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').
10 results found.
- GRB 140428A: GROND afterglow confirmation
- GRB 140428A: GROND observations
- GRB 140428A: Swift/UVOT Upper Limits
- GRB 140428A: Swift-BAT refined analysis
- GRB 140428A: 1.5m OSN I-band detection
- GRB 140428A: Keck redshift estimate
- GRB 140428A: Keck detection of a red optical afterglow candidate
- GRB 140428A: NOT observations
- GRB 140428A: Swift-XRT detection of a source
- GRB 140428A: Swift Detection of a Possible Burst