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').
17435 results found.
- GRB 240218A: Fermi GBM Detection
- GRB 240215A: Fermi GBM Observation
- GRB 240215B: GRBAlpha detection
- IPN triangulation of GRB 240209A
- GRB 240218A: Enhanced Swift-XRT position
- GRB 240218A: REM detection of a NIR afterglow candidate
- GRB 240218A: Swift detection of a burst
- Swift GRB240218.08: Global MASTER-Net observations report
- GRB 240215B: Swift/BAT-GUANO detection of a burst outside the coded FOV
- Swift Triggers 12156887-1215690 are not astrophysical events.
- GRB 240215A: Tiled Swift observations
- GRB 240215A: Swift/BAT-GUANO localization of a burst
- GRB 240128A: Further Swift-XRT observations
- GRB 240214A: Tiled Swift observations
- GRB 240214A/1H 0451-560: MAXI/GSC detection
- Konus-Wind detection of GRB 240204A
- IPN triangulation of GRB 240205A (short)
- GRB 240205B: PRIME near infrared detection
- Swift Trigger 1213872 is not an astrophysical event
- GRB240204A: Swift/UVOT Upper Limits
- GRB 240205B: AstroSat CZTI detection
- GRB 240205B: Swift-BAT refined analysis
- Konus-Wind detection of GRB 240205B (long / very soft)
- 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 240204A: AstroSat CZTI detection
- 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
- GRB 240205B: MASTER OT J232550.14-550704.6 counterpart detection
- GRB 240205B: Swift detection of a burst
- Swift GRB240205.93: Global MASTER-Net observations report
- GRB 240204A: Fermi GBM Observation
- GRB 240204A: Osservatorio Astronomico Nastro Verde upper limit
- GRB 240204A: optical afterglow detection with LCOGT 1m telescopes at Sutherland and Teide Observatories
- GRB 240204A: Montarrenti Observatory optical observations
- GRB 240204A: Enhanced Swift-XRT position
- GRB 240204A: Mondy optical afterglow candidate
- GRB 240204A: Swift detection of a burst
- Swift Trigger 1212791 is not an astrophysical event.
- Swift-BAT triggers 1212787, 1212789 are not astrophysical.
- IPN triangulation of GRB 240124B
- GRB 240129A: Fermi GBM Observation
- GRB 240129A: Swift/BAT-GUANO detection of a burst outside the coded FOV
- IPN triangulation of GRB 240125A (short)
- GRB 240128A: Swift-XRT observations
- GRB 240128A: Tiled Swift observations
- GRB 240122A: ATCA detection of radio counterpart
- Swift Trigger 1211211 and 1211212 are not astrophysical
- GRB 240123C: AstroSat CZTI detection
- GRB240122A: PRIME near infrared detection
- GRB 240123B: Fermi GBM Observation
- GRB 240123A: 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
- GRB 240123A : MITSuME Akeno optical afterglow candidate detection
- GRB 240123A: Enhanced Swift-XRT position
- 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 240118A: Swift/UVOT Upper Limits
- GRB 240123A: Swift detection of a burst with a possible optical counterpart
- Swift GRB240123.46: Global MASTER-Net observations report
- GRB 240122A: Swift-XRT afterglow detection
- GRB 240122A: Tiled Swift observations
- IPN triangulation of GRB 240119A (short)
- GRB 240118C: GECAM-B detection of a long burst
- GRB 240118A: Mondy optical observations
- GRB 240118A: Swift-XRT afterglow detection
- GRB 240118C: Fermi GBM Observation
- 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 240118A: Swift ToO observations
- GRB 240118A: AbAO optical upper limit
- GRB 240118A: NuSTAR Offline Analysis of the GRB
- GRB 240118A: Swift/BAT-GUANO detection of a burst outside the coded FOV
- GRB 240118A: Fermi-LAT detection
- GRID detection of GRB 231230A
- GRB 240115A: Swift/BAT-GUANO detection of a short burst
- Swift Trigger 1209406 is not an astrophysical event
- Swift Triggers 1209401 and 1209403 are not astrophysical events
- IPN triangulation of GRB 240112A (long)
- Swift Triggers 1209371 through 1209374 are not astrophysical events
- Swift Triggers 1209369 and 1209370 are not astrophysical events
- LIGO/Virgo/KAGRA S240109a: Upper limits from Swift/BAT-GUANO
- GRB 240112C: Glowbug gamma-ray detection
- GRB 240112C: VZLUSAT-2 detection
- Konus-Wind detection of GRB 240112C
- GRB 240112C: GRBAlpha detection