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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"

28048 results found.

  1. GRB 060124: HETE detection and spectrum of the main peak
  2. GRB060124: detailed XRT analysis
  3. GRB 060124: ART optical limits during the burst
  4. GRB060123: Optical and IR Imaging
  5. GRB 060123: P200 Observations
  6. GRB 060124: XRT refined analysis
  7. GRB 060124: R band Observations
  8. GRB 060124 : Optical observation at Xinglong and Kiso
  9. GRB060124: optical observations at Asiago
  10. GRB060123: SDSS pre-burst observations
  11. GRB 060116: Further analysis of VLT photometry and optical spectroscopy
  12. GRB 060121: OHP optical limits
  13. GRB 060124: TAROT optical limits
  14. GRB060124, optical observation
  15. GRB 060124: Optical Observations at Tautenburg
  16. GRB 060117: Suzaku WAM observation of the prompt emission
  17. GRB 060111B: Suzaku WAM observation of the prompt emission
  18. GRB 060124: Swift-BAT detection of a burst
  19. GRB 060121: Liverpool Telescopes optical limits
  20. GRB 060121: Swift XRT refined analysis
  21. Konus-Wind observation of GRB 060121
  22. GRB 060121: candidate optical counterpart
  23. GRB 060121: Infrared Observations
  24. GRB 060121: optical observations
  25. GRB 060121: Optical imaging
  26. GRB060121 - SDSS pre-burst observations
  27. HETE Alert 4006: MASTER promt optical limit
  28. GRB060117 - ATCA 3/6cm radio limits - correction
  29. GRB060117 - ATCA 3/6cm radio limits
  30. GRB 060116: photometric redshift - the farthest GRB?
  31. Konus-Wind observation of GRB 060117
  32. GRB 060116: UKIRT IR Observations
  33. GRB 060117: Refined analysis of the Swift-BAT burst
  34. GRB 060117: FRAM optical afterglow candidate
  35. GRB 060117: nearby galaxy
  36. GRB 060116: VLT optical observations
  37. GRB 060116: Refined analysis of the Swift-BAT burst
  38. GRB 060116: XRT refined analysis
  39. GRB 060116: IR Candidate Afterglow
  40. GRB 060116: Swift/UVOT upper limits
  41. GRB060115: REM observations
  42. GRB 060110: XRT position and analysis
  43. GRB 060116 : Lulin optical limit
  44. GRB060116: Faulkes North observation
  45. GRB 060116: Swift-BAT detection of a burst
  46. GRB 060115: Refined analysis of the Swift-BAT burst
  47. GRB 060115: Swift/UVOT upper limits
  48. GRB 060114: REM observations
  49. GRB 060115: Swift XRT refined analysis
  50. GRB 060114: Swift/UVOT Observations
  51. GRB060115, optical observation
  52. GRB 060115: MITSuME optical afterglow candidate
  53. GRB 060115: Swift detection of a burst
  54. GRB060114, optical observation
  55. GRB060114: Faulkes North observation
  56. GRB 060108: IR observations of afterglow
  57. GRB 060108: Evidence for an XRT Position Offset
  58. GRB 060110: KAIT observations
  59. GRB 060111B: Swift XRT refined analysis
  60. GRB 060111B: MITSuME detection of optical afterglow
  61. GRB 060111B: TAROT optical observation
  62. GRB060111A: RTT150 optical observations
  63. GRB060111B: RTT150, possible host galaxy
  64. GRB 060111B: Refined analysis of the Swift-BAT burst
  65. GRB 060111(a): P60 Observations
  66. GRB 060111B: Gualba observatory limit
  67. GRB 060111B: Swift detection of a burst
  68. GRB 060111: Swift-BAT Refined Analysis
  69. GRB060111.2:_MASTER optical limit
  70. GRB 060108: VLT K-band observations
  71. GRB 060111: TAROT optical observation
  72. GRB 060111: Swift detection of a burst
  73. GRB 060110: Mitsume optical observations
  74. GRB 060110: Swift-BAT refined analysis
  75. GRB 060109: Swift-BAT refined analysis
  76. GRB 060108: z-band imaging from Gemini-North
  77. GRB 060110a: RAPTOR detection of early optical emission.
  78. GRB 060110: UKIRT K-band observations
  79. GRB 060110: IR Candidate Afterglow
  80. GRB060110, optical observation
  81. GRB 060110: Correction
  82. Correction to GRB 060109 XRT analysis
  83. GRB 050110: IR Observations
  84. GRB 060109: Refined Swift-XRT analysis
  85. GRB 060109: Swift/UVOT upper limits
  86. GRB060109, optical observation
  87. GRB 060108: ISAS early observations and near IR upper limit
  88. GRB060108: P200 Ks Observations
  89. GRB 060108: early UKIRT K-band observations
  90. GRB 060108: a dark burst?
  91. GRB 060108: Refined XRT analysis
  92. GRB 060108: VLT J-band observations
  93. GRB 060108: Mitsume optical observations
  94. GRB 060108: Swift/UVOT upper limits
  95. GRB 060105: quick look analysis of the Suzaku/XIS afterglow observation
  96. GRB060108: SDSS pre-burst observations
  97. GRB060108: Faulkes Telescope observation
  98. GRB060108, optical observation
  99. GRB 060108: Refined analysis of the Swift-BAT burst
  100. GRB060108: Swift detection of its 100th GRB

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