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 251007B: Swift-BAT refined analysis
- Konus-Wind detection of GRB 251007A
- GRB251007A: Swift/UVOT Detection
- GRB 251007A: Swift-BAT refined analysis
- GRB 251007A: SVOM/GRM observation
- GRB 251007A: Insight-HXMT detection
- GRB 251007A: 1.5m OSN and 2.2m CAHA optical follow-up
- GRB 251007A: AstroSat CZTI detection
- GRB 251007A: Swift-XRT refined Analysis
- GRB 251007A: Enhanced Swift-XRT position
- GRB 251007A: NOT optical observations
- GRB 251007A: AKO Optical Upper Limit
- GRB 251007A: CALET Gamma-Ray Burst Monitor detection
- GRB 251007A: SVOM/C-GFT optical observations
- GRB 251007A: Glowbug gamma-ray detection
- Swift GRB 251007A: Global MASTER-Net observations report
- GRB 251007B: Swift detection of a burst
- GRB 251007A: Swift detection of a burst with an optical counterpart