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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"

25778 results found.

  1. VLA observations of short burst GRB 090417A
  2. GRB 090418B: Detection of a bright burst from Swift-BAT slew data
  3. GRB 090417B: Gemini imaging
  4. GRB 090417B: Galaxy redshift
  5. GRB 090417B: Swift-XRT refined analysis
  6. GRB 090418: Enhanced Swift-XRT position
  7. GRB 090418: Swift detection of a burst with optical afterglow
  8. GRB 090411B: Suzaku WAM observation of the prompt emission
  9. GRB 090411A: Suzaku WAM observation of the prompt emission
  10. GRB 090417B: Subaru NIR Observations
  11. GRB 090417B: MITSuME Okayama optical upper limits
  12. GRB 090417B: optical observations
  13. GRB090417B: optical observations
  14. GRB 090417B: Swift detection of a burst
  15. GRB 090412: Fermi GBM detection
  16. GRB 090411B: Fermi GBM detection
  17. GRB 090411A: Fermi GBM detection
  18. GRB 090410: Suzaku WAM observation of the prompt emission
  19. GRB 090410: GROND upper limits
  20. GRB 090410: MITSuME optical upper limits
  21. GRB 090408b: IPN Triangulation
  22. GRB 090328b: IPN Triangulation
  23. GRB090408 : TAOS optical observations
  24. GRB 090409: Fermi GBM detection
  25. GRB090408, RIMOTS optical upper limits
  26. Swift-BAT trigger 348781: almost certainly not a burst
  27. GRB 090408B: MASTER II-Kourovka optical observations
  28. GRB 090407: GROND upper limits
  29. GRB 090407: VLT observations
  30. GRB 090407: Swift-XRT refined analysis
  31. GRB 090407: Swift UVOT Upper Limits
  32. GRB 090407: Enhanced Swift-XRT position
  33. GRB 090407: Swift-BAT refined analysis
  34. Konus-Wind and Konus-RF observations of GRB 090406
  35. GRB 090407: ROTSE-III Optical Limits
  36. GRB 090407: Swift detection of a burst
  37. GRB 090405: Fermi GBM Detection
  38. GRB 090403: Fermi GBM detection
  39. GRB 090404: GROND upper limits
  40. GRB 090404: further NOT observations
  41. Swift/UVOT observations of GRB090404
  42. GRB 090404: NOT observations
  43. GRB 090404: Swift-XRT Team refined analysis
  44. GRB 090404: Enhanced Swift-XRT position
  45. GRB 090404: Swift detection of a burst
  46. GRB 090401A: Suzaku WAM observation of the prompt emission
  47. GRB 090401B: Suzaku WAM observation of the prompt emission
  48. GRB 090401B: VLA radio upper limit
  49. GRB 090401B: Upper limits of MITSuME optical observation
  50. GRB090401B, RIMOTS optical upper limits
  51. GRB 090401B: AGILE refined analysis
  52. GRB 090401B: Swift XRT Refined Analysis
  53. GRB 090331: Fermi GBM detection
  54. Konus-Wind observation of GRB 090401A
  55. GRB 090401B: Enhanced Swift-XRT position
  56. AGILE Gamma-ray detection of GRB 090401B
  57. GRB 090401B: Swift detection of a burst
  58. GRB 090328B: MASTER-Irkutsk prompt optical short burst observations
  59. GRB 090324: Suzaku WAM observation of the prompt emission
  60. GRB 090328: Radio afterglow detection
  61. GRB 090326: Fermi GBM detection
  62. GRB 090328: Fermi GBM Spectral Analysis
  63. GRB 090328B: Fermi GBM Detection
  64. GRB 090330: Fermi GBM detection
  65. GRB 090328: GROND Detection of the Optical/NIR Afterglow
  66. GRB 090328: Swift XRT refined analysis
  67. GRB090323: Optical observations from NOT
  68. GRB 090328: Swift UVOT observations
  69. GRB 090328: Updated position/optical afterglow candidate
  70. GRB 090323: Radio afterglow detection
  71. GRB 090327: Fermi GBM detection
  72. GRB 090323: Faulkes Telescope South Observations
  73. GRB 090320B: MASTER-Net prompt optical observations
  74. GRB 090323: Fermi GBM Spectral Analysis
  75. GRB 090323: UVOT Detection of Afterglow
  76. GRB 090323: Swift-XRT refined analysis
  77. GRB 090324: SuperAGILE Localization of a Long GRB
  78. GRB 090323: P60 Afterglow Confirmation
  79. GRB 090323: GROND Detection of the Afterglow and Photo-z
  80. GRB 090323: Possible XRT Counterpart
  81. GRB 090320C: Fermi GBM Detection
  82. GRB 090320B: Fermi GBM detection.
  83. GRB 090319: Fermi GBM detection
  84. GRB 090320A: Fermi GBM detection
  85. Further 15GHz observations of GRB090313
  86. X-shooter observations of GRB 090313
  87. A bright burst from AXP 1E 1547.0-5408/SGR J1550-5418
  88. GRB 090315: Suzaku WAM observation of the prompt emission
  89. GRB 090313: VLT spectroscopy
  90. GRB090313: radio detection with the VLA
  91. IPN Triangulation of GRB090315 and Tupi Detection of Muon Increase
  92. Further radio observation of GRB 090313
  93. GRB 090313: detection with CARMA in 3mm band
  94. GRB090305B: MASTER-net prompt optical short burst observations
  95. GRB 090313: MITSuME Okayama observation
  96. GRB 090313: Additional Gemini-S photometry
  97. GRB 090313: TAROT La Silla observatory optical detection
  98. GRB 090313: Zadko Telescope observations
  99. GRB 090313: Ongoing plateau phase
  100. GRB 090313: Swift-XRT refined analysis

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