GCN Circulars
GCN Circulars are rapid bulletins submitted by and distributed to the community. 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').
Advanced Search
To narrow the search results, use advanced search syntax. This allows for specifying which circular field to search (submitter, subject, and/or body). For additional information, refer to the advanced search documentation.
Advanced Search Examples (click to copy):
subject:"Swift"body:"GRB"submitter:"Judith Racusin"19608 results found.
- Swift GRB221110.10: Global MASTER-Net OT detection
- Swift GRB221110.10: Global MASTER-Net observations report
- GRB 221107A: Fermi GBM Observation
- GRB 221107A: Detection by GRBAlpha
- GRB 221107A: Swift/BAT-GUANO detection outside the coded FOV
- Correction to GCN 32852 (GRB 221009A: SARA-RM 1m Optical Afterglow Detection)
- GRB 221029A: CALET Gamma-Ray Burst Monitor detection
- High-precision position of the compact radio counterpart to GRB221009A
- GRB 221028A: GRANDMA observations
- GRB 221027B: GRANDMA observations
- GRB 221028A: Detection by VZLUSAT-2
- GRB 221028A: Swift-XRT refined Analysis
- GRB 221028A: 1.3m DFOT Optical upper limit
- GRB 221028A, Swift-BAT refined analysis
- GRB 221027B: Swift-BAT refined analysis
- GRB 221029A: Swift/BAT-GUANO detection outside the coded FOV
- Trigger 1132968: Swift trigger is the Crab
- GRB 221028A: HCT optical upper limit
- GRB 221028A: AGILE detection
- GRB 221028A: MITSuME Okayama optical upper limits
- Swift GRB 221028A: Global MASTER-Net observations report
- GRB 221028A: BOOTES-4/MET optical upper limit
- GRB 221028A: GIT optical upper limit
- GRB 221027B: Swift/UVOT Upper Limits
- GRB 221028A: Swift detection of a burst
- GRB 221027B: FRAM-ORM and Ondrejov SBT optical limits
- Swift GRB 221027B: Global MASTER-Net observations report
- GRB 221027B: Swift-XRT refined Analysis
- GRB 221027B: BOOTES-1 optical upper limit
- GRB 221027B: Enhanced Swift-XRT position
- GRB 221027B: Swift detection of a burst
- Konus-Wind detection of GRB 221022B
- GRB 221024A: Mondy optical observations
- GRB 221027A: Fermi-LAT detection
- GRB 221024A: GRANDMA observations
- IPN triangulation of GRB 221022C (short)
- GRB 221024A: Swift-BAT refined analysis
- GRB 221009A: SARA-RM 1m Optical Afterglow Detection
- GRB 221024A: Swift/UVOT UV upper limits
- GRB 221022A: Swift-XRT observations
- GRB 221024A: Swift-XRT refined Analysis
- GRB 221022B: Detection by GRBAlpha
- GRB 221025A: Fermi-LAT detection
- IPN triangulation of GRB 221022B (long)
- GRB 221024A: GIT confirmation of the optical afterglow
- GRB 221024A: Enhanced Swift-XRT position
- GRB 221024A: D50 candidate afterglow
- GRB 221022B: AstroSat CZTI detection
- GRB 221022A: Fermi GBM detection
- GRB 221022A: Swift ToO observations
- GRB 221023A: Fermi-LAT detection
- GRB 221022B: Fermi GBM detection
- GRB 221021A: Fermi GBM observation
- GRB 221009A: Determination of the black holes mass and spin
- GRB 221024A: Swift detection of a burst
- GRB 221022A: Swift/BAT-GUANO detection
- GRB 221022B: Swift/BAT-GUANO detection outside the coded FOV
- GRB 221009A: optical observations, SN photometric evidence
- GRB 221021A: Swift/BAT-GUANO detection outside the coded FOV
- GRB 221017A: Swift-XRT observations
- Improved IPN localization for GRB 221009A (BepiColombo-MGNS light curve)
- GRB 221009A: BOAO NIR detections
- GRB 221009A X-ray light-curve and the indication of TeV light-curve
- GRB 221009A: Spectroscopic detection of emerging SN features
- GRB 221013B: Swift/BAT-GUANO detection
- AGILE detection of the 2022 October 17 burst from SGR J1935+2154 reported by Konus-Wind
- GRB 221009A: GRANDMA observations
- The probability of observing GRB 221009A at z = 0.151
- GRB 221017A: Swift ToO observations
- AGILE detection of short X-ray flaring activity contemporary to SGR J1935+2154 reported bursts
- GRB 221009A: Second epoch of NuSTAR data
- GRB 221016A: Swift-BAT refined analysis
- GRB 221016A: Swift/UVOT Detection
- GRB 221016A: Swift-XRT refined Analysis
- Konus-Wind detection of GRB 221016A
- GRB 221016A: Fermi GBM observation
- GRB 221009A: A type I BdHN of exceptional energetics
- GRB 221016A: Enhanced Swift-XRT position
- GRB 221016A: Swift detection of a burst
- Swift GRB221016.99: Global MASTER-Net observations report
- GRB 221009A: Faulkes Telescope North continued optical afterglow follow-up
- GRB 221009A: continued Assy optical afterglow observations, possible SN evidence
- GRB 221009A: LEIA X-ray Afterglow Detection
- GRB 221009A: ATCA radio spectrum
- GRB 221009A: Armchair Energetics
- GRB 221009A: Fermi LAT data rate effects due to extremely high flux
- GRB 221009A: Large Binocular Telescope Observatory optical afterglow detection
- GRB 221009A: Pan-STARRS optical photometry
- MAXI/GSC refined analysis of the bright X-ray afterglow of GRB 221009A/Swift J1913.1+1946
- GRB 221009A: continued REM optical/NIR observations and evidence for an achromatic steepening in the afterglow light curve
- GRB 221009A: HEBS detection
- GRB 221009A: Gamma-ray Detection by SIRI-2
- GRB221009A: Detection as sudden ionospheric disturbances (SID)
- GRB 221009A: search for neutrinos with KM3NeT
- GRB221009A: LCOGT Continued Observations - Optical Upper Limits
- GRB 221009A/Swift J1913.1+1946: low-frequency ASKAP observations
- GRB 221006A: Swift-XRT afterglow detection
- GRB 221009A: MITSuME Okayama optical observation
- GRB 221009A: Sayan observatory 1.6-m telescope observations
- GRB 221009A/Swift J1913.1+1946: SMA observations