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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"

28037 results found.

  1. GRB 060121: OHP optical limits
  2. GRB 060124: TAROT optical limits
  3. GRB060124, optical observation
  4. GRB 060124: Optical Observations at Tautenburg
  5. GRB 060117: Suzaku WAM observation of the prompt emission
  6. GRB 060111B: Suzaku WAM observation of the prompt emission
  7. GRB 060124: Swift-BAT detection of a burst
  8. GRB 060121: Liverpool Telescopes optical limits
  9. GRB 060121: Swift XRT refined analysis
  10. Konus-Wind observation of GRB 060121
  11. GRB 060121: candidate optical counterpart
  12. GRB 060121: Infrared Observations
  13. GRB 060121: optical observations
  14. GRB 060121: Optical imaging
  15. GRB060121 - SDSS pre-burst observations
  16. HETE Alert 4006: MASTER promt optical limit
  17. GRB060117 - ATCA 3/6cm radio limits - correction
  18. GRB060117 - ATCA 3/6cm radio limits
  19. GRB 060116: photometric redshift - the farthest GRB?
  20. Konus-Wind observation of GRB 060117
  21. GRB 060116: UKIRT IR Observations
  22. GRB 060117: Refined analysis of the Swift-BAT burst
  23. GRB 060117: FRAM optical afterglow candidate
  24. GRB 060117: nearby galaxy
  25. GRB 060116: VLT optical observations
  26. GRB 060116: Refined analysis of the Swift-BAT burst
  27. GRB 060116: XRT refined analysis
  28. GRB 060116: IR Candidate Afterglow
  29. GRB 060116: Swift/UVOT upper limits
  30. GRB060115: REM observations
  31. GRB 060110: XRT position and analysis
  32. GRB 060116 : Lulin optical limit
  33. GRB060116: Faulkes North observation
  34. GRB 060116: Swift-BAT detection of a burst
  35. GRB 060115: Refined analysis of the Swift-BAT burst
  36. GRB 060115: Swift/UVOT upper limits
  37. GRB 060114: REM observations
  38. GRB 060115: Swift XRT refined analysis
  39. GRB 060114: Swift/UVOT Observations
  40. GRB060115, optical observation
  41. GRB 060115: MITSuME optical afterglow candidate
  42. GRB 060115: Swift detection of a burst
  43. GRB060114, optical observation
  44. GRB060114: Faulkes North observation
  45. GRB 060108: IR observations of afterglow
  46. GRB 060108: Evidence for an XRT Position Offset
  47. GRB 060110: KAIT observations
  48. GRB 060111B: Swift XRT refined analysis
  49. GRB 060111B: MITSuME detection of optical afterglow
  50. GRB 060111B: TAROT optical observation
  51. GRB060111A: RTT150 optical observations
  52. GRB060111B: RTT150, possible host galaxy
  53. GRB 060111B: Refined analysis of the Swift-BAT burst
  54. GRB 060111(a): P60 Observations
  55. GRB 060111B: Gualba observatory limit
  56. GRB 060111B: Swift detection of a burst
  57. GRB 060111: Swift-BAT Refined Analysis
  58. GRB060111.2:_MASTER optical limit
  59. GRB 060108: VLT K-band observations
  60. GRB 060111: TAROT optical observation
  61. GRB 060111: Swift detection of a burst
  62. GRB 060110: Mitsume optical observations
  63. GRB 060110: Swift-BAT refined analysis
  64. GRB 060109: Swift-BAT refined analysis
  65. GRB 060108: z-band imaging from Gemini-North
  66. GRB 060110a: RAPTOR detection of early optical emission.
  67. GRB 060110: UKIRT K-band observations
  68. GRB 060110: IR Candidate Afterglow
  69. GRB060110, optical observation
  70. GRB 060110: Correction
  71. Correction to GRB 060109 XRT analysis
  72. GRB 050110: IR Observations
  73. GRB 060109: Refined Swift-XRT analysis
  74. GRB 060109: Swift/UVOT upper limits
  75. GRB060109, optical observation
  76. GRB 060108: ISAS early observations and near IR upper limit
  77. GRB060108: P200 Ks Observations
  78. GRB 060108: early UKIRT K-band observations
  79. GRB 060108: a dark burst?
  80. GRB 060108: Refined XRT analysis
  81. GRB 060108: VLT J-band observations
  82. GRB 060108: Mitsume optical observations
  83. GRB 060108: Swift/UVOT upper limits
  84. GRB 060105: quick look analysis of the Suzaku/XIS afterglow observation
  85. GRB060108: SDSS pre-burst observations
  86. GRB060108: Faulkes Telescope observation
  87. GRB060108, optical observation
  88. GRB 060108: Refined analysis of the Swift-BAT burst
  89. GRB060108: Swift detection of its 100th GRB
  90. GRB 060105: ISAS observations and near IR upper limit
  91. GRB 060105: Swift/UVOT upper limits
  92. GRB 060105: Mitsume optical observations
  93. GRB 060105: BAT refined analysis
  94. GRB 060105: XRT refined analysis
  95. GRB060105: Suzaku-XIS and -HXD observation plan
  96. GRB060105, optical observation
  97. GRB060105: Swift detection of a bright long burst
  98. Swift-BAT trigger 175653 is probably not a GRB
  99. GRB 060102: Swift-BAT refined analysis
  100. GRB 060102: Swift-BAT detection of a burst

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