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"615 results found.
- AGILE detection of GRB 090510
- GRB 090429A: Swift-BAT refined analysis
- GRB 090419: Swift/UVOT Observations
- Konus-Wind and Konus-RF observations of GRB 090408b
- GRB 090313: Zadko Telescope observations
- GRB 090309, Swift-BAT refined analysis
- GRB 090305, Swift-BAT refined analysis
- GRB 090301A: Swift-BAT refined analysis
- GRB 090113: Swift detection of a burst
- Swift triggered on the HMXB 1A 1118-61
- GRB 081221, Swift-BAT refined analysis
- Konus-Wind observation of GRB 081203B
- Konus-Wind observation of GRB 081126
- GRB 081118: Swift-BAT refined analysis
- GRB 081012: Fermi GBM detection
- Konus-Wind observation of GRB 081001
- GRB 080916C: Swift XRT refined analysis
- Swift-BAT/-XRT refined analysis on trigger 324362 (LS I +61 303)
- Swift trigger 324362 (LS I +61 303 ?): XRT
- Swift trigger 324362 (LS I +61 303 ?)
- GLAST Burst Monitor detection of GRB 080810
- GRB 080727B: REM prompt observations
- Konus-Wind observation of GRB 080605
- GRB 080514B: UVOT Observations
- Konus-Wind observation of GRB 080513
- Konus-Wind observation of GRB 080507
- VLA radio observations of GRB 080413A
- GRB080330: MAGIC telescope GeV observation
- GRB 080330, Swift-BAT refined analysis
- VLT/UVES redshift of GRB 080319B from FeII fine-structure lines
- Konus-Wind observation of GRB 080211
- GRB 071028: Swift-XRT Team refined analysis
- Konus-Wind observation of GRB 071020
- GRB 071020: Swift-XRT refined analysis
- GRB 071020: Swift detection of a bright burst
- GRB 071011: Confirmation of P60 optical afterglow
- GRB 071011: P60 Optical Afterglow Candidate
- GRB 071011, Swift-BAT refined analysis
- GRB 071011: Optical afterglow candidate
- Konus-Wind observation of GRB 071006
- GRB 071003: Keck HIRES spectroscopy
- GRB 070809: The Swift evidence for the SHB nature of this burst
- GRB 070714A: Swift/UVOT Upper limits
- GRB 070714: Swift detection of a bright burst, possibly short
- GRB 070621: Swift detection of a burst
- GRB 070610: Swift-UVOT Upper Limits
- GRB 070429B: Swift XRT refined analysis
- GRB 070412: Swift detection of a burst
- Konus-Wind and Konus-A observations of GRB 070220
- GRB070208 - SDSS Pre-Burst Observations
- GRB 070208: Early IR detection and afterglow astrometry
- GRB070208: Faulkes Telescope North Afterglow Identification
- Konus-Wind observation of GRB 061222A
- GRB 061201: UVOT Observations of a Fading Optical Afterglow
- GRB061126: Optical afterglow observations from MIRO
- GRB 061004: Swift/XRT Astrometry Correction
- GRB 060729: An update on the late-time Swift observations
- Konus-Wind observation of GRB 060904A
- Konus-Wind observation of GRB 060901
- GRB060729: analysis of XMM-Newton observation
- Swift-BAT trigger 215279 is not a GRB
- GRB 060526: Refined analysis of the Swift-BAT burst
- GRB 060522: Swift detection of a burst with possible optical afterglow
- GRB 060306: Swift-BAT refined analysis
- Konus-Wind observation of bright hard GRB 060213
- GRB 060211B: Swift/BAT refined analysis
- GRB 060210: Refined analysis of the Swift-BAT burst
- GRB 060202: Refined analysis of the Swift-BAT burst
- Konus-Wind observation of GRB 060124
- GRB 060117: PROMPT Observations
- GRB 060108: Refined XRT analysis
- GRB 051221B: Optical Observations with Kuiper 1.54m
- GRB 051221B: Refined analysis of the Swift-BAT burst
- Konus-Wind observation of GRB 051028
- Konus-Wind observation of GRB 051022
- GRB 050906, summary of radio observations
- GRB 051001: Swift Detection of a Burst
- GRB050922C: optical observation
- GRB 050827: Swift-BAT refined analysis
- GRB 050730: WSRT Radio Observations
- GRB050801: Swift-BAT detection of a burst
- GRB 050509b: Swift XRT Position
- IPN Summary of SGR1806-20 Activity in 2004
- IPN triangulation of GRB030413 (small error box)
- IPN triangulation of GRB021211B (two large error boxes)
- IPN triangulation of GRB020904
- IPN triangulation of GRB020715 (=GRB150702)
- IPN triangulation of GRB150702
- GRB020124 optical observations with RIBOTS/RIMOTS
- XRF/GRB 011030: Detection of the Probable Host Galaxy
- GRB 011030: TNG K-band observation
- XRF011030: J and K band observations
- XRF011030: Chandra Observations
- GRB 011030: K-band observations
- The X-ray Flash 011030 ('GRB 011030')
- GRB 011030, WSRT radio observations
- GRB011030 - further refinement WFC position
- GRB 011030, Radio observations
- GRB010220, Radio and Optical Observations
- GRB010213 (HETE) TAROT observations