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"43611 results found.
- GRB 130828A: Further Swift XRT observations
- GRB 130907A: Further Swift-BAT refined analysis
- GRB 130907A: INTEGRAL/SPI-ACS light curve
- Konus-Wind observation of GRB 130907A
- GRB 130907A, Swift-BAT refined analysis
- GRB 130907A: T21 optical observations
- GRB 130907A: VLA detection
- GRB 130907A: Swift-XRT refined Analysis
- GRB 130907A: Enhanced Swift-XRT position
- Errata of GRB name in GCN 15196: should have been GRB 130907A instead of GRB 120916A
- GRB 120916A: Fermi-LAT detection of a burst
- GRB 130907A: Swift/UVOT Detection
- GRB 130907A: Early Tautenburg detections, red afterglow
- GRB 130907A: Skynet DSO-14/Yerkes-41/GORT confirmation of a fading afterglow
- GRB 130907A: RATIR Optical and NIR Afterglow Confirmation
- GRB 130907A: Skynet DSO-14/Yerkes-41 detections of a possible afterglow
- GRB 130831A: Maidanak optical observations
- GRB 130831A: optical observation in Chuguev AO
- GRB 130831A: ISON-Kislovodsk optical observations
- GRB 130907A: NOT redshift
- GRB 130831A: optical observation in Gissar AO
- GRB 130831A: ISON-UAFO optical observations
- GRB 130907A: MASTER early OT observations
- GRB 130907A: Swift detection of a burst with an optical counterpart
- Swift follow-up results of the possible weak INTEGRAL GRB
- Swift follow-up of an INTEGRAL possible weak GRB
- GRB 130831A: RATIR Optical and NIR Upper Limits
- GRB 130822A: nearby galaxy redshifts
- GRB 130903A: GROND Afterglow Discovery
- GRB 130903A: MASTER early optical limit
- GRB 130903A: Fermi GBM observation
- GRB 130831A: JCMT SCUBA-2 sub-mm observation
- GRB 130903A: Swift-XRT observations
- Swift trigger 569022 is a new Galactic source Swift J1734.5-3027
- GRB 130903A: ISON-Kislovodsk optical Upper Limits
- GRB 130903A: GROND Upper Limits
- GRB 130903A: A long GRB detected by INTEGRAL
- GRB 130831A: Swift/UVOT Observations
- GRB 130831A: Optical Observations via Virtual Telescope, follow-up
- GRB 130831A: RATIR Optical and NIR Observations
- GRB 130831A: Continued Skynet/PROMPT-SSO, PROMPT-CTIO and Yerkes-41 detections
- GRB 130831B, Swift-BAT refined analysis
- GRB 130831A: VLA Observations
- GRB 130831A: T100 observations
- GRB 130831A: CARMA mm upper limit
- GRB 130831B: GROND upper limits
- Swift Trigger 569022: a possible GRB
- GRB 130831A: THO optical observation
- GRB 130831A, Swift-BAT refined analysis
- GRB 130831B: Swift-XRT refined Analysis
- GRB 130831A: optical observations
- GRB 130831A: Optical Observations via Virtual Telescope
- GRB 130831A: Swift-XRT refined Analysis
- GRB 130831B: Enhanced Swift-XRT position
- GRB 130831A: Skynet/PROMPT-SSO detections
- GRB 130831A: Enhanced Swift-XRT position
- GRB 130831A : Xinglong 60cm optical observation
- Konus-Wind observation of GRB 130831A
- GRB 130831A: Gemini-North Redshift
- GRB 130831B: Swift detection of a burst
- GRB 130831A: Faulkes Telescope North and South optical afterglow
- GRB 130831A: Swift detection of a burst with an optical counterpart
- IPN triangulation of GRB 130828A - error box
- GRB 130822A: optical upper limits
- GRB 130829A: AAO optical observations
- GRB 130828A: Swift XRT and UVOT observations
- GRB 130829A: NOT optical observations
- IPN triangulation of GRB 130828A
- GRB 130829A: Swift detection of a burst
- GRB 130828A Tiled Swift observations
- GRB 130828A: Fermi GBM detection
- GRB 130828A: Fermi-LAT detection of a burst
- IPN triangulation of GRB130821A
- GRB 130822A Swift-BAT Spectral lag analysis
- Konus-Wind observation of GRB 130821A
- GRB 130821A: Weihai optical upper limit
- GRB 130821A: Swift-XRT observation
- GRB 130822A: 5.8 GHz VLA upper limit
- GRB 130822A: Gemini Observations
- GRB 130822A: Swift-XRT refined Analysis
- GRB 130822A: WHT ACAM observations
- GRB 130822A: Swift/UVOT Upper Limits
- GRB 130822A: Enhanced Swift-XRT position
- GRB 130822A, Swift-BAT refined analysis
- GRB 130821A: Fermi-LAT detection of a burst
- GRB 130822A: Weihai optical upper limit
- GRB 130821A: Fermi GBM Detection
- GRB 130822A: Swift detection of a short burst
- Fermi Gamma-ray Burst Monitor trigger 398555975 / 130818916 is not a GRB
- GRB 130816B, Swift-BAT refined analysis
- GRB 130816B: GROND afterglow candidate
- GRB 130816A: Swift-XRT refined Analysis
- GRB 130816A, Swift-BAT refined analysis
- GRB 130816A: Fermi GBM observation
- GRB 130816B: Swift-XRT refined Analysis
- GRB 130816B: Enhanced Swift-XRT position
- GRB 130816A: GROND confirmation of afterglow
- GRB 130816A: Enhanced Swift-XRT position
- GRB 130816B: Swift detection of a burst
- GRB 130816A: REM NIR candidate afterglow