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"16 results found.
- GRB 240912A: radio detection with the VLA
- Konus-Wind detection of GRB 240912A
- GRB 240912A: Swift-BAT refined analysis
- GRB 240912A: Swift/UVOT Detection
- GRB 240912A: SVOM/GRM observation
- GRB 240912A: J-band observations with WINTER
- GRB 240912A: Swift-XRT refined Analysis
- GRB 240912A: Fermi GBM Observation
- Swift GRB 240912A: Global MASTER-Net observations report
- GRB 240912A: LCOGT detection and Legacy Surveys likely host galaxy
- GRB 240912A : INTEGRAL SPI ACS LIGHT CURVE
- GRB 240912A: NOT optical spectroscopy
- GRB 240912A: Enhanced Swift-XRT position
- GRB 240912A: Redshift from OSIRIS+/GTC
- GRB 240912A: Swift detection of a burst with an optical counterpart
- GRB 240912A: Fermi GBM Final Real-time Localization