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.
Lucene Examples (click to copy):
subject:"Swift"body:"GRB"submitter:"Judith Racusin"18 results found.
- GRB 240727A: VIRT Optical Upper Limit
- GRB 240727A: Swift-BAT refined analysis
- GRB 240727A: observations of optical counterpart.
- Fermi GRB 240727A: Global MASTER-Net observations report
- GRB 240727A: Swift/UVOT detection
- GRB 240727A: Correction to time in GCN36960
- GRB 240727A: Osservatorio Astronomico Nastro Verde upper limit
- GRB 240727A: NOT optical observation
- GRB 240727A: JinShan optical upper limits
- GRB 240727A Bassano Bresciano Observatory upper limit
- GRB 240727D: Correction to the GRB name in GCN 36958
- GRB 240727A: Fermi GBM Final Real-time Localization
- GRB 240727A: Swift-XRT refined Analysis
- GRB 240727A: Enhanced Swift-XRT position
- GRB240727A: Skynet Optical Afterglow Observations
- GRB 240727A: TRT optical afterglow detection
- GRB 240727A: KAIT Optical Afterglow Candidate
- GRB 240727A: Swift detection of a burst