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 100728B: X-shooter redshift
- GRB 100728B: optical photometry of ISON-NM
- GRB 100728B: Swift/UVOT Observations (correction to GCN 11028)
- GRB 100728B: Swift/UVOT Observations (correction)
- GRB 100728B - NOT optical observation
- GRB 100728B: Swift/UVOT Observations
- GRB 100728B: Lick Observations
- GRB 100728B: Continued KAIT observations
- GRB 100728B, Swift-BAT refined analysis
- GRB 100728B: Swift-XRT Refined Analysis
- GRB 100728A: GROND Detection of the NIR Afterglow Candidate
- GRB 100728B: Enhanced Swift-XRT position
- GRB 100728B: Fermi GBM observation
- GRB 100728B: GROND Detection of the NIR Afterglow
- GRB 100728B: optical detection
- GRB 100728B: Skynet/PROMPT Detections (correction)
- GRB 100728B: KAIT optical afterglow detection (correction)
- GRB 100728B: Swift detection of a burst with an optical counterpart