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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"

12288 results found.

  1. GRB 130305A: Fermi GBM observation
  2. GRB 130305A: Fermi LAT Detection
  3. Fermi GBM trigger 130301.638 is not GRB
  4. GBM trigger 383712005 (GRB 130228A?) : Possible high-energy photon emission in Fermi/LAT data
  5. GRB 130305A found in ground analysis of Swift/BAT data
  6. Konus-Wind observation of GRB 130219A
  7. IPN Triangulation of GRB 130219A
  8. GRB 130219A: Fermi GBM detection
  9. GRB 130216B: MASTER-Net early observation
  10. GRB 130216A: MASTER-Net early observations
  11. GRB 130216A: Fermi GBM observation
  12. GRB 130216B: Fermi GBM observation
  13. GRB 130216B: Burst found in ground analysis of BAT data
  14. GRB 130215A: Fermi GBM detection
  15. GRB 130215A: ROTSE-III data analysis
  16. GRB 130206A: Fermi LAT Observations
  17. GRB 130206A: Fermi GBM observation
  18. GRB 130127A: Fermi GBM detection
  19. Konus-Wind observation of GRB 121225B
  20. IPN Triangulation of GRB 121225B
  21. GRB 121225B: Fermi GBM observation
  22. GRB 121225B: Fermi LAT Detection
  23. GRB 121217A: Fermi GBM observation
  24. GRB 121211A: Fermi GBM observation
  25. GRB 121202A: Fermi GBM observation
  26. IPN Triangulation of GRB 121127A (short/hard)
  27. GRB 121122A: Fermi GBM observation
  28. GRB 121128A: Fermi GBM observation
  29. IPN Triangulation of GRB 121122A (long/intense)
  30. GRB 121125A: Fermi GBM Observation
  31. GRB 121123A: GROND observations
  32. GRB 121123A: Fermi GBM observation
  33. IPN Triangulation of GRB 121118A
  34. Fermi GBM trigger 121115.186 is not a GRB
  35. GRB 121031A: Fermi GBM detection
  36. GRB 121029A Suzaku WAM observation of the prompt emission
  37. GRB 121029A: Fermi GBM detection
  38. GRB 121011A Suzaku WAM observation of the prompt emission
  39. GRB 121012A: Fermi GBM detection
  40. GRB 121011A: NOT redshift retraction
  41. GRB 121011A: Fermi GBM observation
  42. GRB 121011A: Fermi-LAT detection of a burst
  43. GRB 120921A: Fermi GBM detection of its 1000th GRB
  44. GRB 120916A Suzaku WAM observation of the prompt emission
  45. GRB 120922A: Fermi GBM detection
  46. GRB 120919B: MASTER prompt optical observations
  47. IPN Triangulation of long GRB 120919B
  48. Konus-Wind observation of GRB 120919A
  49. IPN Triangulation of long GRB 120919A
  50. GRB 120919A: Fermi GBM detection
  51. GRB 120916A: Fermi GBM Observation
  52. Konus-Wind observation of GRB 120916A
  53. IPN Triangulation of long GRB 120916A
  54. GRB 120916A: Fermi-LAT detection of a burst
  55. Corrections to the Fermi-LAT upper limits for GRB 120807A, 120908A, 120909A, and 120911A
  56. GRB 120913B: Fermi GBM observation
  57. GRB 120913A: Fermi GBM observation
  58. Konus-Wind observation of GRB 120911B
  59. GRB 120911B: Fermi GBM observation
  60. GRB 120911B: Fermi-LAT detection of a burst
  61. GRB 120911A: Fermi GBM observation
  62. GRB 120911A: Fermi/LAT upper limit
  63. GRB 120908A and GRB 120909A : Fermi/LAT upper limit
  64. GRB 120908A: Fermi GBM detection
  65. GRB 120909A: Fermi GBM observation
  66. GRB 120907A: Fermi GBM detection
  67. GRB 120830A: Further Swift Observations
  68. GRB 120830A: Swift-XRT and UVOT observations
  69. GRB 120830A: Fermi GBM observation
  70. Konus-Wind observation of GRB 120830A
  71. GRB 120830A: early MASTER optical limit
  72. IPN Triangulation of short GRB 120830A
  73. GRB 120830A: Fermi-LAT detection of a short burst
  74. Fermi trigger 368003226 : MASTER optical observations
  75. Konus-Wind observation of GRB 120817B
  76. GRB 120817B: Fermi GBM detection
  77. IPN Triangulation of GRB 120817B (short/very intense)
  78. GRB 120811B: Fermi GBM observation
  79. GCN for GRB 120811C
  80. Improved IPN error box for short hard GRB 120811B
  81. IPN Triangulation of short hard GRB 120811B
  82. GRB 120807A: Fermi/LAT upper limit
  83. Fermi/GBM detection of an SGR-like burst
  84. GRB 120728A: Fermi GBM observation
  85. GRB 120729A: Fermi GBM observation
  86. GRB 120728B: Fermi GBM detection
  87. IPN Triangulation of GRB 120728B (long/intense)
  88. GRB 120727A/Galactic source: Fermi-LAT detection of a transient source
  89. GRB 120709A: Swift re-observation of the field of the X-ray counterpart candidate.
  90. GRB 120716A: Fermi GBM observation
  91. IPN Triangulation of unusual GRB 120716A
  92. Fermi GBM trigger 120716.498 is not a GRB
  93. GRB 120624B: VLA Observations
  94. GRB 120712A: Fermi GBM observation
  95. IPN Triangulation of GRB 120709A
  96. GRB 120711A: Fermi LAT Detection
  97. Konus-Wind observation of GRB 120711A
  98. GRB 120711A: Fermi LAT detection
  99. GRB 120711A: MASTER early OT detection
  100. Konus-Wind observation of GRB 120709A

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