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"14 results found.
- GRB 241213A: VIRT Optical Upper Limit
- GRB 241213A (EP241213a): GRBAlpha detection
- GRB 241213A: Swift-BAT refined analysis
- Konus-Wind detection of GRB 241213A (EP 241213a)
- GRB 241213A: SVOM/VT optical candidate
- GRB 241213A: Swift/UVOT Upper Limits
- GRB 241213A: Swift-XRT refined Analysis
- GRB 241213A: LCOGT Optical Upper Limits
- EP241213a/GRB241213a: Likely joint detection and INTEGRAL/SPI-ACS counterpart
- GRB 241213A: REM optical/NIR upper limits
- GRB 241213A: Enhanced Swift-XRT position
- GRB 241213A: SAO RAS optical upper limit
- Swift GRB 241213A: Global MASTER-Net observations report
- GRB 241213A: Swift detection of a burst