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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"

28047 results found.

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

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