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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"

11519 results found.

  1. GRB 160521B: Swift-XRT afterglow detection
  2. Konus-Wind observation of GRB 160521B
  3. Correction - Fermi/GBM trigger 160523919 is a GRB
  4. GRB 160521B: Theoretical estimate of the redshift and urgent need for further x-ray observations
  5. The nature of the Fermi/GBM trigger 160523919 is unknown.
  6. GRB 160521B: Swift-XRT observations
  7. GRB 160521B: Swift ToO observations
  8. GRB 160521B: Fermi-LAT detection
  9. GRB 160521B: Fermi GBM detection
  10. GRB 160519A: Fermi GBM detection
  11. Konus-Wind observation of a bright burst from SGR 1935+2154
  12. FERMI GBM bursts from the magnetar SGR 1935+2154
  13. SGR 1935+2154: AbAO optical upper limit
  14. Fermi GBM triggers of SGR 1935+2154
  15. Fermi GBM trigger 485205628 /160517806 is not a GRB
  16. Fermi GBM trigger 485124591/160516868 is not a GRB
  17. Fermi GBM trigger 484906918/160514349 is not a GRB
  18. GRB 160509A: Further VLA Observations
  19. Interplanetary Network Search for IceCube 160427A
  20. GRB 160509A: non-observation of VHE emission with HAWC
  21. GRB 160509A: TLS Tautenburg Afterglow Detection
  22. GRB 160509A Gemini North redshift
  23. Fermi GBM trigger 484574960/160510506 is not a GRB
  24. Konus-Wind observation of GRB 160509A
  25. GRB 160509A: DCT Imaging / Afterglow Confirmation
  26. GRB 160509A: VLA Detection
  27. GRB 160509A: Fermi-LAT refined analysis
  28. GRB 160509A: Fermi GBM Detection
  29. GRB 160509A Gemini North candidate afterglow
  30. GRB 160509A: Swift-XRT afterglow detection
  31. GRB 160509A: Preliminary XRT positon
  32. GRB 160509A: Tiled Swift observations
  33. GRB 160509A: Fermi-LAT prompt detection of a very bright burst
  34. GRB 160503A: Fermi GBM observation
  35. GRB 160503A: Fermi-LAT detection
  36. IceCube-160427A: Fermi GBM Observations
  37. Fermi/LAT search for counterpart to the IceCube event 67093193 (run 127853)
  38. GRB 160422A: XRT Afterglow Confirmation
  39. GRB 160422A: GROND NIR afterglow detection
  40. GRB 160422A: CALET Gamma-Ray Burst Monitor detection
  41. Konus-Wind observation of GRB 160424A
  42. GRB 160424A: Fermi GBM observation
  43. GRB 160422A: Swift-XRT afterglow detection
  44. GRB 160422A: Fermi GBM observation
  45. GRB 160422A: Swift ToO observations
  46. GRB 160422A: Fermi-LAT Detection
  47. GRB 160419A: Fermi GBM detection
  48. Fermi GBM trigger 482632364/160418023 is not a GRB
  49. GRB 160408A: CALET Gamma-Ray Burst Monitor detection
  50. GRB 160411A: Fermi GBM detection
  51. GRB 160408A: Fermi GBM detection
  52. GRB 160406A: Fermi GBM observation
  53. GRB 160408A: Swift-BAT refined analysis
  54. IPN Triangulation of GRB 160406A (short/hard)
  55. Konus-Wind observation of GRB 160325A
  56. GRB 160325A: GROND Upper Limits
  57. GRB 160325A: Fermi-LAT detection
  58. LIGO/Virgo G211117: CALET GBM Observations
  59. GRB 160325A: Fermi GBM detection
  60. Fermi Gamma-ray Burst Monitor trigger 160323546 is not a GRB
  61. GRB 160316A: CALET Gamma-Ray Burst Monitor detection
  62. GRB 160310A: Terskol 2-m observations
  63. IPN Triangulation of GRB 160310A
  64. GRB 160310A: A further Swift-XRT observation, no afterglow detected
  65. GRB 160314B: Fermi GBM observation
  66. GRB 160314B: Fermi-LAT detection
  67. Fermi GBM trigger 479509107/160312874 is not a GRB
  68. Konus-Wind observation of GRB 160310A (possible ultra-long GRB?)
  69. GRB 160310A: RATIR Optical and NIR Observations
  70. GRB 160310A: Swift-XRT observations
  71. GRB 160310A: Fermi GBM observation
  72. GRB 160310A: Swift ToO observations
  73. GRB 160310A: Fermi-LAT detection
  74. GRB 160227B: Fermi GBM detection
  75. GRB 160225B: Fermi GBM detection
  76. IPN Triangulation of GRB 160225B
  77. GRB 160225.81/FERMI Trigg 478121069: MASTER OT J095503.19-355149.4 follow up observations
  78. GRB 160225.81/FERMI Trigg 478121069: MASTER OT J095503.19-355149.4 detection
  79. Fermi GBM trigger 478156376/16022621 is not a GRB
  80. GRB 160223A: AbAO optical observations
  81. Konus-Wind observation of GRB 160219A
  82. Fermi GBM trigger 477460274/160218161 is not a GRB
  83. Fermi GBM trigger 477985003/160224234 is not a GRB
  84. GRB 160223B: Khureltogot optical observations
  85. GRB 160223A: Fermi GBM observation
  86. GRB 160223B: LCOGT-FTN optical observations
  87. GRB 160223B: Fermi GBM observation
  88. GRB 160221A: Fermi GBM observation
  89. GRB 160219A: Fermi GBM detection
  90. GRB 160220A: nIR observations at AAT
  91. IPN Triangulation of GRB 160219A (short/hard)
  92. GRB 160220A: Fermi GBM observation
  93. LIGO/Virgo G184098: MASTER arhival results
  94. Konus-Wind observation of GRB 160216A (and GRB 160216B)
  95. Fermi GBM trigger 477254668/160215781 is not a GRB
  96. GRB 160206B: Fermi GBM detection
  97. GRB 160206B: iPTF P48 Observations and Optical Transient Candidates
  98. Fermi GBM trigger 475675010/160128498 is not a GRB
  99. GRB 160118A CALET Gamma-Ray Burst Monitor detection
  100. Konus-Wind observation of GRB 160113A

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