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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"

27586 results found.

  1. GRB 100724B: Fermi GBM detection
  2. GRB 100724A: Swift/BAT spectral lag results
  3. GRB 100724A: Swift XRT refined analysis
  4. GRB 100724A: Swift/UVOT observations
  5. GRB 100724A: Swift-BAT refined analysis
  6. GRB 100724A, GROND detection of an afterglow candidate
  7. GRB 100724A: Swift detection of a burst
  8. GRB 100614A: 10.4-m GTC deep-optical limit
  9. GRB 100722A: Fermi GBM detection
  10. GRB 100718A: MASTER-Net optical prompt and alert observations
  11. GRB 100719A: Swift-BAT refined analysis
  12. GRB 100719A: Swift detection of a burst
  13. GRB 100713A: Swift XRT refined analysis
  14. Fermi GBM trigger 300794561 (100714419) is not a GRB
  15. GRB100713A: Swift/UVOT observations
  16. GRB 100713A: GROND upper limits
  17. GRB100713A: Swift X-ray afterglow detection
  18. GRB 100707A: Suzaku WAM observation of the prompt emission
  19. Fermi GBM trigger 300370702 (100709513) is not a GRB
  20. Konus-Wind observation of GRB 100707A
  21. GRB 100707A: Fermi GBM detection
  22. Tentative redshift of GRB100704A from Swift-XRT data
  23. Konus-Wind observation of GRB 100704A
  24. GRB 100703A: a short GRB detected by INTEGRAL
  25. GRB 100704A: Swift XRT refined analysis
  26. GRB 100704: Swift/UVOT Upper Limits
  27. GRB 100704A: Fermi GBM observation
  28. GRB 100704A: Swift-BAT refined analysis
  29. GRB 100704A: Swift detection of a burst
  30. GRB 100702A, Swift-BAT refined analysis
  31. Fermi GBM trigger 299767472 (100702531) is not a GRB
  32. GRB 100702A: Swift XRT refined analysis
  33. Swift/UVOT observations of GRB100702A
  34. GRB 100701B: Fermi GBM detection
  35. GRB 100702: ROTSE-III Optical Limits
  36. GRB 100702A: Swift detection of a short burst
  37. GRB 100625A: Fermi GBM detection
  38. GRB 100628A: GROND optical/NIR observations of the host candidate
  39. GRB 100628A: Gemini North Observations
  40. GRB 100628A: Swift XRT refined position
  41. GRB100625A: GROND confirmation of constant source
  42. GRB 100628A: Swift/UVOT Upper Limits
  43. GRB 100628A: Swift XRT detection of a possible X-ray afterglow
  44. GRB 100628A: INTEGRAL SPI-ACS light curve
  45. GRB 100628A: Swift-BAT refined analysis
  46. GRB 100628A: Swift detection of a short hard burst
  47. Swift-BAT trigger 426048 is not a burst
  48. GRB 100625A: Swift/UVOT Upper Limits
  49. GRB 100625A: Swift-BAT refined analysis
  50. Konus-Wind observation of GRB 100625A
  51. GRB 100625A: Swift-XRT Team refined analysis
  52. GRB100625A : MOA optical upper limit
  53. GRB 100625A: Swift detection of a short hard burst
  54. Konus-Wind observation of GRB 100621A
  55. GRB 100621A: IRSF/SIRIUS NIR Observation
  56. GRB 100619A: Correction to the Fermi GBM trigger time
  57. GRB 100621A: Swift/UVOT observations
  58. GRB 100621A: Swift XRT refined analysis
  59. GRB 100621A: Swift-BAT refined analysis
  60. GRB 100621A: GROND observation of bright NIR afterglow
  61. GRB 100621A: ROTSE-III Optical Limits
  62. GRB 100621A: Swift detection of a burst
  63. GRB 100606A: Optical Limits
  64. GRB 100619A: Fermi GBM detection
  65. GRB 100619A: Swift/UVOT Upper Limits
  66. GRB 100619A: Swift-XRT refind analysis
  67. GRB 100619A: Swift-BAT refined analysis
  68. GRB 100619A: Swift detection of a burst
  69. GRB 100615A: Gemini/NIRI Observations
  70. Fermi GBM trigger 100612038 is not a GRB
  71. GRB 100615A: Swift/UVOT Upper Limits
  72. GRB 100614A: Swift/UVOT Upper Limits
  73. GRB 100614A: NOT optical upper limits
  74. GRB 100614A: Swift-BAT refined analysis
  75. GRB 100615A: Fermi GBM detection
  76. GRB 100615A: Swift-BAT refined analysis
  77. GRB 100615A: Swift-XRT refined analysis
  78. GRB 100614A: Swift-XRT refined analysis
  79. GRB 100615A: GROND observations, upper limits
  80. GRB 100615A: PAIRITEL NIR Upper Limits
  81. GRB 100615A: Swift detection of a burst
  82. GRB 100614A: Liverpool Telescope Observations
  83. GRB 100614A: Swift detection of a burst
  84. GRB 100606A: Suzaku WAM observation of the prompt emission
  85. GRB 100606A: GROND observations
  86. Trigger 424161: Swift/BAT trigger on XTE J1946+274/GRO J1944+26
  87. Konus-Wind observation of GRB 100606A
  88. GRB 100606A: Swift/UVOT Upper Limits
  89. GRB 100606A Swift-XRT refined analysis
  90. GRB 100606A: Swift-BAT refined analysis
  91. Swift Trigger 424040 is not a GRB
  92. GRB 100606A: Swift detection of a burst
  93. Swift detection of outburst from the SFXT IGR J18410-0535
  94. GRB 100528A: GROND detection in all bands
  95. GRB100526B: GROND Upper limits
  96. GRB 100528A: Fermi GBM observation
  97. GRB 100526B: Swift-XRT confirmation of fading afterglow
  98. GRB 100526B: Swift/UVOT Upper Limits
  99. GRB 100526A: Swift/UVOT Upper Limits
  100. GRB 100526A: Swift XRT refined analysis

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