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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"

36143 results found.

  1. GRB 170822A: Enhanced Swift-XRT position
  2. GRB 170822A:BOOTES-5/JGT optical afterglow candidate
  3. LIGO/Virgo G298048: CALET Observations
  4. GRB 170822A: Swift detection of a burst
  5. Konus-Wind observation of GRB 170816A
  6. LIGO/Virgo G298389: Swift/BAT data search
  7. LIGO/Virgo G298048: optical observations of CHILESCOPE observatory
  8. GRB 170816A CALET Gamma-Ray Burst Monitor detection
  9. GRB 170817B: Insight-HXMT observation
  10. LIGO/Virgo G298048: optical spectral energy distribution of SSS17a
  11. GRB 170818A: Fermi GBM detection
  12. LIGO/VIRGO G298048: Swift UVOT detection and XRT upper limits
  13. LIGO/VIRGO G298048: The Potential Optical Counterpart in NGC 4993 Has Afterglow-Like Colors
  14. GRB 170817B: Fermi GBM detection
  15. LIGO/Virgo G298048 - Update on Fermi/GBM GRB 170817A Analysis
  16. LIGO/Virgo G298048: Swift/BAT data search
  17. GRB 170817A: Fermi GBM detection
  18. LIGO/Virgo G298048: Insight-HXMT observations
  19. IPN Triangulation of GRB 170816A (short/hard)
  20. LIGO/Virgo G298048: IPN triangulation of Fermi/GBM trigger 524666471/170817529
  21. LIGO/Virgo G298048: COINCIDENT IceCube neutrino candidate with Fermi GBM trigger 524666471/170817529
  22. LIGO/Virgo G298048: Fermi GBM trigger 170817.529 and LIGO single IFO trigger
  23. GRB 170816A: Fermi GBM detection
  24. GRB 170805A: AstroSat CZTI detection
  25. LIGO/Virgo G297595: Konus-Wind observations
  26. GRB 170810A: VLA Detection
  27. GRB 170813A: Fermi GBM observation
  28. Fermi GBM trigger 524493492/170815526 is not a GRB
  29. LIGO/Virgo G297595: Pan-STARRS coverage and transients over the first 5hrs
  30. LIGO/Virgo G297595: Insight-HXMT observations
  31. LIGO/Virgo G297595: Swift/BAT data search
  32. GRB 170813A: Swift/UVOT Upper Limits
  33. GRB 170813A: Swift-BAT refined analysis
  34. GRB 170813A: RATIR Optical and NIR Observations
  35. GRB 170810A: AbAO optical upper limit
  36. GRB 170813A: Swift-XRT refined Analysis
  37. GRB 170813A: Enhanced Swift-XRT position
  38. GRB 170813A: Swift detection of a burst
  39. GRB 170728B: 15 GHz upper limits from AMI
  40. GRB 170728A: 15 GHz upper limits from AMI
  41. GRB 170714A: 15 GHz upper limits from AMI
  42. GRB 170711A: 15 GHz upper limits from AMI
  43. GRB 170710C: 15 GHz upper limits from AMI
  44. GRB 170710B: 15 GHz upper limits from AMI
  45. GRB 170626A: 15 GHz upper limits from AMI
  46. GRB 170810A: Swift-BAT refined analysis
  47. LIGO/Virgo G296853: Insight-HXMT observations
  48. GRB 170810A: Swift-XRT refined Analysis
  49. GRB 170810A: Swift/UVOT Detection
  50. GRB 170810A: Fermi GBM observation
  51. GRB 170810A: Fermi-LAT detection
  52. GRB 170810A: Enhanced Swift-XRT position
  53. GRB 170810A: Swift detection of a burst with a bright optical counterpart
  54. GRB 170810A: MASTER-NET very bright OT detection
  55. Konus-Wind observation of GRB 170808B
  56. GRB 170805B: Insight-HXMT observation
  57. GRB 170803B: Insight-HXMT detection
  58. Konus-Wind observation of GRB 170805B
  59. GMRT upper limit on the radio afterglow of GRB 170728B
  60. LIGO/Virgo G296853: no INTEGRAL data at the time of the event
  61. LIGO/Virgo G296853: Fermi GBM Observations
  62. LIGO/Virgo G296853: Swift/BAT data search
  63. GRB 170808B: Fermi LAT Detection
  64. GRB 170808B: Fermi GBM observation
  65. IPN Triangulation of GRB 170805B (short/hard)
  66. IPN Triangulation of GRB 170805A (short)
  67. GRB 170801A: Insight-HXMT detection
  68. Konus-Wind observation of GRB 170724A
  69. GRB 170714A: ATCA detection of the radio counterpart
  70. GRB 170807A: Swift-BAT refined analysis
  71. GRB 170808A: MAXI/GSC detection
  72. GRB 170805A: Insight-HXMT detection
  73. GRB 170807A: Swift detection of a burst
  74. GRB 170728B: TShAO, SAO RAS and AbAO optical observations
  75. GRB 170803A: Swift/BAT spectral lag results
  76. GRB 170804A: LCO Observations
  77. GRB 170804A: Swift-BAT refined analysis
  78. GRB 170804A: Swift/UVOT Detection
  79. GRB 170804A: Swift-XRT refined Analysis
  80. GRB 170804A: Enhanced Swift-XRT position
  81. GRB 170803A: Swift-BAT refined analysis
  82. GRB 170803A: Swift/UVOT Detection
  83. GRB 170804A: Swift detection of a burst with optical counterpart
  84. Swift Trigger 766161 is not a GRB
  85. GRB 170803A: Swift-XRT refined Analysis
  86. GRB 170803A: Enhanced Swift-XRT position
  87. GRB 170803A: Fermi GBM observation
  88. GRB 170803A: Swift detection of a burst with an optical counterpart
  89. GRB 170802A: Fermi GBM detection
  90. GRB 160814A: Lomonosov BDRG gamma ray discovery
  91. GRB 170728B: time correction to MASTER GCN Circular 21391
  92. GRB 170728B: Swift/UVOT Further Analysis
  93. Konus-Wind observation of GRB 170728B
  94. GRB 170726A: AstroSat CZTI detection
  95. GRB 170714A: Chandra observations
  96. GRB 170728B: VLA radio afterglow detection
  97. GRB 170728B: Optical observations at Crni Vrh
  98. GRB 170728B: BOOTES-2/TELMA optical detection during the extended gamma-ray phase
  99. GRB170730A detecetd by INTEGRAL. Refined analysis
  100. GRB 170728B: MASTER-IAC first minute short GRB early OT detection

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