Persistent Signal Catalog · Class II
GPM J1839-10
A long-period radio transient whose reported pulses last tens to hundreds of seconds and whose archival record extends across decades. It is retained as a monitoring case because the cadence is slow, coherent, and difficult to fit into ordinary compact-object radio emission categories.
A long-period radio transient whose reported pulses last tens to hundreds of seconds and whose archival record extends across decades. It is retained as a monitoring case because the cadence is slow, coherent, and difficult to fit into ordinary compact-object radio emission categories.
Public packet
- decades-spanning archive search note
- 22-minute cadence and pulse-width summary
- multi-instrument detection crosswalk
- long-period compact-source comparison file
Review controls
- Coordinate source
- NASA HEASARC accepted target coordinate and Hurley-Walker et al. 2023 source record
- Uncertainty
- Public follow-up coordinate; historical radio archive detections span multiple instruments
- Release state
- External literature case retained for comparison
- Marker use
- long-lived long-period radio transient coordinate
Processing notes
- periodicity search across archival radio survey windows
- pulse-width and brightness-variation normalization
- multi-instrument time-base reconciliation
- candidate class comparison against pulsars and magnetars
Ordinary-source checks
- survey-cadence artifact review
- known pulsar and magnetar period-space comparison
- public record does not assign a final source class
Release limits
- archival activity history is summarized rather than reproduced in full
- public packet excludes proprietary follow-up schedules
- classification remains under study