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').
21235 results found.
- Fermi GRB 240213A: Global MASTER-Net observations report
- GRB 240213A: Fermi GBM Final Real-time Localization
- GRB 240209A: GOTO optical counterpart candidate
- Konus-Wind detection of GRB 240204A
- Konus-Wind detection of GRB 240205A (short)
- GRB 240209A: Fermi GBM Final Localization
- Fermi trigger No 729152364: Global MASTER-Net observations report
- IPN triangulation of GRB 240205A (short)
- GRB 240205B: PRIME near infrared detection
- GRB 240205A (short): Glowbug gamma-ray detection
- Swift Trigger 1213872 is not an astrophysical event
- GRB240204A: Swift/UVOT Upper Limits
- GRB 240205B: AstroSat CZTI detection
- Fermi trigger No 729012023: Global MASTER-Net observations report
- GRB 240205B: Swift-BAT refined analysis
- GRB 240207A: Fermi GBM Final Real-time Localization
- Konus-Wind detection of GRB 240125A
- GRB 240205B: VLT/X-shooter redshift
- GRB 240205B: CALET Gamma-Ray Burst Monitor detection
- GRB 240205B: BOOTES-6 optical afterglow follow-up
- GRB 240205B: ATCA detection of radio counterpart
- GRB 240205B: REM detection of the optical/NIR afterglow
- GRB 240205B: Fermi GBM Observation
- GRB 240205B: GECAM detection of a long burst
- GRB 240204A: Swift-BAT refined analysis
- GRB 240205B: Skynet Optical Afterglow Observations
- GRB 240205B: BOOTES-7 optical afterglow follow-up
- Fermi trigger No 728749569: Global MASTER-Net observations report
- GRB 240205B: MASTER OT J232550.14-550704.6 counterpart detection
- GRB 240205B: Swift detection of a burst
- GRB 240205B: Fermi GBM Final Real-time Localization
- Swift GRB240205.93: Global MASTER-Net observations report
- GRB 240204A: Fermi GBM Observation
- GRB 240205A: Fermi GBM Final Real-time Localization
- GRB 240204A: Osservatorio Astronomico Nastro Verde upper limit
- Fermi Gamma-ray Burst Monitor trigger 728740048/240204491 is not a GRB
- Fermi trigger No 728796365: Global MASTER-Net observations report
- Fermi Gamma-ray Burst Monitor trigger 728706420/240204102 is not a GRB
- Fermi GRB 240204A: Global MASTER-Net observations report
- Fermi trigger No 728706420: Global MASTER-Net observations report
- GRB 240204A: Swift detection of a burst
- GRB 240204A: Fermi GBM Final Real-time Localization
- IceCube Alert 240204.38: Global MASTER-Net observations report
- Swift Trigger 1212791 is not an astrophysical event.
- Swift-BAT triggers 1212787, 1212789 are not astrophysical.
- GRB 230812B: Update on Bad Time Intervals for Fermi GBM data
- IPN triangulation of GRB 240124B
- GRB 240129A: Fermi GBM Observation
- IPN triangulation of GRB 240125B (short)
- GRB 240129A: Swift/BAT-GUANO detection of a burst outside the coded FOV
- IPN triangulation of GRB 240125A (short)
- GRB 240128A: Glowbug gamma-ray detection
- GRB 240128A: GRBAlpha detection
- GRB 240125A: GRBAlpha detection
- Fermi GRB 240127A: Global MASTER-Net observations report
- GRB 240127A: Fermi GBM Final Real-time Localization
- Swift Trigger 1211211 and 1211212 are not astrophysical
- GRB 240123C: AstroSat CZTI detection
- GRB 240125B: Fermi GBM Final Localization
- GRB 240123B: Fermi GBM Observation
- GRB 240123A: Glowbug gamma-ray detection
- GRB 240125A (short): Glowbug gamma-ray detection
- GRB 240123B: Swift/BAT-GUANO detection of a long burst
- GRB 240123A: GRBAlpha detection
- IPN triangulation of GRB 240123C (short)
- Swift trigger 1210856 is not astrophysical
- GRB 240123A: Swift-BAT refined analysis
- IceCube Alert 240123.48: Global MASTER-Net observations report
- GRB 240123A : MITSuME Akeno optical afterglow candidate detection
- Fermi/GBM trigger 727752941: BALROG analysis retraction
- GRB 240124A?: BALROG localization (Fermi Trigger 727752941 / GRB 240124066)
- Fermi GRB 240123B: Global MASTER-Net observations report
- GRB 240122A: Swift/UVOT Upper Limits
- GRB 240123A: Swift-XRT refined Analysis
- GRB 240122A: BOOTES-2/TELMA optical upper limit and 1.5m OSN detection
- Fermi GBM Sub-Threshold Detection of GRB 240123A
- GRB 240123B: Fermi GBM Final Real-time Localization
- GRB 240118A: Swift/UVOT Upper Limits
- GRB 240122B: Glowbug gamma-ray detection
- GRB 240123A: Swift detection of a burst with a possible optical counterpart
- Swift GRB240123.46: Global MASTER-Net observations report
- GRB 240122A: VLT/X-shooter redshift confirmation
- GRB 240122A: LT non-detection of GOTO candidate counterpart confirms fading
- GRB 240122A: GOTO optical counterpart candidate
- IPN triangulation of GRB 240119A (short)
- GRB 240118C: GECAM-B detection of a long burst
- GRB 240118A: Mondy optical observations
- GRB 240118C: Fermi GBM Observation
- Fermi GRB 240119A: Global MASTER-Net observations report
- GRB 240119A: Fermi GBM Final Localization
- GRB 240118C: Swift/BAT-GUANO detection of a burst
- GRB 240118A: GRBAlpha detection
- GRB 240115A: Fermi GBM Observation
- Swift triggers 1209631, 1209632, 1209635 and 1209644 are not interesting astrophysical events
- GRB 240118C: Fermi GBM Final Localization
- GRB 240118D: AstroSat CZTI detection
- GRB 240117A: AstroSat CZTI detection
- GRB 240118A: AbAO optical upper limit
- Fermi GRB 240118B: Global MASTER-Net observations report
- GRB 240118A: NuSTAR Offline Analysis of the GRB