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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"

28053 results found.

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

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