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"13 results found.
- GRB 160821B: HST detection of the optical and IR counterpart
- GRB 160821B: 15 GHz upper limits from AMI
- GRB 160821B: VLA 5.0 GHz observations
- GRB 160821B: GTC follow-up observation
- GRB 160821B: WHT afterglow confirmation and redshift of candidate host
- GRB 160821B: Swift-BAT refined analysis
- GRB 160821B: Fermi GBM Detection
- GRB 160821B: Swift-XRT refined Analysis
- GRB 160821B: Swift/UVOT Upper Limits
- Short GRB 160821B: MASTER early optical observations
- GRB 160821B: Enhanced Swift-XRT position
- GRB 160821B: NOT optical afterglow candidate
- GRB 160821B: Swift detection of a short burst