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').
20 results found.
- IceCube-201221A: Upper limits from a search for additional neutrino events in IceCube
- IceCube-201221A: No significant detection in HAWC
- GRB 201221A: Konus-Wind detection and joint Konus-Wind + Swift-BAT spectral analysis
- GRB 201221A: REM early-time afterglow detection
- IceCube-201221A: Upper limits from Insight-HXMT/HE observations
- Fermi-LAT Gamma-ray Observations of IceCube-201221A
- GRB 201221A: Swift-BAT refined analysis
- correction to GCN 29110 - Fermi GBM Sub-Threshold Detection of GRB 201221A
- Fermi GBM Sub-Threshold Detection of GRB 201221A
- GRB 201221A: Swift/UVOT Upper Limits
- GRB 201221A: Swift-XRT refined Analysis
- GRB 201221A: Enhanced Swift-XRT position
- IceCube-201221A: not observable by Fermi-GBM
- IceCube-201221A: No counterpart candidates in INTEGRAL SPI-ACS and IBIS prompt observation
- IceCube-201221A: IceCube observation of a high-energy neutrino candidate event
- GRB 201221A: VLT/X-shooter afterglow discovery and spectroscopic redshift z = 5.7
- GRB 201221A: FRAM-Auger optical limit
- Swift GRB 201221A: Global MASTER-Net observations report
- GRB 201221A: Prompt enhanced Swift-XRT position
- GRB 201221A: Swift detection of a burst