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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"

27282 results found.

  1. Swift Trigger on AXP CXOU J164710.2-455216/PSR J1647-4552
  2. GRB 180205A: Fermi GBM observation
  3. GRB 180205A: GROND detection of the NIR/optical afterglow
  4. GRB 180205A: KAIT optical afterglow confirmation
  5. GRB 180205A: Swift detection of a burst with a bright optical counterpart
  6. GRB 180204A: Swift-BAT refined analysis
  7. GRB 180204A: Swift/UVOT Upper Limits
  8. GRB 180204A: Fermi GBM detection
  9. GRB 180204A: Swift-XRT refined Analysis
  10. GRB 180204A: Swift detection of a short burst
  11. GRB 180126A CALET Gamma-Ray Burst Monitor detection
  12. GRB 180120A: AstroSat CZTI detection
  13. Fermi GBM trigger 538030981/180119210 is not a GRB
  14. LIGO/Virgo G298048 GRAWITA: VST-ESO PARANAL follow up of AT2017gfo
  15. GRB 180120A: Fermi GBM Detection
  16. GRB 180120A CALET Gamma-Ray Burst Monitor detection
  17. Fermi GBM trigger 538316685/180122517 is not a GRB
  18. GRB 180113B: AstroSat CZTI detection
  19. GRB 180113A: AstroSat CZTI detection
  20. GRB 180115A: SEDM Observations
  21. GRB 180116A CALET Gamma-Ray Burst Monitor detection
  22. Konus-Wind observation of GRB 171209A
  23. GRB 180113A CALET Gamma-Ray Burst Monitor detection
  24. GRB 180112A CALET Gamma-Ray Burst Monitor detection
  25. GRB 180116A: Fermi GBM Detection
  26. IPN Triangulation of GRB 180113B
  27. GRB 180112A: Insight-HXMT/HE detection/observation
  28. GRB 180111A AROMA-N optical observation
  29. GRB 180115A: Swift-BAT refined analysis
  30. GRB 180113C: Insight-HXMT/HE observation
  31. GRB 180113B: Insight-HXMT/HE observation
  32. GRB 180111A: Insight-HXMT/HE observation
  33. GRB 180115A: Swift-XRT refined Analysis
  34. GRB 180115A: Swift detection of a burst with an optical counterpart.
  35. GRB 180113C: Fermi GBM detection
  36. GRB 180111A CALET Gamma-Ray Burst Monitor detection
  37. GRB 180113A: Swift-BAT refined analysis
  38. GRB 180113B: Fermi GBM detection
  39. GRB 180113A: Fermi GBM observation
  40. GRB 180111A: Swift/UVOT Detection
  41. GRB 180113A: Swift detection of a burst
  42. GRB 180111A: Swift-BAT refined analysis
  43. GRB 180111A: RATIR Optical and NIR Observations
  44. GRB 180111A: Swift-XRT refined Analysis
  45. GRB 180111A: AGILE/MCAL detection
  46. GRB 180111A: Swift detection of a burst with an optical counterpart
  47. GRB 171230B: Insight-HXMT/HE detection
  48. GRB 171227A: AstroSat CZTI detection
  49. Fermi GBM Trigger 537135776/180108849 is not a GRB
  50. GRB 180103A: AstroSat CZTI detection
  51. GRB 171230A CALET Gamma-Ray Burst Monitor detection
  52. GRB 180103A: Swift detection of a burst
  53. GRB 171229A CALET Gamma-Ray Burst Monitor detection
  54. GRB 180102A AROMA-N optical observation
  55. GRB 180102A: Swift-BAT refined analysis
  56. GRB 180102A: Swift/UVOT Upper Limits
  57. GRB 180102A: NOT optical observations
  58. GRB 180102A: MASTER-Net robotic report
  59. GRB 180102A: Swift-XRT refined Analysis
  60. GRB 180102A: Fermi GBM detection
  61. GRB 180102A: Swift detection of a burst
  62. IPN Triangulation of GRB 171227A
  63. GRB 171227A: Fermi GBM detection
  64. GRB 171227A: AGILE/MCAL detection
  65. GRB 171215A: Insight-HXMT/HE detection
  66. GRB 171223A: Insight-HXMT/HE detection
  67. GRB 171212C CALET Gamma-Ray Burst Monitor detection
  68. GRB 171222A: Swift-BAT refined analysis
  69. GRB 171222A: AROMA-N optical observation
  70. GRB 171223A: Fermi GBM detection
  71. GRB 171222A: Fermi GBM detection
  72. GRB 171222A: Nanshan-0.36m optical upper limit
  73. GRB 171222A: Swift/UVOT Upper Limits
  74. GRB 171222A: Nanshan-1m optical afterglow detection
  75. GRB 171222A: MASTER-Net OT observations
  76. GRB 171222A: Swift-XRT refined Analysis
  77. GRB 171222A: NOT Optical Afterglow
  78. GRB 171216B CALET Gamma-Ray Burst Monitor detection
  79. GRB 171210A CALET Gamma-Ray Burst Monitor detection
  80. GRB 171222A: Swift detection of a burst
  81. GRB 171216A: Swift/UVOT Upper Limits
  82. GRB 171216A: Swift-XRT refined Analysis
  83. GRB 171216A: Swift-BAT refined analysis
  84. GRB 171216A: Swift detection of a burst
  85. Swift Trigger 797070: KAIT Optical Observations
  86. Swift Trigger 797070 is probably not a GRB
  87. GRB 171212A/Swift J1935.7+2036: Swift-BAT refined analysis
  88. GRB 171205A: ALMA observations
  89. GRB 171212A: Swift-XRT refined Analysis
  90. GRB 171211A iTelescope observation
  91. GRB 171212B: Fermi GBM observation
  92. GRB 171212A/Swift J1935.7+2036: Swift/UVOT Upper Limits
  93. GRB 171212B: Fermi-LAT detection
  94. GRB 171212A: Swift detection of a burst or a Galactic transient
  95. GRB 171205A: JCMT SCUBA-2 sub-mm observations
  96. GRB 171211A: Swift-BAT refined analysis
  97. GRB 171211A: Swift-XRT refined Analysis
  98. GRB 171211A: Swift/UVOT Upper Limits
  99. GRB 171210A: MASTER-Net optical observations
  100. GRB 171209A: MASTER-Net optical observations

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