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.
Advanced Search Examples (click to copy):
subject:"Swift"body:"GRB"submitter:"Judith Racusin"18 results found.
- GRB 160601A: 15 GHz upper limits from AMI
- GRB 160601A: AbAO optical observations
- GRB 160601A: Discovery Channel Telescope Limits
- GRB 160601A: Swift/UVOT Upper Limits
- GRB 160601A: MITSuME Akeno optical upper limits
- GRB 160601A: Swift-BAT refined analysis
- GRB 160601A: GTC observations confirming transient source decay
- GRB 160601A: Mondy optical observations, photometry of NOT sources
- GRB160601A: Kanata Telescope I- and Ks-bands upper limits
- GRB160601A: NOT afterglow confirmation
- GRB 160601A: Swift-XRT refined Analysis
- GRB160601A: NOT detection of an afterglow candidate
- GRB 160601A: Enhanced Swift-XRT position
- GRB 160601A: Mondy optical observations
- GRB 160601A: MITSuME Okayama Ks-band upper-limit
- GRB 160601A: MITSuME Okayama upper limits
- GRB 160601A: MASTER-Net observations
- GRB 160601A: Swift detection of a short hard burst