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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"

11528 results found.

  1. GRB 150902A: Fermi GBM detection
  2. GRB 150902A: Fermi-LAT detection
  3. GRB 150831B: MASTER-IAC early optical observations
  4. GRB 150831B: Fermi GBM detection
  5. Fermi GBM trigger 150829183 is not a GRB
  6. Fermi GBM trigger 150828520 is not a GRB
  7. Fermi GBM trigger 150827524 is not a GRB
  8. Fermi GBM trigger 150826536 is not a GRB
  9. Konus-Wind observation of GRB 150824A
  10. IPN Triangulation of GRB 150824A
  11. GRB 150824A: Fermi GBM detection
  12. Konus-Wind observation of GRB 150821A
  13. GRB 150821A: Fermi GBM detection
  14. Konus-Wind observation of GRB 150819B
  15. GRB 150819B: Fermi GBM detection
  16. IPN Triangulation of GRB 150819B (short / very intense)
  17. MASTER OT inside bright ESO240-010 galaxy detection during FERMI trigger GRB150816.83 inspection
  18. GRB 150817A: Fermi GBM observation
  19. Fermi GBM Trigger 150815694 is not a GRB
  20. GBM Trigger 150813665 is not a GRB
  21. Konus-Wind observation of GRB 150811B
  22. IPN Triangulation of GRB 150811B
  23. GRB 150811B: Fermi GBM detection
  24. GRB 150810A: Fermi GBM detection
  25. Fermi GBM GRB Trigger 460608875: iPTF P48 Observations
  26. Fermi GBM trigger 150807969 is not a GRB
  27. Fermi GBM trigger 150806450 is not a GRB
  28. Fermi GBM trigger 150805556 is not a GRB
  29. Fermi GBM triggers 150730606 150731173 and 150801590 are not due to GRBs
  30. Fermi GBM GRB Trigger 458852670: iPTF P48 Observations
  31. GRB 150721A (Fermi GBM Trigger 459150552): iPTF P48 Observations
  32. GRB 150724B: Swift-XRT afterglow detection
  33. GRB 150727A: Fermi GBM detection
  34. GRB 150724B: Continued RATIR Optical Observations
  35. GRB 150724B: MASTER upper limit
  36. GRB 150724B: Swift/UVOT Detection
  37. Konus-Wind observation of GRB 150724B
  38. GRB 150724B: Swift-XRT observations
  39. GRB 150724B: Swift ToO observations
  40. GRB 150724B: Fermi GBM detection
  41. GRB 150724B: Fermi-LAT detection
  42. Fermi GBM trigger 150725291 is not a GRB
  43. GRB 150721A: Fermi GBM detection
  44. Fermi GBM triggers bn150715759 and bn150715817 are not due to GRBs
  45. Fermi Gamma-ray Burst Monitor triggers that are not GRBs
  46. Fermi GBM trigger 458312518/150711543 is not a GRB
  47. GRB 150711A: Fermi GBM detection
  48. MASTER OT Detection during Fermi Trigger 458235025 inspection
  49. Fermi Gamma-ray Burst Monitor Trigger bn150705731 is not a GRB
  50. Konus-Wind observation of GRB 150702A
  51. GRB 150702A: Fermi GBM detection
  52. IPN Triangulation of GRB 150702A
  53. GRB 150702A: MASTER-SAAO inspection
  54. GRB 150702A: Swift-XRT observations
  55. GRB 150702A: Swift ToO observations
  56. GRB 150702A: Fermi-LAT detection
  57. Fermi GBM Observations is no longer triggerin on V404 Cyg
  58. Fermi Gamma-ray Burst Monitor Trigger 150626873 is not a GRB
  59. Fermi Gamma-ray Burst Monitor Trigger bn150628857 is not a GRB
  60. Fermi Gamma-ray Burst Monitor trigger bn150629779 is not a GRB
  61. Konus-Wind observation of GRB 150627A
  62. V404 Cyg activity (Swift, Fermi, INTGRAL, KONUS, MAXI detection): optical observations in TSHAO, Khureltogot, and AAO
  63. GRB 150627A: Swift/UVOT Detection
  64. GRB 150627A: Swift-XRT afterglow detection
  65. GRB 150627A: Fermi GBM observation
  66. GRB 150627A: Swift ToO observations
  67. GRB 150627A: Fermi-LAT detection
  68. Fermi Gamma-ray Burst Monitor triggers that are not GRBs
  69. Fermi Gamma-ray Burst Monitor triggers bn150622899 and bn150623043 are not GRBs
  70. V404 Cyg: Fermi GBM observations
  71. V404 Cyg outburst (Swift trigger 643949 ): TSHAO optical observations
  72. Konus-Wind observation of Galactic transient V404 Cyg in outburst
  73. Fermi GBM trigger 150616734 is not a GRB
  74. Fermi GBM trigger 150616594 is not a GRB
  75. Fermi Gamma-ray Burst Monitor triggers bn150615791 and bn150615798 are not GRBs
  76. Fermi GBM trigger 150615574 is not a GRB
  77. Fermi GBM trigger 150613619 is not a GRB
  78. Fermi GBM trigger 150612648 is not a GRB
  79. Fermi Gamma-ray Burst Monitor trigger 455474712 / 150608698 is not a GRB
  80. Konus-Wind observation of GRB 150607A
  81. GRB 150607A: Fermi GBM Detection
  82. Konus-Wind observation of GRB 150530A
  83. GRB 150530A: Fermi GBM observation
  84. Fermi GBM trigger 150529948 is not a GRB
  85. Konus-Wind observation of GRB 150527A
  86. GRB 150527A: Fermi GBM observation
  87. GRB 150523A: Suzaku WAM observation of the prompt emission
  88. GRB 150523A: Swift ToO observations
  89. GRB 150513A: request for X-ray follow up
  90. Konus-Wind observation of GRB 150523A
  91. GRB 150523A: LCOGT Cerro-Tololo optical afterglow candidate
  92. GRB 150523A Swift-XRT afterglow detection
  93. GRB 150523B: Swift ToO observations
  94. GRB 150523A: Fermi-LAT detection
  95. GRB 150523A: Fermi GBM detection
  96. GRB 150518A: MASTER-net before, early and after optical stereoscopic observations with possible MP discovery inside MAXI error box
  97. Konus-Wind observation of GRB 150514A
  98. GRB 150514A: GROND Bright Afterglow Confirmation
  99. GRB 150514A: Fermi GBM Detection
  100. GRB 150514A: Swift-XRT afterglow detection

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