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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"

19663 results found.

  1. GRB 100728B: Skynet/PROMPT Detections (correction)
  2. GRB 100728B: KAIT optical afterglow detection (correction)
  3. GRB 100728B: Swift detection of a burst with an optical counterpart
  4. GRB 100728A: Skynet/PROMPT Detections
  5. GRB 100728A: Fermi GBM observation
  6. GRB 100728A: Enhanced Swift-XRT position
  7. GRB 100728A: Swift detection of a burst
  8. GRB 100727A: Swift XRT refined analysis
  9. GRB 100727A: Fermi GBM observation
  10. GRB 100727A, Swift-BAT refined analysis
  11. GRB 100727A: Enhanced Swift-XRT position
  12. GRB100727A: MOA optical upper limit
  13. GRB 100727A: Swift detection of a burst
  14. GRB 100725B: Swift-BAT refined analysis
  15. GRB 100725B: refined XRT analysis
  16. GRB 100725B: Swift/UVOT Upper Limits
  17. GRB 100725A: Swift/UVOT Upper Limits
  18. GRB 100725A: Swift-BAT refined analysis
  19. GRB 100725A: Swift XRT refined analysis
  20. GRB 100725B: Enhanced Swift-XRT position
  21. GRB 100725A: Enhanced Swift-XRT position
  22. GRB100725B: Faulkes Telescope North observations
  23. GRB 100725B: Swift detection of a burst
  24. GRB 100725A: Prompt enhanced Swift-XRT position
  25. GRB 100725A: Swift detection of a burst
  26. GRB 100724A: Swift/BAT spectral lag results
  27. GRB 100724A: Swift XRT refined analysis
  28. GRB 100724A: Enhanced Swift-XRT position
  29. GRB 100724A: Swift/UVOT observations
  30. GRB 100724A: Swift-BAT refined analysis
  31. GRB 100724A, GROND detection of an afterglow candidate
  32. GRB 100724A: Swift detection of a burst
  33. GRB 100614A: 10.4-m GTC deep-optical limit
  34. GRB 100719A: Swift-BAT refined analysis
  35. GRB 100719A: Swift detection of a burst
  36. GRB 100713A: Swift XRT refined analysis
  37. GRB 100713A : IRSF/SIRIUS NIR upper limits
  38. GRB100713A: Swift/UVOT observations
  39. GRB 100713A: GROND upper limits
  40. GRB 100713A: optical upper limit
  41. GRB 100713A: TELMA and 1.5m OSN optical observations
  42. GRB100713A: Swift X-ray afterglow detection
  43. GRB 100628A: Chandra observations
  44. GRB 100628A: Swift XRT/UVOT refined analysis
  45. Tentative redshift of GRB100704A from Swift-XRT data
  46. Konus-Wind observation of GRB 100704A
  47. GRB 100704A: Swift XRT refined analysis
  48. GRB 100704: Swift/UVOT Upper Limits
  49. GRB 100704A: Fermi GBM observation
  50. GRB 100704A: Swift-BAT refined analysis
  51. GRB100704A: MOA optical upper limit
  52. GRB 100704A: Enhanced Swift-XRT position
  53. GRB 100704A: Swift detection of a burst
  54. GRB 100702A, Swift-BAT refined analysis
  55. GRB 100702A: Swift XRT refined analysis
  56. Swift/UVOT observations of GRB100702A - correction
  57. Swift/UVOT observations of GRB100702A
  58. GRB 100702: ROTSE-III Optical Limits
  59. GRB 100702A: Swift detection of a short burst
  60. GRB 100615A: Chandra X-ray ToO Observation
  61. GRB 100213B: Detection of Fading Optical Afterglow
  62. GRB 100625A: Fermi GBM detection
  63. GRB 100628A: Swift XRT refined position
  64. GRB100625A: GROND confirmation of constant source
  65. GRB100628A : MOA optical upper limit
  66. GRB 100628A: Swift/UVOT Upper Limits
  67. GRB 100628A: Swift XRT detection of a possible X-ray afterglow
  68. GRB 100628A: INTEGRAL SPI-ACS light curve
  69. GRB 100628A: Swift-BAT refined analysis
  70. GRB 100628A: Swift detection of a short hard burst
  71. Swift-BAT trigger 426048 is not a burst
  72. GRB 100614A: CrAO optical limit
  73. GRB 100625A: Swift/UVOT Upper Limits
  74. GRB 100625A: Swift-BAT refined analysis
  75. Konus-Wind observation of GRB 100625A
  76. GRB 100625A : IRSF/SIRIUS NIR upper limit
  77. GRB 100625A: Swift-XRT Team refined analysis
  78. GRB 100625A: Enhanced Swift-XRT position
  79. GRB100625A : MOA optical upper limit
  80. GRB 100625A: Swift detection of a short hard burst
  81. GRB 100418A: late time optical observations
  82. Konus-Wind observation of GRB 100621A
  83. GRB 100621A: IRSF/SIRIUS NIR Observation
  84. GRB 100621A MOA-II optical limit
  85. GRB 100621A: Swift/UVOT observations
  86. GRB 100621A: Swift XRT refined analysis
  87. GRB 100621A: Swift-BAT refined analysis
  88. GRB 100621A: GROND observation of bright NIR afterglow
  89. GRB 100621A: Enhanced Swift-XRT position
  90. GRB 100621A: Prompt enhanced Swift-XRT position
  91. GRB 100621A: ROTSE-III Optical Limits
  92. GRB 100621A: Swift detection of a burst
  93. GRB 100606A: Optical Limits
  94. GRB 100619A: Fermi GBM detection
  95. GRB 100619A: Swift/UVOT Upper Limits
  96. GRB 100619A: Swift-XRT refind analysis
  97. GRB 100619A: Enhanced Swift-XRT position
  98. GRB 100619A: Swift-BAT refined analysis
  99. GRB 100619A: Swift detection of a burst
  100. GRB 100615A: Swift/UVOT Upper Limits

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