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arxiv: 2601.19997 · v2 · submitted 2026-01-27 · 🌌 astro-ph.IM · astro-ph.HE· hep-ex

POEMMA-Balloon with Radio: A multi-messenger, multi-detector balloon payload

J.Adams , J.Alfaro , D.Allard , P.Alldredge , R.Aloisio , R.Ammendola , A.Anastasio , L.Anchordoqui
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D.Badoni J.Bal\'a\v{z} B.Baret L.Bar-On M.Battisti R.Bellotti M.Bertaina M.Betts S.Blin M.Boezio P.Bo\v{r}il J.Brague I.Buckland J.Burton Heibges F.S.Cafagna P.Cao J.Caraca R.Caruso M.Casolino K.\v{C}ern\'y N.Cordrey A.Creusot A.Cummings P.Degarate C.De Santis A.DiGiovanni B.J.DiLella A.DiSalvo J.Eser S.Ferrarese G.Filippatos W.Finch J.Ford C.Fornaro A.Fox-Smith A.Froid P.G\'alvez Molina S.Garbolino D.Garg B.Gockel C.Guepin A.Haungs T.Heibges J.Hicks J.Hinkel J.Krizmanic L.Kupari E.H.Lenzing F.Liberatori S.Mackovjak D.Mand\'at M.Manfrin A.Marcelli L.Marcelli G.Masciantonio V.Masone E.Mayotte E.Mentzell A.Meli M.Mese S.Meyer M.Mignone M.Miller M.Mongelli J.Moses E.Msihid R.Munini M.Murdock A.Novikov S.O'Brien A.V.Olinto Y.Onel G.Osteria B.Panico E.Parizot G.Passeggio T.Paul M.Pech K.Penalo Castillo F.Perfetto C.Petta P.Picozza L.Piotrowski Z.Plebaniak H.Qureshi E.Reali M.H.Reno M.Ricci E.Ricci A.Rivetti A.Roy F.Sarazin V.Scherini P.Schov\'anek F.G.Schroeder V.Scotti C.Shay A.Sotgiu R.Sparvoli B.Stillwell I.Strh\'arsk\'y J.Szabelski Y.Takizawa R.Torres R.Triggiani C.Trimarelli C.Tussey J.Tutt M.Unger T.Venters M.Venugopal P.von Ballmoos L.Wanner D.Washington R.Webb A.Weindl L.Wiencke S.Wissel A.Yuan
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Pith reviewed 2026-05-16 10:21 UTC · model grok-4.3

classification 🌌 astro-ph.IM astro-ph.HEhep-ex
keywords ultra-high-energy cosmic raysextensive air showersfluorescence detectionradio detectionballoon-borne instrumentcosmic ray spectrummulti-messenger
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The pith

A balloon payload will validate space-based fluorescence detection of cosmic rays and capture simultaneous optical and radio signals from PeV air showers.

A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.

The paper outlines a compact balloon-borne payload that pairs a wide-field Schmidt telescope with a hybrid optical focal surface and a radio detector for observing extensive air showers. This design is intended to confirm the fluorescence detection approach planned for space missions by operating at suborbital altitudes. It targets the first simultaneous measurements of optical Cherenkov light and radio emissions from high-altitude horizontal air showers at energies above 3 PeV. Such data would support analyses of the cosmic ray energy spectrum and composition in the PeV range, along with searches for very-high-energy neutrinos triggered by multi-messenger alerts.

Core claim

The payload couples a wide field-of-view Schmidt telescope and hybrid optical focal surface with a dedicated radio instrument to deliver simultaneous, complementary measurements of extensive air showers, validating fluorescence detection from space and enabling the first simultaneous optical Cherenkov and radio observations of high-altitude horizontal air showers above the cosmic-ray knee at energies greater than 3 PeV.

What carries the argument

The hybrid optical focal surface paired with the radio instrument within the Schmidt telescope, which performs complementary optical and radio measurements of the same air shower events.

If this is right

  • Confirmation of the fluorescence detection strategy for future space-based observatories.
  • Acquisition of the first simultaneous optical Cherenkov and radio data on high-altitude air showers.
  • Provision of data for energy spectrum and composition studies at the PeV scale.
  • Capability to follow up multi-messenger alerts for very-high-energy neutrino detection via upward-going showers.

