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"914 results found.
- GRB 020409, 2-nd epoch optical observations at Terskol.
- GRB 020409, No Optical Detection to R = 22
- Type Ic SN2002bl (SN/GRB?) Radio Observations
- GRB020124 BVRI field photometry
- GRB011212, Optical Observations
- GRB000926, Host Galaxy Observations
- GRB010222, field photometry
- GRB 010220, simultaneous optical observations
- Late-time HST/STIS Observations of GRB 990510
- GRB990506 observation plan
- GRB980425 Optical observations of exponential decline at late time
- GRB 981220 Optical observations
- GRB980703, Host galaxy multicolor photometry
- GRB970508 SAO RAS optical observations