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"18 results found.
- GRB 191019A: Zadko Telescope optical observations
- GRB 191019A: NOT optical afterglow and host association confirmation
- GRB 191019A: Nanshan-0.6m optical observations
- GRB 191019A: Swift/UVOT Detection
- HAWC-191019A: Retraction of burst alert
- HAWC-191019A: No Neutrino Counterpart detected with ANTARES
- GRB 191019A: Swift-XRT updated analysis
- GRB 191019A: Swift-BAT refined analysis
- GRB 191019A: Swift-XRT refined Analysis
- GRB 191019A: Enhanced Swift-XRT position
- GRB 191019A: GROND observations
- GRB 191019A: NOT optical spectroscopy of candidate counterpart
- GRB 191019A: NOT optical observations
- Alert from the HAWC Burst Monitor HAWC-191019A
- GRB 191019A: TSHAO optical observations, probable afterglow and host galaxy
- GRB 191019A: Swift-XRT observations
- GRB 191019A: MASTER optical observation
- GRB 191019A: Swift detection of a burst