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"923 results found.
- Short X-ray Transient detected by MAXI/GSC
- XRF 100315A: MAXI/GSC detection of a short X-ray transient
- GRB 100206A: Fermi GBM observation
- Short X-ray Transient detected by MAXI/GSC
- Short X-ray Transient, RIMOTS optical upper limits
- Short X-ray Transient Detection by MAXI/GSC
- IPN Triangulation of GRB091120
- Konus-Wind observation of GRB 091120
- GRB 091120: MAXI GSC detection
- GRB 090926B: MAXI GSC detection
- GRB 090831A: Suzaku WAM observation of the prompt emission
- GRB 090831A: IPN Triangulation
- GRB 090831: MAXI GSC detection
- GRB 090814C: Fermi GBM detection
- GRB 090813: Fermi GBM observation
- GRB 090728: Swift/UVOT Upper Limits
- GRB 090718B: Fermi GBM detection
- GRB 090222: Fermi GBM detection
- GRB081104: Swift/UVOT Upper Limits
- GRB 080928: Swift/UVOT observations
- GRB 060510B: Swift/UVOT Upper Limits
- GRB 050904: TAROT optical measurements
- HST/STIS observations of the host galaxy of GRB 980329