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.
To navigate to a specific circular, enter the associated Circular ID (e.g. 'gcn123', 'Circular 123', or '123').
774 results found.
- Swift Detection of MAXI J1803-298 including an optical counterpart
- MAXI GRB210501.83: Global MASTER-Net observations report
- MAXI GRB210320.89: Global MASTER-Net observations report
- GRB 210320A: MAXI/GSC detection
- Konus-Wind detection of GRB 210222A
- GRB 210222A: CALET Gamma-Ray Burst Monitor detection
- GRB 210222A: MAXI/GSC detection
- SGR 1935+2154: MAXI/GSC detection
- NuEm-210111A: MAXI/GSC upper limit
- MAXI GRB210110.64: Global MASTER-Net observations report
- GRB 210110A: MAXI/GSC detection
- GRB 210109A: MAXI/GSC detection
- GRB 210102B: further Swift-XRT observations
- GRB 210102B: Assy optical afterglow identification
- GRB 210104A: Swift/UVOT Detection
- GRB 210102B: Tiled Swift observations
- GRB 210102B: Assy optical observations
- GRB 210102B: Swift-XRT observations
- MAXI GRB210102.38: Global MASTER-Net observations report
- GRB 210102B: Tiled Swift observations
- GRB 210102B: MAXI/GSC detection
- IceCube-201209A : MAXI/GSC upper limit
- MAXI GRB201021.68: Global MASTER-Net observations report
- GRB 201021B MAXI/GSC detection
- GRB 200903D: MAXI/GSC detection
- GRB 200809B: Fermi GBM detection
- GRB 200809B: Swift-XRT afterglow detection
- GRB 200809B: MAXI/GSC detection
- GRB 200615B: CALET Gamma-Ray Burst Monitor detection
- GRB 200615B: MAXI/GSC detection
- GRB 200517A: Swift-XRT Confirmation of afterglow
- Fermi GBM Sub-Threshold Detection of GRB 200517A
- GRB 200517A: Swift-XRT afterglow detection
- GRB 200514A: AstroSat CZTI detection
- GRB 200517A: Tiled Swift observations
- GRB 200517A: MAXI/GSC detection
- GRB 200514A: MITSuME Akeno optical upper limits
- GRB 200514A: CALET Gamma-Ray Burst Monitor detection
- GRB 200514A: MAXI/GSC detection
- Konus-Wind observation of a very intense bursting activity of SGR 1935+2154
- SGR 1935+2154: MAXI/GSC detection
- GRB 200320B: MAXI/GSC detection
- LIGO/Virgo S200316bj: Coverage and upper limits from MAXI/GSC observations
- LIGO/Virgo S200311bg: Coverage and upper limits from MAXI/GSC observations
- GRB 200310A: MAXI/GSC detection
- LIGO/Virgo S200302c: Coverage and upper limits from MAXI/GSC observations
- LIGO/Virgo S200225q: Coverage and upper limits from MAXI/GSC observations
- LIGO/Virgo S200224ca: Coverage and upper limits from MAXI/GSC observations
- LIGO/Virgo S200219ac: Coverage and upper limits from MAXI/GSC observations
- LIGO/Virgo S200213t: Coverage and upper limits from MAXI/GSC observations
- LIGO/Virgo S200208q: Coverage and upper limits from MAXI/GSC observations
- GRB 200205A = Swift J0840.7-3516, A newly discovered transient X-ray Pulsar
- GRB 200205A / Swift trigger 954304: VLT optical observations
- GRB 200205A: MAXI/GSC detection
- MAXI GRB200205.29: Global MASTER-Net observations report
- LIGO/Virgo S200129m: Coverage and upper limits from MAXI/GSC observations
- LIGO/Virgo S200128d: Coverage and upper limits from MAXI/GSC observations
- IceCube-200117A: No Neutrino Counterpart in ANTARES data
- LIGO/Virgo S200115j: Coverage and upper limits from MAXI/GSC observations
- LIGO/Virgo S200114f: Coverage and upper limits from MAXI/GSC observations
- LIGO/Virgo S200112r: Coverage and upper limits from MAXI/GSC observations
- LIGO/Virgo S200105ae: Coverage and upper limits from MAXI/GSC observations
- GRB 200105A: MAXI/GSC detection
- LIGO/Virgo S191222n: Coverage and upper limits from MAXI/GSC observations
- LIGO/Virgo S191216ap: Coverage and upper limits from MAXI/GSC observations
- LIGO/Virgo S191215w: Coverage and upper limits from MAXI/GSC observations
- LIGO/Virgo S191213g: Coverage and upper limits from MAXI/GSC observations
- LIGO/Virgo S191205ah: Coverage and upper limits from MAXI/GSC observations
- LIGO/Virgo S191204r: Coverage and upper limits from MAXI/GSC observations
- LIGO/Virgo S191129u: Coverage and upper limits from MAXI/GSC observations
- LIGO/Virgo S191110af: Coverage and upper limits from MAXI/GSC observations
- LIGO/Virgo S191109d: Coverage and upper limits from MAXI/GSC observations
- LIGO/Virgo S191105e: Coverage and upper limits from MAXI/GSC observations
- LIGO/Virgo S190930t: Coverage and upper limits from MAXI/GSC observations
- LIGO/Virgo S190930s: Coverage and upper limits from MAXI/GSC observations
- LIGO/Virgo S190924h: Coverage and upper limits from MAXI/GSC observations
- LIGO/Virgo S190923y: Coverage and upper limits from MAXI/GSC observations
- LIGO/Virgo S190915ak: Coverage and upper limits from MAXI/GSC observations
- LIGO/Virgo S190910h: Coverage and upper limits from MAXI/GSC observations
- Swift Trigger 924641 is an outburst from MAXI J1807+132
- LIGO/Virgo S190910d: Coverage and upper limits from MAXI/GSC observations
- GRB 190823A: Swift-XRT afterglow detection
- LIGO/Virgo S190901ap: Coverage and upper limits from MAXI/GSC observations
- GRB 190828A: Swift-XRT observations
- GRB 190828A: Tiled Swift observations
- LIGO/Virgo S190828l: Coverage and upper limits from MAXI/GSC observations
- LIGO/Virgo S190828j: Coverage and upper limits from MAXI/GSC observations
- GRB 190828A: MAXI/GSC detection
- GRB 190823A: Swift-XRT observations
- GRB 190823A: Tiled Swift observations
- GRB 190823A: MAXI/GSC detection
- Fermi GBM-190816: Coverage and upper limits from MAXI/GSC observations
- LIGO/Virgo S190814bv: Coverage and upper limits from MAXI/GSC observations
- IPN triangulation of GRB 190805B
- LIGO/Virgo S190808ae: Coverage and upper limits from MAXI/GSC observations
- GRB 190805B: AstroSat CZTI detection
- GRB 190804B: Swift-XRT afterglow detection
- Konus-Wind observation of GRB 190805B
- GRB 190805B: Swift-XRT observations
- GRB 190805B: Fermi GBM detection