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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"

11511 results found.

  1. GRB 150817A: Fermi GBM observation
  2. Fermi GBM Trigger 150815694 is not a GRB
  3. GBM Trigger 150813665 is not a GRB
  4. Konus-Wind observation of GRB 150811B
  5. IPN Triangulation of GRB 150811B
  6. GRB 150811B: Fermi GBM detection
  7. GRB 150810A: Fermi GBM detection
  8. Fermi GBM GRB Trigger 460608875: iPTF P48 Observations
  9. Fermi GBM trigger 150807969 is not a GRB
  10. Fermi GBM trigger 150806450 is not a GRB
  11. Fermi GBM trigger 150805556 is not a GRB
  12. Fermi GBM triggers 150730606 150731173 and 150801590 are not due to GRBs
  13. Fermi GBM GRB Trigger 458852670: iPTF P48 Observations
  14. GRB 150721A (Fermi GBM Trigger 459150552): iPTF P48 Observations
  15. GRB 150724B: Swift-XRT afterglow detection
  16. GRB 150727A: Fermi GBM detection
  17. GRB 150724B: Continued RATIR Optical Observations
  18. GRB 150724B: MASTER upper limit
  19. GRB 150724B: Swift/UVOT Detection
  20. Konus-Wind observation of GRB 150724B
  21. GRB 150724B: Swift-XRT observations
  22. GRB 150724B: Swift ToO observations
  23. GRB 150724B: Fermi GBM detection
  24. GRB 150724B: Fermi-LAT detection
  25. Fermi GBM trigger 150725291 is not a GRB
  26. GRB 150721A: Fermi GBM detection
  27. Fermi GBM triggers bn150715759 and bn150715817 are not due to GRBs
  28. Fermi Gamma-ray Burst Monitor triggers that are not GRBs
  29. Fermi GBM trigger 458312518/150711543 is not a GRB
  30. GRB 150711A: Fermi GBM detection
  31. MASTER OT Detection during Fermi Trigger 458235025 inspection
  32. Fermi Gamma-ray Burst Monitor Trigger bn150705731 is not a GRB
  33. Konus-Wind observation of GRB 150702A
  34. GRB 150702A: Fermi GBM detection
  35. IPN Triangulation of GRB 150702A
  36. GRB 150702A: MASTER-SAAO inspection
  37. GRB 150702A: Swift-XRT observations
  38. GRB 150702A: Swift ToO observations
  39. GRB 150702A: Fermi-LAT detection
  40. Fermi GBM Observations is no longer triggerin on V404 Cyg
  41. Fermi Gamma-ray Burst Monitor Trigger 150626873 is not a GRB
  42. Fermi Gamma-ray Burst Monitor Trigger bn150628857 is not a GRB
  43. Fermi Gamma-ray Burst Monitor trigger bn150629779 is not a GRB
  44. Konus-Wind observation of GRB 150627A
  45. V404 Cyg activity (Swift, Fermi, INTGRAL, KONUS, MAXI detection): optical observations in TSHAO, Khureltogot, and AAO
  46. GRB 150627A: Swift/UVOT Detection
  47. GRB 150627A: Swift-XRT afterglow detection
  48. GRB 150627A: Fermi GBM observation
  49. GRB 150627A: Swift ToO observations
  50. GRB 150627A: Fermi-LAT detection
  51. Fermi Gamma-ray Burst Monitor triggers that are not GRBs
  52. Fermi Gamma-ray Burst Monitor triggers bn150622899 and bn150623043 are not GRBs
  53. V404 Cyg: Fermi GBM observations
  54. V404 Cyg outburst (Swift trigger 643949 ): TSHAO optical observations
  55. Konus-Wind observation of Galactic transient V404 Cyg in outburst
  56. Fermi GBM trigger 150616734 is not a GRB
  57. Fermi GBM trigger 150616594 is not a GRB
  58. Fermi Gamma-ray Burst Monitor triggers bn150615791 and bn150615798 are not GRBs
  59. Fermi GBM trigger 150615574 is not a GRB
  60. Fermi GBM trigger 150613619 is not a GRB
  61. Fermi GBM trigger 150612648 is not a GRB
  62. Fermi Gamma-ray Burst Monitor trigger 455474712 / 150608698 is not a GRB
  63. Konus-Wind observation of GRB 150607A
  64. GRB 150607A: Fermi GBM Detection
  65. Konus-Wind observation of GRB 150530A
  66. GRB 150530A: Fermi GBM observation
  67. Fermi GBM trigger 150529948 is not a GRB
  68. Konus-Wind observation of GRB 150527A
  69. GRB 150527A: Fermi GBM observation
  70. GRB 150523A: Suzaku WAM observation of the prompt emission
  71. GRB 150523A: Swift ToO observations
  72. GRB 150513A: request for X-ray follow up
  73. Konus-Wind observation of GRB 150523A
  74. GRB 150523A: LCOGT Cerro-Tololo optical afterglow candidate
  75. GRB 150523A Swift-XRT afterglow detection
  76. GRB 150523B: Swift ToO observations
  77. GRB 150523A: Fermi-LAT detection
  78. GRB 150523A: Fermi GBM detection
  79. GRB 150518A: MASTER-net before, early and after optical stereoscopic observations with possible MP discovery inside MAXI error box
  80. Konus-Wind observation of GRB 150514A
  81. GRB 150514A: GROND Bright Afterglow Confirmation
  82. GRB 150514A: Fermi GBM Detection
  83. GRB 150514A: Swift-XRT afterglow detection
  84. GRB 150514A: Swift ToO observations
  85. GRB 150514A: Fermi-LAT detection
  86. GRB 150512A: CrAO optical observations
  87. GRB 150513A: Fermi GBM detection
  88. GRB 150513A: Fermi-LAT detection
  89. GRB 150512A: Fermi GBM detection
  90. GRB 150512A: iPTF Optical Observations
  91. Konus-Wind observation of GRB 150510A
  92. GRB 150510A: Fermi GBM detection
  93. GRB 150510A: Fermi-LAT Refined Analysis
  94. GRB 150510A: Fermi-LAT detection
  95. Konus-Wind observation of GRB 150430A
  96. GRB 150430A: Fermi GBM Detection
  97. GRB 150426A: Fermi GBM detection
  98. Fermi GBM trigger 150424722 is not a GRB
  99. GRB 150424B: Fermi GBM detection
  100. GRB 150422A: Fermi GBM detection

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