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GCN Circulars

GCN Circulars are rapid bulletins submitted by and distributed to the community. 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"

28101 results found.

  1. GRB 090404: millimeter detection
  2. GRB 090405: Fermi GBM Detection
  3. GRB 090403: Fermi GBM detection
  4. GRB 090404: GROND upper limits
  5. GRB 090404: further NOT observations
  6. Swift/UVOT observations of GRB090404
  7. GRB 090404: NOT observations
  8. GRB 090404: Swift-XRT Team refined analysis
  9. GRB 090404: Swift-BAT refined analysis
  10. GRB 090404: Enhanced Swift-XRT position
  11. GRB 090404: Swift detection of a burst
  12. GRB 090401A: Suzaku WAM observation of the prompt emission
  13. GRB 090401B: Suzaku WAM observation of the prompt emission
  14. GRB 090401B: Xinglong TNT optical Upper Limit
  15. GRB 090401B: VLA radio upper limit
  16. GRB 090401B: Upper limits of MITSuME optical observation
  17. GRB090401B, RIMOTS optical upper limits
  18. GRB 090401B: AGILE refined analysis
  19. GRB 090401B: Swift XRT Refined Analysis
  20. GRB 090331: Fermi GBM detection
  21. Konus-Wind observation of GRB 090401A
  22. GRB 090401B: Enhanced Swift-XRT position
  23. AGILE Gamma-ray detection of GRB 090401B
  24. GRB 090401B: Swift-BAT refined analysis
  25. GRB 090401B: Swift detection of a burst
  26. GRB 090328B: MASTER-Irkutsk prompt optical short burst observations
  27. GRB 090401, Swift-BAT refined analysis
  28. GRB 090323: Further TLS detections - a break?
  29. GRB 090324: Suzaku WAM observation of the prompt emission
  30. GRB 090328: Radio afterglow detection
  31. GRB 090326: Fermi GBM detection
  32. GRB 090328: Fermi GBM Spectral Analysis
  33. GRB 090328B: Fermi GBM Detection
  34. GRB 090330: Fermi GBM detection
  35. GRB 090328: GROND Detection of the Optical/NIR Afterglow
  36. GRB 090328: Swift XRT refined analysis
  37. GRB090323: Optical observations from NOT
  38. GRB 090328: Swift UVOT observations
  39. GRB 090328: Updated position/optical afterglow candidate
  40. Fermi LAT and GBM detections of GRB090328
  41. GRB 090323: Radio afterglow detection
  42. GRB 090327: Fermi GBM detection
  43. GRB 090320B: MASTER-Net prompt optical observations
  44. GRB 090323: Fermi GBM Spectral Analysis
  45. GRB 090323: UVOT Detection of Afterglow
  46. GRB 090324: SuperAGILE Localization of a Long GRB
  47. GRB 090323: P60 Afterglow Confirmation
  48. GRB 090323: GROND Detection of the Afterglow and Photo-z
  49. GRB 090323: Possible XRT Counterpart
  50. GRB 090320C: Fermi GBM Detection
  51. GRB 090320B: Fermi GBM detection.
  52. GRB 090319: Fermi GBM detection
  53. GRB 090320A: Fermi GBM detection
  54. Further 15GHz observations of GRB090313
  55. X-shooter observations of GRB 090313
  56. A bright burst from AXP 1E 1547.0-5408/SGR J1550-5418
  57. GRB 090315: Suzaku WAM observation of the prompt emission
  58. GRB090313: radio detection with the VLA
  59. IPN Triangulation of GRB090315 and Tupi Detection of Muon Increase
  60. Further radio observation of GRB 090313
  61. GRB 090313: detection with CARMA in 3mm band
  62. GRB090305B: MASTER-net prompt optical short burst observations
  63. GRB 090313: MITSuME Okayama observation
  64. GRB 090313: Additional Gemini-S photometry
  65. GRB 090313: TAROT La Silla observatory optical detection
  66. GRB 090313: Zadko Telescope observations
  67. GRB 090313 optical observations
  68. GRB 090313: Ongoing plateau phase
  69. GRB 090313: Swift-XRT refined analysis
  70. GRB 090313: Swift/UVOT upper limits
  71. GRB 090313: Swift-BAT refined analysis
  72. GRB 090313, GROND observations
  73. GRB 090309, Swift-BAT lag analysis
  74. Swift trigger 346250 is probably not a burst
  75. GRB090310: Fermi GBM detection
  76. GRB 090205: Zadko Telescope late-time observations
  77. GRB 090309A: GROND upper limits
  78. GRB 090307A: TAROT Calern observatory optical observations
  79. GRB 090309: Swift/UVOT Upper Limits
  80. GRB090305B: Fermi GBM detection
  81. GRB 090309B: Fermi GBM detection
  82. GRB 090309: Swift-XRT refined analysis
  83. GRB 090309: Enhanced Swift-XRT position
  84. GRB 090309, Swift-BAT refined analysis
  85. GRB 090308: GROND observations
  86. GRB 090308: Gemini GMOS Observations
  87. GRB 090309: Swift detection of a burst
  88. GRB 090308B: Fermi GBM detection
  89. GRB 090308: Swift/UVOT Upper Limits
  90. GRB 090307B: Fermi GBM detection
  91. GRB 090306C: Fermi GBM detection
  92. GRB 090307: GROND Upper Limits
  93. GRB 090306B: GROND Upper Limits
  94. GRB 090308: Swift-XRT refined analysis
  95. Radio observation of GRB 090201 with ATCA
  96. Radio observation of GRB 090117 with ATCA
  97. Radio observation of GRB 081226b with ATCA
  98. Radio observation of GRB 081226a with ATCA
  99. Radio observation of GRB 081007 with ATCA
  100. GRB 090308: Swift-BAT refined analysis

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