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"22 results found.
- GRB 150423A: GMG observation limit
- GRB 150423A: Chandra X-ray Observation
- GRB 150423A: JCMT SCUBA-2 sub-mm observation
- GRB 150423A: MITSuME Akeno Optical observation
- GRB 150423A: VLT/X-shooter spectroscopy and tentative redshift
- GRB 150423A: Continued RATIR optical afterglow monitoring
- GRB 150423A: TSHAO optical observations
- GRB 150423A: WHT observations
- GRB 150423A: Keck redshift of neighboring galaxy
- GRB 150423A: MITSuME Okayama upper limits
- GRB 150423A: UKIRT NIR observations
- GRB 150423A: Swift-BAT refined analysis
- GRB 150423A: Swift/UVOT Upper Limits
- GRB 150423A: VLT detection
- GRB 150423A: Swift-XRT refined Analysis
- GRB 150423A: RATIR optical afterglow monitoring
- GRB 150423A: Enhanced Swift-XRT position
- GRB 150423A: Keck optical afterglow confirmation
- GRB 150423A: GROND afterglow candidate
- GRB 150423A: KAIT Optical Upper Limit
- GRB 150423A: GROND observation
- GRB 150423A: Swift detection of a short burst