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').
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"
18640 results found.
- GRB 060117: FRAM optical afterglow candidate
- GRB 060117: Swift-BAT detection of a bright burst
- GRB 060116: Refined analysis of the Swift-BAT burst
- GRB 060116: Swift/UVOT upper limits
- GRB060115: REM observations
- GRB 060110: XRT position and analysis
- GRB 060116: ROTSE-III Optical Limits
- GRB060116: XRT position
- GRB060116: Faulkes North observation
- GRB 060116: Swift-BAT detection of a burst
- GRB 060115: Refined analysis of the Swift-BAT burst
- GRB 060115: Swift/UVOT upper limits
- GRB 060115: Swift XRT refined analysis
- GRB 060114: Swift/UVOT Observations
- GRB 060115: MITSuME optical afterglow candidate
- GRB 060115: Swift detection of a burst
- GRB 060114: Swift XRT upper limit
- GRB 060110: KAIT observations
- GRB 060111B: Swift XRT refined analysis
- GRB 060111A: refined UVOT anaysis
- GRB 060111B: TAROT optical observation
- GRB060111A: RTT150 optical observations
- GRB060111B: RTT150, possible host galaxy
- GRB 060111B: Refined analysis of the Swift-BAT burst
- GRB 060110: MARGE observations
- GRB 060111B: ROTSE-III Detection of Optical Counterpart Flare
- GRB 060111B: Swift detection of a burst
- GRB 060111: Swift-BAT Refined Analysis
- GRB 060111: TAROT optical observation
- GRB 060111: possible UVOT counterpart
- GRB060111 : XRT refined analysis
- GRB 060111: ROTSE-III Optical Limits
- GRB 060111: Swift detection of a burst
- GRB 060110: Swift-BAT refined analysis
- GRB 060109: Swift-BAT refined analysis
- GRB 060110a: RAPTOR detection of early optical emission.
- Correction to GRB 060109 XRT analysis
- GRB 060110: Swift-BAT detection of a burst
- GRB 060109: Refined Swift-XRT analysis
- GRB 060109: Swift/UVOT upper limits
- Swift UVOT correction to GCN 4455
- GRB 060109: Swift Detection of a long burst
- GRB 060108: Refined XRT analysis
- GRB 060108: VLT J-band observations
- GRB 060108: Swift/UVOT upper limits
- GRB 060105: quick look analysis of the Suzaku/XIS afterglow observation
- GRB060108: Faulkes Telescope observation
- GRB 060108: Refined analysis of the Swift-BAT burst
- GRB 060108: Swift XRT position
- GRB060108: Swift detection of its 100th GRB
- GRB 060105: Radio observations
- Konus-Wind observation of GRB 060105
- GRB 060105: Swift/UVOT upper limits
- GRB 060105: BAT refined analysis
- GRB 060105: XRT refined analysis
- GRB060105: Swift detection of a bright long burst
- Swift-BAT trigger 175653 is not an astrophysical source
- Swift-BAT trigger 175653 is probably not a GRB
- GRB 060102: Swift-BAT refined analysis
- Time Correction to GRB 060102
- GRB 060102: Swift-BAT detection of a burst
- GRB051211B: optical observations
- GRB051227: SARA Observations
- GRB 051221B: Optical Observations with Kuiper 1.54m
- GRB051221B: Radio observations
- GRB051227: Radio Observations
- GRB 051227: Swift/UVOT Upper Limits (Possible U-band
- GRB 051227: MDM Observation
- GRB 051227: Joint Swift-HETE Spectral Analysis
- GRB 051227: XRT refined analysis
- GRB 051227: Further analysis of the Swift-BAT burst
- GRB 051227: Refined analysis of the Swift-BAT burst
- GRB051227: SDSS pre-burst observations
- GRB 051227: Swift detection of a burst
- Konus-Wind observation of GRB 051221A
- GRB051221A: Suzaku WAM observation of the prompt emission
- GRB051016: analysis of the XMM-Newton observation
- GRB 051221A: Detection at 251nm with Swift UVOT
- GRB 051221A: Chandra Afterglow Position
- GRB 051221A: Refined spectral and temporal analysis of the Swift-BAT short hard burst
- GRB 051221B: ROTSE-III Optical Limits
- GRB 051221B: TAROT optical limits
- GRB 051221A: WSRT Radio Observations
- GRB 051221B: Refined analysis of the Swift-BAT burst
- Possible GRB 051221B: MDM Optical Detection
- GRB 051221A: RAPTOR Fading Counterpart Constraint
- GRB 051221B: BOOTES optical observations.
- Possible GRB 051221B: Swift XRT position
- Swift-BAT detection of a possible burst
- GRB 051221: Swift XRT refined analysis
- GRB 051221: Swift/UVOT upper limits
- GRB 051221: XRT position
- GRB 051221: Refined analysis of the Swift-BAT short hard burst
- GRB 051221: Swift detection of a bright short burst
- Refined analysis of the SWIFT J1626.6-5156
- Swift-BAT discovery of hard x-ray transient SWIFT J1626.6-5156
- Refined analysis of the Swift-BAT detection of the RS CVn star II Peg
- GRB 051211B: optical afterglow
- Swift detection of an RS CVn flare star
- Swift Trigger 172767 is not a GRB