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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"

25845 results found.

  1. GRB 060919 : Faulkes South Telescope Observations
  2. GRB060919: XRT refined analysis
  3. GRB 060919: TAROT optical observations
  4. GRB 060919: Swift detection of a burst
  5. GRB 060912A: VLA Observation
  6. GRB 060912A: Probable Host Galaxy
  7. GRB060825: MAGIC telescope GeV observation
  8. Konus-Wind observation of GRB 060912
  9. GRB 060912: Swift XRT Team Refined Analysis
  10. GRB 060912: Correction to GCN 5559
  11. VLA observations of GRB 060908
  12. GRB 060908: redshift
  13. GRB 060908, Swift/XRT refined analysis
  14. GRB 060908 - SDSS Pre-burst Observations
  15. GRB 060908: REM optical prompt observation
  16. GRB 060908: Swift detection of a burst with a bright optical counterpart
  17. GRB060906 , optical observation
  18. GRB 060906: Early RAPTOR optical limits
  19. GRB 060906, Swift-BAT refined spectral analysis
  20. GRB 060906: Swift/XRT Refined Analysis
  21. GRB 060906: KAIT observations
  22. GRB 060906: Confirmation of P60 Optical Afterglow
  23. GRB 060906 (?): P60 Optical Afterglow Candidate
  24. GRB 060904A Milagro GeV/TeV Observations
  25. GRB060904b, optical observations
  26. GRB 060904B: RTT150 optical observations
  27. GRB060904A: Swift/UVOT optical observations
  28. GRB 060904A: Subaru NIR observation
  29. GRB 060904B: Swift-BAT refined analysis
  30. Konus-Wind observation of GRB 060904A
  31. GRB 060904B: Swift-XRT refined analysis
  32. GRB 060904A: Refined analysis of the Swift-BAT burst
  33. GRB 060904A: Swift-XRT refined analysis
  34. GRB 060904A: Suzaku-XIS and -HXD observation plan
  35. GRB 060904A: P60 Observations
  36. GRB 060904B: Optical observations at Crni Vrh
  37. GRB 060904B: TAROT optical counterpart observations
  38. GRB060904B - SDSS Pre-Burst Observations
  39. GRB 060904: TAROT optical observations
  40. GRB 060904B: Swift detection of a burst with optical counterpart
  41. GRB060904 - SDSS Pre-Burst Observations
  42. GRB 060904: Swift detection of a bright burst
  43. GRB060901: Optical observations
  44. 060901: Swift UVOT followup observations
  45. Konus-Wind observation of GRB 060901
  46. GRB 060901: Swift/XRT Refined Analysis
  47. Two bright bursts from SGR 1806-20 detected with IBAS
  48. GRB 060605, observations using an Integral Field Unit
  49. GRB 060604: VLA Observation
  50. GRB 060814: Suzaku/WAM observation of the prompt emission
  51. GRB 060605: VLA Observation
  52. GRB 060707: VLA observation
  53. GRB 060825: VLA observations
  54. GRB060826 - SDSS Pre-Burst Observations
  55. GRB 060826(?): Swift detection of a possible burst
  56. GRB 060825: XRT Team Refined Analysis
  57. GRB 060813: Swift/BAT, Konus-Wind, and Suzaku/WAM joint prompt spectral analysis
  58. GRB060825: Liverpool Telescope optical observations
  59. GRB 060825: TNG optical observations
  60. GRB 060825: TAROT optical observations
  61. GRB 060825: P60 Observations
  62. GRB060729: analysis of XMM-Newton observation
  63. GRB 060729, SMARTS optical/IR observations
  64. Konus-Wind observation of GRB 060814
  65. GRB 060814: P60 Observations
  66. GRB 060814: P200 NIR Observations
  67. GRB 060813: pseudo-z from spectral parameters of the prompt
  68. GRB 060814: Swift XRT refined analysis
  69. GRB 060814: VLT optical limits
  70. GRB 060814 - SDSS Pre-Burst Observations
  71. GRB 060814: TAROT optical observations
  72. GRB 060814: Swift detection of a bright burst
  73. GRB 060813: Swift XRT refined analysis
  74. GRB 060813: Swift detection of a burst
  75. GRB051109B: Late-time Radio Observations
  76. Swift detection of an outburst from the 4U 1246-58 LMXB burster
  77. GRB060807: Possible Highly Significant X-ray Emission Lines
  78. GRB 060729: An update on the Swift XRT and UVOT observations
  79. GRB060717: optical observations
  80. GRB060807: Optical limiting magnitudes
  81. GRB 060805B: XRT Team Analysis
  82. GRB060806 is similar to previous activity of SGR1806-20
  83. GRB 060807: XRT Team refined analysis
  84. GRB060807: optical afterglow candidate
  85. GRB 060805B: RHESSI Spectral Fit
  86. IPN triangulation of GRB060806 (long, exceptionally bright)
  87. GRB060807 - SDSS Pre-burst Observations
  88. GRB 060805B: X-ray Afterglow Detection, Spectral/Spatial/Temporal Properties
  89. GRB 060805B: Swift/UVOT Upper Limits
  90. GRB 060807, optical observation
  91. GRB 060807: Kanazawa R-band observation
  92. GRB 060807: Swift detection of a burst
  93. GRB060805 Liverpool Telescope observations
  94. GRB 060805: XRT Team Refined Analysis
  95. GRB 060805: Swift/UVOT Upper Limits
  96. GRB 060805: P60 Observations
  97. GRB 060805 - SDSS Pre-Burst Observations
  98. GRB 060804: Swift UVOT observations
  99. GRB 060804: Swift-XRT Team Refined Analysis
  100. GRB 060804: Refined analysis of the Swift-BAT burst

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