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').
552 results found.
- GRB 140903A: Swift-BAT refined analysis
- GRB 140829A: iPTF optical observations
- Swift trigger 609139 is probably 4U 1850-03
- GRB 140709A, Swift-BAT refined analysis
- GRB 140705A: Swift-BAT refined analysis of a possible newly discovered SGR 1935+2154
- GRB 140622A: TAROT La Silla observatory optical observations
- GRB 140622A: An unusual short event, Swift-BAT refined analysis
- GRB 140610A: Swift-XRT refined Analysis
- GRB 140518A, Swift-BAT refined analysis
- GRB 140306A: Fermi GBM detection
- GRB 140304A: Swift-BAT refined analysis
- GRB 140219A: Fermi GBM Detection
- GRB 140209A, Swift-BAT refined analysis
- GRB 140206A: Swift-XRT refined Analysis
- GRB 140102A: Swift detection of a burst with optical counterpart
- GRB 131202A, Swift-BAT refined analysis
- GRB 131024B, Swift-BAT refined analysis
- GRB 130912A, Swift-BAT refined analysis
- GRB 130831A, Swift-BAT refined analysis
- GRB 130806A, Swift-BAT refined analysis
- Swift Trigger 558828 is not an interesting event
- Swift Trigger 557674 was due to an onboard position error
- GRB 130605A: Swift-BAT refined analysis
- GRB 130603B: Swift-BAT refined analysis
- GRB 130528A: Swift-BAT refined analysis
- GRB 130518A: mm detection at PdBI
- Konus-Wind observation of GRB 130504C
- GRB 130504A, Swift-BAT refined analysis
- GRB 130425A: Suzaku WAM observation of the prompt emission
- GRB 130420B, Swift-BAT refined analysis
- GRB 130418A: Swift detection of a burst with an optical counterpart
- GRB 130327A: Swift-BAT refined analysis
- GRB 130206A, Swift-BAT refined analysis
- GRB 130122A: Swift-BAT refined analysis
- GRB 121226A, Swift-BAT refined analysis
- GRB 121202A: Swift-BAT refined analysis
- GRB 121117A, Swift-BAT refined analysis
- GRB 121031A, Early peak observed with Swift-BAT
- GRB 121102A: Swift-BAT refined analysis
- GRB 121031A: Swift-BAT refined analysis
- GRB 121028A: Swift-BAT refined analysis
- GRB 121027A: Swift-BAT refined analysis
- GRB 121017A: Swift-BAT refined analysis
- GRB 120923A: Swift-BAT refined analysis
- Konus-Wind observation of GRB 120909A
- GRB 120907A: Swift-BAT refined analysis
- Swift Trigger 530581: GRB 120811A or a galactic transient
- GRB 120803A: Swift-BAT refined analysis
- GRB 120729A, Swift-BAT refined analysis
- GRB 120703A: Swift-BAT refined analysis
- GRB 120701A: Swift-XRT afterglow detection and analysis
- GRB 120701A: Swift-BAT refined analysis
- Skynet/PROMPT observations of IGR J17062-6143 (Swift trigger 525148)
- Swift detection of IGR J17062-6143
- GRB 120514A: Swift-BAT refined analysis
- Swift detection of 4U 1630-47
- GRB 120422A: Swift-BAT refined analysis
- GRB120404A: MOA optical observations of the initial rise afterglow
- GRB 120324A: Swift detection of a burst
- LS I +61 303: Swift-BAT refined analysis
- Swift detection of a burst from LS I +61 303
- Konus-Wind observation of GRB 120129A
- GRB 120118B, Swift-BAT refined analysis
- Konus-Wind observation of GRB 120119A
- GRB 120119A: Swift detection of a burst with an optical counterpart
- XRF 120118A: Optical candidate
- AXP 4U 1042+61: Mondy optical observations
- GRB 120116A: Swift-BAT refined analysis
- AXP 4U 0142+61: Swift-BAT refined analysis (trigger 511611)
- Swift detection of an SGR burst from AXP 4U 0142+61
- GRB 111222A : Suzaku WAM observation of the prompt emission
- GRB 111215B: Suzaku WAM observation of the prompt emission
- GRB 111210A: Swift-BAT refined analysis
- GRB 111129A: Swift-BAT refined analysis
- SGR Swift J1834.9-0846: Swift-BAT refined analysis of trigger 501752
- GRB 110827A, Swift-BAT refined analysis
- Swift-BAT refined analysis of SFXT IGR J08408-4503 (trigger 501368)
- GRB 110818A: Swift-XRT refined Analysis
- GRB110731A: MOA optical observations of the steeply fading afterglow
- AXP 4U 0142+61: Fermi GBM detection
- AXP 4U 0142+61: Swift-BAT refined analysis
- Swift detection of a SGR-like burst from the AXP 4U 0142+61
- GRB 110709B: Preliminary Swift-BAT refined analysis
- GRB 110530A: optical observations in Mondy observatory
- GRB 110530A: optical observations at Mt. Terskol, second epoch
- GRB 110530A: Swift/UVOT Detection of a Fading Afterglow
- GRB 110530A: optical observations at Mt. Terskol
- GRB 110530A: Swift-BAT refined analysis
- GRB 110530A: Swift detection of a burst with an optical afterglow
- GRB 110521A: Swift-XRT refined analysis
- GRB 110422A: Swift-BAT refined analysis
- GRB 110420B: Swift-BAT refined analysis
- GRB 110420A: Swift-BAT refined analysis
- GRB 110411A, Swift-BAT refined analysis
- GRB 110402A: fading optical afterglow
- GRB 110402A: optical observations in Mondy
- GRB 110402A: Liverpool Telescope Observations
- GRB 110305A: Swift-BAT refined analysis
- Konus-Wind observation of GRB 110213A
- GRB 110106B: Swift-BAT refined analysis