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"17 results found.
- LIGO/Virgo S190503bf: Gaia Photometric Alerts transient candidate
- LIGO/Virgo S190503bf: Gaia Photometric Alerts transient candidate
- LIGO/Virgo S190503bf: TAROT-GRANDMA observation report
- LIGO/Virgo S190503bf: AstroSat CZTI upper limits
- LIGO/Virgo S190503bf: CALET Observations
- LIGO/Virgo S190503bf Global MASTER-Net observations report
- LIGO/Virgo S190503bf: Swift/BAT Counterpart Search
- LIGO/Virgo S190503bf: Fermi-LAT search for a high-energy gamma-ray counterpart
- LIGO/Virgo S190503bf: Insight-HXMT/HE observation
- LIGO/Virgo S190503bf: ANTARES neutrino search
- LIGO/Virgo S190503bf: Fermi-GBM Observations
- LIGO/Virgo S190503bf: MAXI/GSC Observations
- LIGO/Virgo S190503bf: AGILE-GRID Observations
- LIGO/Virgo S190503bf: INTEGRAL prompt observation
- LIGO/Virgo S190503bf: AGILE MCAL observations
- LIGO/Virgo S190503bf: Identification of a GW compact binary merger candidate
- LIGO/Virgo S190503bf: IceCube Neutrino Search