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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"

19598 results found.

  1. GRB 130919A, Swift-BAT refined analysis
  2. GRB 130913A detected in ground analysis of Swift-BAT data
  3. GRB 130919A: Swift detection of a burst
  4. GRB 130903A: Further Swift XRT observations.
  5. GRB 130606A: Chandra observation
  6. GRB 130912A: Swift/UVOT Upper Limits
  7. GRB 130912A: RATIR Optical and NIR Upper Limits
  8. Konus-Wind observation of GRB 130912A
  9. GRB 130912A: P60 Observations
  10. GRB 130912A: Swift-XRT refined Analysis
  11. GRB 130907A: MASTER refined analysis
  12. GRB 130912A: Fermi GBM detection
  13. GRB 130912A: Skynet DSO-14/Yerkes-41/PROMPT-CTIO observations
  14. GRB 130912A: Enhanced Swift-XRT position
  15. GRB 130912A, Swift-BAT refined analysis
  16. GRB 130912A: GROND observations
  17. GRB 130912A: Swift detection of a short burst
  18. GRB 120419A: Swift XRT confirmation of the afterglow
  19. GRB 130828A: Further Swift XRT observations
  20. GRB 130907A: Further Swift-BAT refined analysis
  21. GRB 130907A: INTEGRAL/SPI-ACS light curve
  22. Konus-Wind observation of GRB 130907A
  23. GRB 130907A, Swift-BAT refined analysis
  24. GRB 130907A: Swift-XRT refined Analysis
  25. GRB 130907A: Enhanced Swift-XRT position
  26. GRB 120916A: Fermi-LAT detection of a burst
  27. GRB 130907A: Swift/UVOT Detection
  28. GRB 130907A: Early Tautenburg detections, red afterglow
  29. GRB 130907A: Skynet DSO-14/Yerkes-41/GORT confirmation of a fading afterglow
  30. GRB 130907A: RATIR Optical and NIR Afterglow Confirmation
  31. GRB 130907A: Skynet DSO-14/Yerkes-41 detections of a possible afterglow
  32. GRB 130831A: Maidanak optical observations
  33. GRB 130831A: optical observation in Chuguev AO
  34. GRB 130831A: ISON-Kislovodsk optical observations
  35. GRB 130831A: optical observation in Gissar AO
  36. GRB 130831A: ISON-UAFO optical observations
  37. GRB 130907A: MASTER early OT observations
  38. GRB 130907A: Swift detection of a burst with an optical counterpart
  39. Swift follow-up results of the possible weak INTEGRAL GRB
  40. GRB 130903A: Swift/UVOT Upper Limits
  41. Swift follow-up of an INTEGRAL possible weak GRB
  42. GRB 130831A: RATIR Optical and NIR Upper Limits
  43. GRB 130903A: Fermi GBM observation
  44. GRB 130903A: Swift-XRT observations
  45. Swift trigger 569022 is a new Galactic source Swift J1734.5-3027
  46. GRB 130831A: Swift/UVOT Observations
  47. GRB 130831A: Montarrenti Observatory optical follow-up
  48. GRB 130831A: RATIR Optical and NIR Observations
  49. GRB 130831A: Continued Skynet/PROMPT-SSO, PROMPT-CTIO and Yerkes-41 detections
  50. GRB 130831B, Swift-BAT refined analysis
  51. GRB 130831A: VLA Observations
  52. GRB 130831A: T100 observations
  53. GRB 130831B: Swift/UVOT Upper Limits
  54. GRB 130831B: GROND upper limits
  55. Swift Trigger 569022: a possible GRB
  56. GRB 130831A: THO optical observation
  57. GRB 130831A, Swift-BAT refined analysis
  58. GRB 130831B: Swift-XRT refined Analysis
  59. GRB 130831A: Swift-XRT refined Analysis
  60. GRB 130831A: Montarrenti Observatory optical observations
  61. GRB 130831B: Enhanced Swift-XRT position
  62. GRB 130831A: Skynet/PROMPT-SSO detections
  63. GRB 130831A: Enhanced Swift-XRT position
  64. Konus-Wind observation of GRB 130831A
  65. GRB 130831B: Swift detection of a burst
  66. GRB 130831A: Faulkes Telescope North and South optical afterglow
  67. GRB 130831A: Swift detection of a burst with an optical counterpart
  68. IPN triangulation of GRB 130828A - error box
  69. GRB 130822A: optical upper limits
  70. GRB 130829A: AAO optical observations
  71. GRB 130828A: Swift XRT and UVOT observations
  72. IPN triangulation of GRB 130828A
  73. GRB 130829A: Swift detection of a burst
  74. GRB 130828A Tiled Swift observations
  75. IPN triangulation of GRB130821A
  76. GRB 130822A Swift-BAT Spectral lag analysis
  77. GRB 130821A: Swift-XRT observation
  78. GRB 130822A: Gemini Observations
  79. GRB 130822A: Swift-XRT refined Analysis
  80. GRB 130822A: Swift/UVOT Upper Limits
  81. GRB 130822A: Enhanced Swift-XRT position
  82. GRB 130822A, Swift-BAT refined analysis
  83. GRB 130821A: Fermi-LAT detection of a burst
  84. GRB 130822A: Swift detection of a short burst
  85. GRB 130816A: Swift/UVOT Upper Limits
  86. GRB 130816B: Swift/UVOT Upper Limits
  87. GRB 130816B, Swift-BAT refined analysis
  88. GRB 130816B: GROND afterglow candidate
  89. GRB 130816A: Swift-XRT refined Analysis
  90. GRB 130816A, Swift-BAT refined analysis
  91. GRB 130816A: Fermi GBM observation
  92. GRB 130816B: Swift-XRT refined Analysis
  93. GRB 130816B: Enhanced Swift-XRT position
  94. GRB 130816A: GROND confirmation of afterglow
  95. GRB 130816A: Enhanced Swift-XRT position
  96. GRB 130816B: Swift detection of a burst
  97. GRB 130816A: Swift detection of a burst
  98. Refined IPN Triangulation of GRB 130812B
  99. IPN Triangulation of GRB 130812B (long/soft)
  100. GRB 130812A: Swift/UVOT Upper Limits

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