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').
15 results found.
- GRB 150831A: optical upper limit ISON-SSO
- GRB 150309A: AAO optic upper limit
- Konus-Wind observation of GRB 150309A
- GRB 150309A: CrAO optic upper limit
- GRB 150309A: ISON-Kislovodsk optic upper limit
- GRB 150309A: Swift-BAT refined analysis
- GRB 150309A: Fermi GBM detection
- GRB150309A: Optical observations at Crni Vrh
- GRB 150309A: Swift/UVOT Upper Limits
- GRB 150309A: MASTER prompt optical observation
- GRB 150309A: Swift-XRT refined Analysis
- GRB 150309A : Liverpool Telescope observations
- GRB 150309A: Enhanced Swift-XRT position
- GRB 150309A: BOOTES-1 and -2 upper limit
- GRB 150309A: Swift detection of a burst