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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"

27408 results found.

  1. GRB 090530B: Fermi GBM detection
  2. Corrections to GRB 090531B Swift/UVOT Upper Limits
  3. GRB 090531B, RIMOTS optical upper limits
  4. GRB 090531B: Swift/UVOT Upper Limits
  5. GRB 090530: GRT Optical Observation
  6. GRB 090531B: Swift-BAT refined analysis
  7. Initial Swift/UVOT observations of GRB 090531B
  8. GRB 090531B: Swift-XRT candidate afterglow position
  9. GRB 090531B: ROTSE-III Optical Limits
  10. GRB 090531B: Swift detection of a burst
  11. GRB 090531: Swift-BAT refined analysis
  12. GRB 090530: break in light curve
  13. GRB 090531: GROND upper limits
  14. GRB 090531: P60 Observations
  15. GRB 090531: Swift detection of a burst
  16. GRB090530: Swift XRT refined analysis
  17. GRB090530: Swift/UVOT afterglow detection
  18. GRB 090529: Swift-XRT refined analysis
  19. GRB 090528B: Fermi GBM detection
  20. GRB 090528: Fermi GBM detection
  21. GRB 090530: Swift-BAT refined analysis
  22. GRB 090530: PAIRITEL NIR Detections
  23. GRB 090530A: ROTSE-III Detection of Optical Counterpart
  24. GRB 090530: Swift detection of a burst with an optical counterpart
  25. GRB090529: UVOT/Swift detection of a brightening optical afterglow
  26. GRB 090529: Swift-BAT refined analysis
  27. GRB 090529: Preliminary Swift/UVOT Upper Limit
  28. GRB 090529: Xinglong TNT optical observation
  29. GRB 090529: Swift detection of a burst
  30. GRB 090520D: Fermi GBM detection
  31. GRB 090520C: Fermi GBM detection
  32. GRB 090520B: Fermi GBM detection
  33. GRB090518B optical limit by "Pi of the Sky"
  34. GRB 090522 : Fermi GBM detection
  35. GRB 090524: Fermi GBM detection
  36. GRB 090516A: Konus-Wind and Swift/BAT joint spectral analysis
  37. GRB 090513B: Fermi GBM detection
  38. GRB 090518: Fermi GBM detection
  39. GRB 090516C: Fermi GBM detection
  40. GRB 090520 Swift-BAT detection of a burst in ground analysis
  41. GRB 090516: Fermi GBM observation
  42. GRB 090516B: Fermi GBM detection
  43. GRB 090519B: Fermi GBM detection
  44. GRB 090519: Swift-XRT refined analysis
  45. GRB 090519: GROND observation
  46. GRB 090519: Swift/UVOT Upper Limits
  47. GRB 090519, Swift-BAT refined analysis
  48. GRB 090519: Limits from BOOTES-1B
  49. GRB 090519: FARO Chante Perdrix Observatory optical observations
  50. GRB 090519: TAROT Calern observatory optical observations
  51. GRB 090519: Swift detection of a burst
  52. GRB 090511: Fermi GBM Detection
  53. GRB 090514: Fermi GBM detection
  54. GRB 090518: Swift/UVOT Upper Limits
  55. GRB 090518, Swift-BAT refined analysis
  56. GRB 090518B: Fermi GBM detection
  57. GRB 090516, RIMOTS optical upper limits
  58. GRB090513: Fermi GBM detection
  59. GRB 090518: Swift-XRT refined analysis
  60. GRB 090518: Swift detection of a burst
  61. GRB 090515: Swift/BAT spectral lag results
  62. GRB 090516: Swift-BAT refined analysis
  63. GRB 090516: GROND OBSERVATIONS
  64. GRB 090516 - Zadko Telescope observations
  65. GRB 090516: Swift XRT refined analysis
  66. GRB 090516: Swift/UVOT Observations
  67. GRB 090516: Faulkes Telescope South optical afterglow
  68. GRB 090516: Swift detection of a burst
  69. GRB 090515: Lick Upper Limits
  70. GRB 090515: ROVOR Upper Limit
  71. GRB 090515: MMT/MMIRS NIR Upper Limit
  72. GRB 090515: Swift/UVOT Observations
  73. GRB 090515: Swift-XRT refined analysis
  74. GRB 090509: Fermi GBM observation
  75. GRB 090515: Swift-BAT refined spectral analysis
  76. GRB 090515: Swift-BAT refined analysis
  77. GRB 090509 - Zadko Telescope observations
  78. GRB 090515: WIYN NIR Upper Limit
  79. GRB 090515: Super-LOTIS Upper Limits
  80. GRB 090515: PAIRITEL Upper Limits
  81. GRB 090515: KAIT optical upper limits
  82. GRB 090515: ROTSE-III Optical Limits
  83. GRB 090515: Swift detection of a short burst
  84. GRB 090510: Suzaku WAM observation of the prompt emission
  85. GRB 090510: Swift/UVOT host galaxy candidates
  86. GRB 090510: Fermi-LAT follow-up analysis
  87. GRB 090509, further Swift-BAT refined analysis
  88. Fermi Gamma-ray Burst Monitor trigger 263649437 is not a GRB
  89. GRB 090510B: Fermi GBM detection
  90. GRB 090502: Fermi GBM detection
  91. Konus-Wind observation of GRB 090510
  92. GRB 090510: UVOT refined analysis
  93. GRB 090510: Swift XRT refined analysis
  94. GRB 090510: Swift-BAT refined analysis
  95. GRB 090510: Fermi GBM detection
  96. GRB 090509: Swift-BAT refined analysis
  97. Fermi LAT detection of GRB 090510
  98. GRB 090510: Swift/UVOT Detection of a Candidate Optical Afterglow
  99. GRB 090510: Swift detection of a short hard burst
  100. GRB 090408: optical upper limit

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