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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"

28091 results found.

  1. GRB 060919 : Faulkes South Telescope Observations
  2. GRB 060919, Swift-BAT refined analysis
  3. GRB060919: XRT refined analysis
  4. GRB 060919: TAROT optical observations
  5. GRB 060919: Swift detection of a burst
  6. GRB 060912A: VLA Observation
  7. GRB 060912A: Probable Host Galaxy
  8. GRB 060912, Swift-BAT refined analysis
  9. GRB 060912: Correction to GCN 5559
  10. GRB 060912: Swift detection of a burst with an optical afterglow
  11. VLA observations of GRB 060908
  12. GRB 060908, Swift-BAT refined analysis
  13. GRB 060908 - SDSS Pre-burst Observations
  14. GRB 060908: REM optical prompt observation
  15. GRB 060908: Swift detection of a burst with a bright optical counterpart
  16. GRB 060904A: Suzaku/WAM observation of the prompt emission
  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. VLT redshift of GRB 060906
  22. GRB 060906, Swift-BAT refined analysis
  23. GRB 060906: Confirmation of P60 Optical Afterglow
  24. GRB 060906 (?): P60 Optical Afterglow Candidate
  25. GRB060904b, optical observations
  26. GRB060904A: Swift/UVOT optical observations
  27. GRB 060904A: Subaru NIR observation
  28. GRB 060904B: Swift-BAT refined analysis
  29. GRB 060904A: Refined analysis of the Swift-BAT burst
  30. GRB 060904A: Suzaku-XIS and -HXD observation plan
  31. GRB 060904A: P60 Observations
  32. GRB 060904B: Optical observations at Crni Vrh
  33. GRB 060904B: TAROT optical counterpart observations
  34. GRB060904B - SDSS Pre-Burst Observations
  35. GRB 060904: TAROT optical observations
  36. GRB 060904B: Swift detection of a burst with optical counterpart
  37. GRB060904 - SDSS Pre-Burst Observations
  38. GRB 060904: Swift detection of a bright burst
  39. GRB060901: Optical observations
  40. 060901: Swift UVOT followup observations
  41. GRB 060901: Swift/XRT Refined Analysis
  42. GRB 060901: Swift/XRT Position
  43. GRB 060901: a long GRB detected by INTEGRAL
  44. Two bright bursts from SGR 1806-20 detected with IBAS
  45. GRB 060605, observations using an Integral Field Unit
  46. GRB 060604: VLA Observation
  47. GRB 060814: Suzaku/WAM observation of the prompt emission
  48. GRB 060605: VLA Observation
  49. GRB 060707: VLA observation
  50. GRB 060825: VLA observations
  51. GRB060826 - SDSS Pre-Burst Observations
  52. GRB 060826(?): Swift detection of a possible burst
  53. GRB 060825: XRT Team Refined Analysis
  54. GRB 060825: Swift-BAT Refined Analysis
  55. GRB 060813: Swift/BAT, Konus-Wind, and Suzaku/WAM joint prompt spectral analysis
  56. GRB 060825: TNG optical observations
  57. GRB 060825: TAROT optical observations
  58. GRB 060825: P60 Observations
  59. GRB 060825: Swift detection of a burst
  60. GRB060801: host galaxy redshift
  61. GRB060729: analysis of XMM-Newton observation
  62. GRB 060729, SMARTS optical/IR observations
  63. GRB 060813: A long, bright GRB detected with Suzaku WAM
  64. Konus-Wind observation of GRB 060814
  65. GRB 060814: Refined analysis of the Swift-BAT burst
  66. GRB 060814: P60 Observations
  67. GRB 060814: P200 NIR Observations
  68. GRB060805B: optical observations
  69. GRB 060814: Swift XRT refined analysis
  70. GRB 060814: VLT optical limits
  71. GRB 060814 - SDSS Pre-Burst Observations
  72. GRB 060814: TAROT optical observations
  73. GRB 060814: Swift detection of a bright burst
  74. Konus-Wind observation of GRB 060813
  75. GRB 060813: Swift XRT refined analysis
  76. GRB 060813: Refined analysis of the Swift-BAT burst
  77. GRB 060813: Swift detection of a burst
  78. GRB051109B: Late-time Radio Observations
  79. Swift detection of an outburst from the 4U 1246-58 LMXB burster
  80. GRB060807: Possible Highly Significant X-ray Emission Lines
  81. GRB 060729: An update on the Swift XRT and UVOT observations
  82. GRB060717: optical observations
  83. GRB060807: Optical limiting magnitudes
  84. GRB 060805B: XRT Team Analysis
  85. GRB060806 is similar to previous activity of SGR1806-20
  86. GRB 060807: XRT Team refined analysis
  87. GRB 060807: Refined analysis of the Swift-BAT burst
  88. GRB060807: optical afterglow candidate
  89. IPN triangulation of GRB060806 (long, exceptionally bright)
  90. GRB060807 - SDSS Pre-burst Observations
  91. GRB 060805B: X-ray Afterglow Detection, Spectral/Spatial/Temporal Properties
  92. GRB 060805B: Swift/UVOT Upper Limits
  93. GRB 060807, optical observation
  94. GRB 060807: Kanazawa R-band observation
  95. GRB 060807: Swift detection of a burst
  96. GRB060805 Liverpool Telescope observations
  97. GRB 060805: XRT Team Refined Analysis
  98. GRB 060805: Swift-BAT Refined Analysis
  99. GRB 060805: Swift/UVOT Upper Limits
  100. GRB 060805: P60 Observations

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