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Whether a missing IceCube event can be recovered depends on where it disappeared. A Digital Optical Module (DOM) may fail to provide hits, the trigger system may not select those hits for an event, or later software may omit a frame from an output file. IceCube documents temporary buffering of raw hits for special analysis cases, but it does not publish a universal retention window or promise that every missing event can be restored.
What “dropped event” can mean in IceCube
IceCube’s data-acquisition system (DAQ) collects hits from DOMs, applies triggers, and assembles selected data into events. The word “drop” can refer to different points in that path, and those cases have different recovery prospects.
- Acquisition: A DOM fails to report usable hits or becomes unresponsive. If the detector did not record a measurement, downstream software cannot recreate it.
- Triggering and event building: Hits may be acquired but not included in a triggered event. An event missing from an output does not, by itself, show that a sensor failed.
- Temporary hit preservation: IceCube describes HitSpooling, which buffers raw hits for a limited time and can preserve them for special analysis cases. The public description does not give a universal duration or guarantee that a particular spool exists. IceCube operations
- Offline processing and writing: A later processing step can omit data from a derived file. That is different from losing measurements during detector acquisition.
How hits become events
IceCube’s DAQ starts with raw DOM hits, applies triggering, and gathers relevant data into event records. A historical description of the architecture says StringHubs collect and time-sort DOM data, trigger components create event descriptions, and an EventBuilder assembles the resulting event stream. It also describes dropping an unresponsive DOM from the current run. That is a response to a component problem—not a way to reconstruct hits the DOM never supplied—and the account dates to 2008, so it should not be treated as a verified description of every current run. Historical IceCube DAQ architecture paper
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Recovery is plausible only if the relevant data were recorded and remain available in a form that can be retrieved or reprocessed. HitSpooling offers a limited-time, special-case preservation path for available raw hits; the public operations description does not say that every hit is retained or that spooling is enabled for every incident. A hit that was never recorded cannot be recovered by later reconstruction.
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For an incident, first identify the run and time interval, then determine which layer is in question: DOM acquisition, trigger or event selection, temporary spooling, or downstream file processing. The run records and, where applicable, spool availability are the evidence needed to establish what happened. IceCube’s operations plan assigns DAQ software engineers responsibility for uptime and for the integrity, correctness, and completeness of produced data, and says they test and upgrade DAQ systems regularly. This supports directing run-specific operational questions to the responsible IceCube team; it is not a guarantee of recovery. IceCube Operations Plan, 2021 v1.0
Why a missing frame in an analysis file may not mean sensor loss
IceTray distinguishes DAQ frames from child Physics views. Its Q-frame documentation describes a writer option that drops orphan DAQ frames when their child physics events have been dropped. A frame absent from a derived file may therefore reflect filtering or writing choices rather than a DOM failure or a missing live measurement. IceTray Q-frame documentation
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To diagnose an apparent gap, check whether the raw hits were acquired, whether they were part of a relevant trigger and event, whether temporary spooled data exist, and whether later filtering or frame writing removed the record. A gap in a downstream file alone cannot distinguish among these explanations.
What IceCube public data can—and cannot—recover
The Open Data Format describes calibrated event data, including run, trigger, timestamp, and hit information. It helps researchers decode and analyze released data; its stated purpose is not to repair a live detector stream. IceCube Open Data Format
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IceCube releases data after main analyses are completed and results are published. Its releases page lists IceTracks-DR2, covering track-like observations from 2008–2022, with a release date of May 21, 2026. That public dataset is not described as a complete copy of raw operational data, so it should not be treated as a way to restore an event missing from a live acquisition stream. IceCube data releases
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