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"20 results found.
- GRB 111117A: Refined GMG observation
- GRB 111117A: Refined Chandra Astrometry
- GRB 111117A, the review of the sky area in plate archives
- GRB 111117A: Chandra detection of the afterglow
- GRB 111117A: Gemini Afterglow Limits
- GRB 111117A: optical upper limit in CrAO
- GRB 111117A: Fermi GBM observation
- GRB 111117A: further NOT observations
- GRB 111117A: EVLA observations
- GRB 111117A: TNG observations
- GRB 111117A: Swift/UVOT Upper Limits
- GRB 111117A: GROND observations
- GRB 111117A: Gemini host observation
- GRB111117A: Magellan IMACS observations
- GRB 111117A: Swift-XRT refined Analysis
- GRB 111117A: NOT observations
- GRB 111117A: Chandra ToO observation scheduled
- GRB 111117A: Swift-BAT refined analysis of a short hard burst
- GRB 111117A: GMG upper limit
- GRB 111117A: Swift detection of a short hard burst