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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"

27393 results found.

  1. GRB 130919A: Swift detection of a burst
  2. GRB 130606A: Chandra observation
  3. GRB 130912A: Swift/UVOT Upper Limits
  4. Fermi/GBM Detection of two SGR-like bursts possibly associated with SGR J1833-0832
  5. GRB 130912A: RATIR Optical and NIR Upper Limits
  6. Konus-Wind observation of GRB 130912A
  7. GRB 130912A: WHT confirmation of optical counterpart
  8. GRB 130907A: Continued RATIR Optical and NIR Observations
  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, Swift-BAT refined analysis
  15. GRB 130912A: GROND observations
  16. GRB 130912A: Swift detection of a short burst
  17. GRB 130907A: Continued RATIR Optical and NIR Observations
  18. GRB 130907A: RATIR Optical and NIR Observations
  19. GRB 130907A: Further Swift-BAT refined analysis
  20. GRB 130907A: INTEGRAL/SPI-ACS light curve
  21. Konus-Wind observation of GRB 130907A
  22. GRB 130907A, Swift-BAT refined analysis
  23. GRB 130907A: Swift-XRT refined Analysis
  24. GRB 120916A: Fermi-LAT detection of a burst
  25. GRB 130907A: Swift/UVOT Detection
  26. GRB 130907A: Early Tautenburg detections, red afterglow
  27. GRB 130907A: Skynet DSO-14/Yerkes-41/GORT confirmation of a fading afterglow
  28. GRB 130907A: RATIR Optical and NIR Afterglow Confirmation
  29. GRB 130907A: Skynet DSO-14/Yerkes-41 detections of a possible afterglow
  30. GRB 130831A: Maidanak optical observations
  31. GRB 130831A: ISON-UAFO optical observations
  32. GRB 130907A: Swift detection of a burst with an optical counterpart
  33. Swift follow-up results of the possible weak INTEGRAL GRB
  34. GRB 130903A: Swift/UVOT Upper Limits
  35. Swift follow-up of an INTEGRAL possible weak GRB
  36. GRB 130831A: RATIR Optical and NIR Upper Limits
  37. GRB 130903A: GROND Afterglow Discovery
  38. GRB 130903A: Fermi GBM observation
  39. GRB 130831A: JCMT SCUBA-2 sub-mm observation
  40. GRB 130903A: Swift-XRT observations
  41. Swift trigger 569022 is a new Galactic source Swift J1734.5-3027
  42. GRB 130903A: ISON-Kislovodsk optical Upper Limits
  43. GRB 130903A: GROND Upper Limits
  44. GRB 130831A: Swift/UVOT Observations
  45. GRB 130831A: Montarrenti Observatory optical follow-up
  46. GRB 130831A: RATIR Optical and NIR Observations
  47. GRB 130831A: Continued Skynet/PROMPT-SSO, PROMPT-CTIO and Yerkes-41 detections
  48. GRB 130831B, Swift-BAT refined analysis
  49. GRB 130831A: T100 observations
  50. GRB 130831B: Swift/UVOT Upper Limits
  51. GRB 130831B: GROND upper limits
  52. Swift Trigger 569022: a possible GRB
  53. GRB 130831A: THO optical observation
  54. GRB 130831A, Swift-BAT refined analysis
  55. GRB 130831B: Swift-XRT refined Analysis
  56. GRB 130831A: optical observations
  57. GRB 130831A: Swift-XRT refined Analysis
  58. GRB 130831A: Montarrenti Observatory optical observations
  59. GRB 130831A: Skynet/PROMPT-SSO detections
  60. Konus-Wind observation of GRB 130831A
  61. GRB 130831A: Gemini-North Redshift
  62. GRB 130831B: Swift detection of a burst
  63. GRB 130831A: Faulkes Telescope North and South optical afterglow
  64. GRB 130831A: Swift detection of a burst with an optical counterpart
  65. IPN triangulation of GRB 130828A - error box
  66. GRB 130829A: AAO optical observations
  67. GRB 130828A: Swift XRT and UVOT observations
  68. GRB 130829A: NOT optical observations
  69. IPN triangulation of GRB 130828A
  70. GRB 130829A: Swift detection of a burst
  71. GRB 130828A: Fermi GBM detection
  72. GRB 130828A: Fermi-LAT detection of a burst
  73. GRB 130822A Swift-BAT Spectral lag analysis
  74. GRB 130821A: Swift-XRT observation
  75. GRB 130822A: Gemini Observations
  76. GRB 130822A: Swift-XRT refined Analysis
  77. GRB 130822A: Swift/UVOT Upper Limits
  78. GRB 130822A, Swift-BAT refined analysis
  79. GRB 130821A: Fermi-LAT detection of a burst
  80. GRB 130822A: Weihai optical upper limit
  81. GRB 130821A: Fermi GBM Detection
  82. GRB 130822A: Swift detection of a short burst
  83. GRB 130816A: Swift/UVOT Upper Limits
  84. GRB 130816B: Swift/UVOT Upper Limits
  85. Fermi Gamma-ray Burst Monitor trigger 398555975 / 130818916 is not a GRB
  86. GRB 130816B, Swift-BAT refined analysis
  87. GRB 130816B: GROND afterglow candidate
  88. GRB 130816A: Swift-XRT refined Analysis
  89. GRB 130816A, Swift-BAT refined analysis
  90. GRB 130816A: Fermi GBM observation
  91. GRB 130816B: Swift-XRT refined Analysis
  92. GRB 130816A: GROND confirmation of afterglow
  93. GRB 130816B: Swift detection of a burst
  94. GRB 130816A: Swift detection of a burst
  95. Refined IPN Triangulation of GRB 130812B
  96. IPN Triangulation of GRB 130812B (long/soft)
  97. GRB 130812A: Swift/UVOT Upper Limits
  98. GRB 130812A, Swift-BAT refined analysis
  99. GRB 130812A: GROND upper limits
  100. GRB 130812A: Swift-XRT refined Analysis

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