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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"

6829 results found.

  1. GRB 180809A: Fermi GBM observation
  2. GRB 180809A: iTelescope optical limit
  3. GRB 180809A: Swift-XRT afterglow detection
  4. GRB 180806A: NOT optical observations
  5. GRB 180806A: Swift-XRT afterglow detection
  6. GRB 180806A: Fermi GBM detection
  7. GRB 180805A: Swift-XRT refined Analysis
  8. GRB 180805B: Swift-XRT refined Analysis
  9. GRB 180805B: Fermi GBM detection
  10. GRB 180728B: Fermi GBM detection
  11. GRB 180728A: Fermi GBM observation
  12. GRB 180728A: Swift-XRT refined Analysis
  13. GRB 180727A: Swift-XRT refined Analysis
  14. GRB 180727A: Fermi GBM observation
  15. GRB 180723A: Fermi GBM detection
  16. GRB 180722A: Swift-XRT observations
  17. GRB 180718B: Swift-XRT observations
  18. GRB 180718A: Swift-XRT observations
  19. GRB 180720C: Swift-XRT refined Analysis
  20. GRB 180721A: Swift-XRT refined Analysis
  21. GRB 180720C: Fermi GBM observation
  22. GRB 180706A: OSN detection
  23. GRB 180720B: Swift-XRT refined Analysis
  24. GRB 180720B: Fermi GBM observation
  25. GRB 180720B : Fermi-LAT detection
  26. GRB 180720A: Fermi GBM observation
  27. GRB 180718B: Fermi GBM detection
  28. GRB 180718B: Fermi-LAT detection
  29. GRB 180718A: Fermi GBM detection
  30. GRB 180715A: Swift-XRT observations
  31. GRB 180715A: Fermi GBM detection
  32. GRB 180715A: Swift-XRT observations
  33. IceCube-170922A: First Optical observations of the Neutrino Trigger by MASTER Global Net and 25 IceCube alerts inspection.
  34. GRB 180705A: OSN observations
  35. GRB 180709A: Swift-XRT refined Analysis
  36. GRB 180703B: further analysis of CGBM data
  37. GRB 180703A: Swift-XRT afterglow detection
  38. GRB 180705A: Swift-XRT refined Analysis
  39. GRB 180706A: Fermi GBM observation
  40. GRB 180706A: Swift-XRT refined Analysis
  41. GRB 180703B: Fermi GBM detection
  42. GRB 180703A: Fermi GBM detection
  43. GRB 180704A: Swift-XRT refined Analysis
  44. GRB 180703A: Swift-XRT observations
  45. GRB 180703B: Fermi-LAT detection
  46. GRB 180703A: Fermi-LAT detection
  47. GRB 180630A: Swift/UVOT Detection
  48. GRB 180630A: Swift-XRT refined Analysis
  49. GRB 180630A: Fermi GBM detection
  50. GRB 180626A: Swift-XRT refined Analysis
  51. GRB 180624A: Swift-XRT refined Analysis
  52. GRB 180623A: Swift-XRT refined Analysis
  53. Konus-Wind observation of GRB 180618A (a short GRB with extended emission)
  54. GRB 180613A: Afterglow confirmation and added photometry
  55. GRB 180620B: Swift-XRT refined Analysis
  56. GRB 180620B: Fermi GBM detection
  57. GRB 180620A: Swift-XRT refined Analysis
  58. GRB 180618A: Fermi GBM detection
  59. GRB 180618A: Swift-XRT refined Analysis
  60. GRB 180614A: Swift/UVOT Upper Limits
  61. GRB 180614A: Swift-XRT refined Analysis
  62. GRB 180613A: Possible IR afterglow
  63. GRB 180613A: Swift-XRT refined Analysis
  64. GRB 180611A: Fermi GBM observation
  65. GRB 180605A: Fermi GBM observation
  66. GRB 180602B: Fermi GBM detection
  67. GRB 180602A: Swift-XRT refined Analysis
  68. GRB 180514A: Swift/UVOT Upper Limits
  69. GRB 180514A: 1.5m OSN optical observations
  70. GRB 180514A: Swift-XRT refined Analysis
  71. GRB 180512A: Swift-XRT refined Analysis
  72. GRB 180510B: Swift-XRT refined Analysis
  73. GRB 180510A: Swift-XRT refined Analysis
  74. Chandra observations of GW170817 reveal a fading afterglow
  75. Chandra observations of GW170817 260 days since merger: first statistically significant evidence for an X-ray decay
  76. GRB 180505A: Fermi GBM detection
  77. GRB 180504A: Swift-XRT refined Analysis
  78. Konus-Wind observation of GRB 180427A
  79. GRB 180427A: Fermi GBM detection
  80. GRB 180425A: Swift-XRT refined Analysis
  81. GRB 180418A: Xinglong TNT optical upper limit
  82. GRB 180418A: Fermi GBM observation
  83. GRB 180418A: Swift-XRT refined Analysis
  84. LIGO/Virgo G299232: LOFAR follow-up
  85. GRB 180416A: Fermi GBM detection
  86. GRB 180409A: Swift-XRT afterglow detection
  87. GRB 180411B: CALET Gamma-Ray Burst Monitor detection
  88. GRB 180410A: Fermi GBM observation
  89. GRB 180411A: Fermi GBM detection
  90. GRB 180411A: Swift-XRT refined Analysis
  91. GRB 180410A: Swift-XRT refined Analysis
  92. GRB 180409A: Fermi GBM observation
  93. GRB 180409A: Swift-XRT observations
  94. Chandra observations of GRB161219B 400 days after the explosion
  95. GRB 180404A: Swift-XRT refined Analysis
  96. GRB 180404B: Swift-XRT refined Analysis
  97. GRB 180404B: Fermi GBM observation
  98. GRB 180402A: Swift-XRT refined Analysis
  99. GRB 180331B: Swift-XRT refined Analysis
  100. GRB 180331A: Swift-XRT refined Analysis

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