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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"

28043 results found.

  1. GRB 060930: near-IR afterglow candidate
  2. GRB 061002: Swift-XRT Team Refined Analysis
  3. VLA observations of GRB 060926
  4. GRB061002 - SDSS Pre-Burst Observations
  5. GRB 061002, Swift-BAT refined analysis
  6. GRB 060908: Detection of a possible host
  7. GRB 060807: Detection of a possible host galaxy
  8. GRB 060923A: VLA K-band Observations
  9. GRB 060930: Xinglong TNT optical observations
  10. GRB 060929: Further XRT Refined Analysis
  11. GRB 060929: Swift/UVOT Optical Observations
  12. GRB 060930: A long X-ray rich GRB detected by INTEGRAL
  13. GRB060929: Swift-XRT refined analysis.
  14. GRB 060929: TNG K-band observations
  15. GRB 060929, Swift-BAT refined analysis
  16. GRB060929: Optical limit
  17. Liverpool Telescope observations of GRB 060929
  18. GRB060908: optical observations
  19. GRB 060927: Swift/UVOT Optical Observations
  20. GRB 060927: Swift XRT Team refined analysis
  21. GRB 060927 optical limit
  22. GRB 060927, Swift-BAT refined analysis
  23. GRB 060927: Xinglong TNT optical observations
  24. GRB 060927, optical observation
  25. GRB060927 - SDSS Pre-Burst Observations
  26. Swift XRT boresight
  27. GRB060926: VLT redshift
  28. GRB 060926: Swift-UVOT Detections
  29. GRB 060923A: Schedule of Spitzer Space Telescope Observations
  30. GRB 060926, Swift-BAT refined analysis
  31. GRB 060923A: Radio Observations
  32. GRB 060926: RTT150, UVOT afterglow candidate confirmation
  33. GRB 060926: Swift detection of a burst
  34. GRB 060923C, Swift-BAT refined analysis
  35. GRB 060923C: VLA Observation
  36. GRB 060923C: NIR afterglow confirmed
  37. GRB060923C: AROMA optical obsevation
  38. GRB 060923C, optical observation
  39. GRB 060923A: Gemini Second Epoch and Afterglow Confirmation
  40. GRB 060923C: VLT J-band observations
  41. GRB 060923B: Swift XRT Refined Analysis
  42. GRB 060923A: Swift XRT refined analysis
  43. GRB 060923A: Keck and Gemini Observations
  44. GRB 060923C: Xinglong TNT optical observations
  45. GRB 060923B, Swift-BAT refined analysis
  46. GRB 060923C: Swift detection of a burst
  47. GRB 060923B: Swift detection of a burst
  48. GRB 060923, Swift-BAT refined analysis
  49. GRB 060923: UKIRT nIR observations - candidate afterglow
  50. GRB060923 - SDSS Pre-Burst Observations
  51. GRB 060923: Swift detection of a burst
  52. Swift detects a hard X-ray burst from AXP CXOU J164710.2-455216
  53. GRB 060919 : Faulkes South Telescope Observations
  54. GRB 060919, Swift-BAT refined analysis
  55. GRB060919: XRT refined analysis
  56. GRB 060919: TAROT optical observations
  57. GRB 060919: Swift detection of a burst
  58. GRB 060912A: VLA Observation
  59. GRB 060912A: Probable Host Galaxy
  60. GRB 060912, Swift-BAT refined analysis
  61. GRB 060912: Correction to GCN 5559
  62. GRB 060912: Swift detection of a burst with an optical afterglow
  63. VLA observations of GRB 060908
  64. GRB 060908, Swift-BAT refined analysis
  65. GRB 060908 - SDSS Pre-burst Observations
  66. GRB 060908: REM optical prompt observation
  67. GRB 060908: Swift detection of a burst with a bright optical counterpart
  68. GRB 060904A: Suzaku/WAM observation of the prompt emission
  69. GRB060906 , optical observation
  70. GRB 060906: Early RAPTOR optical limits
  71. GRB 060906, Swift-BAT refined spectral analysis
  72. GRB 060906: Swift/XRT Refined Analysis
  73. VLT redshift of GRB 060906
  74. GRB 060906, Swift-BAT refined analysis
  75. GRB 060906: Confirmation of P60 Optical Afterglow
  76. GRB 060906 (?): P60 Optical Afterglow Candidate
  77. GRB060904b, optical observations
  78. GRB060904A: Swift/UVOT optical observations
  79. GRB 060904A: Subaru NIR observation
  80. GRB 060904B: Swift-BAT refined analysis
  81. GRB 060904A: Refined analysis of the Swift-BAT burst
  82. GRB 060904A: Suzaku-XIS and -HXD observation plan
  83. GRB 060904A: P60 Observations
  84. GRB 060904B: Optical observations at Crni Vrh
  85. GRB 060904B: TAROT optical counterpart observations
  86. GRB060904B - SDSS Pre-Burst Observations
  87. GRB 060904: TAROT optical observations
  88. GRB 060904B: Swift detection of a burst with optical counterpart
  89. GRB060904 - SDSS Pre-Burst Observations
  90. GRB 060904: Swift detection of a bright burst
  91. GRB060901: Optical observations
  92. 060901: Swift UVOT followup observations
  93. GRB 060901: Swift/XRT Refined Analysis
  94. GRB 060901: Swift/XRT Position
  95. GRB 060901: a long GRB detected by INTEGRAL
  96. Two bright bursts from SGR 1806-20 detected with IBAS
  97. GRB 060605, observations using an Integral Field Unit
  98. GRB 060604: VLA Observation
  99. GRB 060814: Suzaku/WAM observation of the prompt emission
  100. GRB 060605: VLA Observation

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