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 050416(a): Host Galaxy Redshift Determination
- GRB 050416: Optical/NIR observations
- GRB 050416: Mitsume optical observation
- GRB 050416 : optical observation at Xinglong observatory
- GRB 050416: Swift/UVOT refined analysis
- GRB 050416: Swift/UVOT detection of afterglow emission
- GRB 050416: Swift-BAT refined analysis
- GRB 050416: ART observations
- GRB 050416,optical observation
- GRB 050416: KAIT observations
- GRB 050416: Swift XRT Position
- GRB 050416: Radio observations
- Confirmation of OT for GRB050416
- Swift BAT/XRT Detection of GRB 050416