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"14 results found.
- GRB 160310A: Terskol 2-m observations
- IPN Triangulation of GRB 160310A
- GRB 160310A: A further Swift-XRT observation, no afterglow detected
- GRB 160310A: MASTER-Kislovods observations
- GRB 160310A: Further NOT observations
- GRB 160310A: Swift/UVOT Upper Limits
- Konus-Wind observation of GRB 160310A (possible ultra-long GRB?)
- GRB 160310A: RATIR Optical and NIR Observations
- GRB 160310A: NOT optical observations
- GRB 160310A: LCOGT-SAAO optical upper limits
- GRB 160310A: Swift-XRT observations
- GRB 160310A: Fermi GBM observation
- GRB 160310A: Swift ToO observations
- GRB 160310A: Fermi-LAT detection