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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"

32763 results found.

  1. GRB051016B: optical observation
  2. Konus-Wind observation of GRB 051028
  3. GRB051028:MASTER correction and final results
  4. GRB 051022: RTT150 optical observations
  5. GRB 051021A: RTT150 optical observations
  6. GRB051028 SARA Observation
  7. GRB051028: optical observations
  8. GRB051028: Swift/UVOT upper limits
  9. GRB051028: WHT optical candidate
  10. GRB051028: Swift XRT Position
  11. GRB051028:MASTER observations
  12. GRB 051022: XRT Refined Spectral and Temporal Analysis--Correction
  13. GRB051022: Swift XRT measurement of jet break
  14. GRB051021B: Swift/UVOT Upper limits
  15. GRB 051022: XRT Refined Spectral and Temporal Analysis
  16. GRB 051022, refined optical astrometry
  17. Chandra Observations of GRB 051022
  18. GRB051012: Swift-XRT analysis
  19. GRB051021B: Swift XRT refined analysis
  20. GRB051021a: optical observations
  21. GRB 051022: WSRT Radio Detection
  22. GRB 051022, mm counterpart
  23. GRB051022: host galaxy redshift
  24. GRB 051022: Swift/UVOT Upper Limits
  25. GRB051022: Radio Counterpart
  26. GRB051022: IR observations
  27. GRB 051022: SOAR JKs Observations
  28. GRB051021A: Swift XRT refined analysis
  29. Konus-Wind observation of GRB 051022
  30. GRB051022: Optical Observations
  31. GRB 051022: Magellan NIR imaging
  32. GRB 051021: PROMPT RcIc Observations
  33. GRB051021b: Magellan IR Imaging
  34. GRB 051021: Correction
  35. GRB 051022, J & K-band observation
  36. GRB 051021, SMARTS optical/IR observations
  37. GRB051022: Swift XRT Position
  38. GRB 051021: P200 Ks Observations
  39. IPN triangulation of GRB051022 (=H3950)
  40. GRB 051021: MDM Upper Limit
  41. GRB 051022 (=H3950): SXC Flight Localization is Valid
  42. GRB051021: Swift/UVOT Upper Limits
  43. GRB 051021B: Refined analysis of the Swift-BAT burst
  44. GRB 051022: SSO40 Optical Observations
  45. GRB 051022A: ROTSE-III Optical Limits
  46. GRB051022 (=H3590), A GRB Detected By HETE
  47. GRB 051022: Optical observations
  48. GRB051021B: Swift XRT Position
  49. GRB 051021: SOAR NIR Observations
  50. GRB051021: Swift XRT analysis
  51. GRB 051021 : optical afterglow observation at Lulin
  52. GRB 051021: Optical observations
  53. GRB 051021: ROTSE-III Confirmation of Optical Counterpart
  54. GRB 051021: Optical observations and candidate afterglow
  55. GRB051021: A GRB Localized by HETE
  56. GRB 050502b: Optical limit
  57. GRB 051016b: Optical limit
  58. Afterglow candidate of GRB 051016B observed at Lulin
  59. GRB 051016b: Gemini Near IR Observations
  60. GRB 051016A: Swift/UVOT upper limits
  61. GRB 051016B: refined analysis of the Swift/XRT data
  62. GRB 051016B: Swift/UVOT detection
  63. GRB 051016B : Optical follow-up at Lulin
  64. GRB 051016B: Refined analysis of the Swift-BAT burst
  65. GRB 051016: Swift-BAT refined analysis
  66. GRB051016: Planned XMM-Newton observation
  67. GRB 051016: LCO optical and near-IR imaging
  68. GRB 051016: PROMPT Observations
  69. Photometric calibration of Swift/UVOT and Re-analysis of Swift/UVOT GRB 050922C data
  70. GRB051006: optical observations
  71. Swift trigger 159578 is not a burst
  72. GRB050805A: Rc optical observations
  73. GRB 051006: Swift/UVOT Upper Limits
  74. GRB051008: optical candidate
  75. GRB 051008 - a low redshift low-luminosity burst?
  76. GRB051008: Swift XRT refined analysis
  77. GRB051008 - Swift UVOT upper limits
  78. Konus-Wind observation of GRB 051008
  79. GRB051008: Final refined analysis of the Swift-BAT burst
  80. GRB 051008: R-band upper limit
  81. GRB051008: Refined analysis of the Swift-BAT burst
  82. GRB051008: Radio Observation
  83. GRB 051008: Swift XRT position
  84. GRB 051008, optical observations
  85. GRB 051006: P60 Observations
  86. GRB 051006: XRT refined analysis
  87. GRB051006: Refined analysis of the Swift-BAT burst
  88. GRB 051006: XRT position
  89. GRB 050906, summary of radio observations
  90. Swift-BAT triggers 158261 and 158262 Retraction
  91. GRB051001: Swift UVOT Upper Limits
  92. GRB 050925: Second Epoch WSRT Radio Observations
  93. GRB 051001: Swift XRT refined analysis
  94. GRB 051001, optical observations at Mt. John
  95. GRB 051001: I-band limit
  96. GRB 051001: AAT infra-red observations
  97. GRB 051001: Swift-BAT refined analysis
  98. GRB 051001: ROTSE-III Optical Limits
  99. GRB050908: optical observations
  100. GRB050922B: optical limit

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