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"10 results found.
- GRB 050505, early TAROT observation
- GRB 050505: SARA Observations
- GRB 050505: Keck I-band Magnitude
- GRB 050505: early time observations
- GRB 050505 - Faulkes Telescope North observations
- GRB 050505, simultaneous optical observation
- GRB 050505: Further Swift UVOT observations.
- GRB 050505: Keck absorption spectrum and redshift (z=4.27)
- GRB 050505 UVOT
- GRB 050505: Swift XRT Position