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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"

6667 results found.

  1. GRB 140919A: Fermi GBM observation
  2. GRB 140916A: Swift-XRT refined Analysis
  3. GRB 140909A: Confirmation of the Swift-XRT afterglow
  4. GRB 140909A: Swift-XRT observations
  5. GRB 140907A: Nishi-Harima NIR Observations
  6. GRB 140907A: MITSuME Akeno Optical Observation
  7. GRB 140907A: T100 observations
  8. GRB 140907A: Fermi GBM Detection
  9. GRB 140907A: Swift-XRT refined Analysis
  10. GRB 140907A : Virtual Telescope optical observations
  11. GRB 140906B: Fermi GBM Detection of a Long GRB
  12. GRB 140906A - Fermi GBM Detection
  13. GRB 140901B: Swift XRT observation
  14. GRB 140901B: Fermi GBM detection
  15. GRB 140903A: Swift-XRT refined Analysis
  16. GRB 140901A: Fermi GBM detection
  17. GRB 140831A: iPTF observations of a possible short burst detected by Fermi GBM
  18. GRB 140829A: Fermi GBM Detection
  19. GRB 140828A: Fermi GBM observation
  20. GRB 140824B: Swift observations
  21. GRB 140824B: Fermi GBM Detection
  22. GRB 140821A: Fermi GBM Detection
  23. GRB 140824A: Swift-XRT refined Analysis
  24. Fermi trigger 430148973: Swift-XRT observation
  25. GRB 140818B: Swift-XRT refined Analysis
  26. GRB 140818B: Fermi GBM detection
  27. GRB 140818A - Fermi GBM Detection
  28. GRB 140818A: Swift-XRT and UVOT potential afterglow detection
  29. GRB 140817A: Swift-XRT refined Analysis
  30. GRB 140817A: Fermi GBM Detection
  31. GRB 140815A: Swift-XRT observations
  32. GRB 140814A: Swift-XRT and UVOT observations
  33. GRB 140814A: Swift-XRT and UVOT observations
  34. GRB 140808A: Confirmation of the Swift-XRT afterglow
  35. GRB140809A: Fermi GBM observation
  36. GRB 140810A: Fermi GBM observation
  37. GRB140810A: Fermi-LAT detection
  38. Swift observations of possible GRB 140809A candidate
  39. GRB 140808A: Swift/UVOT Upper Limits
  40. GRB 140808A: Swift-XRT observations
  41. GRB140801A: Swift/XRT further observations
  42. GRB 140801A: Swift/UVOT Upper Limits
  43. GRB 140801A: Swift-XRT observations
  44. GRB 140801A: Fermi GBM observation
  45. GRB 140730A: Swift-XRT refined Analysis
  46. GRB 140729A: Swift-XRT and UVOT observations
  47. GRB 140729A: Fermi-GBM detection
  48. GRB 140729A: Fermi-LAT detection
  49. GRB 140723A: Swift-XRT and UVOT observations
  50. GRB 140723A: Fermi GBM detection
  51. GRB 140723A: Fermi-LAT detection
  52. GRB 140719B: Swift XRT observation
  53. GRB 140721A: Fermi GBM detection
  54. GRB 140716A: Confirmation of the Swift-XRT afterglow
  55. GRB 140719A: Swift-XRT refined Analysis
  56. GRB 140716A: Swift-XRT detection of an afterglow candidate
  57. GRB 140716A: A Fermi GBM Detection
  58. Swift observations of a flare from UX Ari
  59. GRB 140714A: Fermi GBM detection
  60. GRB 140713A: Swift-XRT refined Analysis
  61. GRB 140713A: T100 observations
  62. GRB 140710B: Fermi GBM detection
  63. GRB 140710A: Swift-XRT refined Analysis
  64. GRB 140709B: Swift-XRT refined Analysis
  65. GRB 140709A: Fermi GBM detection
  66. GRB 140709A: Swift-XRT refined Analysis
  67. GRB 140706A: Swift-XRT refined Analysis
  68. GRB 140705A: Swift-XRT refined Analysis
  69. GRB 140629A: SAO RAS Rc band photometry
  70. GRB 140629A, Optical observations
  71. GRB 140703A: Fermi GBM detection
  72. GRB 140703A: Swift-XRT refined Analysis
  73. GRB 140629A: Nishi-Harima NIR Observations
  74. GRB 140629A: Swift-XRT refined Analysis
  75. GRB 140629A: T100 observations
  76. GRB 140629A: NOT optical observations
  77. GRB 140629A : Virtual Telescope optical observations
  78. GRB 140628A: Swift-XRT refined Analysis
  79. GRB 140628A: Swift/UVOT Detection
  80. Swift Trigger 602668: XRT and UVOT confirm is not astrophysical source
  81. GRB 140623A: further Swift-XRT observations
  82. GRB 140626A: Swift-XRT refined Analysis
  83. Further Swift/XRT observations of GRB140620A/iPTFcva
  84. GRB 140624A: Fermi GBM observation of a short burst
  85. GRB 140623A: Swift-XRT and UVOT observations
  86. GRB 140623A / iPTF14cyb: Fermi GBM detection
  87. GRB 140621A: Swift-XRT observations
  88. GRB 140621A: Fermi GBM detection
  89. GRB 140622A: Swift-XRT refined Analysis
  90. GRB 140620A: Swift/UVOT Detection
  91. GRB 140620A: Swift-XRT observations
  92. GRB 140620A / iPTF14cva: Fermi GBM observations
  93. GRB 140619B: Swift-XRT observations
  94. GRB 140619B: Fermi-LAT Detection
  95. GRB 140619B: Fermi GBM detection of a short GRB
  96. GRB 140619A: Swift-XRT refined Analysis
  97. GRB 140606B: Swift XRT final light curve
  98. GRB 140614B: MOSFIRE Ks-band nondetection
  99. GRB 140614B: Swift-XRT refined Analysis
  100. GRB 140614A: Swift-XRT refined Analysis

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Download all Circulars as a .tar.gz archive:
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