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.
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"21525 results found.
- IPN triangulation of a bright burst from SGR 1935+2154
- GRB 210826A: further Swift-XRT observations
- Swift detection of a burst from SGR Swift J1555.2-5402
- GRB 210619B: Maidanak and Assy optical observations, broken power law parametrization
- GRB 210905A: Swift/UVOT Upper Limits
- GRB 210905A: AstroSat CZTI detection
- GRB 210905A, GROND observations
- Konus-Wind detection of GRB 210905A
- Fermi GBM Sub-Threshold Detection of GRB 210905A
- GRB 210905A: Swift-XRT refined Analysis
- GRB 210905A: DECam Detection
- GRB 210905A: Continued LCO Optical Observations
- GRB 210905A: LCO Optical Detection
- GRB 210905A: Enhanced Swift-XRT position
- GRB 210901A: Swift/UVOT Upper Limits
- Swift GRB 210905A: Global MASTER-Net observations report
- GRB 210905A: Swift detection of a burst
- Swift GRB210903.59: Global MASTER-Net observations report
- Swift GRB210903.58: Global MASTER-Net observations report
- Swift GRB210903.58: Global MASTER-Net observations report
- GRB 210901A: GROND observations
- Fermi GBM observation of a burst from SGR J1555.2-5402
- GRB 210901A: Swift-XRT refined Analysis
- GRB 210901A: Swift-BAT refined analysis
- GRB 210901A: Enhanced Swift-XRT position
- GRB 210901A: LCO Optical Upper Limit
- Swift GRB 210901A: Global MASTER-Net observations report
- GRB 210901A: Swift detection of a burst
- GRB 210827A: further Swift-XRT observations
- GRB 210822A: CALET Gamma-Ray Burst Monitor detection
- GRB 210827A: Swift/UVOT Upper Limits
- GRB 210827A: BOOTES-5/JGT optical upper limit
- GRB 210827A: Fermi GBM Observation
- GRB 210827A: Swift-XRT observations
- GRB 210827A: Swift ToO observations
- GRB 210827A: Swift/BAT-GUANO detection and arcminute localization
- GRB 210820A: CAHA 2.2m Optical Detection
- GRB 210824A: Swift/UVOT Upper Limits
- GRB 210826A: Swift/UVOT Upper Limits
- GRB 210826A: Swift-XRT observations
- GRB 210822A: CAHA 2.2m observations
- GRB 210824A: Swift-BAT refined analysis
- GRB 210826A: Fermi-LAT detection
- GRB 210826A: Tiled Swift observations
- GRB 210824A: MITSuME Akeno optical upper limits
- Swift GRB210825.29: Global MASTER-Net observations report
- GRB 210822A: VLA detection
- Swift detection of an outburst from SGR Swift J1555.2-5402
- GRB 210822A: Swift/UVOT Detection
- Swift GRB 210824A: Global MASTER-Net observations report
- GRB 210824A: BOOTES-5/JGT optical upper limit
- GRB 210824A: Fermi GBM Observation
- GRB 210824A: Nanshan/NEXT optical upper limit
- GRB 210824A: Swift-XRT refined Analysis
- GRB 210822A: GROND observations
- GRB 210824A: Enhanced Swift-XRT position
- GRB 210824A: Swift detection of a burst
- GRB 210822A: Detection by GRBAlpha
- GRB 210822A: GECAM refined analysis
- GRB 210820A: GROND observations
- Konus-Wind detection of GRB 210822A
- GRB 210822A: AstroSat CZTI detection
- GRB 210822A: Swift-XRT refined Analysis
- GRB 210822A: Swift-BAT refined analysis
- GRB 210820A: NUTTelA-TAO / BSTI Early Optical Limits (Preliminary)
- GRB 210822A: Fermi-LAT detection
- GRB 210820A: Swift/UVOT Detection
- GRB 210822A: Enhanced Swift-XRT position
- Swift GRB 210822A: Global MASTER-Net observations report
- GRB 210822A: KAIT Optical Afterglow Confirmation
- GRB 210822A: GECAM detection
- GRB 210822A: Swift detection of a burst with an optical afterglow
- GRB 210820A: Swift-BAT refined analysis
- GRB 210820A: LT optical upper limit
- GRB 210820A: LCO Optical Upper Limit
- GRB 210820A: RATIR Optical Detections
- GRB 210820A: NOT optical upper limit
- GRB 210820A: Nanshan/NEXT optical upper limit
- GRB 210820A: Swift-XRT refined Analysis
- GRB 210820A: Enhanced Swift-XRT position
- Swift GRB 210820A: Global MASTER-Net observations report
- GRB 210820A: Swift detection of a burst with an optical counterpart
- Swift GRB210818.68: Global MASTER-Net observations report
- Swift GRB 210818A: Global MASTER-Net observations report
- GRB 210818A: Swift-XRT refined Analysis
- GRB 210818A: Swift-BAT refined analysis
- Konus-Wind detection of GRB 210818A
- Swift Trigger 1069242 is Cyg X-1
- GRB 210818A: AstroSat CZTI detection
- GRB 210818A: AGILE detection
- GRB 210818A: Enhanced Swift-XRT position
- GRB 210818A: Swift detection of a burst with an optical counterpart
- GRB 210712A: Fermi GBM observation
- SGR 1935+2154: SPI INTEGRAL observations on 2021 August 5
- GRB 210730A: Tautenburg observations
- GRB 210807C: Swift-BAT refined analysis
- GRB 210807A: Detection by GRBAlpha
- GRB 210807A: Swift-BAT refined analysis
- GRB 210802A: Further Swift/XRT observation and afterglow confirmation
- GRB 210807C: Swift-XRT refined Analysis