Where Pith is reading between the lines

These are editorial extensions of the paper, not claims the author makes directly.

  • Long-duration flights could demonstrate the feasibility of extended observations that bridge ground-based and space-based cosmic ray experiments.
  • The dual-modality approach may reduce uncertainties in shower energy and direction reconstruction compared to single-technique methods.
  • Data collected could help constrain models of particle interactions at energies inaccessible to accelerators.

Load-bearing premise

The balloon platform and all onboard systems will function without major failures or data issues for the full duration of the more than 20-day campaign.

What would settle it

A lack of detected fluorescence signals from expected air showers or inconsistent correlations between optical and radio detections in the same events would indicate that the performance predictions do not hold.

read the original abstract

A review of the current status of the field of Ultra-High-Energy Cosmic Ray (UHECR) including a summary of remaining open questions was presented in the white paper "Ultra-High Energy Cosmic Rays: at the Intersection of the Cosmic and Energy Frontiers" (Astropart. Phys. 147 (2023) 102794; arXiv:2205.05845). The authors concluded that two types of next-generation detectors are needed to answer these questions: high-accuracy instruments and detectors that maximize exposure at the highest energies. The Probe Of Extreme Multi-Messenger Astrophysics (POEMMA), a proposed dual-satellite observatory, exemplifies the latter class and is designed to increase statistics of the highest-energy cosmic rays and to detect very-high-energy neutrinos following multi-messenger alerts. POEMMA-Balloon with Radio (PBR) implements a compact, balloon-borne version of the POEMMA concept, adapted for a Super-Pressure Balloon flight from Wanaka, New Zealand, with an expected campaign exceeding 20 days. PBR couples a wide field-of-view Schmidt telescope and a hybrid optical focal surface with a dedicated radio instrument to deliver simultaneous, complementary measurements of extensive air showers. The mission will validate the fluorescence detection strategy from space and raise technology readiness for a POEMMA-like space mission by observing UHECR-induced fluorescence light from suborbital altitudes, obtaining the first simultaneous optical Cherenkov and radio observations of high-altitude horizontal air showers above the cosmic-ray knee (E>3PeV), enabling energy-spectrum and composition studies at the PeV scale, and performing follow-ups of multi-messenger alerts to search for very-high-energy neutrinos via upward-going air showers. This paper summarizes the PBR payload and its expected performance.

Editorial analysis

A structured set of objections, weighed in public.

Desk editor's note, referee report, simulated authors' rebuttal, and a circularity audit. Tearing a paper down is the easy half of reading it; the pith above is the substance, this is the friction.

Referee Report

2 major / 2 minor

Summary. The manuscript describes the design of the POEMMA-Balloon with Radio (PBR) payload, a compact balloon-borne implementation of the POEMMA concept for a >20-day Super-Pressure Balloon flight from Wanaka. It integrates a wide field-of-view Schmidt telescope with a hybrid optical focal surface and a dedicated radio instrument to perform simultaneous fluorescence, Cherenkov, and radio observations of extensive air showers, with goals of validating space-based fluorescence detection, obtaining the first simultaneous optical Cherenkov plus radio data on horizontal air showers above 3 PeV, enabling PeV-scale spectrum and composition studies, and following up multi-messenger alerts for very-high-energy neutrinos.

Significance. If the performance projections are realized, the work would deliver important technology validation for the full POEMMA space mission and provide unique multi-messenger data on cosmic-ray air showers at the knee and above, complementing ground-based arrays with suborbital vantage and hybrid detection. The hybrid optical-radio approach and long-duration flight capability represent a concrete step toward maximizing exposure at the highest energies while addressing open questions in UHECR physics.

major comments (2)
  1. [expected performance section] The section describing expected performance (referenced in the abstract and payload summary): the claims of achieving the stated exposure and first simultaneous observations over the full >20-day campaign rest on unquantified assumptions of ideal detector operation; no error budget, thermal/vibration margins, or sensitivity analysis to pointing instability, power degradation, or RFI is provided, directly affecting the load-bearing assertion that PBR will validate the fluorescence strategy and deliver the multi-messenger dataset.
  2. [payload description] Payload integration description: the hybrid focal surface and radio instrument are presented without explicit discussion of trigger coincidence logic, data synchronization timing, or reconstruction algorithms for simultaneous optical-radio events, which is required to substantiate the central claim of obtaining the first such observations of E>3 PeV horizontal showers.
minor comments (2)
  1. [abstract] Abstract: 'E>3PeV' should be formatted as 'E > 3 PeV' for consistency with standard notation.
  2. [introduction] The manuscript references the POEMMA white paper but would benefit from explicit cross-citations to specific prior simulation results or technology heritage papers when stating expected performance.

