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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').

17864 results found.

  1. GRB 060719: Swift detection of a burst
  2. GRB 060717: Swift XRT refined analysis
  3. GRB 060714: Refined analysis of the Swift-BAT burst
  4. GRB060717: Swift/UVOT upper limits
  5. GRB 060717: Swift XRT refined position
  6. GRB 060717: Swift-BAT refined analysis
  7. GRB 060717: Swift detection of a burst
  8. GRB 060714: Swift XRT refined analysis
  9. GRB060708: MARGE low resolution spectrum observations
  10. Swift-BAT trigger 219136 is not a GRB
  11. GRB060707 possible optical confirmation
  12. Swift trigger 219136 is probably not a GRB
  13. GRB 060714: Swift detection of a burst with an UVOT optical afterglow
  14. GRB 060712: XRT refined analysis
  15. GRB 060712: Swift/UVOT Upper Limits
  16. GRB 060712: XRT refined position
  17. GRB 060712: Refined analysis of the Swift-BAT burst
  18. GRB 060712: Swift detection of a burst
  19. GRB 060708: Swift-XRT refined analysis
  20. GCN 060708: Swift-UVOT Observations
  21. GRB 060708: Refined analysis of the Swift-BAT burst
  22. GCN 060707: Swift-UVOT observations
  23. GRB 060707: Swift-XRT refined analysis
  24. GRB 060708: Swift detection of a burst with an UVOT countpart
  25. GRB060707 possible optical confirmation
  26. GRB 060707: BOOTES-IR optical afterglow candidate
  27. GRB 060707: Refined analysis of the Swift-BAT burst
  28. GRB 060707: BOOTES-IR optical observation
  29. GRB060614: Possible SN Bump in UVOT U Band Light Curve
  30. GRB 060707: Swift detection of a burst
  31. GRB 060614: Detection of a Possible, Late-Time Rebrightening
  32. Swift-BAT trigger 215279 is not a GRB
  33. Trigger 215279: Swift detection of a possible burst (GRB 060619)
  34. GRB 060614: pseudo-z from spectral parameters of the prompt emission
  35. Konus-Wind observation of GRB 060614
  36. The Unusually Long-Lived Afterglow of GRB 060614
  37. GRB 060605, optical observations
  38. GRB060614: SSO 1m observations
  39. GRB060614: Watcher observation
  40. GRB 060614: Swift-BAT refined analysis
  41. GRB 060614: Swift/UVOT Observations
  42. GRB060614: Swift-XRT refined analysis
  43. GRB 060604, optical observations
  44. GRB 060614: Swift detection of a burst with a bright optical and X-ray counterpart
  45. GRB 060602A: Swift/XRT analysis
  46. BAT Trigger #214277 is SGR 1900+14
  47. GRB 060610: KAIT observations
  48. GRB 060607: RTT150 optical observations
  49. GRB 070706B: Watcher upper limit
  50. GRB 060607B: Swift-BAT Refined Analysis
  51. GRB060602A: Swift/UVOT upper limits
  52. GRB 060607B: Swift detection of a burst
  53. GCN 060607: Swift-UVOT obswervations.
  54. GRB 060607: Swift-BAT Refined Analysis
  55. GRB 060607: optical limit by "Pi of the Sky"
  56. GRB 060607: Swift-XRT Team refined analysis
  57. VLT/UVES observations of GRB 060607
  58. GRB 060605: RTT150 optical observations
  59. GRB 060607: Swift detection of a burst with bright optical counterpart
  60. GRB 060605 BAT refined analysis
  61. GRB060605: Swift/UVOT detections
  62. GRB 060605: Swift-XRT Team refined analysis
  63. GRB 060605: RTT150 optical observations
  64. GRB 060605: ROTSE-III Optical Counterpart
  65. GRB 060605: Swift detection of a burst with optical counterpart
  66. GRB 060605: ROTSE-III Detection of Optical Counterpart
  67. GRB060604: Swift/UVOT detections
  68. GRB 060604: redshift
  69. GRB 060604 optical photometry
  70. GRB 060604: Swift-XRT Team refined analysis
  71. GRB 060604: BAT refined analysis
  72. GRB 060604A: ROTSE-III Optical Limits
  73. GRB 060604: Swift detection of a burst with possible optical counterpart
  74. GRB 060602A: Swift-BAT Refined Analysis: Correction
  75. GRB 060602B: XMM-Newton Survey Source
  76. GRB 060602B: Swift-XRT Refined Analysis
  77. GRB 060602B: Swift-BAT Refined Analysis
  78. GRB 060602B: Swift/UVOT observations
  79. GRB 060602A: Swift-BAT Refined Analysis
  80. GRB 060602B: RTT150 optical observations
  81. GRB 060602B: Swift detection of a burst
  82. GRB060602 - SDSS Pre-Burst Observations
  83. GRB 060602: Swift detection of a burst
  84. GRB 060526: Break in X-ray light curve
  85. GRB 051227 : WIDGET simultaneous optical observations
  86. GRB 060526: Multiple Optical Flares
  87. GRB060502b: optical observations
  88. GRB 060526: Optical Flare
  89. GRB 060526: Refined analysis of the Swift-BAT burst
  90. GRB 060526: RTT150 optical observations
  91. GRB060526: Further Swift-UVOT Observations
  92. GRB 060526: Swift/XRT Team refined analysis
  93. GRB 060526: ROTSE-III Observations of Optical Counterpart
  94. GRB 060526: Watcher Observations
  95. GRB 060526: Continued emission for the Swift burst
  96. GRB 060526: Swift detection of a burst with x-ray and optical afterglow
  97. GRB 060413 : WIDGET simultaneous optical observations
  98. GRB 060522: Swift/UVOT Observations: Correction
  99. GRB 060522: Swift/UVOT Observations of the Optical Afterglow
  100. XMM-Newton observation of GRB060510b

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