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"12 results found.
- Konus-Wind detection of GRB 241115D / EP 241115a
- GRB 241115A: CALET Gamma-Ray Burst Monitor detection
- GRB 241115a: PRIME near-infrared upper limits
- GRB 241115A: Swift-XRT afterglow detection
- GRB 241115A: Mephisto upper limits
- GRB 241115D / EP 241115a: SVOM/GRM observation
- GRB 241115A: Fermi GBM Observation
- GRB 241115A: LCOGT Optical Upper Limits
- Swift GRB 241115A: Global MASTER-Net observations report
- Fermi GRB 241115A: Global MASTER-Net observations report
- GRB 241115A: Swift detection of a burst
- GRB 241115A: Fermi GBM Final Real-time Localization