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').
22279 results found.
- X-ray transient EP 240315a: Second epoch Chandra observations
- X-ray transient EP240315a: Ondrejov D50 optical limit
- Transient EPW20240219aa: REM optical/NIR further observations
- GRB 240320A: Glowbug gamma-ray detection
- GRB 240318A: Fermi GBM Observation
- GRB 240318A: Swift/BAT-GUANO detection of a burst outside the coded FOV
- X-ray transient EP240315a: ATCA detection of radio counterpart
- IPN triangulation of GRB 240315C (consistent with a fast X-ray transient EP240315a)
- GRB 240317B: Swift/BAT-GUANO Angular Error Correction
- X-ray transient EP240315a: MeerKAT radio detection
- GRB 240318A: Glowbug gamma-ray detection
- GRB 240317C: Glowbug gamma-ray detection
- GRB 240318B: Glowbug gamma-ray detection
- X-ray transient EP240315a: PRIME near infrared detection
- GRB 240317B: Fermi GBM Observation
- X-ray transient EP240315a: 3.6 m TNG NIR detection
- X-ray transient EP240315a/AT2024eju: TShAO (Zeiss-1000) observatory optical upper limit
- GRB 240317B: Swift/BAT-GUANO arcminute localization of a burst
- X-ray transient EP240315a: Kitab observatory optical upper limitns
- X-ray transient EP240315a: Montarrenti Observatory optical upper limit
- X-ray transient EP240315a: orphan FXT?
- X-ray transient EP240315a: Kinder follow-up observations for AT 2024eju with Lulin observatory
- X-ray transient EP240315a: VLT/X-shooter spectroscopic redshift of z = 4.859
- X-ray transient EP240315a: Nanshan/HMT optical upper limit
- AT2024eju: followup observations with Liverpool Telescope suggest a fading transient
- Einstein Probe detected of a fast X-ray transient EP240315a
- Changes to the Fermi-GBM Triggering Thresholds
- GRB240204A: VIRT optical upper limit
- GRB 240312A: Glowbug gamma-ray detection
- GRB 240312A: GECAM detection of a long burst
- GRB 240303C: VZLUSAT-2 detection
- Fermi-LAT gamma-ray observations of IceCube-240307A
- GRB 240310B: Glowbug gamma-ray detection
- GRB 240309A: MAXI/GSC detection
- Swift Trigger 1219325 is not a GRB
- IceCube-240307A: Upper limits from a search for additional neutrino events in IceCube
- GRID detection of GRB 240229A (Updated Report)
- GRID detection of GRB 240229A
- GRB 231215A: further radio observations with the VLA
- GRB 240306A: Fermi GBM observation
- GRB 240229A: Glowbug gamma-ray detection
- GRB 240227A (short): Glowbug gamma-ray detection
- Fermi GRB 240305A: Global MASTER-Net observations report
- GRB 240306A: Swift/BAT-GUANO detection of a burst
- GRB 240305A: Fermi GBM observation
- Fermi-LAT gamma-ray observations of IceCube-240229A
- GRB 240305A: Swift/BAT-GUANO arcminute localization of a burst
- GRB 231028C: Glowbug gamma-ray confirmation of a prior burst
- GRB 240218A: ALMA detection
- GRB 240303B: VZLUSAT-2 detection
- GRB 240229A: VZLUSAT-2 detection
- Swift Trigger 1218701: Yes, we triggered on Swift J151857.0-572147 again
- Swift Trigger 1218696: Another trigger on Swift J151857.0-572147
- GRB240218A: ATCA observation of the radio counterpart
- Transient EPW20240219aa: Optical observations with LDT
- Swift J151857.0-572147: Swift-BAT refined analysis
- GRB 240303B: Fermi GBM Detection
- GRB 240225B: Swift-XRT afterglow detection
- Swift detection of Swift J151857.0-572147
- Fermi trigger No 731161136: Global MASTER-Net observations report
- GRB 240303C: BALROG localization (Fermi Trigger 731189113 / GRB 240303837)
- GRB 240303B: BALROG localization (Fermi Trigger 731161136 / GRB 240303513)
- GRB 240303A: Swift detection of a burst
- GRB 240225B: Glowbug gamma-ray detection
- IceCube-240229A: Upper limits from a search for additional neutrino events in IceCube
- GRB 240225C: Glowbug gamma-ray detection
- GRB 240225A (short): Glowbug gamma-ray detection
- GRB 240229A: DDOTI Upper Limits on the Afterglow
- GRB 240218A: NOEMA upper limit
- GRB 240225B: further SAO RAS optical observations
- GRB 240229A: BALROG localization (Fermi Trigger 730908432 / GRB 240229588)
- GRB 240225B: VLT/X-shooter redshift
- GRB 240225B : MITSuME Akeno optical afterglow candidate detection
- GRB 240225B: 3.6m DOT observation
- GRB 240225B: WINTER near-IR observations and upper limits
- GRB 240225B: SAO RAS optical observations
- GRB 240225B: Mondy afterglow observations
- GRB 240218A: CMO SAI NIR upper limit
- GRB 240225B: Nanshan/HMT optical afterglow detection
- GRB 240225B: Swift-XRT observations
- Transient EPW20240219aa: Kp-band imaging observations with NIRES
- Transient EPW20240219aa: J-band upper limits from WINTER
- Transient EPW20240219aa: REM optical/NIR upper limits
- GRB 240225B: AstroSat CZTI detection
- GRB 240225B: MAXI/GSC detection
- Transient EPW20240219aa: Xinglong-2.16m optical upper limit
- GRB 240225A: Swift/BAT-GUANO detection of a short burst
- Transient EPW20240219aa: GECKO: LOAO Optical Upper Limits
- Transient EPW20240219aa: 7DT Optical Upper Limits
- VLA X-band observation of EPW20240219aa
- Transient EPW20240219aa: Mondy optical observations
- Transient EPW20240219aa: upper limit in gamma-ray range from SPI-ACS/INTEGRAL observations
- Insight-HXMT/HE Sub-Threshold Detection of Transient EPW20240219aa
- Transient EPW20240219aa: Liverpool Telescope non-detection and limiting magnitude
- GRB 240222A: GECAM detection of a burst
- GRB 240222A: Swift-BAT refined analysis
- GRB 240222A: Swift-XRT refined Analysis
- GRB 240222A: Fermi GBM Observation
- GRB 240222A: Swift/UVOT Upper Limits
- Fermi GBM Sub-Threshold Detection of EPW20240219aa as a likely GRB