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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"

36309 results found.

  1. GRB 051105A, 2nd epoch optical observations
  2. GRB 051105a: MDM Observations
  3. GRB 051105A: TNG optical observations
  4. GRB051105A: Swift/UVOT Observations
  5. GRB 051105A, radio observations
  6. GRB051103:_MASTER_optical_observations
  7. IPN triangulation and Konus spectrum of the bright short/hard GRB051103
  8. GRB 051105A, optical observations
  9. XRT observations of GRB 051105A
  10. GRB 051105: Swift-BAT improved refined analysis
  11. GRB 051105b: ART optical limits
  12. GRB051105B - A long GRB detected by INTEGRAL
  13. GRB 051105B (INTEGRAL 2701): Optical observation
  14. GRB 051105: Swift-BAT refined analysis
  15. GRB 051105: Optical limit
  16. GRB 051105: Swift detection of a short burst
  17. IBAS Alert 2700: Not a GRB
  18. GRB 051016B host spectroscopy and redshift
  19. GRB051016B: optical observation
  20. Recent GRB UBVRcIc field photometry
  21. Konus-Wind observation of GRB 051028
  22. GRB051028:MASTER correction and final results
  23. GRB 051022: RTT150 optical observations
  24. GRB 051021A: RTT150 optical observations
  25. GRB051028 SARA Observation
  26. GRB051028: optical observations
  27. GRB051028: Swift/UVOT upper limits
  28. GRB051028: confirmation of the afterglow
  29. GRB051028: WHT optical candidate
  30. GRB051028: Swift XRT Position
  31. GRB051028:MASTER observations
  32. GRB 051028 (=H3951): A GRB localized by HETE
  33. GRB051028:MASTER optical observations
  34. GRB 051022: XRT Refined Spectral and Temporal Analysis--Correction
  35. GRB051022: Swift XRT measurement of jet break
  36. GRB051021B: Swift/UVOT Upper limits
  37. GRB 051021, Optical Observations
  38. GRB 051022: XRT Refined Spectral and Temporal Analysis
  39. GRB 051022, refined optical astrometry
  40. Chandra Observations of GRB 051022
  41. GRB 051022 Chandra Observations scheduled
  42. GRB051021a: optical observations
  43. GRB 051022: WSRT Radio Detection
  44. GRB 051022, mm counterpart
  45. GRB051022: host galaxy redshift
  46. GRB 051022: Swift/UVOT Upper Limits
  47. GRB051022: Radio Counterpart
  48. GRB 051022: SOAR JKs Observations
  49. Konus-Wind observation of GRB 051022
  50. GRB051022: Optical Observations
  51. GRB 051022: Magellan NIR imaging
  52. GRB 051021: PROMPT RcIc Observations
  53. GRB051021b: Magellan IR Imaging
  54. GRB 051022: Spectral Analysis Indicates That The Spectrum Is Absorbed
  55. GRB 051021: Correction
  56. GRB 051022, J & K-band observation
  57. GRB 051021, SMARTS optical/IR observations
  58. GRB 051021: P200 Ks Observations
  59. IPN triangulation of GRB051022 (=H3950)
  60. GRB 051021: MDM Upper Limit
  61. GRB 051022 (=H3950): SXC Flight Localization is Valid
  62. GRB051021: Swift/UVOT Upper Limits
  63. GRB 051021B: Refined analysis of the Swift-BAT burst
  64. GRB 051022: SSO40 Optical Observations
  65. GRB 051022A: ROTSE-III Optical Limits
  66. GRB051022 (=H3590), A GRB Detected By HETE
  67. GRB 051022: Optical observations
  68. GRB 051021,optical observation
  69. GRB051021B: Swift XRT Position
  70. GRB 051021: SOAR NIR Observations
  71. GRB 051021B: Swift detection of a burst
  72. GRB051021 (=H3947): Refined Analysis
  73. GRB 051021 : optical afterglow observation at Lulin
  74. GRB 051021: Optical observations
  75. GRB 051021: ROTSE-III Confirmation of Optical Counterpart
  76. GRB 051021: Optical observations and candidate afterglow
  77. GRB051021.63
  78. GRB051021.6: MASTER optical observation
  79. Swift-BAT trigger 160640 is not a real GRB
  80. GRB051021: A GRB Localized by HETE
  81. Swift-BAT trigger 160619 is not a GRB
  82. Swift-BAT triggered on a posible CR Shower or possible GRB
  83. GRB 050502b: Optical limit
  84. GRB 051016b: Optical limit
  85. Afterglow candidate of GRB 051016B observed at Lulin
  86. GRB 051016b: Gemini Near IR Observations
  87. GRB 051016A: Swift/UVOT upper limits
  88. GRB 051016B: refined analysis of the Swift/XRT data
  89. GRB 051016B: Swift/UVOT detection
  90. GRB 051016B,optical observation
  91. GRB 051016B : Optical follow-up at Lulin
  92. GRB 051016B: Refined analysis of the Swift-BAT burst
  93. GRB 051016B: Swift detection of a soft burst
  94. GRB 051016: Swift-BAT refined analysis
  95. GRB051016: Swift XRT refined analysis.
  96. GRB 051016: LCO optical and near-IR imaging
  97. GRB 051016: PROMPT Observations
  98. GRB051016: Swift detection of a burst
  99. Photometric calibration of Swift/UVOT and Re-analysis of Swift/UVOT GRB 050922C data
  100. GRB051006: optical observations

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