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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"

11547 results found.

  1. GRB 150922A: Fermi GBM observation
  2. IPN Triangulation of GRB 150922A (short/hard)
  3. LIGO/Virgo G184098: INTEGRAL search of temporally coincident prompt hard X-ray emission
  4. ANTARES neutrino detection: Fermi GBM Observations
  5. Fermi GBM trigger bn150920977 is not due to a GRB
  6. LIGO/Virgo G184098: DESGW followup program
  7. LIGO/Virgo G184098: DESGW followup program
  8. LIGO/Virgo G184098: Fermi-GBM ground-based follow-up
  9. Fermi GBM trigger 463890496/150914103 is not a GRB
  10. GRB 150912A: Fermi GBM observation
  11. Fermi GBM trigger 463422723/150908689 is not a GRB
  12. Fermi GBM trigger 463339482/150907725 is too weak to be classified
  13. Fermi GBM trigger 150907763 is not a GRB
  14. GRB 150906A: Fermi GBM detection
  15. GRB 150902A: Swift-XRT afterglow detection
  16. GRB 150902A: Swift-XRT observations
  17. GRB 150902A: MASTER-SAAO optical observations
  18. Konus-Wind observation of GRB 150902A
  19. GRB 150902A: Swift ToO observations
  20. GRB 150902A: Fermi GBM detection
  21. GRB 150902A: Fermi-LAT detection
  22. GRB 150831B: MASTER-IAC early optical observations
  23. GRB 150831B: Fermi GBM detection
  24. Fermi GBM trigger 150829183 is not a GRB
  25. Fermi GBM trigger 150828520 is not a GRB
  26. Fermi GBM trigger 150827524 is not a GRB
  27. Fermi GBM trigger 150826536 is not a GRB
  28. Konus-Wind observation of GRB 150824A
  29. IPN Triangulation of GRB 150824A
  30. GRB 150824A: Fermi GBM detection
  31. Konus-Wind observation of GRB 150821A
  32. GRB 150821A: Fermi GBM detection
  33. Konus-Wind observation of GRB 150819B
  34. GRB 150819B: Fermi GBM detection
  35. IPN Triangulation of GRB 150819B (short / very intense)
  36. MASTER OT inside bright ESO240-010 galaxy detection during FERMI trigger GRB150816.83 inspection
  37. GRB 150817A: Fermi GBM observation
  38. Fermi GBM Trigger 150815694 is not a GRB
  39. GBM Trigger 150813665 is not a GRB
  40. Konus-Wind observation of GRB 150811B
  41. IPN Triangulation of GRB 150811B
  42. GRB 150811B: Fermi GBM detection
  43. GRB 150810A: Fermi GBM detection
  44. Fermi GBM GRB Trigger 460608875: iPTF P48 Observations
  45. Fermi GBM trigger 150807969 is not a GRB
  46. Fermi GBM trigger 150806450 is not a GRB
  47. Fermi GBM trigger 150805556 is not a GRB
  48. Fermi GBM triggers 150730606 150731173 and 150801590 are not due to GRBs
  49. Fermi GBM GRB Trigger 458852670: iPTF P48 Observations
  50. GRB 150721A (Fermi GBM Trigger 459150552): iPTF P48 Observations
  51. GRB 150724B: Swift-XRT afterglow detection
  52. GRB 150727A: Fermi GBM detection
  53. GRB 150724B: Continued RATIR Optical Observations
  54. GRB 150724B: MASTER upper limit
  55. GRB 150724B: Swift/UVOT Detection
  56. Konus-Wind observation of GRB 150724B
  57. GRB 150724B: Swift-XRT observations
  58. GRB 150724B: Swift ToO observations
  59. GRB 150724B: Fermi GBM detection
  60. GRB 150724B: Fermi-LAT detection
  61. Fermi GBM trigger 150725291 is not a GRB
  62. GRB 150721A: Fermi GBM detection
  63. Fermi GBM triggers bn150715759 and bn150715817 are not due to GRBs
  64. Fermi Gamma-ray Burst Monitor triggers that are not GRBs
  65. Fermi GBM trigger 458312518/150711543 is not a GRB
  66. GRB 150711A: Fermi GBM detection
  67. MASTER OT Detection during Fermi Trigger 458235025 inspection
  68. Fermi Gamma-ray Burst Monitor Trigger bn150705731 is not a GRB
  69. Konus-Wind observation of GRB 150702A
  70. GRB 150702A: Fermi GBM detection
  71. IPN Triangulation of GRB 150702A
  72. GRB 150702A: MASTER-SAAO inspection
  73. GRB 150702A: Swift-XRT observations
  74. GRB 150702A: Swift ToO observations
  75. GRB 150702A: Fermi-LAT detection
  76. Fermi GBM Observations is no longer triggerin on V404 Cyg
  77. Fermi Gamma-ray Burst Monitor Trigger 150626873 is not a GRB
  78. Fermi Gamma-ray Burst Monitor Trigger bn150628857 is not a GRB
  79. Fermi Gamma-ray Burst Monitor trigger bn150629779 is not a GRB
  80. Konus-Wind observation of GRB 150627A
  81. V404 Cyg activity (Swift, Fermi, INTGRAL, KONUS, MAXI detection): optical observations in TSHAO, Khureltogot, and AAO
  82. GRB 150627A: Swift/UVOT Detection
  83. GRB 150627A: Swift-XRT afterglow detection
  84. GRB 150627A: Fermi GBM observation
  85. GRB 150627A: Swift ToO observations
  86. GRB 150627A: Fermi-LAT detection
  87. Fermi Gamma-ray Burst Monitor triggers that are not GRBs
  88. Fermi Gamma-ray Burst Monitor triggers bn150622899 and bn150623043 are not GRBs
  89. V404 Cyg: Fermi GBM observations
  90. V404 Cyg outburst (Swift trigger 643949 ): TSHAO optical observations
  91. Konus-Wind observation of Galactic transient V404 Cyg in outburst
  92. Fermi GBM trigger 150616734 is not a GRB
  93. Fermi GBM trigger 150616594 is not a GRB
  94. Fermi Gamma-ray Burst Monitor triggers bn150615791 and bn150615798 are not GRBs
  95. Fermi GBM trigger 150615574 is not a GRB
  96. Fermi GBM trigger 150613619 is not a GRB
  97. Fermi GBM trigger 150612648 is not a GRB
  98. Fermi Gamma-ray Burst Monitor trigger 455474712 / 150608698 is not a GRB
  99. Konus-Wind observation of GRB 150607A
  100. GRB 150607A: Fermi GBM Detection

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