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"15 results found.
- GRB 250109A / EP250109a: GRBAlpha detection
- GRB 250109A / EP250109a: Mephisto optical upper limits
- EP250109a/GRB 250109A:SVOM/VT optical counterpart
- GRB 250109A / EP250109a: Terskol (INASAN) and SAO RAS observations
- GRB 250109A / EP250109A: Swift/BAT-GUANO localization skymap of a burst
- GRB 250109A / EP250109a: Swift detection of the X-ray afterglow
- EP250109a / GRB 250109A: refined EP-WXT analysis and EP-FXT follow-up observation
- GRB 250109a: GMG Optical Upper Limit
- EP250109a: Swift/UVOT non-detection
- GRB 250109A /EP250109a: Fermi GBM Final Localization
- EP250109a: SVOM/VT optical candidate
- EP250109a: Global MASTER-Net observations report
- EP250109a: GOTO optical upper limits
- EP250109a: Swift/XRT non-detection
- EP250109a: EP-WXT detection of an X-ray transient