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.
Lucene Examples (click to copy):
subject:"Swift"body:"GRB"submitter:"Judith Racusin"13 results found.
- GRB 241002B: Swift-XRT afterglow detection
- GRB 241002B: PRIME near-infrared detection in 3rd epoch
- GRB 241002B: PRIME near-infrared detection in 2nd epoch
- GRB 241002B: Fermi GBM Observation
- GRB 241002B: Swift-XRT observations
- GRB 241002B: Swift/BAT-GUANO localization skymap of a burst
- GRB 241002B: Swift ToO observations
- GRB 241002B: PRIME near-infrared detection
- GRB 241002B: GOTO24gpc/AT 2024xbg follow-up observations update
- GRB 241002B: ULL-ASTRO-MASTER LCOGT 0.4m + QHY600 detection of the GOTO optical counterpart candidate AT 2024xbg / GOTO24gpc
- GRB 241002B: GOTO optical counterpart candidate
- Fermi GRB 241002B: Global MASTER-Net observations report
- GRB 241002B: Fermi GBM Final Real-time Localization