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 200528A: CAHA Upper Limit
- GRB 200528A: CALET Gamma-Ray Burst Monitor detection
- GRB 200528A: Swift-XRT refined Analysis
- GRB 200528A: Assy optical upper limit
- GRB 200528A: NOT optical upper limits
- GRB 200528A: Fermi GBM Observation
- GRB 200528A: Swift/UVOT Upper Limits
- GRB 200528A: Swift-BAT refined analysis
- GRB 200528A: 1.3m DFOT Optical Upper Limits
- GRB 200528A: Nanshan/NEXT optical upper limit
- GRB 200528A: Enhanced Swift-XRT position
- Swift GRB 200528A: Global MASTER-Net observations report
- GRB 200528A: MITSuME Akeno optical upper limits
- GRB 200528A: Potential host galaxy in PanSTARRS, SDSS and WISE
- GRB 200528A: Swift detection of a burst
- GRB 200528A: Fermi GBM Final Real-time Localization