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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"

19664 results found.

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

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Download all Circulars as a .tar.gz archive (updated once a day):
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