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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"

12289 results found.

  1. GRB 101023A: Fermi GBM observation
  2. GRB 101014A: Fermi LAT detection
  3. GRB 101011A: Fermi GBM detection
  4. Konus-Wind observation of GRB 101014A
  5. GRB 101014A: Fermi GBM detection
  6. GRB 101008A: Fermi GBM observation
  7. GRB 100924A: Fermi GBM observation
  8. GRB 100916A: Fermi GBM detection
  9. GRB 100915B: Fermi GBM observation
  10. GRB 100910A: Fermi GBM detection
  11. GRB 100906A: optical observations at Mt.Terskol
  12. GRB 100906A: Fermi GBM observation
  13. GRB 100829A: MASTER optical observations
  14. GRB 100901A: multicolor photometry at Mt.Terskol
  15. IPN Triangulation of the very bright GRB 100829A
  16. Konus-Wind observation of GRB 100826A
  17. GRB 100829.9: MASTER Optical Limits
  18. IPN triangulation of GRB 100826A
  19. GRB100826A: Fermi-LAT Observations
  20. GRB 100814A: Suzaku WAM observation of the prompt emission
  21. GRB 100814B: Fermi GBM detection
  22. GRB 100816A: Fermi GBM observation (correction to GCN 11124)
  23. GRB 100816A: Fermi GBM observation
  24. GRB 100814A: Fermi GBM observation
  25. GRB 100802A: Fermi GBM observation
  26. GRB 100728A: Suzaku WAM observation of the prompt emission
  27. GRB 100728B: Fermi GBM observation
  28. GRB 100728A: Fermi GBM observation
  29. GRB 100727A: Fermi GBM observation
  30. GRB 100724B: AGILE/GRID analysis
  31. GRB 100724B: Suzaku WAM observation of the prompt emission
  32. Konus-Wind observation of GRB 100724B
  33. GRB 100724B: Fermi LAT and GBM analysis
  34. GRB 100724B: Fermi GBM detection
  35. GRB 100724A: Swift-BAT refined analysis
  36. GRB 100722A: Fermi GBM detection
  37. GRB 100718A: MASTER-Net optical prompt and alert observations
  38. Fermi GBM trigger 300794561 (100714419) is not a GRB
  39. GRB 100707A: Suzaku WAM observation of the prompt emission
  40. Fermi GBM trigger 300370702 (100709513) is not a GRB
  41. Konus-Wind observation of GRB 100707A
  42. IPN triangulation of GRB 100707A
  43. GRB 100707A: Fermi LAT detection
  44. GRB 100707A: Fermi GBM detection
  45. IPN triangulation of GRB 100701B
  46. GRB 100704A: Fermi GBM observation
  47. Fermi GBM trigger 299767472 (100702531) is not a GRB
  48. GRB 100701B: Fermi GBM detection
  49. GRB 100625A: Fermi GBM detection
  50. GRB 100619A: Correction to the Fermi GBM trigger time
  51. GRB 100619A: Fermi GBM detection
  52. Fermi GBM trigger 100612038 is not a GRB
  53. GRB 100615A: Fermi GBM detection
  54. GRB 100528A: Faulkes Telescope North Detection
  55. GRB 100528A: GROND detection in all bands
  56. GRB 100528A: Fermi GBM observation
  57. GRB100522A: Suzaku WAM observation of the prompt emission
  58. GRB 100522A: GROND observations, upper limits
  59. GRB 100522A: Fermi GBM observation
  60. Update to the configuration of the Fermi-LAT onboard GRB search
  61. Fermi/GBM trigger 295791986 - unreliable location
  62. GRB 100517A: MASTER-Net wide field camera prompt optical observations
  63. GRB 100510A: Fermi GBM detection/observation
  64. GRB 100511A: Fermi GBM detection/observation
  65. GRB 100510A: MAXI/GSC detection
  66. GRB100503A: Suzaku WAM observation of the prompt emission
  67. Fermi Gamma-ray Burst Monitor trigger 294712621 is not a GRB
  68. GRB 100504A: Fermi GBM observation
  69. GRB 100503A: Fermi GBM detection
  70. GRB 100427A: Fermi GBM detection
  71. GRB 100414A : EVLA Radio Detection
  72. GRB 100414A : WSRT Radio Detection
  73. GRB 100423B: Fermi GBM detection
  74. GRB 100414A: Radio Afterglow Detection with the Expanded VLA
  75. GRB 100414A: Confirmation of the X-ray afterglow
  76. GRB100414A: SAO RAS optical observations
  77. GRB 100414A: Suzaku WAM observation of the prompt emission
  78. GRB 100414A: Swift/UVOT Observations
  79. GRB 100414A: GROND Detection of the Optical Afterglow
  80. GRB 100414A: Gemini-N candidate and redshift
  81. GRB 100414A: Palomar Transient Factory Observations
  82. GRB 100414A: Swift-XRT detection of a possible X-ray afterglow
  83. GRB 100414A: IPN Localization
  84. Konus-Wind observation of GRB 100414B
  85. GRB 100414A: Fermi GBM detection
  86. GRB100414A: Fermi LAT detection
  87. GRB 100401A: Swift/UVOT Upper Limit
  88. Swift/BAT trigger 417974 (GRB100401A): Swift/XRT observations
  89. GRB 100401A: Fermi GBM detection
  90. IPN triangulation of GRB100324B
  91. Konus-Wind observation of GRB 100322A
  92. Fermi GBM detection of four Solar Flares
  93. GRB 100322A: Suzaku WAM observation of the prompt emission
  94. Fermi/GBM and Swift/BAT detection of a burst from SGR 1806-20
  95. GRB 100325A: Fermi LAT detection
  96. GRB 100325A: Fermi GBM detection
  97. GRB 100322A: Fermi GBM detection
  98. GRB 100224B: Fermi GBM detection
  99. GRB 100206A: optical observations in Terskol
  100. GRB 100225A: Fermi LAT detection

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