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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"

27399 results found.

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

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