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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').
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.

Lucene Examples (click to copy):

subject:"Swift"
body:"GRB"
submitter:"Judith Racusin"

43 results found.

  1. GRB 221009A X-ray light-curve and the indication of TeV light-curve
  2. GRB 190829A observations in CrAO, photometry of the SN
  3. GRB 190829A: GTC confirmation of an associated Type Ic-BL Supernova
  4. GRB 190829A: ATCA cm-band detection
  5. GRB 190829A optical observation
  6. GRB190829A: Keck LRIS spectroscopic confirmation of the accompanying supernova
  7. Konus-Wind observation of GRB 190829A
  8. GRB 190829A: Liverpool Telescope observations of a slow supernova rise
  9. GRB 190829A: MASTER confirmation of GROND SN
  10. GRB190829A: GROND detection of the accompanying SN
  11. GRB 190829A: LCO Optical Afterglow Detection
  12. GRB 190829A: MeerKAT radio observation
  13. GRB 190829A: Detection of radio afterglow with the uGMRT
  14. GRB 190829A: Flattening of optical light curve from continued Liverpool Telescope photometry
  15. GRB 190829A: Continued fading inferred from Liverpool Telescope photometry
  16. GRB 190829A: Keck LRIS spectroscopy of the optical afterglow
  17. GRB 190829A: Liverpool Telescope observations
  18. GRB 190829A: TNG imaging of the NIR afterglow
  19. GRB 190829A: NOEMA detection of the mm afterglow
  20. GRB 190829A: Liverpool Telescope optical photometry
  21. GRB 190829A: UKIRT detection of the NIR Afterglow
  22. GRB 190829A: MMT detection of the optical afterglow
  23. GRB 190829A: No Neutrino Counterpart detected with ANTARES
  24. GRB 190829A: Follow up VLA and VLBI radio observations urged
  25. GRB 190829A: KAIT Detection of the Optical Afterglow
  26. GRB 190829A, Swift-BAT refined analysis
  27. GRB 190829A: AGILE-GRID upper limits
  28. GRB 190829A: AGILE ratemeters detection and MCAL upper limits
  29. GRB 190829A: Fermi GBM detection
  30. GRB 190829A: Fermi-LAT Upper Limits
  31. GRB 190829A:: Global MASTER-net optical clear and polarization observations scheduler and some spiculations
  32. GRB 190829A: Swift/UVOT detection of an optical afterglow with a rise
  33. GRB 190829A: GROND detection of the Optical/NIR Afterglow
  34. GRB 190829A: Swift-XRT refined Analysis
  35. GRB 190829A: Enhanced Swift-XRT position
  36. GRB190829A: Detection of VHE gamma-ray emission with H.E.S.S.
  37. GRB 190829A: 10.4m GTC spectroscopy
  38. GRB 190829A: NOT optical afterglow detection and spectroscopy
  39. GRB 190829A: GROWTH India detection of afterglow
  40. GRB 190829A:: MASTER-net bright and decay OT detection
  41. GRB 190829A: Dabancheng-0.5m optical afterglow detection
  42. GRB 190829A: Swift detection of a burst consistent with a galaxy at z=0.08
  43. GRB 190829A: Fermi GBM Final Real-time Localization

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