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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"

11099 results found.

  1. IPN Triangulation of GRB 151227B
  2. GRB 151229A: Fermi GBM observation
  3. GRB 151228B: Fermi GBM observation
  4. LIGO/Virgo G211117: DESGW program observations with DECam
  5. LIGO/Virgo G211117: Fermi GBM Observations
  6. GRB 151228A: Fermi GBM observation
  7. GRB 151227B: Fermi GBM detection
  8. GRB 151227A: Fermi GBM detection
  9. Konus-Wind observation of GRB 151222A
  10. Fermi GBM trigger 472694170/151224997 is not a GRB
  11. IPN Triangulation of GRB 151222A (short/hard)
  12. Fermi GBM trigger 151221730 is not a GRB
  13. GRB 151222A: Fermi GBM detection
  14. Fermi GBM trigger 151221690 is not a GRB
  15. Fermi GBM trigger 472271765/151220108 is not a GRB
  16. Fermi GBM trigger 472166503/151218890 is not a GRB
  17. LIGO/Virgo G184098: Fermi-LAT search for high-energy gamma-ray counterpart
  18. GRB 151212B: CALET Gamma-Ray Burst Monitor detection
  19. GRB 151210B: Fermi GBM observation
  20. GRB 151210B: CALET Gamma-Ray Burst Monitor detection
  21. GRB 151205A: Fermi GBM detection
  22. Fermi GBM trigger 470712580/151202062 is not a GRB
  23. Fermi GBM trigger 470290196/151127174 is not a GRB
  24. Fermi GBM trigger 470375959/151128166 is not a GRB
  25. GRB 151122A: Fermi GBM detection
  26. GRB 151122A: Swift detection of a burst
  27. Konus-Wind observation of GRB 151120A
  28. GRB 151120A: Fermi GBM observation
  29. LIGO/Virgo G194575: Fermi GBM Observations
  30. GRB 151107B: CALET Gamma-Ray Burst Monitor detection
  31. LIGO/Virgo G194575: VLA follow-up
  32. GRB 151111A: Fermi GBM observation
  33. GRB 151107B: MASTER-NET OT detection inside the FERMI error box
  34. GRB 151107B: Mini-MegaTORTORA limits on simultaneous optical emission
  35. GRB 151107B
  36. GRB 151027A: the missing GeV component
  37. GRB 151030A: Fermi GBM observation
  38. Konus-Wind observation of GRB 151027A
  39. GRB 151027A: Fermi GBM observation
  40. GRB 151006A: CALET Gamma-Ray Burst Monitor detection
  41. Possible Fermi-LAT Gamma-ray counterpart for LIGO/Virgo G194575
  42. LIGO/Virgo G194575: Fermi GBM Observations
  43. LIGO/Virgo G194575: Identification of a GW CBC Candidate
  44. GRB 151021B: Fermi GBM detection
  45. Fermi GBM trigger 466602792/151015495 is not a GRB
  46. Fermi GBM trigger 466316973/151012187 is not a GRB
  47. Fermi GBM trigger 466059859/151009211 is not a GRB
  48. Konus-Wind observation of GRB 151006A
  49. GRB 151006A: Fermi-LAT detection
  50. GRB 151006A: Fermi GBM detection
  51. GRB 151001A: Fermi GBM detection
  52. Konus-Wind observation of GRB 150922A
  53. GRB 150922A: Fermi GBM observation
  54. IPN Triangulation of GRB 150922A (short/hard)
  55. LIGO/Virgo G184098: INTEGRAL search of temporally coincident prompt hard X-ray emission
  56. ANTARES neutrino detection: Fermi GBM Observations
  57. Fermi GBM trigger bn150920977 is not due to a GRB
  58. LIGO/Virgo G184098: DESGW followup program
  59. LIGO/Virgo G184098: DESGW followup program
  60. LIGO/Virgo G184098: Fermi-GBM ground-based follow-up
  61. Fermi GBM trigger 463890496/150914103 is not a GRB
  62. GRB 150912A: Fermi GBM observation
  63. Fermi GBM trigger 463422723/150908689 is not a GRB
  64. Fermi GBM trigger 463339482/150907725 is too weak to be classified
  65. Fermi GBM trigger 150907763 is not a GRB
  66. GRB 150906A: Fermi GBM detection
  67. GRB 150902A: Swift-XRT afterglow detection
  68. GRB 150902A: Swift-XRT observations
  69. GRB 150902A: MASTER-SAAO optical observations
  70. Konus-Wind observation of GRB 150902A
  71. GRB 150902A: Swift ToO observations
  72. GRB 150902A: Fermi GBM detection
  73. GRB 150902A: Fermi-LAT detection
  74. GRB 150831B: MASTER-IAC early optical observations
  75. GRB 150831B: Fermi GBM detection
  76. Fermi GBM trigger 150829183 is not a GRB
  77. Fermi GBM trigger 150828520 is not a GRB
  78. Fermi GBM trigger 150827524 is not a GRB
  79. Fermi GBM trigger 150826536 is not a GRB
  80. Konus-Wind observation of GRB 150824A
  81. IPN Triangulation of GRB 150824A
  82. GRB 150824A: Fermi GBM detection
  83. Konus-Wind observation of GRB 150821A
  84. GRB 150821A: Fermi GBM detection
  85. Konus-Wind observation of GRB 150819B
  86. GRB 150819B: Fermi GBM detection
  87. IPN Triangulation of GRB 150819B (short / very intense)
  88. MASTER OT inside bright ESO240-010 galaxy detection during FERMI trigger GRB150816.83 inspection
  89. GRB 150817A: Fermi GBM observation
  90. Fermi GBM Trigger 150815694 is not a GRB
  91. GBM Trigger 150813665 is not a GRB
  92. Konus-Wind observation of GRB 150811B
  93. IPN Triangulation of GRB 150811B
  94. GRB 150811B: Fermi GBM detection
  95. GRB 150810A: Fermi GBM detection
  96. Fermi GBM GRB Trigger 460608875: iPTF P48 Observations
  97. Fermi GBM trigger 150807969 is not a GRB
  98. Fermi GBM trigger 150806450 is not a GRB
  99. Fermi GBM trigger 150805556 is not a GRB
  100. Fermi GBM triggers 150730606 150731173 and 150801590 are not due to GRBs

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