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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"

27320 results found.

  1. GRB 090411A: Fermi GBM detection
  2. GRB 090410: Suzaku WAM observation of the prompt emission
  3. GRB 090410: GROND upper limits
  4. GRB 090410: MITSuME optical upper limits
  5. GRB 090408b: IPN Triangulation
  6. GRB 090328b: IPN Triangulation
  7. GRB 090410: Swift-BAT refined analysis
  8. GRB 090409: Fermi GBM detection
  9. GRB090408, RIMOTS optical upper limits
  10. Swift-BAT trigger 348781: almost certainly not a burst
  11. GRB 090408B: MASTER II-Kourovka optical observations
  12. GRB 090407: GROND upper limits
  13. GRB 090407: VLT observations
  14. GRB 090407: Swift-XRT refined analysis
  15. GRB 090407: Swift UVOT Upper Limits
  16. GRB 090407: Enhanced Swift-XRT position
  17. GRB 090407: Swift-BAT refined analysis
  18. GRB 090407: ROTSE-III Optical Limits
  19. GRB 090407: Swift detection of a burst
  20. GRB 090404: millimeter detection
  21. GRB 090405: Fermi GBM Detection
  22. GRB 090403: Fermi GBM detection
  23. GRB 090404: GROND upper limits
  24. GRB 090404: further NOT observations
  25. Swift/UVOT observations of GRB090404
  26. GRB 090404: NOT observations
  27. GRB 090404: Swift-XRT Team refined analysis
  28. GRB 090404: Swift-BAT refined analysis
  29. GRB 090404: Enhanced Swift-XRT position
  30. GRB 090404: Swift detection of a burst
  31. GRB 090401A: Suzaku WAM observation of the prompt emission
  32. GRB 090401B: Suzaku WAM observation of the prompt emission
  33. GRB 090401B: Xinglong TNT optical Upper Limit
  34. GRB 090401B: VLA radio upper limit
  35. GRB 090401B: Upper limits of MITSuME optical observation
  36. GRB090401B, RIMOTS optical upper limits
  37. GRB 090401B: AGILE refined analysis
  38. GRB 090401B: Swift XRT Refined Analysis
  39. GRB 090331: Fermi GBM detection
  40. Konus-Wind observation of GRB 090401A
  41. GRB 090401B: Enhanced Swift-XRT position
  42. AGILE Gamma-ray detection of GRB 090401B
  43. GRB 090401B: Swift-BAT refined analysis
  44. GRB 090401B: Swift detection of a burst
  45. GRB 090328B: MASTER-Irkutsk prompt optical short burst observations
  46. GRB 090401, Swift-BAT refined analysis
  47. GRB 090323: Further TLS detections - a break?
  48. GRB 090324: Suzaku WAM observation of the prompt emission
  49. GRB 090328: Radio afterglow detection
  50. GRB 090326: Fermi GBM detection
  51. GRB 090328: Fermi GBM Spectral Analysis
  52. GRB 090328B: Fermi GBM Detection
  53. GRB 090330: Fermi GBM detection
  54. GRB 090328: GROND Detection of the Optical/NIR Afterglow
  55. GRB 090328: Swift XRT refined analysis
  56. GRB090323: Optical observations from NOT
  57. GRB 090328: Swift UVOT observations
  58. GRB 090328: Updated position/optical afterglow candidate
  59. Fermi LAT and GBM detections of GRB090328
  60. GRB 090323: Radio afterglow detection
  61. GRB 090327: Fermi GBM detection
  62. GRB 090320B: MASTER-Net prompt optical observations
  63. GRB 090323: Fermi GBM Spectral Analysis
  64. GRB 090323: UVOT Detection of Afterglow
  65. GRB 090324: SuperAGILE Localization of a Long GRB
  66. GRB 090323: P60 Afterglow Confirmation
  67. GRB 090323: GROND Detection of the Afterglow and Photo-z
  68. GRB 090323: Possible XRT Counterpart
  69. GRB 090320C: Fermi GBM Detection
  70. GRB 090320B: Fermi GBM detection.
  71. GRB 090319: Fermi GBM detection
  72. GRB 090320A: Fermi GBM detection
  73. Further 15GHz observations of GRB090313
  74. X-shooter observations of GRB 090313
  75. A bright burst from AXP 1E 1547.0-5408/SGR J1550-5418
  76. GRB 090315: Suzaku WAM observation of the prompt emission
  77. GRB090313: radio detection with the VLA
  78. IPN Triangulation of GRB090315 and Tupi Detection of Muon Increase
  79. Further radio observation of GRB 090313
  80. GRB 090313: detection with CARMA in 3mm band
  81. GRB090305B: MASTER-net prompt optical short burst observations
  82. GRB 090313: MITSuME Okayama observation
  83. GRB 090313: Additional Gemini-S photometry
  84. GRB 090313: TAROT La Silla observatory optical detection
  85. GRB 090313: Zadko Telescope observations
  86. GRB 090313 optical observations
  87. GRB 090313: Ongoing plateau phase
  88. GRB 090313: Swift-XRT refined analysis
  89. GRB 090313: Swift/UVOT upper limits
  90. GRB 090313: Swift-BAT refined analysis
  91. GRB 090313, GROND observations
  92. GRB 090309, Swift-BAT lag analysis
  93. Swift trigger 346250 is probably not a burst
  94. GRB090310: Fermi GBM detection
  95. GRB 090205: Zadko Telescope late-time observations
  96. GRB 090309A: GROND upper limits
  97. GRB 090307A: TAROT Calern observatory optical observations
  98. GRB 090309: Swift/UVOT Upper Limits
  99. GRB090305B: Fermi GBM detection
  100. GRB 090309B: Fermi GBM detection

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