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"26206 results found.
- SGR Swift J1834.9-0846: Correction to the Swift-BAT refined spectral analysis
- Trigger 502024: Swift detection of KS 1741-293
- GRB110825A: Fermi GBM observation
- SGR Swift J1834.9-0846: Swift-BAT refined analysis of trigger 501752
- Swift detection of an SGR burst from Swift J1834.9-0846
- GRB 110825A: Suzaku WAM observation of the prompt emission
- GRB110825A: ROTSE early time optical limit
- GRB 110827A, Swift-BAT refined analysis
- GRB 110827A: Swift detection of a burst
- GRB110825A: Swift target of opportunity observation
- IPN triangulation of GRB110825A (very intense, long-duration)
- Swift-BAT Trigger 501485 is noise
- Swift-BAT refined analysis of SFXT IGR J08408-4503 (trigger 501368)
- Fermi GBM trigger 110823.518 is not a GRB
- GRB 110820A: Swift/UVOT Upper Limits
- GRB 110820A: CQUEAN izY Observation
- GRB 110820A: Swift-XRT refined Analysis
- GRB 110820A: Swift-BAT refined analysis
- GRB 110820A: Swift detection of a burst
- GRB 110818A: Fermi GBM observation
- GRB 110818A: Swift/UVOT Upper Limits
- GRB 110818A: Swift-XRT refined Analysis
- GRB 110815A: Swift-XRT and UVOT refined Analysis
- GRB 110818A, Swift-BAT refined analysis
- GRB 110815A : Suzaku WAM observation of the prompt emission
- GRB 110818A: Swift detection of a burst
- GRB 110801A: Konus-Wind and Swift/BAT joint spectral analysis
- Fermi Gamma-ray Burst Monitor trigger 110809.346 is not a GRB
- GRB 110808A: Swift/UVOT Detection
- Swift Trigger 458942 is probably not a burst
- GRB 110808A: Swift-BAT refined analysis
- GRB 110808A: Swift-XRT refined Analysis
- SGR J1834.9-0846: A Neutron Star in W41?
- Swift SGR 1834.9-0846: Swift-BAT refined analysis
- GRB 110808A: Swift detection of a burst with optical counterpart
- Fermi GBM detection of a SGR-like burst
- GRB 110807A: SAO RAS observations
- GRB 110807A: Swift detection of a burst or a posible new SGR
- Fermi Gamma-ray Burst Monitor trigger 110806.263 is not a GRB
- Fermi GBM trigger 334123030 (110804165) is not a GRB
- GRB 110731A : Suzaku WAM observation of the prompt emission
- GRB 110726A: Swift-XRT refined Analysis
- GRB110731A: MOA optical observations of the steeply fading afterglow
- GRB 110801A: SAO RAS optical observations
- GRB 110801A: Evidence for a jet break
- GRB 110801A: MASTER OT observations
- GRB 110801A: Swift-BAT refined analysis
- Swift/UVOT observations of GRB110801A
- GRB 110801A: Swift-XRT refined Analysis
- AXP 4U 0142+61: Fermi GBM detection
- GRB 110801A: TLS Optical afterglow confirmation
- GRB 110801A: ROTSE-III Detection of re-brightening from OT
- GRB 110801A: Swift detection of a burst with an optical counterpart
- GRB 110731A: Swift-XRT refined Analysis
- Konus-Wind observation of GRB 110731A
- GRB110731A: Swift/UVOT Observations
- GRB 110731A: Fermi GBM observation
- GRB 110731A: NOT photometry
- GRB 110731A: Swift-BAT refined analysis
- GRB 110731A: FTN+FTS afterglow observations
- GRB 110731A: Swift detection of a burst with an optical counterpart
- INTEGRAL Weak trigger #6331: GRT Optical Observation
- GRB 110721A: Swift observations of afterglow candidate
- AXP 4U 0142+61: Swift-BAT refined analysis
- Swift detection of a SGR-like burst from the AXP 4U 0142+61
- Swift triggers 458268 and 458269 are not astrophysical
- GRB 110726A: Further Swift/UVOT Observations
- GRB 110726A: Swift-BAT refined analysis
- GRB 110726A: Swift/UVOT Detection
- GRB 110726A: Liverpool Telescope observations
- GRB 110726: ROTSE-III Detection of Optical Counterpart
- GRB 110726A: Swift detection of a burst
- GRB 110721A: Preliminary Swift/UVOT Upper Limits
- GRB 110721A: potential counterpart candidate
- GRB 110721A: Fermi-LAT detection
- GRB 110721A: Fermi GBM detection
- GRB110715A: spectral lag analysis
- GRB 110715A : Suzaku WAM observation of the prompt emission
- GRB 110719A: GRT Optical Observation
- Swift/UVOT observations of GRB110719A
- Swift J1822.3-1606 : Fermi GBM observation
- GRB 110719A: Swift-XRT refined Analysis
- GRB 110719A: Swift-BAT refined analysis
- GRB 110719A: Swift detection of a burst
- GRB 110709B : Suzaku WAM observation of the prompt emission
- GRB 110715A: ATCA detection of the radio counterpart
- GRB110715A: GROND Detection of the Optical/NIR Afterglow
- Konus-Wind observation of GRB 110715A
- GRB 110715A: Swift-XRT refined Analysis
- Swift J1822.3-1606: Swift-XRT detection of the X-ray counterpart
- GRB 110715A: Swift/UVOT Detection
- GRB 110715A: Swift-BAT refined analysis
- Swift J1822.3-1606: A Probable New SGR in Ground Analysis of BAT Data
- GRB 110715A: Swift detection of a bright burst with an optical counterpart
- GRB 110709B: Swift/UVOT Observations
- GRB 110709B: Additional Gemini observations and deep limits on an optical afterglow
- Swift trigger 457076 is not a GRB
- GRB 110709A: Suzaku WAM observation of the prompt emission
- Swift Trigger 457076: a possible GRB
- GRB 110709A: Swift/UVOT Upper Limits