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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').
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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"

28057 results found.

  1. GRB060130: REM infrared observations
  2. GRB 060130, SMARTS optical observations
  3. GRB 060130: FRAM optical observations
  4. GRB 060130: further INTEGRAL IBIS results
  5. GRB 060121: Confirmation of NIR Afterglow
  6. GRB 060123: Swift refined analysis of an unusual GRB
  7. GRB060124, BVRcIc field calibration
  8. GRB 060121: Probable Detection of NIR Afterglow
  9. GRB 060116 HST observations
  10. GRB 060124: HETE detection and spectrum of the main peak
  11. GRB060124: detailed XRT analysis
  12. GRB 060124: ART optical limits during the burst
  13. GRB060123: Optical and IR Imaging
  14. GRB 060123: P200 Observations
  15. GRB 060124: XRT refined analysis
  16. GRB 060124: R band Observations
  17. GRB 060124 : Optical observation at Xinglong and Kiso
  18. GRB060124: optical observations at Asiago
  19. GRB060123: SDSS pre-burst observations
  20. GRB 060116: Further analysis of VLT photometry and optical spectroscopy
  21. GRB 060121: OHP optical limits
  22. GRB 060124: TAROT optical limits
  23. GRB060124, optical observation
  24. GRB 060124: Optical Observations at Tautenburg
  25. GRB 060117: Suzaku WAM observation of the prompt emission
  26. GRB 060111B: Suzaku WAM observation of the prompt emission
  27. GRB 060124: Swift-BAT detection of a burst
  28. GRB 060121: Liverpool Telescopes optical limits
  29. GRB 060121: Swift XRT refined analysis
  30. Konus-Wind observation of GRB 060121
  31. GRB 060121: candidate optical counterpart
  32. GRB 060121: Infrared Observations
  33. GRB 060121: optical observations
  34. GRB 060121: Optical imaging
  35. GRB060121 - SDSS pre-burst observations
  36. HETE Alert 4006: MASTER promt optical limit
  37. GRB060117 - ATCA 3/6cm radio limits - correction
  38. GRB060117 - ATCA 3/6cm radio limits
  39. GRB 060116: photometric redshift - the farthest GRB?
  40. Konus-Wind observation of GRB 060117
  41. GRB 060116: UKIRT IR Observations
  42. GRB 060117: Refined analysis of the Swift-BAT burst
  43. GRB 060117: FRAM optical afterglow candidate
  44. GRB 060117: nearby galaxy
  45. GRB 060116: VLT optical observations
  46. GRB 060116: Refined analysis of the Swift-BAT burst
  47. GRB 060116: XRT refined analysis
  48. GRB 060116: IR Candidate Afterglow
  49. GRB 060116: Swift/UVOT upper limits
  50. GRB060115: REM observations
  51. GRB 060110: XRT position and analysis
  52. GRB 060116 : Lulin optical limit
  53. GRB060116: Faulkes North observation
  54. GRB 060116: Swift-BAT detection of a burst
  55. GRB 060115: Refined analysis of the Swift-BAT burst
  56. GRB 060115: Swift/UVOT upper limits
  57. GRB 060114: REM observations
  58. GRB 060115: Swift XRT refined analysis
  59. GRB 060114: Swift/UVOT Observations
  60. GRB060115, optical observation
  61. GRB 060115: MITSuME optical afterglow candidate
  62. GRB 060115: Swift detection of a burst
  63. GRB060114, optical observation
  64. GRB060114: Faulkes North observation
  65. GRB 060108: IR observations of afterglow
  66. GRB 060108: Evidence for an XRT Position Offset
  67. GRB 060110: KAIT observations
  68. GRB 060111B: Swift XRT refined analysis
  69. GRB 060111B: MITSuME detection of optical afterglow
  70. GRB 060111B: TAROT optical observation
  71. GRB060111A: RTT150 optical observations
  72. GRB060111B: RTT150, possible host galaxy
  73. GRB 060111B: Refined analysis of the Swift-BAT burst
  74. GRB 060111(a): P60 Observations
  75. GRB 060111B: Gualba observatory limit
  76. GRB 060111B: Swift detection of a burst
  77. GRB 060111: Swift-BAT Refined Analysis
  78. GRB060111.2:_MASTER optical limit
  79. GRB 060108: VLT K-band observations
  80. GRB 060111: TAROT optical observation
  81. GRB 060111: Swift detection of a burst
  82. GRB 060110: Mitsume optical observations
  83. GRB 060110: Swift-BAT refined analysis
  84. GRB 060109: Swift-BAT refined analysis
  85. GRB 060108: z-band imaging from Gemini-North
  86. GRB 060110a: RAPTOR detection of early optical emission.
  87. GRB 060110: UKIRT K-band observations
  88. GRB 060110: IR Candidate Afterglow
  89. GRB060110, optical observation
  90. GRB 060110: Correction
  91. Correction to GRB 060109 XRT analysis
  92. GRB 050110: IR Observations
  93. GRB 060109: Refined Swift-XRT analysis
  94. GRB 060109: Swift/UVOT upper limits
  95. GRB060109, optical observation
  96. GRB 060108: ISAS early observations and near IR upper limit
  97. GRB060108: P200 Ks Observations
  98. GRB 060108: early UKIRT K-band observations
  99. GRB 060108: a dark burst?
  100. GRB 060108: Refined XRT analysis

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