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').
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"19366 results found.
- GRB 060719: XRT refined analysis
- GRB 060719: optical limit by Pi-of-the-Sky
- GRB060719: FRAM early follow-up limit
- GRB 060719: Swift detection of a burst
- GRB 060717: Swift XRT refined analysis
- GRB 060714: Refined analysis of the Swift-BAT burst
- GRB060717: Swift/UVOT upper limits
- GRB 060717: Swift XRT refined position
- GRB 060717: Swift-BAT refined analysis
- GRB 060717: Swift detection of a burst
- GRB 060714: Swift XRT refined analysis
- GRB060708: MARGE low resolution spectrum observations
- Swift-BAT trigger 219136 is not a GRB
- GRB060707 possible optical confirmation
- Swift trigger 219136 is probably not a GRB
- GRB 060714: Swift detection of a burst with an UVOT optical afterglow
- GRB 060712: XRT refined analysis
- GRB 060712: Swift/UVOT Upper Limits
- GRB 060712: XRT refined position
- GRB 060712: Refined analysis of the Swift-BAT burst
- GRB 060712: Swift detection of a burst
- GRB 060708: Swift-XRT refined analysis
- GCN 060708: Swift-UVOT Observations
- GRB 060708: Refined analysis of the Swift-BAT burst
- GCN 060707: Swift-UVOT observations
- GRB 060707: Swift-XRT refined analysis
- GRB 060708: Swift detection of a burst with an UVOT countpart
- GRB060707 possible optical confirmation
- GRB 060707: BOOTES-IR optical afterglow candidate
- GRB 060707: Refined analysis of the Swift-BAT burst
- GRB 060707: BOOTES-IR optical observation
- GRB060614: Possible SN Bump in UVOT U Band Light Curve
- GRB 060707: Swift detection of a burst
- GRB 060614: Detection of a Possible, Late-Time Rebrightening
- Swift-BAT trigger 215279 is not a GRB
- Trigger 215279: Swift detection of a possible burst (GRB 060619)
- GRB 060614: pseudo-z from spectral parameters of the prompt emission
- Konus-Wind observation of GRB 060614
- The Unusually Long-Lived Afterglow of GRB 060614
- GRB 060605, optical observations
- GRB060614: SSO 1m observations
- GRB060614: Watcher observation
- GRB 060614: Swift-BAT refined analysis
- GRB 060614: Swift/UVOT Observations
- GRB060614: Swift-XRT refined analysis
- GRB 060604, optical observations
- GRB 060614: Swift detection of a burst with a bright optical and X-ray counterpart
- GRB 060602A: Swift/XRT analysis
- BAT Trigger #214277 is SGR 1900+14
- GRB 060610: KAIT observations
- GRB 060607: RTT150 optical observations
- GRB 070706B: Watcher upper limit
- GRB 060607B: Swift-BAT Refined Analysis
- GRB060602A: Swift/UVOT upper limits
- GRB 060607B: Swift detection of a burst
- GCN 060607: Swift-UVOT obswervations.
- GRB 060607: Swift-BAT Refined Analysis
- GRB 060607: optical limit by "Pi of the Sky"
- GRB 060607: Swift-XRT Team refined analysis
- VLT/UVES observations of GRB 060607
- GRB 060605: RTT150 optical observations
- GRB 060607: Swift detection of a burst with bright optical counterpart
- GRB 060605 BAT refined analysis
- GRB060605: Swift/UVOT detections
- GRB 060605: Swift-XRT Team refined analysis
- GRB 060605: RTT150 optical observations
- GRB 060605: ROTSE-III Optical Counterpart
- GRB 060605: Swift detection of a burst with optical counterpart
- GRB 060605: ROTSE-III Detection of Optical Counterpart
- GRB060604: Swift/UVOT detections
- GRB 060604: redshift
- GRB 060604 optical photometry
- GRB 060604: Swift-XRT Team refined analysis
- GRB 060604: BAT refined analysis
- GRB 060604A: ROTSE-III Optical Limits
- GRB 060604: Swift detection of a burst with possible optical counterpart
- GRB 060602A: Swift-BAT Refined Analysis: Correction
- GRB 060602B: XMM-Newton Survey Source
- GRB 060602B: Swift-XRT Refined Analysis
- GRB 060602B: Swift-BAT Refined Analysis
- GRB 060602B: Swift/UVOT observations
- GRB 060602A: Swift-BAT Refined Analysis
- GRB 060602B: RTT150 optical observations
- GRB 060602B: Swift detection of a burst
- GRB060602 - SDSS Pre-Burst Observations
- GRB 060602: Swift detection of a burst
- GRB 060526: Break in X-ray light curve
- GRB 051227 : WIDGET simultaneous optical observations
- GRB 060526: Multiple Optical Flares
- GRB060502b: optical observations
- GRB 060526: Optical Flare
- GRB 060526: Refined analysis of the Swift-BAT burst
- GRB 060526: RTT150 optical observations
- GRB060526: Further Swift-UVOT Observations
- GRB 060526: Swift/XRT Team refined analysis
- GRB 060526: ROTSE-III Observations of Optical Counterpart
- GRB 060526: Watcher Observations
- GRB 060526: Continued emission for the Swift burst
- GRB 060526: Swift detection of a burst with x-ray and optical afterglow
- GRB 060413 : WIDGET simultaneous optical observations