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.
- GRB180325A: AstroSat CZTI detection
- GRB 180325A: VLT/X-shooter spectroscopic observations
- GRB 180325A: further NOT observations
- GRB 180325A: Swift/UVOT Detection
- Konus-Wind observation of GRB 180325A
- GRB 180325A, Swift-BAT refined analysis
- GRB 180325A: GROND observations
- GRB 180325A: Global MASTER-Net OT prompt observations
- GRB 180325A: TAROT Calern observatory optical observations
- GRB 180325A: D50 early optical follow-up
- GRB 180325A: Swift-XRT refined Analysis
- GRB 180325A: Enhanced Swift-XRT position
- GRB 180325A: Optical Photometry with SLKT
- GRB 180325A: RATIR Optical Observations
- GRB 180325A: prompt REM optical/NIR detection
- GRB 180325A: NOT redshift
- GRB 180325A: prompt LT observations
- GRB 180325A: Swift detection of a burst with an optical counterpart