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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"

42004 results found.

  1. GRB 051021: Correction
  2. GRB 051022, J & K-band observation
  3. GRB 051021, SMARTS optical/IR observations
  4. GRB051022: Swift XRT Position
  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. GRB051022,optical observation
  13. GRB 051022A: ROTSE-III Optical Limits
  14. GRB051022 (=H3590), A GRB Detected By HETE
  15. GRB 051022: Optical observations
  16. GRB051021B: Swift XRT Position
  17. GRB 051021: SOAR NIR Observations
  18. GRB 051021B: Swift detection of a burst
  19. GRB051021: Swift XRT analysis
  20. GRB051021 (=H3947): Refined Analysis
  21. GRB 051021 : optical afterglow observation at Lulin
  22. GRB 051021: Optical observations
  23. GRB 051021: ROTSE-III Confirmation of Optical Counterpart
  24. GRB 051021: Optical observations and candidate afterglow
  25. GRB051021.63
  26. GRB051021.6: MASTER optical observation
  27. Swift-BAT trigger 160640 is not a real GRB
  28. GRB051021: A GRB Localized by HETE
  29. Swift-BAT trigger 160619 is not a GRB
  30. Swift-BAT triggered on a posible CR Shower or possible GRB
  31. GRB 050502b: Optical limit
  32. GRB 051016b: Optical limit
  33. Afterglow candidate of GRB 051016B observed at Lulin
  34. GRB 051016b: Gemini Near IR Observations
  35. GRB 051016A: Swift/UVOT upper limits
  36. GRB 051016B: refined analysis of the Swift/XRT data
  37. GRB 051016B: Swift/UVOT detection
  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 XMM-Newton observation
  43. GRB051016: Swift XRT refined analysis.
  44. GRB051016: Planned XMM-Newton observation
  45. GRB 051016: LCO optical and near-IR imaging
  46. GRB 051016: PROMPT Observations
  47. GRB051016: Swift detection of a burst
  48. Photometric calibration of Swift/UVOT and Re-analysis of Swift/UVOT GRB 050922C data
  49. GRB051006: optical observations
  50. GRB 051012: Swift-BAT detection of burst yesterday
  51. Swift trigger 159578 is not a burst
  52. Swift-BAT Trigger 159578 is a possible burst
  53. GRB050805A: Rc optical observations
  54. GRB 051006: Swift/UVOT Upper Limits
  55. GRB051008: optical candidate
  56. GRB 051008 - a low redshift low-luminosity burst?
  57. GRB051011: MASTER optical observation
  58. GRB051008: optical observation
  59. GRB051008: Swift XRT refined analysis
  60. GRB051008 - Swift UVOT upper limits
  61. Konus-Wind observation of GRB 051008
  62. GRB051008: Final refined analysis of the Swift-BAT burst
  63. GRB 051008: R-band upper limit
  64. GRB051008: Refined analysis of the Swift-BAT burst
  65. GRB051008: Radio Observation
  66. GRB 051008: Swift XRT position
  67. GRB 051008, optical observations
  68. GRB 051008: early Swift XRT analysis
  69. GRB 051008: Swift UVOT Candidate
  70. GRB051008: Swift-BAT detection of a bright burst
  71. GRB 051006: P60 Observations
  72. GRB 051006: XRT refined analysis
  73. Swift-BAT trigger 158700 is a probable Cosmic Ray Shower Event
  74. GRB 051006: optical observations at Sierra Nevada
  75. GRB051006: Refined analysis of the Swift-BAT burst
  76. GRB 051006: XRT position
  77. GRB051006: Swift detection of a burst
  78. GRB 050906, summary of radio observations
  79. Swift-BAT triggers 158261 and 158262 Retraction
  80. GRB051001: Swift UVOT Upper Limits
  81. GRB 050925: Second Epoch WSRT Radio Observations
  82. GRB 051001: Swift XRT refined analysis
  83. GRB 051001, optical observations at Mt. John
  84. GRB 051001: I-band limit
  85. GRB 051001: AAT infra-red observations
  86. GRB 051001: Swift-BAT refined analysis
  87. GRB 051001: Swift Detection of a Burst
  88. GRB 051001: ROTSE-III Optical Limits
  89. GRB050908: optical observations
  90. GRB050922C: optical observation
  91. GRB050922B: optical limit
  92. GRB 050922C: further VLT observations
  93. GRB 050820A: NIR photometry at the TNG
  94. GRB050922C: UVES/VLT high resolution spectroscopy
  95. GRB050925: Swift/XRT limits
  96. GRB/SGR 050925: IR Observations
  97. GRB050922C - Swift UVOT preliminary analysis
  98. GRB 050922C: break in the lightcurve
  99. GRB 050925: WSRT Radio Observations
  100. GRB050925: Swift UVOT upper limits

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