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"4022 results found.
- Distribution of INTEGRAL SPI-ACS triggers for GRB bursts
- Distribution of INTEGRAL SPI-ACS triggers
- GRB021016(=H2397): A Long GRB Localized by HETE
- GRB 021004: Optical observations, AUDE network
- IPN GCN Circulars now to be issued without restriction
- GRB/XRF 020427, detection of an underlying system with the VLT
- HETE Fully-Automated GCN Notices
- Congratulate Scott on the 1000th GRB Coordinates Network Circular!
- HETE Status
- HETE positions added to GCN
- RE: Budget cuts in BeppoSAX operations: impact on GRB observation
- GRB000301c results
- Optical observations of GRB000301c
- GCN resumes full operations
- X-ray/GRB 1SAX J0835.9+5118, Optical Observations
- BeppoSAX: A new fast X-ray transient
- GRB 990506, Optical Observations
- GRB 990123: near-infrared observations.
- GRB981226, BeppoSAX Christmas GRB
- GRB980515, BeppoSAX IAUC to be submitted
- IPN web site of GRBs
- GRB980329, Fading IR counterpart to radio source