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"827 results found.
- GRB100925A/MAXI J1659-152: X-shooter identification as an X-ray binary
- GRB100925A/MAXI J1659-152 MITSuME Ishigakijima and Okayama Optical Observation
- GRB 100925A / MAXI J1659-152: SARA-S Observations
- GRB 100925A/MAXI J1659-152: Submm observations from APEX
- GRB100925A/MAXI J1659-152: Galactic origin from SED analysis
- GRB 100925A/MAXI J1659-152 - NOT optical observations
- GRB 100925A / MAXI J1659-152: BOOTES-2/TELMA and IAC80 optical observations
- MAXI J1659-152: Swift-BAT refined analysis (triggers 434928 and 434931)
- GRB 100823A: MAXI/GSC detection
- XRF 100701A : MAXI/GSC detection of a probable XRF
- XRF 100616a : MAXI/GSC detection of a probable XRF
- GRB 100510A: Fermi GBM detection/observation
- GRB 100510A: MAXI/GSC detection
- GRB 100415A: MAXI/GSC detection of a probable GRB
- Short X-ray Transient detected by MAXI/GSC
- XRF 100315A: MAXI/GSC detection of a short X-ray transient
- 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 991208: HST Imaging of the Host Galaxy