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').
774 results found.
- GRB 180923A: MASTER inspection MAXI/GSC error box
- GRB 180923A: MAXI/GSC detection
- GRB 180829A: Swift-XRT observations
- GRB 180829A: Tiled Swift observations
- GRB 180829A/MAXI J0406-019: MAXI/GSC detection
- GRB 180809A: further Swift/XRT observations
- GRB 180809A: Fermi GBM observation
- GRB 180809A: CALET Gamma-Ray Burst Monitor detection
- GRB 180809A: Swift-XRT afterglow detection
- GRB 180809A: Tiled Swift observations
- GRB 180809A: MAXI/GSC detection
- GRB 180701A/MAXI J2119-045: CALET Gamma-Ray Burst Monitor data search
- GRB 180720B: CALET Gamma-Ray Burst Monitor detection
- GRB 180722A: Swift-XRT observations
- GRB 180722A: MASTER second inspection
- GRB 180720B: MASTER Global Net OT observations
- GRB 180720B: ISON-Castelgrande optical observations
- GRB 180722A: Tiled Swift observations
- GRB 180722A: MASTER optical observation
- GRB 180722A: MAXI/GSC detection
- GRB 180720B: MAXI/GSC detection
- GRB 180706A: Swift/UVOT Detection
- Konus-Wind observation of GRB 180701A
- GRB 180701A: MAXI/GSC detection
- GW170817/GRB170817A: LBT optical detection
- Swift trigger 831888: misidentification of 4U 1416-62
- Fermi GBM triggers 544628550/180405571, 544542853/180404579, 544531428/180404447 are not GRBs
- Fermi GBM triggers 544440014/180403389 and 544451446/180403521 are not GRBs
- GRB 180402A, Swift-BAT refined analysis
- GRB 180402A: Swift detection of a possibly short burst
- Swift Trigger 819301: possible GRB 180329A
- Konus-Wind observation of GRB 180326A
- IBAS Alert n. 8033: Not a GRB
- IBAS Alert n. 8032: Not a GRB
- Swift Trigger on MAXI J1820+070
- Trigger 814090: Swift detection of MAXI J1820+070
- MAXI J1820+070: Swift/UVOT counterpart correction
- Swift detection of MAXI J1820+070
- MAXI J1813-095 source: AbAO optical observations
- Swift Trigger 811167: Detection of MAXI J1813-095
- GRB 180116A: Fermi GBM Detection
- GRB 180116A: MAXI/GSC detection
- GRB 171216A: Swift/UVOT Upper Limits
- GRB 171112A: Fermi GBM Detection
- Konus-Wind observation of GRB 171112A
- GRB 171112A: MAXI/GSC detection
- Fermi-GBM Detection of possible burst from AXP CXOU J164710.2-455216/PSR J1647-4552
- Swift Trigger 775946 is a Galactic transient, not GRB 171003
- GRB 170911A: Fermi GBM observation
- GRB 170911A: MAXI/GSC detection
- IBAS Alert nr. 7913 is not a real GRB
- Swift Triggered on MAXI J1535-571
- Swift Trigger on continued activity of MAXI J1535-571
- Swift Triggers on MAXI J1535-571
- Swift Trigger 770431 (GRB 170902A) is a not a GRB
- GRB 170830A: Fermi GBM observation
- GRB 170830A: Astrosat CZTI detection
- GRB 170830A: iTelescope optical observations
- GRB 170830A: MAXI/GSC detection
- LIGO/Virgo G299232 : MAXI/GSC observations
- LIGO/Virgo G298936 : MAXI/GSC observations
- LIGO/Virgo G298389 : MAXI/GSC observations
- LIGO/Virgo G298048, Fermi GBM trigger 524666471/170817.529: MAXI/GSC observations
- LIGO/Virgo G297595 : MAXI/GSC observations
- LIGO/Virgo G296853 : MAXI/GSC observations
- GRB 170808A: MAXI/GSC detection
- GRB 170610A: MAXI/GSC detection
- LIGO/Virgo G288732 : MAXI/GSC observations
- GRB 170511A: AstroSat CZTI detection
- GRB 170511A: Fermi GBM observation
- GRB 170511A: MAXI/GSC detection
- LIGO/Virgo G284239: MAXI/GSC observations
- LIGO/Virgo G277583 : MAXI/GSC observations
- LIGO/Virgo G275697: MAXI/GSC observations
- LIGO/Virgo G274296 and G275404 : MAXI/GSC observations
- LIGO/Virgo G270580: MAXI/GSC observations
- LIGO/Virgo G268556/GW170104: MAXI/GSC observations
- Trigger 731183: Swift detection of GRS 1716-249/GRO J1719-24/V2293 Oph
- GRS 1716-249/GRO J1719-24/V2293 Oph, Swift-BAT refined analysis
- IceCube-161210: MAXI/GSC non-detection
- GRB 161123A: Swift-XRT observations
- GRB 161123A: Tiled Swift observations
- GRB 161123A: MAXI/GSC detection
- Konus-Wind observation of GRB 160814A
- GRB 160814A: MAXI/GSC detection
- SGR 1935+2154: CALET Gamma-Ray Burst Monitor detections
- GRB 160705A/MAXI J0748-149: MAXI/GSC detection
- More FERMI GBM bursts from the magnetar SGR 1935+2154
- SGR 1935+2154: MAXI/GSC detection
- Konus-Wind observation of GRB 160509A
- GRB 160509A: DCT Imaging / Afterglow Confirmation
- GRB 160509A: MAXI/GSC refined analysis
- GRB 160509A: Fermi GBM Detection
- GRB 160509A: optical observations
- Correction to GCN 19404; GRB 160509A: MAXI/GSC detection
- GRB 160227A: MAXI/GSC detection
- GRB 160327A: Swift/UVOT Upper Limits
- GRB 160227A: MAXI/GSC detection
- LIGO/Virgo G184098: MAXI/GSC search for an X-ray counterpart of GW150914
- GRB 160206A: Swift/UVOT observations