Skip to main content
Testing. You are viewing the public testing version of GCN. For the production version, go to https://gcn.nasa.gov.
New Announcement Feature, Code of Conduct, Circular Revisions. See news and announcements

CALorimetric Electron Telescope (CALET)

CALET logo

Launch Date: August 19, 2015

Extended Mission Lifetime: 2024+ (Pending NASA and JAXA Review)

End of Operations: Limited by ISS lifetime, currently 2030

Data Archives: JAXA, NASA (HEASARC)

The CALorimetric Electron Telescope (CALET) is a mission on the International Space Station (ISS) studying cosmic rays, signatures for dark matter, and gamma-ray bursts. CALET was developed by JAXA with contributions from the Italian Space Agency and NASA.

InstrumentsEnergy RangeField of View
Hard X-ray Monitor (HXM)40 keV–20 MeV~8 ster
Soft Gamma-ray Monitor (SGM)7 keV–1000 keV~3 ster

GCN Notice Types in GCN Classic and GCN Classic Over Kafka: Detailed Descriptions and Examples

TypeContentsLatency
CALET_GBM_FLT_LCSignifcance and CALET-GBM LightcurveMinutes

Common GCN Circular Types:

TypeLatencyExample
Observation of a GRB1 dayGRB 211115A
Follow-up of a GW triggerhoursLIGO/Virgo S200115j

Yearly Trigger Rates:

InstrumentTypeRates
CALETGRBs, other transients, and non-astrophysical triggers140–150

Approximately half of CALET triggers will be of non-astrophysical origin.

Looking for U.S. government information and services? Visit USA.gov