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 181228A: FRAM-ORM optical limit
- GRB 181228A: Mondy and AbAO optical upper limits
- GRB 181228A: Global MASTER Net OT is the same REM IR transient
- GRB 181228A: possible NOT optical detection
- GRB 181228A: MITSuME Akeno optical upper limits
- GRB 181228A: Xinglong-2.16m optical upper limit
- FRB 181228: Global MASTER Net optical inspection
- GRB 181227A: Global MASTER Net oprtical inspection
- GRB 181228A: Swift-XRT refined Analysis
- GRB 181228A: Swift-BAT refined analysis
- GRB 181228A: Swift/UVOT Upper Limits
- GRB 181228A: TSHAO optical upper limit
- GRB 181228A: Fermi GBM observation
- GRB 181228A: Global MASTER Net OT detection
- GRB 181228A: REM NIR detection
- GRB 181228A: Enhanced Swift-XRT position
- GRB 181228A: KAIT Optical Upper Limit
- GRB 181228A: Swift detection of a burst