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 091020: MASTER-Net optical polarization observations
- GRB 091020: Fermi GBM observation
- GRB 091020: Late TLS detection
- Radio afterglow detection from GRB 091020
- GRB 091024: Burst was outside the Swift-BAT FOV after T0(BAT)+460sec
- GRB 091020 : Xinglong TNT upper limit
- GRB 091020: Early TLS Multicolor detections, red afterglow
- GRB 091020: Additional Lick observations
- Konus-Wind observations of GRB 091020 (correction to GCN 10057)
- GRB 091020: Lick observations
- Konus-Wind observations of GRB 091010
- GRB 091020: Swift-XRT refined analysis
- GRB091020 Swift/UVOT observations
- GRB 091020: NOT spectroscopic redshift
- GRB 091020: MASTER optical transient polarimetry
- GRB 091020, Swift-BAT refined analysis
- GRB 091020: Enhanced Swift-XRT position
- GRB 091020: Swift detection of a burst with an optical afterglow