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').
21 results found.
- GRB 201209A: Mondy optical observations, afterglow confirmation
- IceCube-201209A : MAXI/GSC upper limit
- GRB 201209A: Insight-HXMT/HE detection
- IceCube-201209A: Upper limits from Insight-HXMT/HE observations
- IceCube-201209: No significant detection in HAWC
- IceCube-201209A: No Candidate Counterparts from the Zwicky Transient Facility
- IceCube-201209A: Upper limits from a search for additional neutrino events in IceCube
- GRB 201209A: Swift/UVOT Upper Limits
- IceCube-201209A: Upper limits from Fermi-GBM Observations
- Fermi-LAT Gamma-ray Observations of IceCube-201209A
- IceCube-201209A: No neutrino counterpart candidates in ANTARES search
- GRB 201209A: Swift-BAT refined analysis
- IceCube-201209A: No counterpart candidates in INTEGRAL SPI-ACS and IBIS prompt observation
- GRB 201209A: Swift-XRT refined Analysis
- GRB 201209A: Xinglong-2.16m likely optical afterglow detection
- IceCube-201209A: IceCube observation of a high-energy neutrino candidate event
- GRB 201209A: AstroSat CZTI detection
- GRB 201209A: Enhanced Swift-XRT position
- GRB 201209A: KAIT Optical Upper Limit
- GRB 201209A: FRAM-Auger optical limit
- GRB 201209A: Swift detection of a burst