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').
9 results found.
- GRB 120521B: Fermi GBM observation
- GRB 120521B: Swift/UVOT Upper Limits
- GRB 120521B: GROND Upper limits
- GRB 120521B: Swift-BAT refined analysis
- GRB 120521B: Swift-XRT refined Analysis
- GRB 120521B: Enhanced Swift-XRT position
- GRB 120521B/Fermi Trigger 359284074: early MASTER-ICATE optical limit
- GRB 120521B: TAROT La Silla observatory optical observations
- GRB 120521B: Swift detection of a burst