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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"

11503 results found.

  1. GRB 120119A: optical observations
  2. GRB 120118B: RTT150 optical observations
  3. GRB 120119A: Swift-XRT refined Analysis
  4. Konus-Wind observation of GRB 120119A
  5. GRB 120118B: Swift-XRT refined Analysis
  6. XRF 120118A: early optical limit by "Pi of the Sky"
  7. XRF 120118A: an X-Ray Flash detected by INTEGRAL
  8. GRB 120116A: Swift-XRT refined Analysis
  9. GRB 120116A: Mondy optical observations
  10. GRB 120116A: Optical observations at Crni Vrh
  11. GRB 120116A: Swift detection of a burst
  12. GRB 120114A found in ground analysis of BAT data
  13. GRB 120106A: optical upper limit
  14. Konus-Wind observation of GRB 120107A
  15. GRB 120106A: MITSuME Okayama Ks-band upper limit
  16. GRB 120106A: Swift detection of a burst
  17. GRB 111225A, the review of the sky area in plate archives
  18. GRB 111222A, the review of the sky area in plate archives
  19. Konus-Wind observation of GRB 120102A
  20. GRB 120102A: Swift-BAT refined analysis
  21. Konus-Wind observation of GRB 111228A
  22. GRB 111228A: MASTER-Net optical photometry
  23. GRB 111229A: Swift/UVOT Detection
  24. GRB 111229A: Swift detection of a burst
  25. GRB 111228A: Swift-XRT refined Analysis
  26. GRB 111228A: Skynet/Dolomiti Optical Observations
  27. XMM-Newton observation of the short GRB 111020A
  28. GRB 111228A: Swift detection of a burst with an optical counterpart
  29. GRB 111225A: GRT Optical Observation
  30. GRB 111225A: Swift-XRT refined Analysis
  31. GRB 111225A: TAROT Calern observatory optical detection
  32. GRB 111222A: Swift-XRT observations
  33. Konus-Wind observation of GRB 111222A
  34. GRB 110820A: optical observations in Maidanak observatory
  35. GRB 111215B: Suzaku WAM observation of the prompt emission
  36. Konus-Wind observation of GRB 111215B
  37. GRB 111215B: Swift-XRT observations
  38. IPN Triangulation of GRB 111215B (long/intense)
  39. GRB 111215A: Swift-XRT refined Analysis
  40. GRB 111215A: Swift-BAT refined analysis
  41. GRB 111209A: RAPTOR Limits Before and During the Gamma-ray Emitting Interval
  42. GRB 111215A : Xinglong TNT upper limit
  43. Konus-Wind observation of GRB 111211A
  44. GRB 111212A: Swift-XRT refined Analysis
  45. GRB 111211A: Swift/XRT target of opportunity observation
  46. GRB 111212A: Swift-XRT observations
  47. GRB 111212A: Swift detection of a burst
  48. GRB 111211A: SuperAGILE localization of a long GRB
  49. Konus-Wind observation of GRB 111209A
  50. GRB 111210A: Swift-XRT refined Analysis
  51. GRB 111208A: Swift-XRT refined analysis
  52. GRB 111210A: Swift detection of a burst
  53. GRB 111209A optical limit by "Pi of the Sky"
  54. GRB 111209A: Swift-XRT refined Analysis
  55. GRB 111209A: Faulkes Telescope North observations
  56. GRB 111208A: Swift XRT/UVOT observations
  57. GRB 111208A found in ground analysis of BAT data
  58. Konus-Wind observation of GRB 111205A
  59. IPN Triangulation of GRB 111205A (long/hard/intense)
  60. GRB 111204A: TNG NIR observations
  61. GRB 111204A: Swift-XRT refined Analysis
  62. GRB 111022B: CrAO optical limit
  63. GRB 111123A: optical upper limit in CrAO: correction to the GCN circ. 12613
  64. GRB 111123A: optical upper limit in CrAO
  65. GRB 111204A: Swift detection of a burst
  66. GRB111201A: Swift-XRT observations
  67. GRB 111201A found in ground analysis of BAT data
  68. GRB 111129A: Swift/UVOT Detection
  69. GRB 111129A, GROND afterglow observations
  70. GRB 111129A: Swift-XRT refined Analysis
  71. GRB 111129A: Swift detection of a burst with an optical counterpart
  72. GRB 111123A: TNG NIR detection of the afterglow candidate
  73. GRB 111123A: Swift-XRT refined Analysis
  74. GRB 111123A: GMG optical observation
  75. GRB 111123A: Swift detection of a burst
  76. Konus-Wind observation of GRB 111121A
  77. GRB 111117A: Chandra detection of the afterglow
  78. GRB 111117A: Gemini Afterglow Limits
  79. GRB 111117A: Swift-XRT refined Analysis
  80. GRB 111117A: NOT observations
  81. GRB 111117A: Chandra ToO observation scheduled
  82. GRB 111117A: Swift detection of a short hard burst
  83. Konus-Wind observation of GRB 111113A
  84. XRF 111111A/MAXI J0158-744: MAXI GSC and SSC detection of a soft X-ray transient near SMC
  85. GRB 111109A: Swift-BAT refined analysis
  86. GRB 111109A: Swift detection of a burst
  87. GRB 111107A: Swift-XRT refined Analysis
  88. GRB 111107A: Swift detection of a burst with an optical counterpart
  89. Konus-Wind observation of GRB 111103B
  90. GRB 111103B: Swift-XRT refined Analysis
  91. GRB 111103B: optical observations from TAU, Ka-Dar
  92. GRB 111103A: Swift-BAT refined analysis
  93. GRB 111022B: MASTER OT observations
  94. GRB 111103B: Swift detection of a strong burst from a GRB or Galactic source
  95. GRB 111103A: Swift detection of a burst
  96. GRB 111029A: Super-LOTIS early limits
  97. GRB 111029A: KAIT optical limits
  98. GRB 111029A: ROTSE-III Optical Limits
  99. GRB 111029A: Swift detection of a burst
  100. GRB 111024A: MAXI/GSC detection of a burst

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