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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"

28049 results found.

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

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