508.20726},
	abstract = {The Cherenkov Telescope Array Observatory (CTAO) is a next-generation gamma-ray observatory in both the Southern (Paranal, Chile) and Northern Hemisphere (La Palma, Spain) and will consist of up to 100 imaging atmospheric Cherenkov telescopes. With sensitivity far exceeding current facilities, CTAO will provide detailed measurements of gamma rays from GeV up to a few 100s of TeV. CTAO has a nominal field of view of 10° and will rely on external alerts from observatories such as IceCube (neutrinos), Fermi-LAT (GeV gamma rays), LIGO (gravitational waves (GWs)) or the upcoming Vera C. Rubin Observatory (optical) to trigger observations of targets of opportunity (ToOs). The Transients Handler (TH) is a subsystem of the Array Control and Data Acquisition that will provide the means of handling alerts and schedule follow-up observations. The TH is responsible for (i) filtering of thousands of internal and external alerts per night, (ii) processing of alerts according to the corresponding observation proposal to determine the optimal observation schedule with minimum interruptions to observations and (iii) broadcasting of events detected by CTAO to external facilities. In this work, we will discuss the architecture of the Transients Handler, its latest improvements and future updates},
	urldate = {2026-01-20},
	publisher = {arXiv},
	author = {Collins, Tiffany and Egberts, Kathrin and Steppa, Constantin and Oya, Igor and Neise, Dominik},
	year = {2025},
	note = {Version Number: 2},
	keywords = {FOS: Physical sciences, Instrumentation and Methods for Astrophysics (astro-ph.IM)},
	annote = {Other
Proceedings for the 39th International Cosmic Ray Conference Tiffany Collins (paper CTAO-ICRC/2025/61)},
}

@ARTICLE{seglar-arroyo_cross_2024,
	title = {Cross {Observatory} {Coordination} with tilepy: {A} {Novel} {Tool} for {Observations} of {Multimessenger} {Transient} {Events}},
	volume = {274},
	issn = {0067-0049, 1538-4365},
	shorttitle = {Cross {Observatory} {Coordination} with tilepy},
	url = {https://iopscience.iop.org/article/10.3847/1538-4365/ad5bde},
	doi = {10.3847/1538-4365/ad5bde},
	abstract = {Abstract
            
              Time-domain astrophysics has leaped forward with the direct discovery of gravitational waves and the emergence of new generation instruments for multimessenger studies. The capacity of the multimessenger multiwavelength community to effectively pursue follow-up observations is hindered by the suboptimal localization of numerous transient events and the escalating volume of alerts. Thus, we have developed an effective tool to overcome the observational and technical hurdles inherent in the emerging field of multimessenger astrophysics. We present
              tilepy
              , a Python package for the automatic scheduling of follow-up observations of poorly localized transient events. It is ideally suited to tackle the challenge of complex follow-up in mid- and small-field-of-view telescope campaigns, with or without human intervention. We demonstrate the capabilities of
              tilepy
              in the realm of multiobservatory, multiwavelength campaigns, to cover the localization uncertainty region of various events ultimately aiming at pinpointing the source of the multimessenger emission. The
              tilepy
              code is publicly available on GitHub and is sufficiently flexible to be employed either automatically or in a customized manner, tailored to collaboration and individual requirements.
              tilepy
              is also accessible via a public API and through the Astro-COLIBRI platform.},
	number = {1},
	urldate = {2026-01-20},
	journal = {The Astrophysical Journal Supplement Series},
	author = {Seglar-Arroyo, Monica and Ashkar, Halim and De Bony De Lavergne, Mathieu and Schüssler, Fabian},
	month = sep,
	year = {2024},
	pages = {1},
}

@inproceedings{117_adassxxxv,
    title = "tilepy: A {Flexible} {Open-Source} {Scheduling} {Engine} for {Time-Domain} and {Multi-Messenger} {Astronomy}",
    author = "Schussler, Fabian and Ashkar, H. and Kindrébéogo, W. and Seglar-Arroyo, M. and De Bony, M. and Berti, A. and Ruiz-Velasco, E. and Le Montagner, R.",
    booktitle = "ADASS XXXV",
    year = 2026,
    editor = "TBD",
    volume = "TBD",
    series = "ASP Conf. Ser.",
    pages = "TBD",
    publisher = "ASP",
    address ="San Francisco",
}
