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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"

6831 results found.

  1. LIGO/Virgo G296853: Fermi-LAT search for high-energy gamma-ray counterpart
  2. GRB 170808B: Fermi LAT Detection
  3. GRB 170808B: Fermi GBM observation
  4. GRB 170728B: TShAO, SAO RAS and AbAO optical observations
  5. GRB 170804A: Swift-XRT refined Analysis
  6. GRB 170803A: Swift/UVOT Detection
  7. Swift Trigger 766161 is not a GRB
  8. GRB 170803A: Swift-XRT refined Analysis
  9. GRB 170803A: Fermi GBM observation
  10. GRB 170802A: Fermi GBM detection
  11. GRB 170714A: Chandra observations
  12. GRB 170728B: Fermi GBM detection
  13. GRB 170728B: I-band detection from 1.5m OSN
  14. GRB 170728B: Fermi-LAT detection
  15. GRB 170728A: Swift-XRT refined Analysis
  16. GRB 170728B: Swift-XRT refined Analysis
  17. GRB 170728B: TNG optical afterglow candidate
  18. LIGO/Virgo G275697: LOFAR follow-up
  19. GRB 170714A: Bastille Day Burst: ULGRB or RTDE?
  20. GRB 170714A: Swift-XRT refined Analysis
  21. GRB 170711A: Swift-XRT refined Analysis
  22. GRB 170711A: Fermi GBM observation
  23. GRB 170710B: Fermi GBM observation
  24. GRB 170710B: Swift-XRT and UVOT observations
  25. GRB 170710A: Swift-XRT refined Analysis
  26. LIGO/Virgo G288732: Konus-Wind observations
  27. Konus-Wind observation of GRB 170705A
  28. GRB 170705A: Fermi GBM observation
  29. GRB 170705A: Swift-BAT refined analysis
  30. GRB 170705A: Swift-XRT refined Analysis
  31. GRB 170629A: Swift-XRT refined Analysis
  32. GRB 170629A: Fermi GBM observation
  33. GRB 170626A: SAO RAS confirmation of OT fading
  34. GRB 170626A: Swift-XRT refined Analysis
  35. GRB 170626A: Fermi GBM observation
  36. LIGO/Virgo G288732: Fermi GBM Upper Limits for the LIGO Trigger and LAT Candidate
  37. LIGO/Virgo G288732: Kiso/KWFC optical imaging of the possible Fermi/LAT counterpart
  38. GRB 170607B: Fermi GBM detection
  39. LIGO/Virgo G288732: Swift/UVOT follow up of the possible LAT counterpart
  40. LIGO/Virgo G288732: Swift-XRT follow up of the putative LAT counterpart
  41. LIGO/Virgo G288732: INTEGRAL search for a prompt gamma-ray counterpart
  42. LIGO/Virgo G288732: Fermi-LAT detection of a weak candidate
  43. GRB 170607A: Fermi GBM observation
  44. GRB 170607A: Swift-XRT refined Analysis
  45. Swift trigger 755873: Swift BAT and XRT refined analysis
  46. GRB 170522A: confirmation of the X-ray afterglow
  47. GRB 170604A: Swift-XRT refined Analysis
  48. GRB 170604A: optical observations
  49. GRB 170531B: Swift-XRT refined Analysis
  50. GRB 170531A: Swift-XRT refined Analysis
  51. GRB 170524B: Swift-UVOT/XRT Confirmation of Afterglow
  52. GRB 170511A: Fermi GBM observation
  53. LIGO/Virgo G268556: BSA radio observations at 110 MHz
  54. LIGO/Virgo G268556/GW170104: Konus-Wind observations
  55. GRB 170527A: Fermi GBM detection
  56. GRB 170526A: Swift-XRT refined Analysis
  57. GRB 170524B: Swift-XRT observations
  58. GRB 170524A: Swift-XRT refined Analysis
  59. GRB 170522A: Swift-XRT observations
  60. GRB 170522A: Fermi-LAT detection
  61. GRB 170522A: Fermi GBM detection
  62. GRB 170519A: KAIT Optical Observations
  63. GRB 170519A: Swift-XRT refined Analysis
  64. GRB 170519A: optical observations
  65. GRB 170510A: Swift-XRT afterglow detection
  66. GRB 170516A: Swift-XRT refined Analysis
  67. GRB 170514A: Fermi GBM detection
  68. LIGO/Virgo G284239: Konus-Wind observations
  69. GRB 170510A: Swift-XRT observations
  70. GRB 170510A: Fermi GBM observation
  71. GRB 170510A: Fermi-LAT detection
  72. LIGO/Virgo G284239: AstroSat CZTI upper limits
  73. Swift XRT observations of GRB 170424A
  74. LIGO/VIRGO G284239: Fermi GBM Upper Limits
  75. LIGO/Virgo G284239: Fermi-LAT search for a high-energy gamma-ray counterpart
  76. LIGO/Virgo G284239: INTEGRAL search for a prompt gamma-ray counterpart
  77. LIGO/Virgo G284239: Identification of a GW Burst Candidate
  78. GRB 170428A: Swift-XRT refined Analysis
  79. Swift Trigger 750044 is probably a noise fluctuation
  80. GRB 170424A: Fermi GBM detection
  81. GRB 170424A: Fermi-LAT detection
  82. GRB 170423A: Fermi GBM detection
  83. GRB 170419A: Swift-XRT refined Analysis
  84. GRB 170419B: Fermi GBM observation
  85. Swift trigger 748858: Swift BAT, XRT, and UVOT refined analysis
  86. GRB 170409A: Fermi GBM Observation
  87. GRB 170409A: Fermi-LAT detection
  88. GRB 170317A: SAO RAS optical observations
  89. GRB 170405A: Swift-XRT refined Analysis
  90. Trigger 745966: Swift detection of 4U1850-03
  91. GRB 170405A: Fermi-LAT detection
  92. GRB 170405A: Fermi GBM observation
  93. GRB 170403A: Fermi GBM observation
  94. IceCube-170321A: Konus-Wind upper limits
  95. Fermi-LAT Gamma-ray Observations of IceCube-170321
  96. DOAO 1m telescope V, R, I observation of GRB 170317A
  97. IceCube-170321A: Swift-XRT observations
  98. GRB 170330A: Swift-XRT refined Analysis
  99. GRB 170331A: Swift-XRT refined Analysis
  100. GRB 170318B: 15 GHz upper limits from AMI

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