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"12 results found.
- GRB 240715A: Swift-XRT afterglow detection
- GRB 240715A: Swift/UVOT observations of the XRT sources.
- GRB 240715A: Swift-XRT observations
- GRB 240715A: GECAM-C detection of a short burst
- Konus-Wind detection of GRB 240715A
- GRB 240715A: TRT optical upper limit on one Swift/XRT candidate
- SVOM/GRM In-Flight Trigger of GRB 240715A
- GRB 240715A: Swift ToO observations
- Fermi GRB 240715A: Global MASTER-Net observations report
- GRB 240715A: Fermi GBM Observation
- IPN triangulation of GRB 240715A (short)
- GRB 240715A: Fermi GBM Final Real-time Localization