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"7 results found.
- LIGO/Virgo/KAGRA S240615dg: GRAWITA wide-field optical observations
- LIGO/Virgo S240615dg: Swift XRT observations, 28 futher X-ray sources
- LIGO/Virgo S240615dg: GRANDMA/FRAM-CTA-N Observations
- LIGO/Virgo/KAGRA S240615dg: Updated Sky localization
- LIGO/Virgo S240615dg: Swift XRT observations, 39 X-ray sources
- LIGO/Virgo/KAGRA S240615dg: Upper limits from Swift/BAT-GUANO
- LIGO/Virgo/KAGRA S240615dg: Identification of a GW compact binary merger candidate