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"19533 results found.
- No IPN GRB detected in conjunction with candidate GRB 110215
- GRB GRB 110223A: MASTER VWF early optical observations
- Swift/UVOT observations of GRB110223b
- GRB 110223A: Swift-BAT refined analysis
- GRB 110223A: Swift-XRT refined Analysis
- GRB 110223B: Swift-XRT refined Analysis
- GRB 110223A: Enhanced Swift-XRT position
- GRB 110223B: Enhanced Swift-XRT position
- GRB 110223B: Swift-BAT refined analysis
- GRB 110223B: GROND Detection of Optical Afterglow Candidate
- GRB 110223B: Swift detection of a burst
- GRB 110223A: Swift detection of a burst
- GRB 110213B: Swift/UVOT observations
- GRB110213B: X-ray afterglow confirmation
- Fermi GBM detection of an SGR-like burst
- Swift XRT and UVOT Observations of OT 110215
- GRB 110213A: optical observations in CrAO
- GRB 110213A: optical observations in Mondy
- Swift/UVOT observations of GRB110210a.
- GRB 110210A: optical upper limit
- GRB 110210A: ROVOR Upper Limit
- GRB110213A: RAPTOR Early Optical Peak and Plateau Measurements
- GRB 110212A: Swift XRT and UVOT observations
- Swift GRB110213A: interesting behaviour
- GRB 110213A: Fermi GBM observation
- GRB 110205A: Konkoly optical observations
- GRB 110213B: Swift XRT observation
- Konus-Wind observation of GRB 110213A
- GRB 110213A: Swift-XRT refined Analysis
- GRB 110213A: Swift/UVOT refined analysis
- GRB 110213A: Lightbuckets Optical Observations
- GRB 110213A, Swift-BAT refined analysis
- GRB 110213A: optical observations
- GRB 110213A: Enhanced Swift-XRT position
- GRB 110213A: Bok Telescope Redshift
- GRB 110213A: ROTSE-III Detection of Optical Counterpart
- GRB 110213A: Swift detection of a burst with optical afterglow
- GRB 110212A: GRT Optical Observation
- GRB 110212A, Swift-BAT refined analysis
- GRB 110212A: ROTSE-III Optical Limits
- GRB 110212A: Swift detection of a burst
- GRB 110207A: Suzaku WAM observation of the prompt emission
- GRB 110210A: Swift-XRT refined Analysis
- GRB 110205A: Swift/BAT and Suzaku/WAM joint spectral analysis
- GRB 110210A: Swift-BAT refined analysis
- Swift-BAT refined analysis of outburst from 1E 1841-04.5
- GRB 110210A: Enhanced Swift-XRT position
- GRB 110201A: optical observations
- GRB 110210A: Swift detection of a burst
- GRB 110206A: Swift-XRT confirmation of the X-ray afterglow
- Fermi GBM detection of a burst from 1E 1841-045
- Swift/UVOT observations of GRB110208a
- GRB 110205A: Suzaku WAM observation of the prompt emission
- GRB 110207A: Swift-XRT observations
- GRB 110208A: Swift-XRT refined Analysis
- GRB 110208A: Enhanced Swift-XRT position
- GRB 110208A: Swift-BAT refined analysis
- GRB 110208A: Swift detection of a burst
- SGR-like outburst from the magnetar 1E 1841-04.5
- GRB 110205A: optical observations in Mondy observatory
- GRB 110207A: Fermi GBM observation
- GRB 110205A : HCT optical observations
- GRB 110207A: TAROT Calern observatory optical observations
- GRB 110207A: Swift-BAT refined analysis
- GRB 110206A: UVOT detection of afterglow candidate
- GRB 110207A: MASTER prompt and early optical observations
- Konus-Wind observation of GRB 110205A
- GRB 110207A: Swift detection of a burst
- GRB 110206A: Swift detection of a probable X-ray afterglow
- GRB 110205A: Lightbuckets Optical Observations
- GRB 110205A: Swift/UVOT Continuing Observations
- Observations GRB 110205A
- GRB 110205A: Swift-BAT refined analysis
- GRB 110205A: Newcastle Observatory Optical Observations
- GRB 110205A: Swift-XRT refined Analysis
- GRB 110205A: optical flare confirmation
- GRB 110205A: Enhanced Swift-XRT position
- GRB 110205A: PAIRITEL NIR Afterglow Detection
- GRB 110205A: Swift/UVOT Confirmation of Flaring Afterglow
- GRB 110205A: Liverpool Telescope Afterglow Confirmation
- GRB 110205A: ROTSE-III, Optical Counterpart is flaring to ~14 mag
- GRB 110205A: TAROT Calern observatory optical detection
- GRB 110205A: Swift detection of a burst with an optical candidate
- GRB 110128A: Fermi GBM detection
- GRB 110201A: Swift-XRT refined Analysis
- Swift/UVOT observations of GRB110201A
- GRB 110201A: Swift-BAT refined analysis
- GRB 110201A: MASTER optical observations
- GRB 110201A: Swift detection of a burst
- GRB 110128A, Swift-BAT refined analysis
- GRB 110128A: Swift/UVOT observations
- GRB 110128A: Swift-XRT refined Analysis
- GRB 110128A: Enhanced Swift-XRT position
- GRB 110128A: TAROT Calern observatory upper limits
- GRB 110128A: Swift detection of a burst
- GRB 110106B, radio observations
- IPN triangulation of GRB 110120A
- GRB 110106A: CrAO optical observations
- GRB 110119A: Fermi GBM detection
- GRB 110119A: Suzaku WAM observation of the prompt emission