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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"

28055 results found.

  1. GRB 060130: FRAM optical observations
  2. GRB 060130: further INTEGRAL IBIS results
  3. GRB 060121: Confirmation of NIR Afterglow
  4. GRB 060123: Swift refined analysis of an unusual GRB
  5. GRB060124, BVRcIc field calibration
  6. GRB 060121: Probable Detection of NIR Afterglow
  7. GRB 060116 HST observations
  8. GRB 060124: HETE detection and spectrum of the main peak
  9. GRB060124: detailed XRT analysis
  10. GRB 060124: ART optical limits during the burst
  11. GRB060123: Optical and IR Imaging
  12. GRB 060123: P200 Observations
  13. GRB 060124: XRT refined analysis
  14. GRB 060124: R band Observations
  15. GRB 060124 : Optical observation at Xinglong and Kiso
  16. GRB060124: optical observations at Asiago
  17. GRB060123: SDSS pre-burst observations
  18. GRB 060116: Further analysis of VLT photometry and optical spectroscopy
  19. GRB 060121: OHP optical limits
  20. GRB 060124: TAROT optical limits
  21. GRB060124, optical observation
  22. GRB 060124: Optical Observations at Tautenburg
  23. GRB 060117: Suzaku WAM observation of the prompt emission
  24. GRB 060111B: Suzaku WAM observation of the prompt emission
  25. GRB 060124: Swift-BAT detection of a burst
  26. GRB 060121: Liverpool Telescopes optical limits
  27. GRB 060121: Swift XRT refined analysis
  28. Konus-Wind observation of GRB 060121
  29. GRB 060121: candidate optical counterpart
  30. GRB 060121: Infrared Observations
  31. GRB 060121: optical observations
  32. GRB 060121: Optical imaging
  33. GRB060121 - SDSS pre-burst observations
  34. HETE Alert 4006: MASTER promt optical limit
  35. GRB060117 - ATCA 3/6cm radio limits - correction
  36. GRB060117 - ATCA 3/6cm radio limits
  37. GRB 060116: photometric redshift - the farthest GRB?
  38. Konus-Wind observation of GRB 060117
  39. GRB 060116: UKIRT IR Observations
  40. GRB 060117: Refined analysis of the Swift-BAT burst
  41. GRB 060117: FRAM optical afterglow candidate
  42. GRB 060117: nearby galaxy
  43. GRB 060116: VLT optical observations
  44. GRB 060116: Refined analysis of the Swift-BAT burst
  45. GRB 060116: XRT refined analysis
  46. GRB 060116: IR Candidate Afterglow
  47. GRB 060116: Swift/UVOT upper limits
  48. GRB060115: REM observations
  49. GRB 060110: XRT position and analysis
  50. GRB 060116 : Lulin optical limit
  51. GRB060116: Faulkes North observation
  52. GRB 060116: Swift-BAT detection of a burst
  53. GRB 060115: Refined analysis of the Swift-BAT burst
  54. GRB 060115: Swift/UVOT upper limits
  55. GRB 060114: REM observations
  56. GRB 060115: Swift XRT refined analysis
  57. GRB 060114: Swift/UVOT Observations
  58. GRB060115, optical observation
  59. GRB 060115: MITSuME optical afterglow candidate
  60. GRB 060115: Swift detection of a burst
  61. GRB060114, optical observation
  62. GRB060114: Faulkes North observation
  63. GRB 060108: IR observations of afterglow
  64. GRB 060108: Evidence for an XRT Position Offset
  65. GRB 060110: KAIT observations
  66. GRB 060111B: Swift XRT refined analysis
  67. GRB 060111B: MITSuME detection of optical afterglow
  68. GRB 060111B: TAROT optical observation
  69. GRB060111A: RTT150 optical observations
  70. GRB060111B: RTT150, possible host galaxy
  71. GRB 060111B: Refined analysis of the Swift-BAT burst
  72. GRB 060111(a): P60 Observations
  73. GRB 060111B: Gualba observatory limit
  74. GRB 060111B: Swift detection of a burst
  75. GRB 060111: Swift-BAT Refined Analysis
  76. GRB060111.2:_MASTER optical limit
  77. GRB 060108: VLT K-band observations
  78. GRB 060111: TAROT optical observation
  79. GRB 060111: Swift detection of a burst
  80. GRB 060110: Mitsume optical observations
  81. GRB 060110: Swift-BAT refined analysis
  82. GRB 060109: Swift-BAT refined analysis
  83. GRB 060108: z-band imaging from Gemini-North
  84. GRB 060110a: RAPTOR detection of early optical emission.
  85. GRB 060110: UKIRT K-band observations
  86. GRB 060110: IR Candidate Afterglow
  87. GRB060110, optical observation
  88. GRB 060110: Correction
  89. Correction to GRB 060109 XRT analysis
  90. GRB 050110: IR Observations
  91. GRB 060109: Refined Swift-XRT analysis
  92. GRB 060109: Swift/UVOT upper limits
  93. GRB060109, optical observation
  94. GRB 060108: ISAS early observations and near IR upper limit
  95. GRB060108: P200 Ks Observations
  96. GRB 060108: early UKIRT K-band observations
  97. GRB 060108: a dark burst?
  98. GRB 060108: Refined XRT analysis
  99. GRB 060108: VLT J-band observations
  100. GRB 060108: Mitsume optical observations

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