Skip to main content
Updates to LVK & CHIME Notices, Schema v7.2.3! See news and announcements

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"

28096 results found.

  1. GRB 060923, Swift-BAT refined analysis
  2. GRB 060923: UKIRT nIR observations - candidate afterglow
  3. GRB060923 - SDSS Pre-Burst Observations
  4. GRB 060923: Swift detection of a burst
  5. Swift detects a hard X-ray burst from AXP CXOU J164710.2-455216
  6. GRB 060919 : Faulkes South Telescope Observations
  7. GRB 060919, Swift-BAT refined analysis
  8. GRB060919: XRT refined analysis
  9. GRB 060919: TAROT optical observations
  10. GRB 060919: Swift detection of a burst
  11. GRB 060912A: VLA Observation
  12. GRB 060912A: Probable Host Galaxy
  13. GRB 060912, Swift-BAT refined analysis
  14. GRB 060912: Correction to GCN 5559
  15. GRB 060912: Swift detection of a burst with an optical afterglow
  16. VLA observations of GRB 060908
  17. GRB 060908, Swift-BAT refined analysis
  18. GRB 060908 - SDSS Pre-burst Observations
  19. GRB 060908: REM optical prompt observation
  20. GRB 060908: Swift detection of a burst with a bright optical counterpart
  21. GRB 060904A: Suzaku/WAM observation of the prompt emission
  22. GRB060906 , optical observation
  23. GRB 060906: Early RAPTOR optical limits
  24. GRB 060906, Swift-BAT refined spectral analysis
  25. GRB 060906: Swift/XRT Refined Analysis
  26. VLT redshift of GRB 060906
  27. GRB 060906, Swift-BAT refined analysis
  28. GRB 060906: Confirmation of P60 Optical Afterglow
  29. GRB 060906 (?): P60 Optical Afterglow Candidate
  30. GRB060904b, optical observations
  31. GRB060904A: Swift/UVOT optical observations
  32. GRB 060904A: Subaru NIR observation
  33. GRB 060904B: Swift-BAT refined analysis
  34. GRB 060904A: Refined analysis of the Swift-BAT burst
  35. GRB 060904A: Suzaku-XIS and -HXD observation plan
  36. GRB 060904A: P60 Observations
  37. GRB 060904B: Optical observations at Crni Vrh
  38. GRB 060904B: TAROT optical counterpart observations
  39. GRB060904B - SDSS Pre-Burst Observations
  40. GRB 060904: TAROT optical observations
  41. GRB 060904B: Swift detection of a burst with optical counterpart
  42. GRB060904 - SDSS Pre-Burst Observations
  43. GRB 060904: Swift detection of a bright burst
  44. GRB060901: Optical observations
  45. 060901: Swift UVOT followup observations
  46. GRB 060901: Swift/XRT Refined Analysis
  47. GRB 060901: Swift/XRT Position
  48. GRB 060901: a long GRB detected by INTEGRAL
  49. Two bright bursts from SGR 1806-20 detected with IBAS
  50. GRB 060605, observations using an Integral Field Unit
  51. GRB 060604: VLA Observation
  52. GRB 060814: Suzaku/WAM observation of the prompt emission
  53. GRB 060605: VLA Observation
  54. GRB 060707: VLA observation
  55. GRB 060825: VLA observations
  56. GRB060826 - SDSS Pre-Burst Observations
  57. GRB 060826(?): Swift detection of a possible burst
  58. GRB 060825: XRT Team Refined Analysis
  59. GRB 060825: Swift-BAT Refined Analysis
  60. GRB 060813: Swift/BAT, Konus-Wind, and Suzaku/WAM joint prompt spectral analysis
  61. GRB 060825: TNG optical observations
  62. GRB 060825: TAROT optical observations
  63. GRB 060825: P60 Observations
  64. GRB 060825: Swift detection of a burst
  65. GRB060801: host galaxy redshift
  66. GRB060729: analysis of XMM-Newton observation
  67. GRB 060729, SMARTS optical/IR observations
  68. GRB 060813: A long, bright GRB detected with Suzaku WAM
  69. Konus-Wind observation of GRB 060814
  70. GRB 060814: Refined analysis of the Swift-BAT burst
  71. GRB 060814: P60 Observations
  72. GRB 060814: P200 NIR Observations
  73. GRB060805B: optical observations
  74. GRB 060814: Swift XRT refined analysis
  75. GRB 060814: VLT optical limits
  76. GRB 060814 - SDSS Pre-Burst Observations
  77. GRB 060814: TAROT optical observations
  78. GRB 060814: Swift detection of a bright burst
  79. Konus-Wind observation of GRB 060813
  80. GRB 060813: Swift XRT refined analysis
  81. GRB 060813: Refined analysis of the Swift-BAT burst
  82. GRB 060813: Swift detection of a burst
  83. GRB051109B: Late-time Radio Observations
  84. Swift detection of an outburst from the 4U 1246-58 LMXB burster
  85. GRB060807: Possible Highly Significant X-ray Emission Lines
  86. GRB 060729: An update on the Swift XRT and UVOT observations
  87. GRB060717: optical observations
  88. GRB060807: Optical limiting magnitudes
  89. GRB 060805B: XRT Team Analysis
  90. GRB060806 is similar to previous activity of SGR1806-20
  91. GRB 060807: XRT Team refined analysis
  92. GRB 060807: Refined analysis of the Swift-BAT burst
  93. GRB060807: optical afterglow candidate
  94. IPN triangulation of GRB060806 (long, exceptionally bright)
  95. GRB060807 - SDSS Pre-burst Observations
  96. GRB 060805B: X-ray Afterglow Detection, Spectral/Spatial/Temporal Properties
  97. GRB 060805B: Swift/UVOT Upper Limits
  98. GRB 060807, optical observation
  99. GRB 060807: Kanazawa R-band observation
  100. GRB 060807: Swift detection of a burst

Advanced

Download all Circulars as a .tar.gz archive (updated once a day):
Questions or comments?
Contact GCN directly.
Have you found a bug in GCN?
Open an issue.
Want to contribute code to GCN?
Get involved on GitHub.

gcn.nasa.gov

A service of the Astrophysics Science Division at NASA Goddard Space Flight Center

Looking for U.S. government information and services? Visit USA.gov