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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"

26341 results found.

  1. GRB 060124 : Optical observation at Xinglong and Kiso
  2. GRB060124: optical observations at Asiago
  3. GRB060123: SDSS pre-burst observations
  4. GRB 060116: Further analysis of VLT photometry and optical spectroscopy
  5. GRB 060121: OHP optical limits
  6. GRB 060124: TAROT optical limits
  7. GRB060124, optical observation
  8. GRB 060124: Optical Observations at Tautenburg
  9. GRB 060117: Suzaku WAM observation of the prompt emission
  10. GRB 060111B: Suzaku WAM observation of the prompt emission
  11. GRB 060124: Swift-BAT detection of a burst
  12. GRB 060121: Liverpool Telescopes optical limits
  13. GRB 060121: Swift XRT refined analysis
  14. Konus-Wind observation of GRB 060121
  15. GRB 060121: candidate optical counterpart
  16. GRB 060121: Infrared Observations
  17. GRB 060121: optical observations
  18. GRB 060121: Optical imaging
  19. GRB060121 - SDSS pre-burst observations
  20. HETE Alert 4006: MASTER promt optical limit
  21. GRB060117 - ATCA 3/6cm radio limits - correction
  22. GRB060117 - ATCA 3/6cm radio limits
  23. GRB 060116: photometric redshift - the farthest GRB?
  24. Konus-Wind observation of GRB 060117
  25. GRB 060116: UKIRT IR Observations
  26. GRB 060117: Refined analysis of the Swift-BAT burst
  27. GRB 060117: FRAM optical afterglow candidate
  28. GRB 060117: nearby galaxy
  29. GRB 060116: VLT optical observations
  30. GRB 060116: Refined analysis of the Swift-BAT burst
  31. GRB 060116: XRT refined analysis
  32. GRB 060116: IR Candidate Afterglow
  33. GRB 060116: Swift/UVOT upper limits
  34. GRB060115: REM observations
  35. GRB 060110: XRT position and analysis
  36. GRB 060116 : Lulin optical limit
  37. GRB060116: Faulkes North observation
  38. GRB 060116: Swift-BAT detection of a burst
  39. GRB 060115: Refined analysis of the Swift-BAT burst
  40. GRB 060115: Swift/UVOT upper limits
  41. GRB 060114: REM observations
  42. GRB 060115: Swift XRT refined analysis
  43. GRB 060114: Swift/UVOT Observations
  44. GRB060115, optical observation
  45. GRB 060115: MITSuME optical afterglow candidate
  46. GRB 060115: Swift detection of a burst
  47. GRB060114, optical observation
  48. GRB060114: Faulkes North observation
  49. GRB 060108: IR observations of afterglow
  50. GRB 060108: Evidence for an XRT Position Offset
  51. GRB 060110: KAIT observations
  52. GRB 060111B: Swift XRT refined analysis
  53. GRB 060111B: MITSuME detection of optical afterglow
  54. GRB 060111B: TAROT optical observation
  55. GRB060111A: RTT150 optical observations
  56. GRB060111B: RTT150, possible host galaxy
  57. GRB 060111B: Refined analysis of the Swift-BAT burst
  58. GRB 060111(a): P60 Observations
  59. GRB 060111B: Gualba observatory limit
  60. GRB 060111B: Swift detection of a burst
  61. GRB 060111: Swift-BAT Refined Analysis
  62. GRB060111.2:_MASTER optical limit
  63. GRB 060108: VLT K-band observations
  64. GRB 060111: TAROT optical observation
  65. GRB 060111: Swift detection of a burst
  66. GRB 060110: Mitsume optical observations
  67. GRB 060110: Swift-BAT refined analysis
  68. GRB 060109: Swift-BAT refined analysis
  69. GRB 060108: z-band imaging from Gemini-North
  70. GRB 060110a: RAPTOR detection of early optical emission.
  71. GRB 060110: UKIRT K-band observations
  72. GRB 060110: IR Candidate Afterglow
  73. GRB060110, optical observation
  74. GRB 060110: Correction
  75. Correction to GRB 060109 XRT analysis
  76. GRB 050110: IR Observations
  77. GRB 060109: Refined Swift-XRT analysis
  78. GRB 060109: Swift/UVOT upper limits
  79. GRB060109, optical observation
  80. GRB 060108: ISAS early observations and near IR upper limit
  81. GRB060108: P200 Ks Observations
  82. GRB 060108: early UKIRT K-band observations
  83. GRB 060108: a dark burst?
  84. GRB 060108: Refined XRT analysis
  85. GRB 060108: VLT J-band observations
  86. GRB 060108: Mitsume optical observations
  87. GRB 060108: Swift/UVOT upper limits
  88. GRB 060105: quick look analysis of the Suzaku/XIS afterglow observation
  89. GRB060108: SDSS pre-burst observations
  90. GRB060108: Faulkes Telescope observation
  91. GRB060108, optical observation
  92. GRB 060108: Refined analysis of the Swift-BAT burst
  93. GRB060108: Swift detection of its 100th GRB
  94. GRB 060105: ISAS observations and near IR upper limit
  95. GRB 060105: Swift/UVOT upper limits
  96. GRB 060105: Mitsume optical observations
  97. GRB 060105: BAT refined analysis
  98. GRB 060105: XRT refined analysis
  99. GRB060105: Suzaku-XIS and -HXD observation plan
  100. GRB060105, optical observation

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