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 221028A: GRANDMA observations
- GRB 221028A: Detection by VZLUSAT-2
- GRB 221028A: Swift-XRT refined Analysis
- GRB 221028A: 1.3m DFOT Optical upper limit
- GRB 221028A: NUTTelA-TAO / BSTI Early Optical Limits
- GRB 221028A: NUTTelA-TAO / BSTI Early Optical Limits
- GRB 221028A: Correction to GCN 32893 - Fluence and flux are for 50-150 keV
- GRB 221028A: AKO Optical Upper Limit
- GRB 221028A, Swift-BAT refined analysis
- GRB 221028A: CrAO/ZTSh optical upper limit
- GRB 221028A: COATLI Upper Limits
- GRB 221028A: HCT optical upper limit
- GRB 221028A: AGILE detection
- GRB 221028A: MITSuME Okayama optical upper limits
- GRB 221028A: LCOGT Optical Upper Limits
- Swift GRB 221028A: Global MASTER-Net observations report
- GRB 221028A: BOOTES-4/MET optical upper limit
- GRB 221028A: GIT optical upper limit
- GRB 221028A: Swift detection of a burst