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GCN Circulars

GCN Circulars are rapid bulletins submitted by and distributed to the community. 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"

23585 results found.

  1. GRB 130907A: Skynet DSO-14/Yerkes-41 detections of a possible afterglow
  2. GRB 130831A: Maidanak optical observations
  3. GRB 130831A: optical observation in Chuguev AO
  4. GRB 130831A: ISON-Kislovodsk optical observations
  5. GRB 130831A: optical observation in Gissar AO
  6. GRB 130831A: ISON-UAFO optical observations
  7. GRB 130907A: Swift detection of a burst with an optical counterpart
  8. Swift follow-up results of the possible weak INTEGRAL GRB
  9. GRB 130903A: Swift/UVOT Upper Limits
  10. Swift follow-up of an INTEGRAL possible weak GRB
  11. GRB 130831A: RATIR Optical and NIR Upper Limits
  12. GRB 130903A: GROND Afterglow Discovery
  13. GRB 130903A: Fermi GBM observation
  14. GRB 130903A: Swift-XRT observations
  15. GRB 130903A: ISON-Kislovodsk optical Upper Limits
  16. GRB 130903A: GROND Upper Limits
  17. GRB 130903A: A long GRB detected by INTEGRAL
  18. GRB 130831A: Swift/UVOT Observations
  19. GRB 130831A: Optical Observations via Virtual Telescope, follow-up
  20. GRB 130831A: RATIR Optical and NIR Observations
  21. GRB 130831A: Continued Skynet/PROMPT-SSO, PROMPT-CTIO and Yerkes-41 detections
  22. GRB 130831A: T100 observations
  23. GRB 130831B: Swift/UVOT Upper Limits
  24. GRB 130831A: CARMA mm upper limit
  25. GRB 130831B: GROND upper limits
  26. Swift Trigger 569022: a possible GRB
  27. GRB 130831A, Swift-BAT refined analysis
  28. GRB 130831B: Swift-XRT refined Analysis
  29. GRB 130831A: Optical Observations via Virtual Telescope
  30. GRB 130831B: Enhanced Swift-XRT position
  31. GRB 130831A: Skynet/PROMPT-SSO detections
  32. GRB 130831A: Enhanced Swift-XRT position
  33. GRB 130831A: MITSuME Akeno Optical observation
  34. GRB 130831A: Weihai optical observations
  35. GRB 130831B: Swift detection of a burst
  36. GRB 130831A: Swift detection of a burst with an optical counterpart
  37. IPN triangulation of GRB 130828A - error box
  38. GRB 130822A: optical upper limits
  39. GRB 130829A: AAO optical observations
  40. GRB 130828A: Swift XRT and UVOT observations
  41. GRB 130829A: NOT optical observations
  42. IPN triangulation of GRB 130828A
  43. GRB 130828A: Fermi GBM detection
  44. IPN triangulation of GRB130821A
  45. GRB 130821A: Weihai optical upper limit
  46. GRB 130821A: Swift-XRT observation
  47. GRB 130822A: 5.8 GHz VLA upper limit
  48. GRB 130822A: Swift/UVOT Upper Limits
  49. GRB 130822A: Enhanced Swift-XRT position
  50. GRB 130821A: Fermi-LAT detection of a burst
  51. GRB 130822A: Weihai optical upper limit
  52. GRB 130821A: Fermi GBM Detection
  53. GRB 130822A: Swift detection of a short burst
  54. GRB 130816A: Swift/UVOT Upper Limits
  55. GRB 130816B: Swift/UVOT Upper Limits
  56. GRB 130816B: GROND afterglow candidate
  57. GRB 130816A: Swift-XRT refined Analysis
  58. GRB 130816A, Swift-BAT refined analysis
  59. GRB 130816B: Enhanced Swift-XRT position
  60. GRB 130816A: GROND confirmation of afterglow
  61. GRB 130816A: Enhanced Swift-XRT position
  62. GRB 130816B: Swift detection of a burst
  63. GRB 130816A: REM NIR candidate afterglow
  64. GRB 130816A: Swift detection of a burst
  65. Konus-Wind observation of GRB 130812B
  66. IPN Triangulation of GRB 130812B (long/soft)
  67. GRB 130812A: Swift/UVOT Upper Limits
  68. GRB 130812A: GROND upper limits
  69. GRB 130812A: Swift-XRT refined Analysis
  70. GRB 130812A: Enhanced Swift-XRT position
  71. GRB 130812A: Swift detection of a burst
  72. GRB130807A: Swift/UVOT observations
  73. GRB 130807A: Swift-XRT refined analysis
  74. GRB 130806A: Swift/UVOT Upper Limits
  75. GRB 130807A, Swift-BAT refined analysis
  76. GRB 130807A: Swift detection of a GRB or Galactic transient
  77. Konus-Wind observation of GRB 130804A
  78. GRB 130623A: GROND detection of the optical/NIR afterglow
  79. GRB 130806A: MITSuME Akeno Optical observation
  80. GRB 130806A: Swift-XRT refined Analysis
  81. GRB 130806A: MITSuME Okayama upper limits
  82. IPN localization of GRB 130804A
  83. GRB130803A: GROND observations
  84. GRB 130806A: Enhanced Swift-XRT position
  85. GRB 130806A: Swift detection of a burst
  86. GRB 130804A; Fermi GBM observation
  87. Trigger 565443: Swift detection of a burst from SGR J1745-29
  88. GRB 130803A: Swift-XRT refined Analysis
  89. GRB 130803A: RATIR Optical and NIR Observations
  90. GRB130803A: GROND detection of possible host
  91. GRB 130803A: Swift/UVOT Upper Limits
  92. GRB 130803A: Enhanced Swift-XRT position
  93. GRB 130803A: Faulkes Telescope South Observations
  94. GRB 130803A: Swift detection of a burst
  95. GRB 130727A: Watcher optical limit
  96. GRB 130722A: RATIR Optical Observations
  97. GRB 130727A: Swift/UVOT Detection
  98. GRB 130727A: GROND observations
  99. GRB 130727A: Enhanced Swift-XRT position
  100. GRB 130727A: Swift-XRT observations

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