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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"

27289 results found.

  1. GRB 090407: Swift-BAT refined analysis
  2. GRB 090407: ROTSE-III Optical Limits
  3. GRB 090407: Swift detection of a burst
  4. GRB 090404: millimeter detection
  5. GRB 090404: nIR observations at Calar Alto
  6. GRB 090405: Fermi GBM Detection
  7. GRB 090403: Fermi GBM detection
  8. Swift/UVOT observations of GRB090404
  9. GRB 090404: optical observations at BOOTES-3 and 1.5-m OSN
  10. GRB 090404: Swift-XRT Team refined analysis
  11. GRB 090404: Swift-BAT refined analysis
  12. GRB 090404: Enhanced Swift-XRT position
  13. GRB 090404: Swift detection of a burst
  14. GRB 090401A: Suzaku WAM observation of the prompt emission
  15. GRB 090401B: Suzaku WAM observation of the prompt emission
  16. Konus-Wind observation of GRB 090401B
  17. GRB 090401B: VLA radio upper limit
  18. GRB090401B, RIMOTS optical upper limits
  19. Swift/UVOT observations of GRB090401B
  20. GRB 090401B: AGILE refined analysis
  21. Swift/UVOT observations of GRB090401B
  22. GRB 090401B: Swift XRT Refined Analysis
  23. GRB 090331: Fermi GBM detection
  24. Konus-Wind observation of GRB 090401A
  25. GRB 090401B: Enhanced Swift-XRT position
  26. AGILE Gamma-ray detection of GRB 090401B
  27. GRB 090401B: Swift-BAT refined analysis
  28. Swift/UVOT detection of GRB090401B
  29. GRB 090401B: Swift detection of a burst
  30. GRB 090401, Swift-BAT refined analysis
  31. GRB 090323: Further TLS detections - a break?
  32. GRB 090401: Swift detection of a burst
  33. GRB 090328: Radio afterglow detection
  34. GRB 090326: Fermi GBM detection
  35. GRB 090328: BOOTES-3 optical observations
  36. GRB 090328B: Fermi GBM Detection
  37. GRB 090330: Fermi GBM detection
  38. GRB 090328: GROND Detection of the Optical/NIR Afterglow
  39. GRB 090328: Swift XRT refined analysis
  40. GRB 090328: Swift UVOT observations
  41. GRB 090323: WSRT Radio Detection
  42. GRB 090328: Updated position/optical afterglow candidate
  43. GRB 090328: Possible Swift/XRT detection
  44. Fermi LAT and GBM detections of GRB090328
  45. GRB 090323: Radio afterglow detection
  46. GRB 090323: TLS detection at 5 days, no break
  47. GRB 090327: Fermi GBM detection
  48. GRB 090323 TLS detection - still bright
  49. GRB 090323: UVOT Detection of Afterglow
  50. GRB 090323: Swift-XRT refined analysis
  51. GRB 090323: GROND Detection of the Afterglow and Photo-z
  52. GRB 090323: Possible XRT Counterpart
  53. GRB 090320C: Fermi GBM Detection
  54. GRB 090320B: Fermi GBM detection.
  55. GRB 090319: Fermi GBM detection
  56. GRB 090320A: Fermi GBM detection
  57. GRB 090313: WSRT Radio Detection
  58. X-shooter observations of GRB 090313
  59. GRB 090313: VLT spectroscopy
  60. GRB090313: radio detection with the VLA
  61. IPN Triangulation of GRB090315 and Tupi Detection of Muon Increase
  62. Further Swift/UVOT observations of GRB 090313
  63. GRB 090313: detection with CARMA in 3mm band
  64. Radio detection of GRB090313
  65. GRB 090313: TAROT La Silla observatory optical detection
  66. GRB 090313: Zadko Telescope observations
  67. GRB 090313 - PAIRITEL NIR detections
  68. GRB 090313 optical observations
  69. GRB 090313: Swift-XRT refined analysis
  70. GRB 090313: Swift/UVOT upper limits
  71. GRB 090313: Faulkes Telescope North observations
  72. GRB 090306B: Confirmation of the X-ray afterglow
  73. GRB 090313: Swift-BAT refined analysis
  74. GRB 090313, GROND observations
  75. GRB 090309, Swift-BAT lag analysis
  76. GRB 090313: Swift detection of a burst
  77. GRB 090313: Swift detection of a burst
  78. Swift trigger 346250 is probably not a burst
  79. GRB090310: Fermi GBM detection
  80. GRB 090309A: GROND upper limits
  81. GRB 090307A: TAROT Calern observatory optical observations
  82. GRB 090309: Swift/UVOT Upper Limits
  83. GRB090305B: Fermi GBM detection
  84. GRB 090309B: Fermi GBM detection
  85. GRB 090309: Swift-XRT refined analysis
  86. GRB 090309: Enhanced Swift-XRT position
  87. GRB 090306B: INTEGRAL SPI-ACS light curve
  88. GRB 090309, Swift-BAT refined analysis
  89. GRB 090308: GROND observations
  90. GRB 090308: Gemini GMOS Observations
  91. GRB 090309: Swift detection of a burst
  92. GRB 090308B: Fermi GBM detection
  93. GRB 090308: Swift/UVOT Upper Limits
  94. GRB 090307B: Fermi GBM detection
  95. GRB 090306C: Fermi GBM detection
  96. GRB 090307: GROND Upper Limits
  97. GRB 090306B: GROND Upper Limits
  98. GRB 090305C: Suzaku WAM observation of the prompt emission
  99. GRB 090308: Swift-XRT refined analysis
  100. Radio observation of GRB 081007 with ATCA

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