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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 110125A: Fermi GBM detection
  2. GRB 110120A: Suzaku WAM observation of the prompt emission
  3. Konus-Wind observation of GRB 110120A
  4. GRB 110123A: Fermi GBM detection
  5. GRB 110106B, radio observations
  6. GRB 110120A: MASTER optical observations
  7. GRB 110120A: Fermi LAT detection
  8. IPN triangulation of GRB 110120A
  9. GRB 110119A: Fermi GBM detection
  10. GRB 110120A: Fermi GBM detection
  11. GRB 110120A: MASTER optical observations
  12. New feature in Fermi GBM GRB Ground Position Notices
  13. GRB 110112B: Fermi GBM observation
  14. GRB 110107A: Swift-XRT Afterglow Candidate
  15. GRB 110107A detected in ground analysis of BAT slew data
  16. GRB 110106B: Fermi GBM detection
  17. GRB 110102A: Fermi GBM observation
  18. GRB 101224A: Fermi GBM observation
  19. GRB 101219B: Fermi GBM observation
  20. GRB 101213A: Fermi GBM observation
  21. GRB 101129A SHB found by IPN and in ground analysis of BAT data
  22. GRB 101201A: Fermi GBM observation
  23. GRB 101201A: GROND Detection of the Optical/NIR Afterglow
  24. GRB 101201A detected in ground analysis of BAT data
  25. GRB 101123A: ROTSE optical observations
  26. GRB 101123A: MASTER prompt optical observations
  27. Konus-Wind observation of GRB 101123A
  28. IPN triangulation of bright GRB 101123A
  29. GRB 101123A: Fermi GBM detection
  30. Fermi GBM detection of a burst from a galactic source
  31. GRB 101112A: Fermi GBM detection
  32. GRB 101024A: Fermi GBM observation
  33. GRB 101023A: Fermi GBM observation
  34. GRB 101014A: Fermi LAT detection
  35. GRB 101011A: Fermi GBM detection
  36. Konus-Wind observation of GRB 101014A
  37. GRB 101014A: Fermi GBM detection
  38. GRB 101008A: Fermi GBM observation
  39. GRB 100924A: Fermi GBM observation
  40. GRB 100916A: Fermi GBM detection
  41. GRB 100915B: Fermi GBM observation
  42. GRB 100910A: Fermi GBM detection
  43. GRB 100906A: Fermi GBM observation
  44. GRB 100829A: MASTER optical observations
  45. IPN Triangulation of the very bright GRB 100829A
  46. Konus-Wind observation of GRB 100826A
  47. GRB 100829.9: MASTER Optical Limits
  48. IPN triangulation of GRB 100826A
  49. GRB100826A: Fermi-LAT Observations
  50. GRB 100814A: Suzaku WAM observation of the prompt emission
  51. GRB 100814B: Fermi GBM detection
  52. GRB 100816A: Fermi GBM observation (correction to GCN 11124)
  53. GRB 100816A: Fermi GBM observation
  54. GRB 100814A: Fermi GBM observation
  55. GRB 100802A: Fermi GBM observation
  56. GRB 100728A: Suzaku WAM observation of the prompt emission
  57. GRB 100728B: Fermi GBM observation
  58. GRB 100728A: Fermi GBM observation
  59. GRB 100727A: Fermi GBM observation
  60. GRB 100724B: AGILE/GRID analysis
  61. GRB 100724B: Suzaku WAM observation of the prompt emission
  62. Konus-Wind observation of GRB 100724B
  63. GRB 100724B: Fermi LAT and GBM analysis
  64. GRB 100724B: Fermi GBM detection
  65. GRB 100724A: Swift-BAT refined analysis
  66. GRB 100722A: Fermi GBM detection
  67. GRB 100718A: MASTER-Net optical prompt and alert observations
  68. Fermi GBM trigger 300794561 (100714419) is not a GRB
  69. GRB 100707A: Suzaku WAM observation of the prompt emission
  70. Fermi GBM trigger 300370702 (100709513) is not a GRB
  71. Konus-Wind observation of GRB 100707A
  72. IPN triangulation of GRB 100707A
  73. GRB 100707A: Fermi LAT detection
  74. GRB 100707A: Fermi GBM detection
  75. IPN triangulation of GRB 100701B
  76. GRB 100704A: Fermi GBM observation
  77. Fermi GBM trigger 299767472 (100702531) is not a GRB
  78. GRB 100701B: Fermi GBM detection
  79. GRB 100625A: Fermi GBM detection
  80. GRB 100619A: Correction to the Fermi GBM trigger time
  81. GRB 100619A: Fermi GBM detection
  82. Fermi GBM trigger 100612038 is not a GRB
  83. GRB 100615A: Fermi GBM detection
  84. GRB 100528A: Faulkes Telescope North Detection
  85. GRB 100528A: GROND detection in all bands
  86. GRB 100528A: Fermi GBM observation
  87. GRB100522A: Suzaku WAM observation of the prompt emission
  88. GRB 100522A: GROND observations, upper limits
  89. GRB 100522A: Fermi GBM observation
  90. Update to the configuration of the Fermi-LAT onboard GRB search
  91. Fermi/GBM trigger 295791986 - unreliable location
  92. GRB 100517A: MASTER-Net wide field camera prompt optical observations
  93. GRB 100510A: Fermi GBM detection/observation
  94. GRB 100511A: Fermi GBM detection/observation
  95. GRB 100510A: MAXI/GSC detection
  96. GRB100503A: Suzaku WAM observation of the prompt emission
  97. Fermi Gamma-ray Burst Monitor trigger 294712621 is not a GRB
  98. GRB 100504A: Fermi GBM observation
  99. GRB 100503A: Fermi GBM detection
  100. GRB 100427A: Fermi GBM detection

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