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"26241 results found.
- SGR1806-20, Swift-BAT refined analysis (Trigger 519868)
- Swift Trigger 519874 is probably a noise event
- Trigger 519868: Swift detection of SGR1806-20
- GRB 120404A: optical observations
- GRB 120404A, Optical Observations
- GRB 120404A: JCMT SCUBA-2 sub-mm observation
- GRB 120404A: MASTER OT observations
- GRB120404A: GROND observations show steeply decaying afterglow
- GRB120404A: MOA optical observations of the initial rise afterglow
- GRB 120404A: VLT/X-shooter redshift confirmation
- GRB 120404A: Swift/UVOT Detection
- GRB 120403B: Swift-XRT refined Analysis
- GRB 120404A: Swift-XRT refined Analysis
- GRB 120404A: Swift-BAT refined analysis
- GRB 120401A: GROND Detection of an optical/NIR afterglow candidate
- GRB 120403B: TAROT La Silla observatory optical observations
- GRB 120403B: Fermi GBM Observation
- GRB 120404A: Gemini-N Redshift
- GRB 120403B: AAT nIR observations
- GRB 120404A: MITSuME Akeno Optical upper limits
- GRB 120404A: Faulkes Telescope North afterglow confirmation
- GRB 120404A: Swift detection of a burst with an optical counterpart
- GRB 120403B: Swift-BAT refined analysis
- GRB 120403B: Swift/UVOT Upper Limits
- GRB 120403B: Swift detection of a burst
- BAT trigger 519207 was a burst from Cyg X-1, was not GRB 120402A
- GRB 120402A: optical upper limit
- GRB 120320A: early optical upper limit
- GRB 120403A, Swift-BAT refined analysis
- GRB 120402B: Fermi GBM detection
- GRB 120326A: Bassano Bresciano Observatory - correction for GCN Cir 13178
- GRB 120403A: Swift detection of a burst
- GRB 120402A: Swift detection of a possible burst or noise
- GRB 120326A: Cima Rest and Bassano Brescia
- GRB 120401A: Swift-XRT refined Analysis
- GRB 120401A: Swift-BAT refined analysis
- GRB 120401A: Swift detection of a burst
- GRB 120326A: Bassano Bresciano Observatory lightcurve analisis
- GRB 120326A : Suzaku WAM observation of the prompt emission
- GRB 120326A: CARMA 3mm detection
- Swift trigger 518853 is most likely GX 301-2
- GRB 120326A: Bassano Bresciano Observatory optical observations
- Swift trigger 518853: MASTER-ICATE possible OT
- The Swift-XRT source associated with trigger 518853 is a cosmic ray
- Trigger 518853: Swift detection of a probable Galactic transient
- GRB 120328B: Fermi-LAT Observations
- GRB 120327A: Zadko optical observations
- GRB 120328B: Fermi GBM detection
- GRB 120328A: Swift/UVOT Upper Limits
- GRB 120328A: Swift-XRT refined Analysis
- IPN Triangulation of GRB 120328B (long/intense)
- GRB 120328A: Swift-BAT refined analysis
- GRB 120328A: TAROT La Silla observatory optical observations
- Skynet/PROMPT observations of GRB120328A
- GRB 120328A: Swift detection of a burst
- GRB 120326A: Fermi GBM Observation
- GRB 120327A afterglow detection
- GRB 120326A: PAIRITEL NIR Observations
- GRB 120326A: Bassano Bresciano Observatory optical observations
- GRB 120327A: Swift-XRT refined Analysis
- GRB 120327A: Swift/UVOT further analysis
- GRB 120327A: Swift-BAT refined analysis
- GRB 120327A: X-shooter redshift
- GRB 120327A: Gemini-South redshift
- GRB 120327A: TAROT La Silla observatory optical decay
- GROND observations of GRB 120327A
- GRB 120327A: Liverpool Telescope Observations
- GRB 120327A: TAROT La Silla observatory optical detection
- GRB 120327A: Swift detection of a burst with an optical counterpart
- GRB 120326A: Swift-BAT refined analysis
- GRB 120326A: T17 optical observations
- GRB 120326A: Swift-XRT refined Analysis
- GRB 120326A: Swift/UVOT Detection
- GRB 120326A: Liverpool Telescope observations
- Skynet/Dolomiti Observations of GRB120326A
- GRB 120326A: TAROT Calern observatory afterglow optical detection
- GRB 120326A: ROTSE-III Optical Limits
- GRB 120326A: Swift detection of a burst
- GRB 120323A: Fermi LAT observations
- IPN Triangulation of GRB 120323A (short/very intense)
- GRB 120324A: Swift-XRT refined Analysis
- Konus-Wind observation of GRB 120324A
- GRB 120323A: Fermi GBM detection
- GRB 120324A: GROND observations
- GRB 120324A: Swift-BAT refined analysis
- GRB 120324A: Swift/UVOT Upper Limits
- GRB 120324A: TAROT La Silla observatory optical observations
- GRB 120324A: Liverpool Telescope optical candidate
- GRB 120324A: UVOT Finding Chart Observation
- GRB 120324A: Swift detection of a burst
- GRB 120316A : Suzaku WAM observation of the prompt emission
- GRB 120320A: Zadko optical observations
- GRB 120316A: Fermi-GBM and Fermi-LAT Observations
- GRB 120320A: Swift/UVOT Upper Limits
- GRB 120320A , optical observations
- GRB 120320A: Swift-XRT refined Analysis
- GRB 120320A, Swift-BAT refined analysis
- Fermi GBM trigger 120319.237 is not a GRB
- Konus-Wind observation of GRB 120316A
- IPN Triangulation of GRB 120316A