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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').

10636 results found.

  1. Swift XRT Observation of GRB 060204C
  2. GRB 060204B: Swift-BAT refined analysis
  3. GRB 060204C: ROTSE-III Optical Limits
  4. GRB 060204C: Swift-BAT detection of a burst
  5. GRB 060204B: ART optical limit
  6. GRB 060204A: further INTEGRAL results
  7. GRB 060203: Swift-BAT refined analysis
  8. GRB 060203: RTT150 optical observations
  9. Swift-BAT trigger is GRB 060203
  10. GRB 060203: IR Counterpart
  11. GRB 060202: PROMPT Observations
  12. GRB 060202: Near-IR Observation with UKIRT/WFCAM
  13. GRB 060202: Refined analysis of the Swift-BAT burst
  14. GRB 060202: Swift detection of a burst
  15. GRB 060130: PROMPT Observations
  16. GRB 060130: further INTEGRAL IBIS results
  17. GRB 060121: Confirmation of NIR Afterglow
  18. GRB 060123: Swift refined analysis of an unusual GRB
  19. GRB060105: refined analysis of the Suzaku observation
  20. GRB060124 optical observations
  21. GRB 060121: Probable Detection of NIR Afterglow
  22. Konus-Wind observation of GRB 060124
  23. GRB060124: detailed XRT analysis
  24. GRB 060124: Confirmation of the Afterglow
  25. GRB 060124: Optical Observations at Tautenburg
  26. GRB 060117: Suzaku WAM observation of the prompt emission
  27. GRB 060111B: Suzaku WAM observation of the prompt emission
  28. Konus-Wind observation of GRB 060121
  29. GRB060117 - ATCA 3/6cm radio limits - correction
  30. GRB060117 - ATCA 3/6cm radio limits
  31. Konus-Wind observation of GRB 060117
  32. GRB 060116: PROMPT Observations
  33. GRB 060117: FRAM refined analysis
  34. GRB 060116: Refined analysis of the Swift-BAT burst
  35. GRB 060116: ROTSE-III Optical Limits
  36. GRB 060115: Refined analysis of the Swift-BAT burst
  37. GRB 060115: MITSuME optical afterglow candidate
  38. GRB 060115: Swift detection of a burst
  39. GRB 060114: A long GRB detected by INTEGRAL
  40. GRB 060111B: MITSuME detection of optical afterglow
  41. GRB 060110: MARGE observations
  42. GRB 060111B: ROTSE-III Detection of Optical Counterpart Flare
  43. GRB 060111B: Swift detection of a burst
  44. GRB 060111: TAROT optical observation
  45. GRB 060111: Swift detection of a burst
  46. GRB 060109: Swift-BAT refined analysis
  47. GRB060109, optical observation
  48. GRB060108: Swift detection of its 100th GRB
  49. Konus-Wind observation of GRB 060105
  50. GRB 060105: Mitsume optical observations
  51. GRB 060105: XRT refined analysis
  52. GRB 060102: Swift-BAT detection of a burst
  53. GRB051227: SARA Observations
  54. GRB 051227: Gemini observations
  55. GRB 051227: Magellan r'-band Imaging/Astrometry
  56. GRB 051227: refined analysis of VLT images
  57. GRB 051227: R-band object in the XRT error circle
  58. Konus-Wind observation of GRB 051221A
  59. GRB051221A: Suzaku WAM observation of the prompt emission
  60. GRB 051221A: Chandra Afterglow Position
  61. GRB 051221B: ROTSE-III Optical Limits
  62. GRB 051221A: RAPTOR Fading Counterpart Constraint
  63. GRB 051221B: BOOTES optical observations.
  64. Swift-BAT detection of a possible burst
  65. GRB 051211B: Swift XRT confirmation of the afterglow
  66. GRB 051211b: RTT150 optical observations
  67. GRB051211b: P60 Observations
  68. GRB 051211B: a long GRB detected by INTEGRAL
  69. IPN observations of SGR1806-20
  70. An extraordinary long burst on December 3 from SGR1806-20
  71. Possible resuming of the SGR 1806-20 activity
  72. GRB 051127: Swift-BAT detection of a possible burst
  73. GRB051117B: Swift XRT refined analysis
  74. GRB051111: Suzaku WAM observation of the prompt emission
  75. GRB051111: Rc optical observations
  76. GRB051008: Suzaku WAM observation of the prompt emission
  77. GRB 051021 Optical Observations
  78. GRB 051117B: ROTSE-III Optical Limits
  79. GRB 051117: Swift detection of a bright burst
  80. GRB050925: analysis of the XMM-Newton observation
  81. GRB 051111: Further spectroscopic analysis
  82. GRB/SGR 050925: XMM-Newton ToO observation
  83. GRB051111: Swift/UVOT Observations
  84. GRB 051111A: KAIT optical observations
  85. GRB051111: Swift-BAT detection of a bright burst
  86. GRB 051109b: GETS observation
  87. Early RAPTOR measurements of GRB 051109a - the movie.
  88. Konus-Wind observation of GRB 051109A
  89. GRB 051109B: ROTSE-III Optical Limits
  90. IPN triangulation and Konus spectrum of the short/soft GRB051107 (large
  91. GRB051105B: REM Optical observation
  92. GRB 051109B: Swift detection of a burst
  93. GRB 051109: Swift-BAT refined analysis
  94. GRB051109: Swift detection of a burst
  95. GRB051103: MASTER: OT limit and host galaxy candidates
  96. GRB 051105a: MDM Observations
  97. GRB 051105A: TNG optical observations
  98. IPN triangulation and Konus spectrum of the bright short/hard GRB051103
  99. GRB051105B - A long GRB detected by INTEGRAL
  100. Konus-Wind observation of GRB 051028

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