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"20 results found.
- GRB 091024: optical observations
- GRB 091024: Fermi LAT upper limits
- GRB091024 optical observations
- GRB 091024: Keck/LRIS Spectroscopy
- GRB 091024: YNAO-GMG observations
- GRB 091024: Burst was outside the Swift-BAT FOV after T0(BAT)+460sec
- Konus-Wind and Konus-RF observations of GRB 091024
- GRB091024 Swift/UVOT Upper Limits
- GRB 091024: TLS Upper Limit
- GRB 091024: KAIT optical afterglow observations
- GRB 091024: Super-LOTIS early observations
- GRB 091024: Swift-BAT refined analysis
- GRB 091024: Fermi GBM Observations
- GRB 091024: Swift-XRT team refined analysis
- GRB 091024: Xinglong TNT optical observation
- GRB 091024 : Faulkes Telescope North - Afterglow Confirmation
- GRB 091024 Gemini-North redshift
- GRB 091024: GRAS004 optical observations
- GRB 091024: Faulkes Telescope North Afterglow Candidate
- GRB 091024: Swift detection of a burst