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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"

32757 results found.

  1. GRB051028: optical observations
  2. GRB051028: Swift/UVOT upper limits
  3. GRB051028: WHT optical candidate
  4. GRB051028: Swift XRT Position
  5. GRB051028:MASTER observations
  6. GRB 051022: XRT Refined Spectral and Temporal Analysis--Correction
  7. GRB051022: Swift XRT measurement of jet break
  8. GRB051021B: Swift/UVOT Upper limits
  9. GRB 051022: XRT Refined Spectral and Temporal Analysis
  10. GRB 051022, refined optical astrometry
  11. Chandra Observations of GRB 051022
  12. GRB051012: Swift-XRT analysis
  13. GRB051021B: Swift XRT refined analysis
  14. GRB051021a: optical observations
  15. GRB 051022: WSRT Radio Detection
  16. GRB 051022, mm counterpart
  17. GRB051022: host galaxy redshift
  18. GRB 051022: Swift/UVOT Upper Limits
  19. GRB051022: Radio Counterpart
  20. GRB051022: IR observations
  21. GRB 051022: SOAR JKs Observations
  22. GRB051021A: Swift XRT refined analysis
  23. Konus-Wind observation of GRB 051022
  24. GRB051022: Optical Observations
  25. GRB 051022: Magellan NIR imaging
  26. GRB 051021: PROMPT RcIc Observations
  27. GRB051021b: Magellan IR Imaging
  28. GRB 051021: Correction
  29. GRB 051022, J & K-band observation
  30. GRB 051021, SMARTS optical/IR observations
  31. GRB051022: Swift XRT Position
  32. GRB 051021: P200 Ks Observations
  33. IPN triangulation of GRB051022 (=H3950)
  34. GRB 051021: MDM Upper Limit
  35. GRB 051022 (=H3950): SXC Flight Localization is Valid
  36. GRB051021: Swift/UVOT Upper Limits
  37. GRB 051021B: Refined analysis of the Swift-BAT burst
  38. GRB 051022: SSO40 Optical Observations
  39. GRB 051022A: ROTSE-III Optical Limits
  40. GRB051022 (=H3590), A GRB Detected By HETE
  41. GRB 051022: Optical observations
  42. GRB051021B: Swift XRT Position
  43. GRB 051021: SOAR NIR Observations
  44. GRB051021: Swift XRT analysis
  45. GRB 051021 : optical afterglow observation at Lulin
  46. GRB 051021: Optical observations
  47. GRB 051021: ROTSE-III Confirmation of Optical Counterpart
  48. GRB 051021: Optical observations and candidate afterglow
  49. GRB051021: A GRB Localized by HETE
  50. GRB 050502b: Optical limit
  51. GRB 051016b: Optical limit
  52. Afterglow candidate of GRB 051016B observed at Lulin
  53. GRB 051016b: Gemini Near IR Observations
  54. GRB 051016A: Swift/UVOT upper limits
  55. GRB 051016B: refined analysis of the Swift/XRT data
  56. GRB 051016B: Swift/UVOT detection
  57. GRB 051016B : Optical follow-up at Lulin
  58. GRB 051016B: Refined analysis of the Swift-BAT burst
  59. GRB 051016: Swift-BAT refined analysis
  60. GRB051016: Planned XMM-Newton observation
  61. GRB 051016: LCO optical and near-IR imaging
  62. GRB 051016: PROMPT Observations
  63. Photometric calibration of Swift/UVOT and Re-analysis of Swift/UVOT GRB 050922C data
  64. GRB051006: optical observations
  65. Swift trigger 159578 is not a burst
  66. GRB050805A: Rc optical observations
  67. GRB 051006: Swift/UVOT Upper Limits
  68. GRB051008: optical candidate
  69. GRB 051008 - a low redshift low-luminosity burst?
  70. GRB051008: Swift XRT refined analysis
  71. GRB051008 - Swift UVOT upper limits
  72. Konus-Wind observation of GRB 051008
  73. GRB051008: Final refined analysis of the Swift-BAT burst
  74. GRB 051008: R-band upper limit
  75. GRB051008: Refined analysis of the Swift-BAT burst
  76. GRB051008: Radio Observation
  77. GRB 051008: Swift XRT position
  78. GRB 051008, optical observations
  79. GRB 051006: P60 Observations
  80. GRB 051006: XRT refined analysis
  81. GRB051006: Refined analysis of the Swift-BAT burst
  82. GRB 051006: XRT position
  83. GRB 050906, summary of radio observations
  84. Swift-BAT triggers 158261 and 158262 Retraction
  85. GRB051001: Swift UVOT Upper Limits
  86. GRB 050925: Second Epoch WSRT Radio Observations
  87. GRB 051001: Swift XRT refined analysis
  88. GRB 051001, optical observations at Mt. John
  89. GRB 051001: I-band limit
  90. GRB 051001: AAT infra-red observations
  91. GRB 051001: Swift-BAT refined analysis
  92. GRB 051001: ROTSE-III Optical Limits
  93. GRB050908: optical observations
  94. GRB050922B: optical limit
  95. GRB 050922C: further VLT observations
  96. GRB 050820A: NIR photometry at the TNG
  97. GRB050922C: UVES/VLT high resolution spectroscopy
  98. GRB050925: Swift/XRT limits
  99. GRB/SGR 050925: IR Observations
  100. GRB050922C - Swift UVOT preliminary analysis

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