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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.

Advanced Search Examples (click to copy):

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

342 results found.

  1. GRB 070729: Swift-XRT refined analysis
  2. GRB 070520B: Swift-XRT refined analysis
  3. GRB 070520A: Swift-XRT refined analysis
  4. GRB070107: Swift/XRT refined analysis
  5. GRB061222B: Swift-XRT Refined Analysis
  6. GRB061025: Swift XRT refined analysis
  7. IGR J08408-4503 (= V* LM Vel): Swift detection of a transient
  8. GRB 060729: An update on the late-time Swift observations
  9. GRB 060926: Swift XRT refined analysis
  10. Two bright bursts from SGR 1806-20 detected with IBAS
  11. GRB060213: Swift XRT observations and possible afterglow candidate
  12. GRB060204a: Swift XRT Detection of an Afterglow Candidate
  13. Swift XRT Observation of GRB 060204C
  14. GRB060203: Swift XRT Team Refined Analysis
  15. Possible GRB 050922 detected by INTEGRAL
  16. GRB 050904: early Swift XRT analysis results
  17. GRB 050716: Refined XRT analysis.
  18. GRB 050509B: Swift/XRT refined analysis
  19. GRB 050502 - A long GRB detected with INTEGRAL
  20. SGR 1806-20, RHESSI observations of the 041227 giant flare
  21. GRB041220: Swift-BAT burst
  22. Swift-BAT detection of the bright long burst GRB041219
  23. GRB 041219 - A long GRB detected by INTEGRAL
  24. XMM-Newton Images of GRB 040827
  25. XRF040701: Second-Epoch Chandra Observations
  26. XRF040701: First-Epoch Chandra Observations
  27. GRB040511 (=H3218): A Long GRB Localized by HETE WXM and SXC
  28. GRBlog: Compilation of all GCN Circ. data
  29. IPN detection of renewed activity from SGR1806-20
  30. IPN triangulation of GRB030131 - CORRECTION
  31. IPN triangulation of GRB021119 (annulus)
  32. IPN triangulation of GRB021025 (annulus)
  33. GRB020813: optical afterglow
  34. Gemini IR Detection of AXP 1E 2259+586 Post-Burst
  35. SGR-like X-ray Bursts from AXP 1E 2259+586: follow-up
  36. AXP 1E2259+586: quasi-simultaneous optical observation
  37. AXP 1E2259+586 optical observations
  38. SGR-like Bursts from the AXP 1E 2259+586
  39. IPN triangulation of GRB020525
  40. SGR 1900+14, Chandra observations
  41. IPN triangulation of GRB 001004
  42. GRB 991216--Summary of RXTE Observations

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