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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"

37713 results found.

  1. GRB 170801A: Insight-HXMT detection
  2. Konus-Wind observation of GRB 170724A
  3. GRB 170714A: ATCA detection of the radio counterpart
  4. GRB 170807A: Swift-BAT refined analysis
  5. GRB 170808A: MAXI/GSC detection
  6. GRB 170805A: Insight-HXMT detection
  7. GRB 170807A: Swift detection of a burst
  8. GRB 170728B: TShAO, SAO RAS and AbAO optical observations
  9. GRB 170803A: Swift/BAT spectral lag results
  10. GRB 170804A: LCO Observations
  11. GRB 170804A: Swift-BAT refined analysis
  12. GRB 170804A: Swift/UVOT Detection
  13. GRB 170804A: Swift-XRT refined Analysis
  14. GRB 170804A: Enhanced Swift-XRT position
  15. GRB 170803A: Swift-BAT refined analysis
  16. GRB 170803A: Swift/UVOT Detection
  17. GRB 170804A: Swift detection of a burst with optical counterpart
  18. Swift Trigger 766161 is not a GRB
  19. GRB 170803A: Swift-XRT refined Analysis
  20. GRB 170803A: Enhanced Swift-XRT position
  21. GRB 170803A: Fermi GBM observation
  22. GRB 170803A: Swift detection of a burst with an optical counterpart
  23. GRB 170802A: Fermi GBM detection
  24. GRB 160814A: Lomonosov BDRG gamma ray discovery
  25. GRB 170728B: time correction to MASTER GCN Circular 21391
  26. GRB 170728B: Swift/UVOT Further Analysis
  27. Konus-Wind observation of GRB 170728B
  28. GRB 170726A: AstroSat CZTI detection
  29. GRB 170714A: Chandra observations
  30. GRB 170728B: VLA radio afterglow detection
  31. GRB 170728B: Optical observations at Crni Vrh
  32. GRB 170728B: BOOTES-2/TELMA optical detection during the extended gamma-ray phase
  33. GRB170730A detecetd by INTEGRAL. Refined analysis
  34. GRB 170728B: MASTER-IAC first minute short GRB early OT detection
  35. IBAS weak Alert nr.7881: possible GRB 170730A
  36. GRB 170728B: COATLI Observations And Confirmation of Fading
  37. GRB 170728B: Swift/UVOT Upper Limits
  38. GRB 170728B iTelescope observation
  39. GRB 170728A: Swift/UVOT Detection
  40. Swift J181723.1-164300: Swift-BAT refined analysis
  41. GRB 170728B, Swift-BAT refined analysis
  42. GRB 170728B: Fermi GBM detection
  43. GRB 170728A: LCO observations
  44. GRB 170728B: I-band detection from 1.5m OSN
  45. GRB 170728B: Fermi-LAT detection
  46. GRB170714A: XMM observation of the afterglow
  47. GRB 170728A: Swift-XRT refined Analysis
  48. GRB 170728B: Enhanced Swift-XRT position
  49. GRB 170728B: Swift-XRT refined Analysis
  50. GRB 170728B: LT afterglow confirmation
  51. GRB 170728B: NOT optical afterglow confirmation
  52. GRB 170728B: position of the TNG optical counterpart
  53. GRB 170728B: TNG optical afterglow candidate
  54. GRB 170728B: Swift detection of a short burst
  55. GRB 170728A: Swift-BAT refined analysis
  56. Swift triggers on a new galactic source: Swift J181723.1-164300
  57. GRB 170728A: Enhanced Swift-XRT position
  58. GRB 170728A: Swift detection of a burst
  59. GRB 170726A: Insight-HXMT detection
  60. GRB 170724A, Swift-BAT refined analysis
  61. GRB 170724A: Swift detection of a burst
  62. Fermi GBM trigger 522477026/170723188 is not a GRB
  63. Fermi GBM trigger 522470841/170723116 is not a GRB
  64. Fermi GBM trigger 522334209/170721535 is not a GRB
  65. GRB170714A: ATCA observation
  66. GRB 170714A: Bastille Day Burst redshift from OSIRIS/GTC
  67. Fermi GBM trigger 522048561/170718229 is not a GRB
  68. GRB 170714A: NOEMA non-detection of the Bastille Day Burst
  69. GRB 170710B: Further Swift-XRT observations
  70. Correction to GCN Circular 21351: GRB 170714A: Swift/UVOT Observations
  71. GRB 170714A: Swift/UVOT Observations
  72. GRB 170714A: TNG NIR observations
  73. Fermi GBM trigger 521905898/170716577 is not a GRB
  74. GRB 170702A: AstroSat CZTI detection
  75. GRB 170714A, Swift-BAT refined analysis
  76. GRB 170714A: z-band afterglow candidate for OSIRIS/GTC
  77. GRB 170714A: Bastille Day Burst: ULGRB or RTDE?
  78. GRB 170714B: Insight-HXMT detection
  79. GRB 170714A: Swift-XRT refined Analysis
  80. Fermi GBM Detection of possible burst from AXP 4U 0142+61
  81. GRB 170714A: Enhanced Swift-XRT position
  82. GRB 170714A: Swift detection of a burst
  83. GRB 170712A: AstroSat CZTI detection
  84. Correction to GCN Circular 21337: GRB 170710D CALET Gamma-Ray Burst Monitor detection
  85. GRB 170710D CALET Gamma-Ray Burst Monitor detection
  86. GRB 170708B CALET Gamma-Ray Burst Monitor detection
  87. GRB 170703A CALET Gamma-Ray Burst Monitor detection
  88. GRB 170702A CALET Gamma-Ray Burst Monitor detection
  89. GRB 170711A: ISON/Terskol and AbAO optical observations
  90. GRB 170712A: Insight-HXMT detection
  91. GRB 170711A: Swift-BAT refined analysis
  92. Konus-Wind observation of GRB 170708A
  93. GRB 170711A: Swift/UVOT Upper Limits
  94. GRB 170711A: RATIR Optical and NIR Observations
  95. GRB 170705A: AstroSat CZTI detection
  96. GRB 170710C: a long GRB detected by INTEGRAL
  97. GRB 170711A: Swift-XRT refined Analysis
  98. GRB 170711A: Fermi GBM observation
  99. GRB 170711A: Enhanced Swift-XRT position
  100. GRB 170711A: Prompt enhanced Swift-XRT position

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