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"19533 results found.
- GRB 120722A: Swift-XRT refined Analysis
- GRB 120722A: Swift-BAT refined analysis
- GRB 120722A: Enhanced Swift-XRT position
- GRB 120722A: Swift detection of a burst
- GRB 120716A: EVLA Detection
- GRB 120716A: Swift-XRT detection
- GRB 120716A: Swift/XRT position consistent with that of the optical counterpart
- GRB 120716A: GROND confirmation of the optical/NIR afterglow
- GRB 120714B: Swift/UVOT Detection
- GRB 120714B: Swift-XRT refined Analysis
- GRB120714A: Swift/UVOT upper limits
- GRB 120714B: Swift-BAT refined analysis
- Swift-BAT refined analysis of 1E 1841-045 (Trigger=526660)
- GRB 120714A: GROND upper limits
- GRB 120714B: GROND confirmation of fading afterglow
- GRB 120714A: Swift-XRT refined Analysis
- Trigger 526660: Swift detection of 1 E 1841-045 (aka Kes 73)
- GRB 120714B: Position Correction and Candidate Optical Afterglow
- GRB 120714A: Swift-BAT refined analysis
- GRB 120714B: Swift detection of a burst
- GRB 120714A: Enhanced Swift-XRT position
- GRB 120712A: Fermi GBM observation
- GRB120714A: UVOT non-detection
- GRB 120714A: Swift-XRT observations
- GRB 120714A: Swift detection of a burst
- IPN Triangulation of GRB 120709A
- GRB 120712A: Swift/UVOT Detection
- GRB 120712A: Swift-XRT refined Analysis
- GRB 120712A: GROND Detection of the Optical/NIR Afterglow Candidate and photo-z
- GRB 120712A: Enhanced Swift-XRT position
- GRB 120712A: Swift-BAT refined analysis
- GRB 120712A: Swift detection of a burst with optical afterglow
- GRB 120711B: Swift-XRT refined Analysis
- GRB 120711B: Swift-BAT refined analysis
- GRB 120711B: Swift/UVOT Upper Limits
- GRB 120711A: Swift/UVOT Observations
- GRB 120709A: Swift/UVOT Observations
- GRB 120711A: Fermi LAT detection
- GRB 120711A: Swift-XRT observations
- Swift detection of GRB 120711B or a new Galactic transient
- GRB 120709A: Swift-XRT observations
- IPN Triangulation of GRB 120707A
- GRB 120709A: Fermi-LAT Detection
- GRB 120703A: Swift/UVOT Detection
- GRB 120703A: Fermi GBM detection
- GRB 120703A: Swift-XRT refined Analysis
- GRB 120703A: Enhanced Swift-XRT position
- GRB 120703A: Swift-BAT refined analysis
- GRB 120624B Suzaku WAM observation of the prompt emission
- Konus-Wind observation of GRB 120703A
- GRB 120701A: Swift/UVOT Detection
- GRB 120701A: GROND detection of the afterglow
- GRB 120703A: Swift detection of a bright burst with an optical afterglow
- Swift Trigger 525554 is noise
- GRB 120701A: Swift-XRT afterglow detection and analysis
- GRB 120630A: Swift-BAT/-XRT/-UVOT refined analysis
- GRB 120701A: Swift-BAT refined analysis
- GRB 120630A: NOT optical source within the XRT error circle
- Swift Trigger 525554 is probably not a GRB
- GRB120624B: Chandra observations and afterglow detection
- GRB 120624B Further Swift-XRT analysis
- GRB 120624B: Swift/UVOT Upper Limits
- Watcher follow-up observations of IGR J17062-6143 (Swift trigger 525148)
- GRB 120624B: Swift-XRT observations
- GRB 120624B: GROND upper limits
- GRB 120624B: NIR counterpart candidate from HAWKI
- Skynet/PROMPT observations of IGR J17062-6143 (Swift trigger 525148)
- GRB 120624B: Discussion of Fermi and Swift measurements and future Swift observations
- Swift detection of Ginga 0834-430
- GRB 120624B: NOT optical upper limit
- Swift detection of IGR J17062-6143
- GRB 120624B: optical observations
- GRB 120624B, Swift-BAT refined analysis
- GRB 120624B: Swift detection of a burst
- GRB 120624B: Fermi-LAT Detection
- IPN Triangulation of GRB 120624A (short/intense)
- Swift Trigger 524949: Noise fluctuation near a galaxy
- Swift trigger 524642 / SwJ1910.2-0546
- GRB 120602A: Suzaku WAM observation of the prompt emission
- Swift Trigger 524642 is Swift J1910.2-0546
- Trigger 524584: Swift detection of Algol
- Swift triggers (#524542) on a Galactic source
- IPN Triangulation of GRB 120602A (long/very bright)
- GRB 120612A: Swift/UVOT observations
- GRB 120612A: Swift-XRT refined Analysis
- GRB 120612A: Swift-BAT refined analysis
- GRB 120612A: Enhanced Swift-XRT position
- GRB 120612A: BOOTES-3 optical upper limit
- GRB 120612A: Swift detection of a burst
- GRB 120603A: Suzaku WAM observation of the prompt emission
- GRB 120519A: Suzaku WAM observation of the prompt emission
- GRB 120512A: Suzaku WAM observation of the prompt emission
- GRB 120521C: EVLA Localization of Afterglow
- GRB 120521C: EVLA 22 GHz Detection
- GRB 120521B: Fermi GBM observation
- GRB 120521C: Early Tautenburg limits
- GRB 120521C: EVLA 22 GHz Upper Limit
- GRB 120521A: GROND Upper limits
- GRB 120521C: Swift-XRT refined Analysis
- GRB 120521C: Swift-BAT refined analysis