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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"

43953 results found.

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

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