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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"

19539 results found.

  1. GRB 100724A: Swift XRT refined analysis
  2. GRB 100724A: Enhanced Swift-XRT position
  3. GRB 100724A: Swift/UVOT observations
  4. GRB 100724A: Swift-BAT refined analysis
  5. GRB 100724A, GROND detection of an afterglow candidate
  6. GRB 100724A: Swift detection of a burst
  7. GRB 100614A: 10.4-m GTC deep-optical limit
  8. GRB 100719A: Swift-BAT refined analysis
  9. GRB 100719A: Swift detection of a burst
  10. GRB 100713A: Swift XRT refined analysis
  11. GRB 100713A : IRSF/SIRIUS NIR upper limits
  12. GRB100713A: Swift/UVOT observations
  13. GRB 100713A: GROND upper limits
  14. GRB 100713A: optical upper limit
  15. GRB 100713A: TELMA and 1.5m OSN optical observations
  16. GRB100713A: Swift X-ray afterglow detection
  17. GRB 100628A: Chandra observations
  18. GRB 100628A: Swift XRT/UVOT refined analysis
  19. Tentative redshift of GRB100704A from Swift-XRT data
  20. Konus-Wind observation of GRB 100704A
  21. GRB 100704A: Swift XRT refined analysis
  22. GRB 100704: Swift/UVOT Upper Limits
  23. GRB 100704A: Fermi GBM observation
  24. GRB 100704A: Swift-BAT refined analysis
  25. GRB100704A: MOA optical upper limit
  26. GRB 100704A: Enhanced Swift-XRT position
  27. GRB 100704A: Swift detection of a burst
  28. GRB 100702A, Swift-BAT refined analysis
  29. GRB 100702A: Swift XRT refined analysis
  30. Swift/UVOT observations of GRB100702A - correction
  31. Swift/UVOT observations of GRB100702A
  32. GRB 100702: ROTSE-III Optical Limits
  33. GRB 100702A: Swift detection of a short burst
  34. GRB 100615A: Chandra X-ray ToO Observation
  35. GRB 100213B: Detection of Fading Optical Afterglow
  36. GRB 100625A: Fermi GBM detection
  37. GRB 100628A: Swift XRT refined position
  38. GRB100625A: GROND confirmation of constant source
  39. GRB100628A : MOA optical upper limit
  40. GRB 100628A: Swift/UVOT Upper Limits
  41. GRB 100628A: Swift XRT detection of a possible X-ray afterglow
  42. GRB 100628A: INTEGRAL SPI-ACS light curve
  43. GRB 100628A: Swift-BAT refined analysis
  44. GRB 100628A: Swift detection of a short hard burst
  45. Swift-BAT trigger 426048 is not a burst
  46. GRB 100614A: CrAO optical limit
  47. GRB 100625A: Swift/UVOT Upper Limits
  48. GRB 100625A: Swift-BAT refined analysis
  49. Konus-Wind observation of GRB 100625A
  50. GRB 100625A : IRSF/SIRIUS NIR upper limit
  51. GRB 100625A: Swift-XRT Team refined analysis
  52. GRB 100625A: Enhanced Swift-XRT position
  53. GRB100625A : MOA optical upper limit
  54. GRB 100625A: Swift detection of a short hard burst
  55. GRB 100418A: late time optical observations
  56. Konus-Wind observation of GRB 100621A
  57. GRB 100621A: IRSF/SIRIUS NIR Observation
  58. GRB 100621A MOA-II optical limit
  59. GRB 100621A: Swift/UVOT observations
  60. GRB 100621A: Swift XRT refined analysis
  61. GRB 100621A: Swift-BAT refined analysis
  62. GRB 100621A: GROND observation of bright NIR afterglow
  63. GRB 100621A: Enhanced Swift-XRT position
  64. GRB 100621A: Prompt enhanced Swift-XRT position
  65. GRB 100621A: ROTSE-III Optical Limits
  66. GRB 100621A: Swift detection of a burst
  67. GRB 100606A: Optical Limits
  68. GRB 100619A: Fermi GBM detection
  69. GRB 100619A: Swift/UVOT Upper Limits
  70. GRB 100619A: Swift-XRT refind analysis
  71. GRB 100619A: Enhanced Swift-XRT position
  72. GRB 100619A: Swift-BAT refined analysis
  73. GRB 100619A: Swift detection of a burst
  74. GRB 100615A: Swift/UVOT Upper Limits
  75. GRB 100614A: Swift/UVOT Upper Limits
  76. GRB 100614A: MASTER-Net optical alert observations
  77. GRB 100614A: Swift-BAT refined analysis
  78. GRB 100615A: Fermi GBM detection
  79. GRB 100615A: Swift-BAT refined analysis
  80. GRB 100614A: Enhanced Swift-XRT position
  81. GRB 100615A: Enhanced Swift-XRT position
  82. GRB 100615A: Swift-XRT refined analysis
  83. GRB 100614A: Swift-XRT refined analysis
  84. GRB 100615A: PAIRITEL NIR Upper Limits
  85. GRB 100615A: Swift detection of a burst
  86. GRB 100614A: Liverpool Telescope Observations
  87. GRB 100614A: Swift detection of a burst
  88. GRB 100606A: Suzaku WAM observation of the prompt emission
  89. Trigger 424161: Swift/BAT trigger on XTE J1946+274/GRO J1944+26
  90. Konus-Wind observation of GRB 100606A
  91. Radio detection of GRB100418a with ATCA
  92. GRB 100606A: Swift/UVOT Upper Limits
  93. GRB 100606A Swift-XRT refined analysis
  94. GRB 100606A: Swift-BAT refined analysis
  95. GRB 100606A: Enhanced Swift-XRT position
  96. Swift Trigger 424040 is not a GRB
  97. GRB 100606A: Prompt enhanced Swift-XRT position
  98. GRB 100606A: Swift detection of a burst
  99. Swift detection of outburst from the SFXT IGR J18410-0535
  100. GRB 100111A: Maidanak optical observations

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