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"17 results found.
- Chandra observations of GRB 210905A
- GRB 210905A: Swift/UVOT Upper Limits
- GRB 210905A: ATCA detection
- GRB 210905A: ALMA detection
- GRB 210905A: AstroSat CZTI detection
- GRB 210905A, GROND observations
- Konus-Wind detection of GRB 210905A
- Fermi GBM Sub-Threshold Detection of GRB 210905A
- GRB 210905A: Swift-XRT refined Analysis
- GRB 210905A: DECam Detection
- GRB 210905A: REM NIR afterglow detection
- GRB 210905A: VLT/X-shooter spectroscopic redshift
- GRB 210905A: Continued LCO Optical Observations
- GRB 210905A: LCO Optical Detection
- GRB 210905A: Enhanced Swift-XRT position
- Swift GRB 210905A: Global MASTER-Net observations report
- GRB 210905A: Swift detection of a burst