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"16 results found.
- GRB 121123A: optical observations
- GRB 121123A: NIKA (New IRAM KID Arrays) millimetre observations at the 30-m Pico Veleta telescope
- GRB 121201A: BOOTES-4 optical observations
- GRB 121123A: Suzaku WAM observation of the prompt emission
- GRB 121123A: Swift/UVOT Observations
- GRB 121123A: GROND observations
- GRB 121123A: Enhanced Swift-XRT position
- GRB 121123A: Swift-BAT refined analysis
- GRB 121123A: Swift-XRT refined Analysis
- GRB 121123A: optical observations
- GRB 121123A: BOOTES-4 and IAC80 optical observations
- GRB 121123A: NOT optical observations
- GRB 121123A: Fermi GBM observation
- GRB 121123A: MASTER-NET optical limit
- GRB 121123A: GMG optical observation
- GRB 121123A: Swift detection of a burst with optical counterpart