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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"

36142 results found.

  1. GRB 180305A: Swift-XRT afterglow detection
  2. Konus-Wind observation of GRB 180305A
  3. GRB 180305A: RATIR Optical Afterglow Candidate
  4. GRB 180305A: Swift ToO observations
  5. GRB 180305A: Fermi GBM detection
  6. GRB 180305A: Fermi-LAT detection
  7. GRB 180221B: Insight-HXMT/HE observation
  8. Fermi GBM trigger 541402602/180227234 is not a GRB
  9. GRB 180224A: Swift/UVOT Detection
  10. Konus-Wind observation of GRB 180223A
  11. GRB 180224A: OASDG optical observations
  12. IPN Triangulation of GRB 180223A (long)
  13. GRB 180210A: Insight-HXMT/HE observation
  14. GRB 180224A: AbAO optical observations
  15. GRB 180224A: Swift-BAT refined analysis
  16. GRB 180224A: RATIR Optical Observations
  17. GRB 180224A: Swift-XRT refined Analysis
  18. GRB 180224A: Enhanced Swift-XRT position
  19. GRB 180224A: Swift detection of a burst with an optical counterpart
  20. GRB 180218A: AstroSat CZTI detection
  21. MAXI J1813-095 source: AbAO optical observations
  22. GRB 180222A: Swift/UVOT Upper Limits
  23. GRB 180221B CALET Gamma-Ray Burst Monitor detection
  24. GRB 180222A: Swift-XRT refined Analysis
  25. GRB 180222A: Swift-BAT refined analysis
  26. GRB 180222A: Enhanced Swift-XRT position
  27. GRB 180222A: A long GRB detected by INTEGRAL
  28. GRB 180222A: Swift detection of a burst
  29. Swift trigger 811074 (possible GRB 180221A): Swift refined analysis
  30. GRB 180205A: Mondy optical observations
  31. GRB 180219A CALET Gamma-Ray Burst Monitor detection
  32. GRB180221A: MASTER-OAFA optical observations
  33. Swift Trigger 811074: possible GRB 180221A
  34. Konus-Wind observation of GRB 180218A
  35. GRB 180218A CALET Gamma-Ray Burst Monitor detection
  36. GRB 180218A: Fermi GBM Detection
  37. IPN Triangulation of GRB 180218A (long/bright)
  38. GRB 180204A: 15 GHz upper limits from AMI
  39. GRB 180112A: AstroSat CZTI detection
  40. Konus-Wind observation of GRB 180210A
  41. GRB 180205A: SEDM Observations
  42. GRB 180210A: Swift-XRT afterglow detection
  43. GRB 180210A: Tiled Swift observations
  44. GRB 180205A: BAO optical observations
  45. GRB 180210A: Swift ToO observations
  46. GRB 180210A: Fermi-LAT detection
  47. GRB 180210A: Fermi GBM detection
  48. Trigger 809217: Swift trigger on RS CVn Star HD 8357
  49. GRB180205A: Optical observations with DOAO 1m telescope
  50. GRB 180205A: AbAO optical observations
  51. GRB 180205A optical observations
  52. GRB 180202A: Insight-HXMT/HE detection
  53. GRB 180204A: MITSuME Okayama optical upper limits
  54. GRB 180205A: confirmation of Swift-BAT trigger time.
  55. GRB 180205A: Optical observations
  56. GRB 180205A: Swift/UVOT Detection
  57. GRB 180205A: Nanshan-1m optical observations
  58. GRB 180205A: Swift-XRT refined Analysis
  59. GRB 180205A: Swift-BAT refined analysis
  60. GRB 180205A: Xinglong TNT optical observation
  61. GRB 180205A: Further GROND Observations reveal Afterglow is still bright
  62. GRB 180205A: Nickel telescope optical observations
  63. GRB 180205A: VLT polarimetry
  64. GRB 180205A: Mondy optical observations
  65. GRB 180205A: Fermi GBM observation
  66. Konus-Wind observation of GRB 180204A
  67. GRB 180205A: VLT/X-shooter redshift
  68. GRB 180205A: GROND detection of the NIR/optical afterglow
  69. GRB 180205A: KAIT optical afterglow confirmation
  70. GRB 180205A: Swift detection of a burst with a bright optical counterpart
  71. GRB 180204A: Swift-BAT refined analysis
  72. GRB 180204A: Swift/UVOT Upper Limits
  73. GRB 180204A: Fermi GBM detection
  74. GRB 180204A: Enhanced Swift-XRT position
  75. GRB 180204A: Swift-XRT refined Analysis
  76. GRB 180204A: Swift detection of a short burst
  77. GRB 180126A CALET Gamma-Ray Burst Monitor detection
  78. GRB 180120A: AstroSat CZTI detection
  79. Fermi GBM trigger 538030981/180119210 is not a GRB
  80. GRB 180120A: Fermi GBM Detection
  81. GRB 180120A CALET Gamma-Ray Burst Monitor detection
  82. Fermi GBM trigger 538316685/180122517 is not a GRB
  83. GRB 180113B: AstroSat CZTI detection
  84. GRB 180113A: AstroSat CZTI detection
  85. GRB 180115A: SEDM Observations
  86. GRB 180116A CALET Gamma-Ray Burst Monitor detection
  87. Konus-Wind observation of GRB 171209A
  88. GRB 180113A CALET Gamma-Ray Burst Monitor detection
  89. GRB 180112A CALET Gamma-Ray Burst Monitor detection
  90. GRB 180115A: Swift/UVOT Detection
  91. GRB 180116A: Fermi GBM Detection
  92. Konus-Wind observation of GRB 180113B
  93. IPN Triangulation of GRB 180113B
  94. GRB 180112A: Insight-HXMT/HE detection/observation
  95. GRB 180111A AROMA-N optical observation
  96. Konus-Wind observation of GRB 180113C
  97. e-MERLIN detection of GRB 171205A
  98. IPN Triangulation of GRB 180113C
  99. GRB 180115A: Swift-BAT refined analysis
  100. GRB 180116A: MAXI/GSC detection

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