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.
- GRB 071025: Kuiper Telescope Optical Observations
- GRB 071025: SARA VRI upper limits
- GRB 071025 Milagro GeV/TeV Observations
- GRB 071025: SQIID JHK photometry
- GRB071025: Optical Pre-imaging from Palomar
- Swift UVOT upper limits
- GRB 071025: Swift-XRT Team refined analysis
- GRB 071025, Swift-BAT refined analysis
- GRB 071025: Early Super-LOTIS Observations
- GRB 071025: R/I-band update
- GRB 071025: ROTSE-III Refined Analysis
- GRB 071025: I-detection, R-dropout?
- GRB 071025: Swift XRT refined position
- GRB 071025: ROTSE-III Detection of Optical Counterpart
- GRB 071025: Swift detection of a burst