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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"

42584 results found.

  1. GRB 130822A: nearby galaxy redshifts
  2. GRB 130903A: GROND Afterglow Discovery
  3. GRB 130903A: MASTER early optical limit
  4. GRB 130903A: Fermi GBM observation
  5. GRB 130831A: JCMT SCUBA-2 sub-mm observation
  6. GRB 130903A: Swift-XRT observations
  7. Swift trigger 569022 is a new Galactic source Swift J1734.5-3027
  8. GRB 130903A: ISON-Kislovodsk optical Upper Limits
  9. GRB 130903A: GROND Upper Limits
  10. GRB 130903A: A long GRB detected by INTEGRAL
  11. GRB 130831A: Swift/UVOT Observations
  12. GRB 130831A: Optical Observations via Virtual Telescope, follow-up
  13. GRB 130831A: RATIR Optical and NIR Observations
  14. GRB 130831A: Continued Skynet/PROMPT-SSO, PROMPT-CTIO and Yerkes-41 detections
  15. GRB 130831B, Swift-BAT refined analysis
  16. GRB 130831A: VLA Observations
  17. GRB 130831A: T100 observations
  18. GRB 130831A: CARMA mm upper limit
  19. GRB 130831B: GROND upper limits
  20. Swift Trigger 569022: a possible GRB
  21. GRB 130831A: THO optical observation
  22. GRB 130831A, Swift-BAT refined analysis
  23. GRB 130831B: Swift-XRT refined Analysis
  24. GRB 130831A: optical observations
  25. GRB 130831A: Optical Observations via Virtual Telescope
  26. GRB 130831A: Swift-XRT refined Analysis
  27. GRB 130831B: Enhanced Swift-XRT position
  28. GRB 130831A: Skynet/PROMPT-SSO detections
  29. GRB 130831A: Enhanced Swift-XRT position
  30. GRB 130831A : Xinglong 60cm optical observation
  31. Konus-Wind observation of GRB 130831A
  32. GRB 130831A: Gemini-North Redshift
  33. GRB 130831B: Swift detection of a burst
  34. GRB 130831A: Faulkes Telescope North and South optical afterglow
  35. GRB 130831A: Swift detection of a burst with an optical counterpart
  36. IPN triangulation of GRB 130828A - error box
  37. GRB 130822A: optical upper limits
  38. GRB 130829A: AAO optical observations
  39. GRB 130828A: Swift XRT and UVOT observations
  40. GRB 130829A: NOT optical observations
  41. IPN triangulation of GRB 130828A
  42. GRB 130829A: Swift detection of a burst
  43. GRB 130828A Tiled Swift observations
  44. GRB 130828A: Fermi GBM detection
  45. GRB 130828A: Fermi-LAT detection of a burst
  46. IPN triangulation of GRB130821A
  47. GRB 130822A Swift-BAT Spectral lag analysis
  48. Konus-Wind observation of GRB 130821A
  49. GRB 130821A: Weihai optical upper limit
  50. GRB 130821A: Swift-XRT observation
  51. GRB 130822A: 5.8 GHz VLA upper limit
  52. GRB 130822A: Gemini Observations
  53. GRB 130822A: Swift-XRT refined Analysis
  54. GRB 130822A: WHT ACAM observations
  55. GRB 130822A: Swift/UVOT Upper Limits
  56. GRB 130822A: Enhanced Swift-XRT position
  57. GRB 130822A, Swift-BAT refined analysis
  58. GRB 130821A: Fermi-LAT detection of a burst
  59. GRB 130822A: Weihai optical upper limit
  60. GRB 130821A: Fermi GBM Detection
  61. GRB 130822A: Swift detection of a short burst
  62. Fermi Gamma-ray Burst Monitor trigger 398555975 / 130818916 is not a GRB
  63. GRB 130816B, Swift-BAT refined analysis
  64. GRB 130816B: GROND afterglow candidate
  65. GRB 130816A: Swift-XRT refined Analysis
  66. GRB 130816A, Swift-BAT refined analysis
  67. GRB 130816A: Fermi GBM observation
  68. GRB 130816B: Swift-XRT refined Analysis
  69. GRB 130816B: Enhanced Swift-XRT position
  70. GRB 130816A: GROND confirmation of afterglow
  71. GRB 130816A: Enhanced Swift-XRT position
  72. GRB 130816B: Swift detection of a burst
  73. GRB 130816A: REM NIR candidate afterglow
  74. GRB 130816A: Swift detection of a burst
  75. Refined IPN Triangulation of GRB 130812B
  76. Konus-Wind observation of GRB 130812B
  77. IPN Triangulation of GRB 130812B (long/soft)
  78. GRB 130812A: Swift/UVOT Upper Limits
  79. GRB 130812A, Swift-BAT refined analysis
  80. GRB 130812A: GROND upper limits
  81. GRB 130812A: Swift-XRT refined Analysis
  82. GRB 130812A: Enhanced Swift-XRT position
  83. GRB 130812A: Swift detection of a burst
  84. GRB130807A: Swift/UVOT observations
  85. GRB 130807A: Swift-XRT refined analysis
  86. GRB 130807A, Swift-BAT refined analysis
  87. GRB 130807A: Swift detection of a GRB or Galactic transient
  88. Konus-Wind observation of GRB 130804A
  89. GRB 130623A: GROND detection of the optical/NIR afterglow
  90. GRB 130806A: Swift-XRT refined Analysis
  91. GRB 130806A, Swift-BAT refined analysis
  92. IPN localization of GRB 130804A
  93. SGR 1745-29 (Swift trigger 565443), Swift-BAT refined analysis
  94. GRB130803A: GROND observations
  95. GRB 130806A: Enhanced Swift-XRT position
  96. GRB 130806A: Swift detection of a burst
  97. GRB 130804A; Fermi GBM observation
  98. Trigger 565443: Swift detection of a burst from SGR J1745-29
  99. GRB 130803A: Swift-XRT refined Analysis
  100. GRB 130803A: RATIR Optical and NIR Observations

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