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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"

28089 results found.

  1. GRB060919: XRT refined analysis
  2. GRB 060919: TAROT optical observations
  3. GRB 060919: Swift detection of a burst
  4. GRB 060912A: VLA Observation
  5. GRB 060912A: Probable Host Galaxy
  6. GRB 060912, Swift-BAT refined analysis
  7. GRB 060912: Correction to GCN 5559
  8. GRB 060912: Swift detection of a burst with an optical afterglow
  9. VLA observations of GRB 060908
  10. GRB 060908, Swift-BAT refined analysis
  11. GRB 060908 - SDSS Pre-burst Observations
  12. GRB 060908: REM optical prompt observation
  13. GRB 060908: Swift detection of a burst with a bright optical counterpart
  14. GRB 060904A: Suzaku/WAM observation of the prompt emission
  15. GRB060906 , optical observation
  16. GRB 060906: Early RAPTOR optical limits
  17. GRB 060906, Swift-BAT refined spectral analysis
  18. GRB 060906: Swift/XRT Refined Analysis
  19. VLT redshift of GRB 060906
  20. GRB 060906, Swift-BAT refined analysis
  21. GRB 060906: Confirmation of P60 Optical Afterglow
  22. GRB 060906 (?): P60 Optical Afterglow Candidate
  23. GRB060904b, optical observations
  24. GRB060904A: Swift/UVOT optical observations
  25. GRB 060904A: Subaru NIR observation
  26. GRB 060904B: Swift-BAT refined analysis
  27. GRB 060904A: Refined analysis of the Swift-BAT burst
  28. GRB 060904A: Suzaku-XIS and -HXD observation plan
  29. GRB 060904A: P60 Observations
  30. GRB 060904B: Optical observations at Crni Vrh
  31. GRB 060904B: TAROT optical counterpart observations
  32. GRB060904B - SDSS Pre-Burst Observations
  33. GRB 060904: TAROT optical observations
  34. GRB 060904B: Swift detection of a burst with optical counterpart
  35. GRB060904 - SDSS Pre-Burst Observations
  36. GRB 060904: Swift detection of a bright burst
  37. GRB060901: Optical observations
  38. 060901: Swift UVOT followup observations
  39. GRB 060901: Swift/XRT Refined Analysis
  40. GRB 060901: Swift/XRT Position
  41. GRB 060901: a long GRB detected by INTEGRAL
  42. Two bright bursts from SGR 1806-20 detected with IBAS
  43. GRB 060605, observations using an Integral Field Unit
  44. GRB 060604: VLA Observation
  45. GRB 060814: Suzaku/WAM observation of the prompt emission
  46. GRB 060605: VLA Observation
  47. GRB 060707: VLA observation
  48. GRB 060825: VLA observations
  49. GRB060826 - SDSS Pre-Burst Observations
  50. GRB 060826(?): Swift detection of a possible burst
  51. GRB 060825: XRT Team Refined Analysis
  52. GRB 060825: Swift-BAT Refined Analysis
  53. GRB 060813: Swift/BAT, Konus-Wind, and Suzaku/WAM joint prompt spectral analysis
  54. GRB 060825: TNG optical observations
  55. GRB 060825: TAROT optical observations
  56. GRB 060825: P60 Observations
  57. GRB 060825: Swift detection of a burst
  58. GRB060801: host galaxy redshift
  59. GRB060729: analysis of XMM-Newton observation
  60. GRB 060729, SMARTS optical/IR observations
  61. GRB 060813: A long, bright GRB detected with Suzaku WAM
  62. Konus-Wind observation of GRB 060814
  63. GRB 060814: Refined analysis of the Swift-BAT burst
  64. GRB 060814: P60 Observations
  65. GRB 060814: P200 NIR Observations
  66. GRB060805B: optical observations
  67. GRB 060814: Swift XRT refined analysis
  68. GRB 060814: VLT optical limits
  69. GRB 060814 - SDSS Pre-Burst Observations
  70. GRB 060814: TAROT optical observations
  71. GRB 060814: Swift detection of a bright burst
  72. Konus-Wind observation of GRB 060813
  73. GRB 060813: Swift XRT refined analysis
  74. GRB 060813: Refined analysis of the Swift-BAT burst
  75. GRB 060813: Swift detection of a burst
  76. GRB051109B: Late-time Radio Observations
  77. Swift detection of an outburst from the 4U 1246-58 LMXB burster
  78. GRB060807: Possible Highly Significant X-ray Emission Lines
  79. GRB 060729: An update on the Swift XRT and UVOT observations
  80. GRB060717: optical observations
  81. GRB060807: Optical limiting magnitudes
  82. GRB 060805B: XRT Team Analysis
  83. GRB060806 is similar to previous activity of SGR1806-20
  84. GRB 060807: XRT Team refined analysis
  85. GRB 060807: Refined analysis of the Swift-BAT burst
  86. GRB060807: optical afterglow candidate
  87. IPN triangulation of GRB060806 (long, exceptionally bright)
  88. GRB060807 - SDSS Pre-burst Observations
  89. GRB 060805B: X-ray Afterglow Detection, Spectral/Spatial/Temporal Properties
  90. GRB 060805B: Swift/UVOT Upper Limits
  91. GRB 060807, optical observation
  92. GRB 060807: Kanazawa R-band observation
  93. GRB 060807: Swift detection of a burst
  94. GRB060805 Liverpool Telescope observations
  95. GRB 060805: XRT Team Refined Analysis
  96. GRB 060805: Swift-BAT Refined Analysis
  97. GRB 060805: Swift/UVOT Upper Limits
  98. GRB 060805: P60 Observations
  99. GRB 060805 - SDSS Pre-Burst Observations
  100. GRB 060804: Swift UVOT observations

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