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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"
  1. LIGO/Virgo G297595: IceCube neutrino observations
  2. LIGO/Virgo G297595: Identification of a GW Binary Merger Candidate
  3. GRB 170813A: Swift-BAT refined analysis
  4. GRB 170813A: RATIR Optical and NIR Observations
  5. GRB 170810A: AbAO optical upper limit
  6. GRB 170813A: Swift-XRT refined Analysis
  7. GRB 170813A: Enhanced Swift-XRT position
  8. GRB 170813A: Swift detection of a burst
  9. LIGO/Virgo G296853: Liverpool Telescope classification of MASTER OT J013646.48-140323.5
  10. GRB 170728B: 15 GHz upper limits from AMI
  11. GRB 170728A: 15 GHz upper limits from AMI
  12. GRB 170714A: 15 GHz upper limits from AMI
  13. GRB 170711A: 15 GHz upper limits from AMI
  14. GRB 170710C: 15 GHz upper limits from AMI
  15. GRB 170710B: 15 GHz upper limits from AMI
  16. GRB 170626A: 15 GHz upper limits from AMI
  17. LIGO/Virgo G296853: BOOTES-1 and GTC optical observations
  18. GRB 170810A: Swift-BAT refined analysis
  19. LIGO/Virgo G296853: Insight-HXMT observations
  20. LIGO/Virgo G296853 : MAXI/GSC observations
  21. GRB 170810A: Swift-XRT refined Analysis
  22. GRB 170810A: Swift/UVOT Detection
  23. GRB 170810A: Fermi GBM observation
  24. GRB 170810A: Fermi-LAT detection
  25. GRB 170810A: Enhanced Swift-XRT position
  26. GRB 170810A: Swift detection of a burst with a bright optical counterpart
  27. GRB 170810A: MASTER-NET very bright OT detection
  28. LIGO/Virgo G296853: HAWC follow-up
  29. Konus-Wind observation of GRB 170808B
  30. LIGO/Virgo G296853: Super-AGILE observations
  31. LIGO/Virgo G296853: MASTER SN detection near center error-area
  32. GRB 170805B: Insight-HXMT observation
  33. GRB 170803B: Insight-HXMT detection
  34. Konus-Wind observation of GRB 170805B
  35. GMRT upper limit on the radio afterglow of GRB 170728B
  36. LIGO/Virgo G296853: no INTEGRAL data at the time of the event
  37. LIGO/Virgo G296853: Fermi-LAT search for high-energy gamma-ray counterpart
  38. LIGO/Virgo G296853: Fermi GBM Observations
  39. LIGO/Virgo G296853: AGILE GRID observations
  40. LIGO/Virgo G296853: Swift/BAT data search
  41. LIGO/Virgo G296853: MASTER follow up observations
  42. LIGO/Virgo G296853: AGILE MCAL observations
  43. LIGO/Virgo G296853 ANTARES search
  44. LIGO/Virgo G296853: IceCube neutrino observations
  45. LIGO/Virgo G296853: Identification of a GW Binary Merger Candidate
  46. GRB 170808B: Fermi LAT Detection
  47. GRB 170808B: Fermi GBM observation
  48. IPN Triangulation of GRB 170805B (short/hard)
  49. IPN Triangulation of GRB 170805A (short)
  50. GRB 170801A: Insight-HXMT detection
  51. Konus-Wind observation of GRB 170724A
  52. GRB 170714A: ATCA detection of the radio counterpart
  53. GRB 170807A: Swift-BAT refined analysis
  54. GRB 170808A: MAXI/GSC detection
  55. GRB 170805A: Insight-HXMT detection
  56. GRB 170807A: Swift detection of a burst
  57. GRB 170728B: TShAO, SAO RAS and AbAO optical observations
  58. GRB 170803A: Swift/BAT spectral lag results
  59. GRB 170804A: LCO Observations
  60. GRB 170804A: Swift-BAT refined analysis
  61. GRB 170804A: Swift/UVOT Detection
  62. GRB 170804A: Swift-XRT refined Analysis
  63. GRB 170804A: Enhanced Swift-XRT position
  64. GRB 170803A: Swift-BAT refined analysis
  65. GRB 170803A: Swift/UVOT Detection
  66. GRB 170804A: Swift detection of a burst with optical counterpart
  67. Swift Trigger 766161 is not a GRB
  68. GRB 170803A: Swift-XRT refined Analysis
  69. GRB 170803A: Enhanced Swift-XRT position
  70. GRB 170803A: Fermi GBM observation
  71. GRB 170803A: Swift detection of a burst with an optical counterpart
  72. GRB 170802A: Fermi GBM detection
  73. Swift Trigger 765783 is not an astrophysical event.
  74. GRB 160814A: Lomonosov BDRG gamma ray discovery
  75. GRB 170728B: time correction to MASTER GCN Circular 21391
  76. Swift J181723.1-164300: Swift detection of another pulse of the new Galactic source
  77. GRB 170728B: Swift/UVOT Further Analysis
  78. Konus-Wind observation of GRB 170728B
  79. GRB 170726A: AstroSat CZTI detection
  80. GRB 170714A: Chandra observations
  81. GRB 170728B: VLA radio afterglow detection
  82. GRB 170728B: Optical observations at Crni Vrh
  83. GRB 170728B: BOOTES-2/TELMA optical detection during the extended gamma-ray phase
  84. GRB170730A detecetd by INTEGRAL. Refined analysis
  85. GRB 170728B: MASTER-IAC first minute short GRB early OT detection
  86. IBAS weak Alert nr.7881: possible GRB 170730A
  87. GRB 170728B: COATLI Observations And Confirmation of Fading
  88. GRB 170728B: Swift/UVOT Upper Limits
  89. GRB 170728B iTelescope observation
  90. GRB 170728A: Swift/UVOT Detection
  91. Swift J181723.1-164300: Swift-BAT refined analysis
  92. GRB 170728B, Swift-BAT refined analysis
  93. GRB 170728B: Fermi GBM detection
  94. GRB 170728A: LCO observations
  95. GRB 170728B: I-band detection from 1.5m OSN
  96. GRB 170728B: Fermi-LAT detection
  97. GRB170714A: XMM observation of the afterglow
  98. GRB 170728A: Swift-XRT refined Analysis
  99. GRB 170728B: Enhanced Swift-XRT position
  100. GRB 170728B: Swift-XRT refined Analysis

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