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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"

26334 results found.

  1. GRB 060124: Optical Observations at Tautenburg
  2. GRB 060117: Suzaku WAM observation of the prompt emission
  3. GRB 060111B: Suzaku WAM observation of the prompt emission
  4. GRB 060124: Swift-BAT detection of a burst
  5. GRB 060121: Liverpool Telescopes optical limits
  6. GRB 060121: Swift XRT refined analysis
  7. Konus-Wind observation of GRB 060121
  8. GRB 060121: candidate optical counterpart
  9. GRB 060121: Infrared Observations
  10. GRB 060121: optical observations
  11. GRB 060121: Optical imaging
  12. GRB060121 - SDSS pre-burst observations
  13. HETE Alert 4006: MASTER promt optical limit
  14. GRB060117 - ATCA 3/6cm radio limits - correction
  15. GRB060117 - ATCA 3/6cm radio limits
  16. GRB 060116: photometric redshift - the farthest GRB?
  17. Konus-Wind observation of GRB 060117
  18. GRB 060116: UKIRT IR Observations
  19. GRB 060117: Refined analysis of the Swift-BAT burst
  20. GRB 060117: FRAM optical afterglow candidate
  21. GRB 060117: nearby galaxy
  22. GRB 060116: VLT optical observations
  23. GRB 060116: Refined analysis of the Swift-BAT burst
  24. GRB 060116: XRT refined analysis
  25. GRB 060116: IR Candidate Afterglow
  26. GRB 060116: Swift/UVOT upper limits
  27. GRB060115: REM observations
  28. GRB 060110: XRT position and analysis
  29. GRB 060116 : Lulin optical limit
  30. GRB060116: Faulkes North observation
  31. GRB 060116: Swift-BAT detection of a burst
  32. GRB 060115: Refined analysis of the Swift-BAT burst
  33. GRB 060115: Swift/UVOT upper limits
  34. GRB 060114: REM observations
  35. GRB 060115: Swift XRT refined analysis
  36. GRB 060114: Swift/UVOT Observations
  37. GRB060115, optical observation
  38. GRB 060115: MITSuME optical afterglow candidate
  39. GRB 060115: Swift detection of a burst
  40. GRB060114, optical observation
  41. GRB060114: Faulkes North observation
  42. GRB 060108: IR observations of afterglow
  43. GRB 060108: Evidence for an XRT Position Offset
  44. GRB 060110: KAIT observations
  45. GRB 060111B: Swift XRT refined analysis
  46. GRB 060111B: MITSuME detection of optical afterglow
  47. GRB 060111B: TAROT optical observation
  48. GRB060111A: RTT150 optical observations
  49. GRB060111B: RTT150, possible host galaxy
  50. GRB 060111B: Refined analysis of the Swift-BAT burst
  51. GRB 060111(a): P60 Observations
  52. GRB 060111B: Gualba observatory limit
  53. GRB 060111B: Swift detection of a burst
  54. GRB 060111: Swift-BAT Refined Analysis
  55. GRB060111.2:_MASTER optical limit
  56. GRB 060108: VLT K-band observations
  57. GRB 060111: TAROT optical observation
  58. GRB 060111: Swift detection of a burst
  59. GRB 060110: Mitsume optical observations
  60. GRB 060110: Swift-BAT refined analysis
  61. GRB 060109: Swift-BAT refined analysis
  62. GRB 060108: z-band imaging from Gemini-North
  63. GRB 060110a: RAPTOR detection of early optical emission.
  64. GRB 060110: UKIRT K-band observations
  65. GRB 060110: IR Candidate Afterglow
  66. GRB060110, optical observation
  67. GRB 060110: Correction
  68. Correction to GRB 060109 XRT analysis
  69. GRB 050110: IR Observations
  70. GRB 060109: Refined Swift-XRT analysis
  71. GRB 060109: Swift/UVOT upper limits
  72. GRB060109, optical observation
  73. GRB 060108: ISAS early observations and near IR upper limit
  74. GRB060108: P200 Ks Observations
  75. GRB 060108: early UKIRT K-band observations
  76. GRB 060108: a dark burst?
  77. GRB 060108: Refined XRT analysis
  78. GRB 060108: VLT J-band observations
  79. GRB 060108: Mitsume optical observations
  80. GRB 060108: Swift/UVOT upper limits
  81. GRB 060105: quick look analysis of the Suzaku/XIS afterglow observation
  82. GRB060108: SDSS pre-burst observations
  83. GRB060108: Faulkes Telescope observation
  84. GRB060108, optical observation
  85. GRB 060108: Refined analysis of the Swift-BAT burst
  86. GRB060108: Swift detection of its 100th GRB
  87. GRB 060105: ISAS observations and near IR upper limit
  88. GRB 060105: Swift/UVOT upper limits
  89. GRB 060105: Mitsume optical observations
  90. GRB 060105: BAT refined analysis
  91. GRB 060105: XRT refined analysis
  92. GRB060105: Suzaku-XIS and -HXD observation plan
  93. GRB060105, optical observation
  94. GRB060105: Swift detection of a bright long burst
  95. Swift-BAT trigger 175653 is probably not a GRB
  96. GRB 060102: Swift-BAT refined analysis
  97. GRB 060102: Swift-BAT detection of a burst
  98. GRB 051221B: Optical Observations with Kuiper 1.54m
  99. GRB 051227: Likely host galaxy underlying afterglow position
  100. GRB 051227: optical observation

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