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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"

26565 results found.

  1. GRB 100728A: Fermi GBM observation
  2. GRB 100728A: Enhanced Swift-XRT position
  3. GRB 100728A: Swift detection of a burst
  4. GRB 100727A: Swift XRT refined analysis
  5. GRB 100727A: Fermi GBM observation
  6. GRB 100727A, Swift-BAT refined analysis
  7. GRB 100727A: Enhanced Swift-XRT position
  8. GRB 100727A: Swift detection of a burst
  9. GRB100725B: MITSuME optical upper limits
  10. GRB 100724B: AGILE/GRID analysis
  11. GRB 100724B: Suzaku WAM observation of the prompt emission
  12. GRB 100724B: gamma-ray detection by AGILE
  13. GRB 100725B: refined XRT analysis
  14. GRB 100725A: GROND upper limits
  15. GRB 100725B: Swift/UVOT Upper Limits
  16. GRB 100725A: Swift/UVOT Upper Limits
  17. GRB 100725A: Swift XRT refined analysis
  18. GRB 100725B: Enhanced Swift-XRT position
  19. GRB 100725A: Enhanced Swift-XRT position
  20. GRB 100725B: Swift detection of a burst
  21. GRB 100725A: Swift detection of a burst
  22. GRB 100724B: Fermi GBM detection
  23. GRB 100724A: Swift/BAT spectral lag results
  24. GRB 100724A: Swift XRT refined analysis
  25. GRB 100724A: Enhanced Swift-XRT position
  26. GRB 100724A: Swift/UVOT observations
  27. GRB 100724A: Swift detection of a burst
  28. GRB 100614A: 10.4-m GTC deep-optical limit
  29. GRB 100722A: Fermi GBM detection
  30. GRB 100718A: MASTER-Net optical prompt and alert observations
  31. GRB 100719A: Swift-BAT refined analysis
  32. GRB 100713A: optical observation in Maidanak
  33. GRB 100713A: Swift XRT refined analysis
  34. GRB 100713A: GROND upper limits
  35. GRB 100713A: optical upper limit
  36. GRB 100713A: TNG optical observations
  37. GRB 100713A: TELMA and 1.5m OSN optical observations
  38. GRB100713A: Swift X-ray afterglow detection
  39. GRB 100713A: a long GRB detected by INTEGRAL
  40. GRB 100707A: Suzaku WAM observation of the prompt emission
  41. Konus-Wind observation of GRB 100707A
  42. GRB 100707A: Fermi GBM detection
  43. GRB 100628A: Chandra observations
  44. Tentative redshift of GRB100704A from Swift-XRT data
  45. Konus-Wind observation of GRB 100704A
  46. GRB 100704A: Swift XRT refined analysis
  47. GRB 100704: Swift/UVOT Upper Limits
  48. GRB 100704A: Fermi GBM observation
  49. GRB 100704A: Enhanced Swift-XRT position
  50. GRB 100704A: Swift detection of a burst
  51. GRB 100615A: Additional Gemini/NIRI observations
  52. GRB 100526A: Gemini/NIRI afterglow confirmation and host galaxy
  53. GRB 100702A: Swift XRT refined analysis
  54. Swift/UVOT observations of GRB100702A
  55. GRB 100701B: Fermi GBM detection
  56. GRB 100702A: Magellan near-IR observations
  57. GRB 100702A: VLT optical observations
  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: GROND optical/NIR observations of the host candidate
  64. GRB 100628A: Gemini North Observations
  65. GRB100625A: GROND confirmation of constant source
  66. GRB 090709A: Host galaxy detection
  67. GRB 100628A: Swift/UVOT Upper Limits
  68. GRB100628A: RTT150 optical observations
  69. GRB 100628A: Swift detection of a short hard burst
  70. GRB 100614A: CrAO optical limit
  71. GRB 100625A: Swift/UVOT Upper Limits
  72. Konus-Wind observation of GRB 100625A
  73. GRB 100625A: Swift-XRT Team refined analysis
  74. GRB 100625A: Enhanced Swift-XRT position
  75. GRB 100625A: Swift detection of a short hard burst
  76. GRB 100418A: late time optical observations
  77. Konus-Wind observation of GRB 100621A
  78. GRB 100621A: IRSF/SIRIUS NIR Observation
  79. GRB 100621A: Swift/UVOT observations
  80. GRB 100621A: Swift XRT refined analysis
  81. GRB 100621A: GROND observation of bright NIR afterglow
  82. GRB 100621A: Enhanced Swift-XRT position
  83. GRB 100621A: ROTSE-III Optical Limits
  84. GRB 100621A: Swift detection of a burst
  85. GRB 100606A: Optical Limits
  86. GRB 100619A: Fermi GBM detection
  87. GRB 100619A: Swift/UVOT Upper Limits
  88. GRB 100619A: Swift-XRT refind analysis
  89. GRB 100619A: Enhanced Swift-XRT position
  90. GRB 100619A: Swift detection of a burst
  91. GRB 100614A: Gemini/NIRI Observations
  92. GRB 100615A: Gemini/NIRI Observations
  93. GRB 100615A: Swift/UVOT Upper Limits
  94. GRB 100614A: Swift/UVOT Upper Limits
  95. GRB 100614A: NOT optical upper limits
  96. GRB 100615A: Fermi GBM detection
  97. GRB 100615A: Swift-BAT refined analysis
  98. GRB 100614A: Enhanced Swift-XRT position
  99. GRB 100615A: Enhanced Swift-XRT position
  100. GRB 100615A: Swift-XRT refined analysis

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