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"15 results found.
- GRB 240511A: LCO upper limits
- GRB 240511A: Observations from GTC/OSIRIS+
- GRB 240511A: radio detection of afterglow candidate
- GRB 240511A: Fermi GBM Observation
- GRB 240511A: Swift-BAT refined analysis
- GRB 240511A: J-band observations with WINTER
- GRB 240511A: Enhanced Swift-XRT position
- GRB 240511A : MITSuME Akeno optical upper limits
- GRB 240511A: Swift-XRT refined Analysis
- GRB 240511A: optical afterglow detection from the NOT
- Fermi GRB 240511A: Global MASTER-Net observations report
- Swift GRB 240511A: Global MASTER-Net observations report
- GRB 240511A: Prompt enhanced Swift-XRT position
- GRB 240511A: Swift detection of a burst
- GRB 240511A: Fermi GBM Final Real-time Localization