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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"

11102 results found.

  1. IPN Triangulation of GRB 150330A (long/very intense)
  2. GRB 150330A: Fermi GBM detection
  3. Konus-Wind observation of GRB 150323B
  4. GRB150323C: Fermi GBM detection
  5. GRB 150323B: Fermi GBM observation
  6. GRB 150323B detected in ground analysis of Swift-BAT data
  7. Fermi GBM trigger 150319666 is not a GRB
  8. Konus-Wind observation of GRB 150314A
  9. GRB 150314A: Redshift from OSIRIS/GTC
  10. GRB 150314A: Fermi GBM observation
  11. GRB 150314A: Fermi-LAT detection
  12. Fermi GBM trigger 150312827 is not a GRB
  13. Fermi GBM trigger 150311331 is not a GRB
  14. GRB 150309A: Fermi GBM detection
  15. GRB 150309A: MASTER prompt optical observation
  16. Fermi GBM trigger 150307942 is not a GRB
  17. Fermi GBM trigger 150305751 is not a GRB
  18. GRB 150301B: LCOGT-Sutherland observations
  19. GRB 150301B: Fermi GBM detection
  20. GRB 150301A: Swift-BAT refined analysis
  21. GRB 150301A: Fermi GBM observation
  22. Fermi GBM Observations of Magnetar 4U 0142+61
  23. GRB 150220A: Fermi GBM observation
  24. IPN Triangulation of GRB 150220A
  25. Fermi GBM Observations of SGR 1935+2154
  26. Fermi GBM trigger 150223068 is not a GRB
  27. Fermi GBM trigger 150220229 is not a GRB
  28. GRB 150219A: Fermi GBM observation
  29. GRB 150213A: Fermi GBM detection
  30. GRB 150210A: Swift-XRT observations
  31. GRB 150210A: MASTER SN detection during LAT error box inspection
  32. GRB 150210A: Tiled Swift observations
  33. Konus-Wind observation of GRB 150210A
  34. IPN Triangulation of GRB 150210A
  35. GRB 150210A: Fermi-LAT detection
  36. GRB 150210A: Fermi GBM detection
  37. Konus-Wind observation of GRB 150202B
  38. GRB 150206B: Fermi GBM detection
  39. GRB 150206B: iPTF Optical Observations
  40. GRB 150204A: LCOGT-Sutherland and Siding Springs observations
  41. GRB 150204A: Fermi GBM detection
  42. GRB 150202B: Swift XRT/UVOT observations
  43. GRB 150204A found in ground analysis of Swift-BAT data
  44. IPN Triangulation of GRB 150202B
  45. GRB 150202B: Tiled Swift observations
  46. Fermi GBM trigger 150202624 is not a GRB
  47. GRB 150203A: Fermi GBM observation
  48. GRB 150202B: Fermi GBM detection
  49. GRB 150202B: Fermi-LAT detection
  50. Konus-Wind observation of GRB 150201A
  51. GRB 150201A: Fermi GBM observation
  52. GRB 150128A: MASTER OT detction during inspection
  53. GRB 150127B: Fermi GBM detection
  54. IPN Triangulation of GRB 150127B
  55. IPN Triangulation of GRB 150127A
  56. Konus-Wind observation of GRB 150126A reveals its ultra-long nature
  57. GRB 150127A: Fermi-LAT detection
  58. GRB150127A: Fermi GBM Detection
  59. GRB 150126A: Fermi GBM Detection
  60. GRB 150126A: MAXI/GSC afterglow candidate detection
  61. Konus-Wind observation of GRB 150118B
  62. IPN Triangulation of GRB 150118B (long/intense)
  63. GRB 150118C: Fermi GBM Detection
  64. IPN triangulation of GRB 150118C (short/hard)
  65. GRB 150120A: Fermi GBM observation
  66. GRB 150118B: Fermi GBM Detection
  67. GRB 150118B: Fermi-LAT detection
  68. GRB 150110A: MASTER inspection
  69. GRB 150110B: Fermi GBM Detection
  70. GRB 150110A: Fermi GBM Detection
  71. GRB 150110A: MAXI/GSC detection
  72. Fermi GBM trigger 150108121 is not a GRB
  73. Fermi GBM trigger 150106207 is not a GRB
  74. GRB 150105A: Fermi GBM detection
  75. GRB 150101B: potential host galaxy redshift by GTC
  76. GRB 150101B: Fermi GBM detection
  77. Swift J123205.1-105602: Magellan candidate afterglow
  78. Short burst found in ground analysis of Swift-BAT data
  79. GRB 150101A: Fermi GBM detection
  80. Konus-Wind observation of GRB 141229A
  81. Swift-XRT and UVOT follow-up of iPTF14jko (GRB 141230A)
  82. GRB 141230A: Fermi GBM detection
  83. GRB 141230A: Nanshan optical obsrvations
  84. GRB 141230A: iPTF Optical Observations and Candidate Afterglow iPTF14jko
  85. GRB 141229A: Swift-XRT observations
  86. Fermi GBM trigger 141229739 is not a GRB
  87. GRB 141229A: Fermi GBM detection
  88. GRB 141229A Tiled Swift observations
  89. GRB 141225A: MASTER-SAAO OT light curve
  90. GRB 141225A: Fermi GBM detection
  91. GRB 141225A: MASTER-SAAO first OT detection
  92. Swift XRT and UVOT observations of GRB141222A
  93. Konus-Wind observation of GRB 141222A
  94. IPN Triangulation of GRB 141222A (very intense)
  95. GRB 141222A: Fermi GBM detection
  96. GRB 141222A: Fermi-LAT detection
  97. GRB 141221A: Fermi GBM observation
  98. Konus-Wind observation of GRB 141220A
  99. GRB 141220A: Fermi GBM observation
  100. Fermi Gamma-ray Burst Monitor trigger 440728127 / 141220020 is not a GRB

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