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"852 results found.
- MAXI/GSC detection of a short soft X-ray transient
- MAXI J1836-194 (originally GRB 110905A): Swift-BAT refined analysis
- GRB 110905A / X-ray transient MAXI J1836-194: TNT optical observation
- GRB 110905A: Potential BAT trigger on MAXI J1836-194
- GRB 110426A: Fermi GBM detection
- GRB 110426A: Swift/XRT non-detection
- GRB 110426A: MASTER synchronous with MAXI/GSC observations
- GRB 110426A: MAXI/GSC detection of a GRB
- GRB 110213B: Swift/UVOT observations
- GRB110213B: X-ray afterglow confirmation
- GRB 110213B: P60 Optical Afterglow Candidate
- GRB 110213B: Swift XRT observation
- Konus-Wind observation of GRB 110213B
- GRB 110213B: MAXI/GSC refined analysis
- GRB 110213B: MAXI/GSC detection of a probable GRB
- New feature in Fermi GBM GRB Ground Position Notices
- GRB 101225A: MAXI/GSC observations
- XRF 101117A, RIMOTS optical upper limits
- Swift detection of MAXIJ1409-619
- XRF 101117A: Palomar Transient Factory Observations
- GRB 101117B: Swift-BAT refined analysis
- XRF101117A: MAXI/GSC detection of a short X-ray transient
- GRB 100925A / MAXI J1659-152: MASTER optical observations
- GRB 100925A / MAXI J1659-152: WSRT Radio and Polarization Detection
- GRB 100925A / MAXI J1659-152: Optical observation with the Kottamia 188cm telescope
- 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
- SGR1806-20 bursts on 031008. Helicon detection and small error box.