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"20 results found.
- GRB 050730: Third Epoch WSRT Radio Observations
- GRB 050730: WSRT Radio Observations
- GRB 050730, optical observation
- GRB 050730: OHP optical observations
- GRB 050730: Preliminary Analysis of MIKE Spectrum
- GRB 050730, corrected photometry and break?
- GRB 050730: XRT refined analysis
- GRB 050730: early TAROT optical observations
- GRB 050730: RTT150 optical observations
- GRB 050730, spectra and optical photometry
- GRB050730: Refined BAT analysis of the Swift-BAT burst
- GRB 050730: Swift XRT afterglow observations
- GRB 050730 XMM-Newton observation
- GRB 050730: PROMPT VRcIc Observations
- GRB050730, afterglow observations
- GRB050730: confirmation of redshift
- GRB 050730: Redshift Measurement based on Magellan/MIKE Observations
- GRB 050730, SMARTS optical/IR afterglow observations
- GRB 050730 : Planned XMM-Newton observation
- GRB 050730, optical candidate