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"219 results found.
- GRB030329: XMM-Newton observation
- GRB 030227 optical afterglow
- GRB 030227: Confirmed Optical Afterglow (S1-A)
- GRB 030227: fading of candidate optical afterglow 'S1-A'
- GRB 030227, possible optical counterpart of XMM-Newton source
- GRB030227 - faint tentative OT candidate
- XMM-Newton observation of GRB030227
- GRB020410: BeppoSAX NFI observations refined analysis
- X-ray afterglow of GRB020321
- GRB 020322: BeppoSAX observations of the X-ray afterglow
- Near-Infrared Observations of GRB020322 at TIRGO
- GRB 020322 optical observation
- GRB 020322: Optical Sources and Improved Astrometry
- GRB020322, optical observations
- GRB 020322: Optical candidate
- XMM-Newton observation of GRB020322
- XMM-Newton observation of GRB011211
- CORRECTION to XMM-Newton observation of GRB001025
- XMM-Newton observation of GRB001025