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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"

11525 results found.

  1. GRB 110123A: Fermi GBM detection
  2. GRB 110106B, radio observations
  3. GRB 110120A: MASTER optical observations
  4. GRB 110120A: Fermi LAT detection
  5. IPN triangulation of GRB 110120A
  6. GRB 110119A: Fermi GBM detection
  7. GRB 110120A: Fermi GBM detection
  8. GRB 110120A: MASTER optical observations
  9. New feature in Fermi GBM GRB Ground Position Notices
  10. GRB 110112B: Fermi GBM observation
  11. GRB 110107A: Swift-XRT Afterglow Candidate
  12. GRB 110107A detected in ground analysis of BAT slew data
  13. GRB 110106B: Fermi GBM detection
  14. GRB 110102A: Fermi GBM observation
  15. GRB 101224A: Fermi GBM observation
  16. GRB 101219B: Fermi GBM observation
  17. GRB 101213A: Fermi GBM observation
  18. GRB 101129A SHB found by IPN and in ground analysis of BAT data
  19. GRB 101201A: Fermi GBM observation
  20. GRB 101201A: GROND Detection of the Optical/NIR Afterglow
  21. GRB 101201A detected in ground analysis of BAT data
  22. GRB 101123A: ROTSE optical observations
  23. GRB 101123A: MASTER prompt optical observations
  24. Konus-Wind observation of GRB 101123A
  25. IPN triangulation of bright GRB 101123A
  26. GRB 101123A: Fermi GBM detection
  27. Fermi GBM detection of a burst from a galactic source
  28. GRB 101112A: Fermi GBM detection
  29. GRB 101024A: Fermi GBM observation
  30. GRB 101023A: Fermi GBM observation
  31. GRB 101014A: Fermi LAT detection
  32. GRB 101011A: Fermi GBM detection
  33. Konus-Wind observation of GRB 101014A
  34. GRB 101014A: Fermi GBM detection
  35. GRB 101008A: Fermi GBM observation
  36. GRB 100924A: Fermi GBM observation
  37. GRB 100916A: Fermi GBM detection
  38. GRB 100915B: Fermi GBM observation
  39. GRB 100910A: Fermi GBM detection
  40. GRB 100906A: Fermi GBM observation
  41. GRB 100829A: MASTER optical observations
  42. IPN Triangulation of the very bright GRB 100829A
  43. Konus-Wind observation of GRB 100826A
  44. GRB 100829.9: MASTER Optical Limits
  45. IPN triangulation of GRB 100826A
  46. GRB100826A: Fermi-LAT Observations
  47. GRB 100814A: Suzaku WAM observation of the prompt emission
  48. GRB 100814B: Fermi GBM detection
  49. GRB 100816A: Fermi GBM observation (correction to GCN 11124)
  50. GRB 100816A: Fermi GBM observation
  51. GRB 100814A: Fermi GBM observation
  52. GRB 100802A: Fermi GBM observation
  53. GRB 100728A: Suzaku WAM observation of the prompt emission
  54. GRB 100728B: Fermi GBM observation
  55. GRB 100728A: Fermi GBM observation
  56. GRB 100727A: Fermi GBM observation
  57. GRB 100724B: AGILE/GRID analysis
  58. GRB 100724B: Suzaku WAM observation of the prompt emission
  59. Konus-Wind observation of GRB 100724B
  60. GRB 100724B: Fermi LAT and GBM analysis
  61. GRB 100724B: Fermi GBM detection
  62. GRB 100724A: Swift-BAT refined analysis
  63. GRB 100722A: Fermi GBM detection
  64. GRB 100718A: MASTER-Net optical prompt and alert observations
  65. Fermi GBM trigger 300794561 (100714419) is not a GRB
  66. GRB 100707A: Suzaku WAM observation of the prompt emission
  67. Fermi GBM trigger 300370702 (100709513) is not a GRB
  68. Konus-Wind observation of GRB 100707A
  69. IPN triangulation of GRB 100707A
  70. GRB 100707A: Fermi LAT detection
  71. GRB 100707A: Fermi GBM detection
  72. IPN triangulation of GRB 100701B
  73. GRB 100704A: Fermi GBM observation
  74. Fermi GBM trigger 299767472 (100702531) is not a GRB
  75. GRB 100701B: Fermi GBM detection
  76. GRB 100625A: Fermi GBM detection
  77. GRB 100619A: Correction to the Fermi GBM trigger time
  78. GRB 100619A: Fermi GBM detection
  79. Fermi GBM trigger 100612038 is not a GRB
  80. GRB 100615A: Fermi GBM detection
  81. GRB 100528A: Faulkes Telescope North Detection
  82. GRB 100528A: GROND detection in all bands
  83. GRB 100528A: Fermi GBM observation
  84. GRB100522A: Suzaku WAM observation of the prompt emission
  85. GRB 100522A: GROND observations, upper limits
  86. GRB 100522A: Fermi GBM observation
  87. Update to the configuration of the Fermi-LAT onboard GRB search
  88. Fermi/GBM trigger 295791986 - unreliable location
  89. GRB 100517A: MASTER-Net wide field camera prompt optical observations
  90. GRB 100510A: Fermi GBM detection/observation
  91. GRB 100511A: Fermi GBM detection/observation
  92. GRB 100510A: MAXI/GSC detection
  93. GRB100503A: Suzaku WAM observation of the prompt emission
  94. Fermi Gamma-ray Burst Monitor trigger 294712621 is not a GRB
  95. GRB 100504A: Fermi GBM observation
  96. GRB 100503A: Fermi GBM detection
  97. GRB 100427A: Fermi GBM detection
  98. GRB 100414A : EVLA Radio Detection
  99. GRB 100414A : WSRT Radio Detection
  100. GRB 100423B: Fermi GBM detection

Advanced

Download all Circulars as a .tar.gz archive (updated once a day):
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