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').
24 results found.
- MeerKAT observation of GRB 191221B
- GRB 191221B: CALET Gamma-Ray Burst Monitor detection
- GRB 191221B: ATCA detection of the radio afterglow
- Konus-Wind observation of GRB 191221B
- GRB 191221B: Swift/UVOT Detection
- GRB 191221B: Insight-HXMT/HE detection
- GRB 191221B: AstroSat CZTI detection
- GRB 191221B: iTelescope T17 detection
- GRB 191221B: iTelescope optical observations
- GRB 191221B: ALMA detection
- GRB 191221B: Swift-BAT refined analysis
- GRB 191221B: Zadko observatory - Gingin optical observations
- GRB 191221B: LCO Optical Detection
- GRB 191221B: Swift-XRT refined Analysis
- GRB 191221B: MASTER VWFC OT yearly detection
- GRB 191221B: VLT/X-shooter redshift
- GRB 191221B: Correction to GCN26551 - VIRT OT observation
- GRB 191221B: VIRT Optical Upper Limits
- GRB 191221B: AGILE/MCAL observations
- GRB 191221B: Enhanced Swift-XRT position
- GRB 191221B: Swift/UVOT redshift
- GRB 191221B: MASTER OT detection
- Swift GRB 191221B: Global MASTER-Net observations report
- GRB 191221B: Swift detection of a burst and a very bright optical candidate