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GCN Circulars

GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. 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"

19090 results found.

  1. GRB 170813A: Swift/UVOT Upper Limits
  2. LIGO/Virgo G297595 ANTARES search
  3. LIGO/Virgo G297595: INTEGRAL search for a prompt gamma-ray counterpart
  4. LIGO/Virgo G297595: IceCube neutrino observations
  5. GRB 170813A: RATIR Optical and NIR Observations
  6. GRB 170810A: AbAO optical upper limit
  7. GRB 170813A: Enhanced Swift-XRT position
  8. GRB 170813A: Swift detection of a burst
  9. LIGO/Virgo G296853: BOOTES-1 and GTC optical observations
  10. GRB 170810A: Swift/UVOT Detection
  11. GRB 170810A: Enhanced Swift-XRT position
  12. GRB 170810A: Swift detection of a burst with a bright optical counterpart
  13. LIGO/Virgo G296853: HAWC follow-up
  14. LIGO/Virgo G296853: Super-AGILE observations
  15. LIGO/Virgo G296853: no INTEGRAL data at the time of the event
  16. LIGO/Virgo G296853: Fermi-LAT search for high-energy gamma-ray counterpart
  17. LIGO/Virgo G296853: Fermi GBM Observations
  18. LIGO/Virgo G296853: Swift/BAT data search
  19. LIGO/Virgo G296853 ANTARES search
  20. GRB 170808B: Fermi GBM observation
  21. IPN Triangulation of GRB 170805A (short)
  22. GRB 170714A: ATCA detection of the radio counterpart
  23. GRB 170808A: MAXI/GSC detection
  24. GRB 170728B: TShAO, SAO RAS and AbAO optical observations
  25. GRB 170804A: LCO Observations
  26. GRB 170804A: Swift/UVOT Detection
  27. GRB 170804A: Swift-XRT refined Analysis
  28. GRB 170804A: Enhanced Swift-XRT position
  29. GRB 170803A: Swift/UVOT Detection
  30. GRB 170804A: Swift detection of a burst with optical counterpart
  31. Swift Trigger 766161 is not a GRB
  32. GRB 170803A: Enhanced Swift-XRT position
  33. GRB 170803A: Swift detection of a burst with an optical counterpart
  34. Swift J181723.1-164300: Swift detection of another pulse of the new Galactic source
  35. GRB 170728B: Swift/UVOT Further Analysis
  36. GRB 170714A: Chandra observations
  37. GRB 170728B: MASTER-IAC first minute short GRB early OT detection
  38. GRB 170728B: COATLI Observations And Confirmation of Fading
  39. GRB 170728B: Swift/UVOT Upper Limits
  40. GRB 170728B iTelescope observation
  41. GRB 170728A: Swift/UVOT Detection
  42. GRB 170728A: LCO observations
  43. GRB 170728B: I-band detection from 1.5m OSN
  44. GRB170714A: XMM observation of the afterglow
  45. GRB 170728B: Enhanced Swift-XRT position
  46. GRB 170728B: Swift-XRT refined Analysis
  47. GRB 170728B: NOT optical afterglow confirmation
  48. GRB 170728B: TNG optical afterglow candidate
  49. GRB 170728B: Swift detection of a short burst
  50. GRB 170728A: Swift-BAT refined analysis
  51. Swift triggers on a new galactic source: Swift J181723.1-164300
  52. GRB 170728A: Enhanced Swift-XRT position
  53. GRB 170728A: Swift detection of a burst
  54. GRB 170726A: Insight-HXMT detection
  55. Trigger 763539 from Swift is probably not astrophysical
  56. GRB 170714A: NOEMA non-detection of the Bastille Day Burst
  57. LIGO/Virgo G275697: LOFAR follow-up
  58. GRB 170710B: Further Swift-XRT observations
  59. GRB 170714A: Swift/UVOT Observations
  60. GRB 170714A: TNG NIR observations
  61. GRB 170714A: z-band afterglow candidate for OSIRIS/GTC
  62. GRB 170714B: Insight-HXMT detection
  63. GRB 170714A: Swift-XRT refined Analysis
  64. GRB 170714A: Enhanced Swift-XRT position
  65. GRB 170714A: Swift detection of a burst
  66. GRB 170708B CALET Gamma-Ray Burst Monitor detection
  67. GRB 170702A CALET Gamma-Ray Burst Monitor detection
  68. GRB 170711A: ISON/Terskol and AbAO optical observations
  69. GRB 170711A: Swift/UVOT Upper Limits
  70. GRB 170711A: RATIR Optical and NIR Observations
  71. GRB 170711A: Enhanced Swift-XRT position
  72. GRB 170711A: Swift detection of a burst
  73. GRB 170705A: TShAO optical observations
  74. GRB 170710B: Swift ToO observations
  75. GRB170710A: Swift/UVOT detection
  76. GRB 170710A: Swift-XRT refined Analysis
  77. GRB 170710A: Gemini-S candidate counterpart
  78. GRB 170710A: Enhanced Swift-XRT position
  79. GRB 170710A: Swift detection of a burst
  80. GRB 170705A: Further RATIR Optical and NIR Observations and Steepening of Fading
  81. GRB 170705A: Insight-HXMT observation
  82. GRB 170705A: ISON/Terskol optical observations
  83. GRB 170705A: Redshift from 10.4m GTC/OSIRIS
  84. GRB 170705A: Swift/UVOT Detection
  85. GRB 170705A: RATIR Optical and NIR Observations
  86. GRB 170705A: Swift-XRT refined Analysis
  87. GRB 170705A: Enhanced Swift-XRT position
  88. GRB 170705A: Swift detection of a burst with an optical counterpart
  89. GRB 170629A: Enhanced Swift-XRT position
  90. GRB 170629A: Swift detection of a burst
  91. IPN Triangulation of GRB 170626B
  92. Konus-Wind observation of GRB 170626A
  93. GRB 170626A: SAO RAS confirmation of OT fading
  94. GRB 170626A: TShAO optical observations
  95. GRB 170626A: OASDG optical observations
  96. GRB 170626A: TNG optical observations
  97. GRB 170626A: Afterglow detection from 1.5m OSN
  98. GRB 170626A: SAO RAS possible OT detection
  99. GRB 170626A: Swift detection of a burst
  100. LIGO/Virgo G288732: Fermi GBM Upper Limits for the LIGO Trigger and LAT Candidate

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