GCN Circulars
GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. See the documentation for help with subscribing to or submitting Circulars.
Search for Circulars by submitter, subject, or body text (e.g. 'Fermi GRB').
To navigate to a specific circular, enter the associated Circular ID (e.g. 'gcn123', 'Circular 123', or '123').
To navigate to a specific circular, enter the associated Circular ID (e.g. 'gcn123', 'Circular 123', or '123').
Advanced Search
To narrow the search results, use advanced search syntax. This allows for specifying which circular field to search (submitter, subject, and/or body). For additional information, refer to the advanced search documentation.
Advanced Search Examples (click to copy):
subject:"Swift"body:"GRB"submitter:"Judith Racusin"16 results found.
- LIGO/Virgo S190421ar: Updated localization and classification from LIGO and Virgo data
- LIGO/Virgo S190421ar: Fermi-LAT search for a high-energy gamma-ray counterpart
- LIGO-Virgo S190421ar:Insight-HXMT/HE observation
- LIGO/Virgo S190421ar: TAROT-GRANDMA observation report.
- LIGO/Virgo S190421ar: Lick/KAIT Follow-Up Observations
- LIGO/Virgo S190421ar: Swift/BAT Counterpart Search
- LIGO/Virgo S190421ar/G330308: ANTARES neutrino search
- LIGO/Virgo S190421ar: MAXI/GSC Observations
- LIGO/Virgo S190421ar: INTEGRAL prompt observation
- LIGO/Virgo S190421ar: Fermi-GBM Observations
- LIGO/Virgo S190421ar Global MASTER-Net observations report
- LIGO/Virgo S190421ar: HAWC follow-up
- AT LIGO-Virgo S190421ar: AGILE GRID observations
- LIGO/VIRGO S190421ar: IceCube Neutrino Search
- LIGO/Virgo S190421ar: Identification of a GW compact binary merger candidate
- LIGO-Virgo S190421ar: AGILE MCAL observations