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"15 results found.
- IceCube-191122A: No significant detection in HAWC
- IceCube-191122A: Not observable by Fermi-GBM
- IceCube-191122A: Upper limits from a search for additional neutrino events in IceCube
- Fermi-LAT Gamma-ray Observations of IceCube-191122A
- IceCube-191122A: INTEGRAL was inactive at the time of the event
- IceCube-191122A: Global MASTER-Net observations report
- GRB 191122A: Swift/UVOT Upper Limits
- IceCube-191122A - IceCube observation of a high-energy neutrino candidate event
- GRB 191122A: Swift-BAT refined analysis
- GRB 191122A: Swift-XRT refined Analysis
- GRB 191122A: BOOTES-4/MET optical limit
- GRB 191122A: Enhanced Swift-XRT position
- GRB 191122A: CHES Optical Observations
- GRB 191122A: Prompt enhanced Swift-XRT position
- GRB 191122A: Swift detection of a burst