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"919 results found.
- GRB 090831A: IPN Triangulation
- GRB 090831: MAXI GSC detection
- GRB090426 Swift/UVOT observations
- GRB 090102: Swift XRT refined analysis
- Swift UVOT observations of GRB 081203A
- UVOT/Swift observations of GRB081105
- GRB 080319B: UVOT Observations
- Detailed Spectroscopic ID of SN 2008D (Transient in NGC 2770)
- GRB 071112C: Optical and NIR data observed with KANATA
- GRB 071112C: Swift/UVOT observations
- GRB 070810b: Image Subtraction of Multiple Keck Observations
- GRB 060929: Swift/UVOT Optical Observations
- A dust-scattering halo detected around SGR 1806-20
- GRB 051109B: Bright spiral host galaxy at low redshift
- SN 2003dh/GRB030329 late-time optical spectroscopy
- IPN triangulation of GRB030726 (large error box)
- GRB020127 Optical Observations
- GRB971227: Plaskett R-band observations
- GRB 971227: Optical clarifications