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.
Lucene Examples (click to copy):
subject:"Swift"body:"GRB"submitter:"Judith Racusin"19 results found.
- GRB 080229: Faulkes Telescope South optical limit
- GRB071021 : CFHT Ks-band observation
- GRB 071021: R-band detection and analysis
- Possible radio detection of GRB 071021 with the VLA
- GRB 071021: (Relatively shallow) IR non-detections; motivation for optical spectroscopy
- GRB 071021: Subaru NIR observation
- GRB 071021: Magellan i-band observation
- GRB 071021: Magellan R-band observation
- GRB 071021: Z-band detection
- GRB 071021: correction to GCNC 6968
- GRB 071021: optical and NIR observations
- GRB 071021: possible high-z burst
- GRB 071021, Swift-BAT refined analysis
- GRB 071021: retraction of Faulkes Telescope South candidate
- GRB 071021: Swift-XRT Team refined analysis
- GRB 071021: Xinglong TNT optical Upper Limit
- GRB 071021 : Lulin R-band limit
- GRB 071021: Faulkes Telescope South optical candidate
- GRB 071021: Swift detection of a burst