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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"

26511 results found.

  1. GRB051022: Radio Counterpart
  2. GRB051021A: Swift XRT refined analysis
  3. Konus-Wind observation of GRB 051022
  4. GRB 051021, SMARTS optical/IR observations
  5. GRB 051021: P200 Ks Observations
  6. IPN triangulation of GRB051022 (=H3950)
  7. GRB 051021: MDM Upper Limit
  8. GRB 051022 (=H3950): SXC Flight Localization is Valid
  9. GRB051021: Swift/UVOT Upper Limits
  10. GRB051022 (=H3590), A GRB Detected By HETE
  11. GRB 051022: Optical observations
  12. GRB 051021,optical observation
  13. GRB051021: Swift XRT analysis
  14. GRB051021 (=H3947): Refined Analysis
  15. GRB 051021 : optical afterglow observation at Lulin
  16. GRB 051021: Optical observations
  17. GRB 051021: ROTSE-III Confirmation of Optical Counterpart
  18. GRB051021.63
  19. GRB051021.6: MASTER optical observation
  20. GRB051021: A GRB Localized by HETE
  21. Swift-BAT trigger 160619 is not a GRB
  22. GRB 050502b: Optical limit
  23. GRB 051016b: Optical limit
  24. Afterglow candidate of GRB 051016B observed at Lulin
  25. GRB 051016b: Gemini Near IR Observations
  26. GRB 051016B: refined analysis of the Swift/XRT data
  27. GRB 051016B: Swift/UVOT detection
  28. GRB 051016B: Swift detection of a soft burst
  29. GRB051016: Swift XRT refined analysis.
  30. GRB051016: Planned XMM-Newton observation
  31. GRB051016: Swift detection of a burst
  32. Photometric calibration of Swift/UVOT and Re-analysis of Swift/UVOT GRB 050922C data
  33. GRB051006: optical observations
  34. Swift-BAT Trigger 159578 is a possible burst
  35. GRB050805A: Rc optical observations
  36. GRB 051008: - a high redshift high-luminosity burst?
  37. GRB 051008 - a low redshift low-luminosity burst?
  38. GRB051011: bright nebulae near error box
  39. GRB051011: MASTER optical observation
  40. GRB051008: Swift XRT refined analysis
  41. Konus-Wind observation of GRB 051008
  42. GRB 051008: R-band upper limit
  43. GRB051008: Radio Observation
  44. GRB 051008, optical observations
  45. GRB051008: Swift-BAT detection of a bright burst
  46. GRB 051006: P60 Observations
  47. GRB 051006: XRT refined analysis
  48. GRB 050906, summary of radio observations
  49. GRB 051001: Swift XRT refined analysis
  50. GRB 051001, optical observations at Mt. John
  51. GRB050908: optical observations
  52. GRB 050922C: further VLT observations
  53. GRB 050820A: NIR photometry at the TNG
  54. GRB050922C: UVES/VLT high resolution spectroscopy
  55. GRB050925: Swift/XRT limits
  56. GRB/SGR 050925: IR Observations
  57. GRB 050922B: Correction to BAT refined analysis, longer burst
  58. GRB050922B: refined XRT analysis
  59. Konus-Wind observation of GRB 050922C
  60. GRB OT observation
  61. GRB050922C: observation at MonteBoo
  62. GRB 050922B: optical limit
  63. GRB050922C: Optical Observations
  64. GRB 050922C: Swift XRT refined analysis
  65. GRB050922C: optical observations
  66. GRB 050922C: optical obserations
  67. GRB 050922C: Swift detection of a bright burst
  68. GRB 050922C: ROTSE-IIId Refined Analysis
  69. Possible GRB 050922 detected by INTEGRAL
  70. GRB050820B: analysis of the XMM-Newton observation
  71. GRB 050916: Swift-BAT refined analysis
  72. GRB 050918 - A long GRB detected by INTEGRAL
  73. GRB 050915a: Radio Observations
  74. GRB050916 : Swift-XRT refined analysis
  75. GRB 050915B: Swift-BAT refined analysis
  76. GRB 050915a: IR Transient
  77. GRB 050915: Swift XRT refined analysis
  78. GRB 050915: Swift-BAT refined analysis
  79. GRB050915, optical observations
  80. Swift is in normal operation
  81. GRB050911: Swift UVOT followup observations
  82. GRB 050911, optical observations
  83. GRB 050911: Swift-BAT refined analysis
  84. GRB 050911: z~0.16 cluster in the field
  85. GRB050908: detection of Swift/UVOT optical counterpart
  86. GRB 050910a: TAROT early optical limits
  87. RBO GRB 050908 observations
  88. WIRO observations in I of GRB 050908
  89. GRB 050906: Possible X-ray Counterpart
  90. GRB050908: Swift/UVOT Early upper limits
  91. GRB050908 : Swift-XRT refined analysis
  92. GRB 050908: Swift-BAT refined analysis
  93. GRB 050908: Optical observations
  94. Gemini Spectroscopy of GRB 050908
  95. GRB 050908: KAIT observations
  96. GRB 050908: P60 Confirmation of Optical Afterglow
  97. GRB 050908: Optical Observations
  98. GRB 050906: Optical observations at the Very Large Telescope
  99. GRB 050906: Swift-BAT refined analysis
  100. GRB 050906: Swift XRT upper limit

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