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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"

26271 results found.

  1. GRB 090529: Preliminary Swift/UVOT Upper Limit
  2. GRB 090529: Xinglong TNT optical observation
  3. GRB 090529: Swift detection of a burst
  4. GRB 090520D: Fermi GBM detection
  5. GRB 090520C: Fermi GBM detection
  6. GRB 090520B: Fermi GBM detection
  7. GRB090518B optical limit by "Pi of the Sky"
  8. GRB 090522 : Fermi GBM detection
  9. GRB 090524: Fermi GBM detection
  10. GRB 090516A: Konus-Wind and Swift/BAT joint spectral analysis
  11. GRB 090513B: Fermi GBM detection
  12. GRB 090518: Fermi GBM detection
  13. GRB 090516C: Fermi GBM detection
  14. GRB 090520 Swift-BAT detection of a burst in ground analysis
  15. GRB 090516: Fermi GBM observation
  16. GRB 090516B: Fermi GBM detection
  17. GRB 090519B: Fermi GBM detection
  18. GRB 090519: Swift-XRT refined analysis
  19. GRB 090519: GROND observation
  20. GRB 090519: Swift/UVOT Upper Limits
  21. GRB 090519, Swift-BAT refined analysis
  22. GRB 090519: Limits from BOOTES-1B
  23. GRB 090519: FARO Chante Perdrix Observatory optical observations
  24. GRB 090519: TAROT Calern observatory optical observations
  25. GRB 090519: Swift detection of a burst
  26. GRB 090511: Fermi GBM Detection
  27. GRB 090514: Fermi GBM detection
  28. GRB 090518: Swift/UVOT Upper Limits
  29. GRB 090518, Swift-BAT refined analysis
  30. GRB 090518B: Fermi GBM detection
  31. GRB 090516, RIMOTS optical upper limits
  32. GRB090513: Fermi GBM detection
  33. GRB 090518: Swift-XRT refined analysis
  34. GRB 090518: Swift detection of a burst
  35. GRB 090516: Swift-BAT refined analysis
  36. GRB 090516: GROND OBSERVATIONS
  37. GRB 090516 - Zadko Telescope observations
  38. GRB 090516: Swift XRT refined analysis
  39. GRB 090516: Swift/UVOT Observations
  40. GRB 090516: Faulkes Telescope South optical afterglow
  41. GRB 090516: Swift detection of a burst
  42. GRB 090515: Lick Upper Limits
  43. GRB 090515: ROVOR Upper Limit
  44. GRB 090515: MMT/MMIRS NIR Upper Limit
  45. GRB 090515: Swift/UVOT Observations
  46. GRB 090515: Swift-XRT refined analysis
  47. GRB 090509: Fermi GBM observation
  48. GRB 090515: Swift-BAT refined analysis
  49. GRB 090509 - Zadko Telescope observations
  50. GRB 090515: WIYN NIR Upper Limit
  51. GRB 090515: Super-LOTIS Upper Limits
  52. GRB 090515: PAIRITEL Upper Limits
  53. GRB 090515: KAIT optical upper limits
  54. GRB 090515: ROTSE-III Optical Limits
  55. GRB 090515: Swift detection of a short burst
  56. GRB 090510: Suzaku WAM observation of the prompt emission
  57. GRB 090510: Swift/UVOT host galaxy candidates
  58. GRB 090510: Fermi-LAT follow-up analysis
  59. GRB 090509, further Swift-BAT refined analysis
  60. Fermi Gamma-ray Burst Monitor trigger 263649437 is not a GRB
  61. GRB 090510B: Fermi GBM detection
  62. GRB 090502: Fermi GBM detection
  63. Konus-Wind observation of GRB 090510
  64. GRB 090510: UVOT refined analysis
  65. GRB 090510: Swift XRT refined analysis
  66. GRB 090510: Swift-BAT refined analysis
  67. GRB 090510: Fermi GBM detection
  68. GRB 090509: Swift-BAT refined analysis
  69. Fermi LAT detection of GRB 090510
  70. GRB 090510: Swift/UVOT Detection of a Candidate Optical Afterglow
  71. GRB 090510: Swift detection of a short hard burst
  72. GRB 090408: optical upper limit
  73. GRB 090509: GROND further analysis and redshift limit
  74. GRB 090509: GROND afterglow candidate
  75. GRB 090509: Swift detection of a burst
  76. GRB 090323: optical observations
  77. GRB 090424: optical observations
  78. GRB 090429A: ROVOR magnitude limit
  79. GRB 090428B: Suzaku WAM observation of the prompt emission
  80. GRB 090426: optical observations
  81. GRB 090429D: Fermi GBM detection
  82. GRB 090429C: Fermi GBM detection
  83. GRB 090429B: Swift/UVOT Upper Limits
  84. GRB 090429A: Swift/UVOT Upper Limits
  85. GRB 090424: YNAO-GMG observations
  86. GRB 090429A: GROND upper limits
  87. GRB 090427C: Fermi GBM detection
  88. GRB 090427B: Fermi GBM detection
  89. GRB 090426C: Fermi GBM detection
  90. GRB 090426B: Fermi GBM detection/observation
  91. GRB 090429B: Swift XRT refined analysis
  92. GRB 090428B: Fermi GBM detection
  93. GRB 090428: Fermi GBM detection
  94. GRB 090426: GAO 150cm telescope Optical Observation
  95. GRB 090429B: RIMOTS optical upper limits
  96. GRB 090429B: Swift-BAT refined analysis
  97. GRB 090429A: Swift-BAT refined analysis
  98. GRB 090426: YNAO-GMG observations
  99. GRB 090429B: GROND Observations
  100. GRB 090429B: Super-LOTIS early observations

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