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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"

36356 results found.

  1. GRB 051022: Spectral Analysis Indicates That The Spectrum Is Absorbed
  2. GRB 051021: Correction
  3. GRB 051022, J & K-band observation
  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. GRB 051021B: Refined analysis of the Swift-BAT burst
  11. GRB 051022: SSO40 Optical Observations
  12. GRB 051022A: ROTSE-III Optical Limits
  13. GRB051022 (=H3590), A GRB Detected By HETE
  14. GRB 051022: Optical observations
  15. GRB 051021,optical observation
  16. GRB051021B: Swift XRT Position
  17. GRB 051021: SOAR NIR Observations
  18. GRB 051021B: Swift detection of a burst
  19. GRB051021 (=H3947): Refined Analysis
  20. GRB 051021 : optical afterglow observation at Lulin
  21. GRB 051021: Optical observations
  22. GRB 051021: ROTSE-III Confirmation of Optical Counterpart
  23. GRB 051021: Optical observations and candidate afterglow
  24. GRB051021.63
  25. GRB051021.6: MASTER optical observation
  26. Swift-BAT trigger 160640 is not a real GRB
  27. GRB051021: A GRB Localized by HETE
  28. Swift-BAT trigger 160619 is not a GRB
  29. Swift-BAT triggered on a posible CR Shower or possible GRB
  30. GRB 050502b: Optical limit
  31. GRB 051016b: Optical limit
  32. Afterglow candidate of GRB 051016B observed at Lulin
  33. GRB 051016b: Gemini Near IR Observations
  34. GRB 051016A: Swift/UVOT upper limits
  35. GRB 051016B: refined analysis of the Swift/XRT data
  36. GRB 051016B: Swift/UVOT detection
  37. GRB 051016B,optical observation
  38. GRB 051016B : Optical follow-up at Lulin
  39. GRB 051016B: Refined analysis of the Swift-BAT burst
  40. GRB 051016B: Swift detection of a soft burst
  41. GRB 051016: Swift-BAT refined analysis
  42. GRB051016: Swift XRT refined analysis.
  43. GRB 051016: LCO optical and near-IR imaging
  44. GRB 051016: PROMPT Observations
  45. GRB051016: Swift detection of a burst
  46. Photometric calibration of Swift/UVOT and Re-analysis of Swift/UVOT GRB 050922C data
  47. GRB051006: optical observations
  48. GRB 051012: Swift-BAT detection of burst yesterday
  49. Swift trigger 159578 is not a burst
  50. GRB 051006: Swift/UVOT Upper Limits
  51. IBAS Alert 2675 : not a GRB
  52. GRB051008: optical candidate
  53. GRB 051008: - a high redshift high-luminosity burst?
  54. GRB 051008 - a low redshift low-luminosity burst?
  55. IBAS Alert 2673: not a real GRB
  56. GRB051011: MASTER optical observation
  57. GRB051008: optical observation
  58. GRB051008: Swift XRT refined analysis
  59. GRB051008 - Swift UVOT upper limits
  60. Konus-Wind observation of GRB 051008
  61. GRB051008: Final refined analysis of the Swift-BAT burst
  62. GRB 051008: R-band upper limit
  63. GRB051008: Radio Observation
  64. GRB 051008: Swift XRT position
  65. GRB 051008, optical observations
  66. GRB 051008: early Swift XRT analysis
  67. GRB 051008: Swift UVOT Candidate
  68. GRB 051006: P60 Observations
  69. grb test
  70. GRB 051006: XRT refined analysis
  71. GRB 051006: optical observations at Sierra Nevada
  72. GRB 051006: XRT position
  73. GRB 050906, summary of radio observations
  74. GRB 050925: Second Epoch WSRT Radio Observations
  75. GRB 051001: Swift XRT refined analysis
  76. GRB 051001, optical observations at Mt. John
  77. GRB 051001: I-band limit
  78. GRB 051001: AAT infra-red observations
  79. GRB 051001: Swift-BAT refined analysis
  80. GRB 051001: Swift Detection of a Burst
  81. GRB 051001: ROTSE-III Optical Limits
  82. GRB050908: optical observations
  83. GRB050922C: optical observation
  84. GRB050922B: optical limit
  85. GRB 050922C: further VLT observations
  86. GRB 050820A: NIR photometry at the TNG
  87. GRB050922C: UVES/VLT high resolution spectroscopy
  88. GRB050925: Swift/XRT limits
  89. GRB/SGR 050925: IR Observations
  90. GRB 050922C: break in the lightcurve
  91. GRB 050925: WSRT Radio Observations
  92. GRB 050925 : I-band observation at Xinglong observatory
  93. GRB050925: Faulkes Telescope North R-band limit
  94. GRB050925: Swift-BAT detection of a short burst
  95. GRB 050922B: Correction to BAT refined analysis, longer burst
  96. GRB050922C: TNG spectroscopic observations
  97. GRB050922B: refined XRT analysis
  98. Konus-Wind observation of GRB 050922C
  99. GRB 050922C: Refined redshift
  100. GRB OT observation

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