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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"

11546 results found.

  1. GRB 150530A: Fermi GBM observation
  2. Fermi GBM trigger 150529948 is not a GRB
  3. Konus-Wind observation of GRB 150527A
  4. GRB 150527A: Fermi GBM observation
  5. GRB 150523A: Suzaku WAM observation of the prompt emission
  6. GRB 150523A: Swift ToO observations
  7. GRB 150513A: request for X-ray follow up
  8. Konus-Wind observation of GRB 150523A
  9. GRB 150523A: LCOGT Cerro-Tololo optical afterglow candidate
  10. GRB 150523A Swift-XRT afterglow detection
  11. GRB 150523B: Swift ToO observations
  12. GRB 150523A: Fermi-LAT detection
  13. GRB 150523A: Fermi GBM detection
  14. GRB 150518A: MASTER-net before, early and after optical stereoscopic observations with possible MP discovery inside MAXI error box
  15. Konus-Wind observation of GRB 150514A
  16. GRB 150514A: GROND Bright Afterglow Confirmation
  17. GRB 150514A: Fermi GBM Detection
  18. GRB 150514A: Swift-XRT afterglow detection
  19. GRB 150514A: Swift ToO observations
  20. GRB 150514A: Fermi-LAT detection
  21. GRB 150512A: CrAO optical observations
  22. GRB 150513A: Fermi GBM detection
  23. GRB 150513A: Fermi-LAT detection
  24. GRB 150512A: Fermi GBM detection
  25. GRB 150512A: iPTF Optical Observations
  26. Konus-Wind observation of GRB 150510A
  27. GRB 150510A: Fermi GBM detection
  28. GRB 150510A: Fermi-LAT Refined Analysis
  29. GRB 150510A: Fermi-LAT detection
  30. Konus-Wind observation of GRB 150430A
  31. GRB 150430A: Fermi GBM Detection
  32. GRB 150426A: Fermi GBM detection
  33. Fermi GBM trigger 150424722 is not a GRB
  34. GRB 150424B: Fermi GBM detection
  35. GRB 150422A: Fermi GBM detection
  36. GRB 150416A: Fermi GBM detection
  37. GRB 150416A: Fermi-LAT detection
  38. Konus-Wind observation of a bright burst from SGR 1935+2154
  39. GRB 150404A: Fermi GBM detection
  40. Konus-Wind observation of GRB 150403A
  41. Fermi trigger 449861706: MASTER-SAAO possible candidate to OT of Short GRB
  42. GRB 150403A: Fermi GBM Detection
  43. GRB 150403A: Fermi-LAT detection
  44. Konus-Wind observation of GRB 150330A
  45. IPN Triangulation of GRB 150330A (long/very intense)
  46. GRB 150330A: Fermi GBM detection
  47. Konus-Wind observation of GRB 150323B
  48. GRB150323C: Fermi GBM detection
  49. GRB 150323B: Fermi GBM observation
  50. GRB 150323B detected in ground analysis of Swift-BAT data
  51. Fermi GBM trigger 150319666 is not a GRB
  52. Konus-Wind observation of GRB 150314A
  53. GRB 150314A: Redshift from OSIRIS/GTC
  54. GRB 150314A: Fermi GBM observation
  55. GRB 150314A: Fermi-LAT detection
  56. Fermi GBM trigger 150312827 is not a GRB
  57. Fermi GBM trigger 150311331 is not a GRB
  58. GRB 150309A: Fermi GBM detection
  59. GRB 150309A: MASTER prompt optical observation
  60. Fermi GBM trigger 150307942 is not a GRB
  61. Fermi GBM trigger 150305751 is not a GRB
  62. GRB 150301B: LCOGT-Sutherland observations
  63. GRB 150301B: Fermi GBM detection
  64. GRB 150301A: Swift-BAT refined analysis
  65. GRB 150301A: Fermi GBM observation
  66. Fermi GBM Observations of Magnetar 4U 0142+61
  67. GRB 150220A: Fermi GBM observation
  68. IPN Triangulation of GRB 150220A
  69. Fermi GBM Observations of SGR 1935+2154
  70. Fermi GBM trigger 150223068 is not a GRB
  71. Fermi GBM trigger 150220229 is not a GRB
  72. GRB 150219A: Fermi GBM observation
  73. GRB 150213A: Fermi GBM detection
  74. GRB 150210A: Swift-XRT observations
  75. GRB 150210A: MASTER SN detection during LAT error box inspection
  76. GRB 150210A: Tiled Swift observations
  77. Konus-Wind observation of GRB 150210A
  78. IPN Triangulation of GRB 150210A
  79. GRB 150210A: Fermi-LAT detection
  80. GRB 150210A: Fermi GBM detection
  81. Konus-Wind observation of GRB 150202B
  82. GRB 150206B: Fermi GBM detection
  83. GRB 150206B: iPTF Optical Observations
  84. GRB 150204A: LCOGT-Sutherland and Siding Springs observations
  85. GRB 150204A: Fermi GBM detection
  86. GRB 150202B: Swift XRT/UVOT observations
  87. GRB 150204A found in ground analysis of Swift-BAT data
  88. IPN Triangulation of GRB 150202B
  89. GRB 150202B: Tiled Swift observations
  90. Fermi GBM trigger 150202624 is not a GRB
  91. GRB 150203A: Fermi GBM observation
  92. GRB 150202B: Fermi GBM detection
  93. GRB 150202B: Fermi-LAT detection
  94. Konus-Wind observation of GRB 150201A
  95. GRB 150201A: Fermi GBM observation
  96. GRB 150128A: MASTER OT detction during inspection
  97. GRB 150127B: Fermi GBM detection
  98. IPN Triangulation of GRB 150127B
  99. IPN Triangulation of GRB 150127A
  100. Konus-Wind observation of GRB 150126A reveals its ultra-long nature

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Download all Circulars as a .tar.gz archive (updated once a day):
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