Simulated Author's Rebuttal

2 responses · 0 unresolved

We thank the referee for the constructive comments on our manuscript describing the POEMMA-Balloon with Radio (PBR) payload. We address each major comment below and will incorporate revisions to strengthen the discussion of performance projections and payload integration details.

read point-by-point responses

  1. Referee: [expected performance section] The section describing expected performance (referenced in the abstract and payload summary): the claims of achieving the stated exposure and first simultaneous observations over the full >20-day campaign rest on unquantified assumptions of ideal detector operation; no error budget, thermal/vibration margins, or sensitivity analysis to pointing instability, power degradation, or RFI is provided, directly affecting the load-bearing assertion that PBR will validate the fluorescence strategy and deliver the multi-messenger dataset.

    Authors: We agree that the expected performance claims would be more robust with additional quantification of assumptions and uncertainties. In the revised manuscript, we will expand the expected performance section to include a dedicated subsection on key assumptions (e.g., nominal optical and radio efficiencies, atmospheric transmission models) and provide a preliminary sensitivity analysis addressing pointing instability, power degradation, and RFI levels based on existing balloon flight data. While a complete error budget and full thermal/vibration margins analysis exceeds the scope of this design overview paper, we will reference ongoing engineering studies and note that these will be detailed in a companion technical report. This revision will better support the assertions regarding fluorescence validation and multi-messenger data collection. revision: yes

  2. Referee: [payload description] Payload integration description: the hybrid focal surface and radio instrument are presented without explicit discussion of trigger coincidence logic, data synchronization timing, or reconstruction algorithms for simultaneous optical-radio events, which is required to substantiate the central claim of obtaining the first such observations of E>3 PeV horizontal showers.

    Authors: We acknowledge the need for greater detail on the integration aspects to substantiate the simultaneous observation claims. In the revised version, we will expand the payload description section to explicitly describe the hybrid trigger coincidence logic (using a multi-level system with optical Cherenkov triggers in coincidence with radio signals within a ~10 μs window), the data synchronization approach (leveraging GPS-disciplined oscillators for sub-microsecond timing alignment across instruments), and a high-level overview of the reconstruction algorithms for joint optical-radio events (including direction and energy estimation via combined fluorescence/Cherenkov and radio waveform fitting). Detailed algorithm implementations will be noted as work in progress for a future publication, but the added description will clarify the feasibility of the first simultaneous E>3 PeV observations. revision: yes

Circularity Check

0 steps flagged

No circularity in design proposal

full rationale

The paper is a payload design summary and performance projection document. It references the prior POEMMA white paper (arXiv:2205.05845) for overarching concepts but introduces no derivations, equations, fitted parameters, or predictions that reduce by construction to quantities defined within its own text. Expected exposure, trigger rates, and observation capabilities are stated as modeled outcomes without self-referential loops or load-bearing self-citations that substitute for independent verification. This matches the default non-circular outcome for a proposal paper.

Axiom & Free-Parameter Ledger

0 free parameters · 0 axioms · 0 invented entities

No mathematical derivations, free parameters, or new physical entities are introduced; the paper is an engineering proposal that relies on established air-shower physics and prior POEMMA concepts.

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Forward citations

Cited by 1 Pith paper

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score.

  1. Ultra-High-Energy Tau Neutrinos as Probes of Lorentz Invariance

    hep-ph 2026-04 unverdicted novelty 5.0

    Ultra-high-energy tau neutrino detections at GRAND and POEMMA are projected to constrain Lorentz invariance violation parameters orders of magnitude more stringently than current lower-energy probes.

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