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 101219B: tentative redshift and spectroscopic supernova detection
- GRB 101219B: GROND detection of a SN signature
- GRB 101219B: correction
- GRB 101219B: Likely the GRB host emission dominates now in the uvw2 filter
- GRB 101219b. Possible radio afterglow detection.
- GRB 101219B: After 2 weeks still detected by Swift/UVOT
- GRB 101219B: Swift/UVOT refined analysis
- GRB 101219B: Swift-XRT refined Analysis
- GRB 101219B: Enhanced Swift-XRT position
- GRB 101219B: GROND Detection of the Optical/NIR Afterglow
- GRB 101219B: Fermi GBM observation
- GRB 101219B: Swift-BAT refined analysis
- GRB 101219B: Swift detection of a burst with an optical afterglow