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"23151 results found.
- GRB 081028, Swift-BAT refined analysis
- GRB 081028: TAROT Calern observatory optical observations
- GRB 081028: optical observations at the NOT
- GRB 081028: GROND Detection of the Optical/NIR Afterglow Candidate
- GRB 081028: Swift detection of a burst
- GRB081025: RTT150 optical observations
- GRB081024B: P200 Observations
- Konus-Wind observation of GRB 081025
- Swift UVOT observations of GRB 081024
- GRB 081024, Swift-BAT refined analysis
- GRB 081024: Faulkes Telescope North optical observations
- GRB 081024: KAIT Optical Limits
- GRB 081024: Early Super-LOTIS Observations
- GRB 081024: Swift detection of a burst
- GRB 081022, Swift-BAT refined analysis
- GRB 081022: Swift detection of a burst
- Swift detection of a possible burst (trigger 332287)
- GRB 081017, Swift-BAT refined analysis
- GRB 081017: Swift detection of a burst
- GRB 081016B, Swift-BAT refined analysis
- GRB 081016B: Swift detection of a burst
- Swift detection of flare on CC Eri
- GRB 081016: A long GRB discovered by INTEGRAL
- Trigger 331721 Due to Swift startracker loss-of-lock
- Swift-BAT triggered on the flare star Algol
- GRB 081012: Swift/UVOT analysis of initial observations
- GRB 081012: Swift/XRT detection
- GRB 081012, Swift-BAT refined analysis
- GRB 081012: Swift detection of a burst
- GRB 081011, Swift-BAT refined analysis
- GRB 081011: Swift detection of a burst
- Konus-Wind observation of GRB 081001
- GRB 081007: Rapid PROMPT Detections
- GRB 081008, Swift-BAT refined analysis
- GRB 081008: Swift detection of a burst with optical afterglow
- GRB081006B: Fermi GBM detection
- GRB081006: Fermi GBM detection
- GRB 081007, Swift-BAT refined analysis
- GRB 081007: Gemini-south redshift
- GRB 081007: Swift detection of a burst with optical afterglow
- GRB081003C: GLAST Burst Monitor detection
- Fermi GBM detection of additional bursts from AXP 1E1547.0-5408
- GRB 081003B: TAROT Calern observatory optical observations
- GRB 081003A: OSN optical observations
- GRB 081001: Further observations from OSN
- GRB 081003A: Swift-XRT Team position and analysis
- Swift-BAT refined analysis of AXP 1E1547.0-5408 (Trigger 330353)
- GRB 081003B: a long GRB detected with INTEGRAL
- GRB 080928: Fermi GBM detection
- GRB 081003: A long GRB discovered by INTEGRAL
- SGR 1550-5418 = AXP 1E1547.0-5408 (Trigger 330353)
- Swift discovery of a new Soft Gamma Repeater SGR 1550-5418
- Trigger 330353: Swift detection of a Galactic short soft burst
- GRB 081001: Observations from OSN
- GRB 080925: Suzaku WAM observation of the prompt emission
- GRB081001: SuperAGILE Localization of a long GRB
- GRB 080928: VLT redshift
- GRB 080928: Swift/UVOT observations
- GRB 080928, Swift-BAT final refined analysis
- GRB 080928, Swift-BAT initial refined analysis
- GRB 080928: Swift detection of a burst with an optical counterpart
- GRB 080925: Fermi GBM Detection
- GRB 080920: Fermi GBM detection
- GRB080922, optical upper limit
- Swift detection of a possible GRB (trigger 325707)
- GRB080916A: Suzaku WAM observation of the prompt emission
- GRB080922: A long GRB detected by INTEGRAL
- GRB 080913B: Fermi GBM detection
- Trigger 324561: IGR J08408-4503 detected by Swift
- GRB 080919: Swift-XRT refined analysis
- GRB 080919, Swift-BAT refined analysis
- GRB 080919: Swift detection of a short burst
- GRB 080916A: Rapid PROMPT Observations
- GRB 080916C: Swift UVOT Refined Analysis
- GRB 080916C: Swift XRT refined analysis
- GRB 080916B: Swift-XRT refined analysis
- Konus-Wind observation of GRB 080916A
- Konus-Wind observation of GRB 080916C
- GRB 080916C: GROND Detection of the Optical Afterglow Candidate
- GRB 080913: Konus-Wind and Swift/BAT joint spectral analysis
- IPN Triangulation and Energy Spectrum of GRB080916C
- GRB 080916B, Swift-BAT refined analysis
- GRB 080915a, SMARTS optical/IR observations
- GRB 080916A: Swift XRT refined analysis
- GRB 080916A, Swift-BAT refined analysis
- GRB 080916B: Swift-XRT afterglow detection
- GRB 080916B: Swift detection of a burst
- GRB 080916: Swift detection of a burst with optical afterglow
- GRB 080915B, Swift-BAT refined analysis
- GRB 080915B: Swift detection of a burst
- GRB 080915, Swift-BAT refined analysis
- SGR 0501+4516 : P200 i-band observations
- GRB 080915: Swift detection of a burst
- GRB 080913, Swift-BAT refined analysis
- GRB 080913: REM NIR early observations
- GRB 080913: GROND observation of a high-z optical/NIR afterglow candidate
- GRB 080913: Swift detection of a burst
- Swift-BAT/-XRT refined analysis on trigger 324362 (LS I +61 303)
- GRB 080906B: Fermi GBM detection
- Swift trigger 324362 (LS I +61 303 ?)