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"3613 results found.
- GRB990806 UBVRIJHK observations
- GRB990704, optical observations
- IPN error box for GRB990527
- IPN localization for GRB990506
- GRB 990316, Optical observations
- GRB990308, Possible new SGR~0209+70
- GRB990123, early optical counterpart detection
- GRB 981226 Optical Observations
- GRB 981226 optical observations
- GRB980326 IPN annulus
- Near-IR follow-up on GRB 971227
- Optical Observations of the GRB 971227 field
- GRB971227: Further CAHA R-band images