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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"

36096 results found.

  1. GRB 051105A, optical observations
  2. XRT observations of GRB 051105A
  3. GRB 051105: Swift-BAT improved refined analysis
  4. GRB 051105b: ART optical limits
  5. GRB051105B - A long GRB detected by INTEGRAL
  6. GRB 051105B (INTEGRAL 2701): Optical observation
  7. GRB 051105: Swift-BAT refined analysis
  8. GRB 051105: Optical limit
  9. GRB 051105: Swift detection of a short burst
  10. IBAS Alert 2700: Not a GRB
  11. GRB 051016B host spectroscopy and redshift
  12. GRB051016B: optical observation
  13. Recent GRB UBVRcIc field photometry
  14. Konus-Wind observation of GRB 051028
  15. GRB051028:MASTER correction and final results
  16. GRB 051022: RTT150 optical observations
  17. GRB 051021A: RTT150 optical observations
  18. GRB051028 SARA Observation
  19. GRB051028: optical observations
  20. GRB051028: Swift/UVOT upper limits
  21. GRB051028: confirmation of the afterglow
  22. GRB051028: WHT optical candidate
  23. GRB051028: Swift XRT Position
  24. GRB051028:MASTER observations
  25. GRB 051028 (=H3951): A GRB localized by HETE
  26. GRB051028:MASTER optical observations
  27. GRB 051022: XRT Refined Spectral and Temporal Analysis--Correction
  28. GRB051022: Swift XRT measurement of jet break
  29. GRB051021B: Swift/UVOT Upper limits
  30. GRB 051021, Optical Observations
  31. GRB 051022: XRT Refined Spectral and Temporal Analysis
  32. GRB 051022, refined optical astrometry
  33. Chandra Observations of GRB 051022
  34. GRB 051022 Chandra Observations scheduled
  35. GRB051021a: optical observations
  36. GRB 051022: WSRT Radio Detection
  37. GRB 051022, mm counterpart
  38. GRB051022: host galaxy redshift
  39. GRB 051022: Swift/UVOT Upper Limits
  40. GRB051022: Radio Counterpart
  41. GRB 051022: SOAR JKs Observations
  42. Konus-Wind observation of GRB 051022
  43. GRB051022: Optical Observations
  44. GRB 051022: Magellan NIR imaging
  45. GRB 051021: PROMPT RcIc Observations
  46. GRB051021b: Magellan IR Imaging
  47. GRB 051022: Spectral Analysis Indicates That The Spectrum Is Absorbed
  48. GRB 051021: Correction
  49. GRB 051022, J & K-band observation
  50. GRB 051021, SMARTS optical/IR observations
  51. GRB 051021: P200 Ks Observations
  52. IPN triangulation of GRB051022 (=H3950)
  53. GRB 051021: MDM Upper Limit
  54. GRB 051022 (=H3950): SXC Flight Localization is Valid
  55. GRB051021: Swift/UVOT Upper Limits
  56. GRB 051021B: Refined analysis of the Swift-BAT burst
  57. GRB 051022: SSO40 Optical Observations
  58. GRB 051022A: ROTSE-III Optical Limits
  59. GRB051022 (=H3590), A GRB Detected By HETE
  60. GRB 051022: Optical observations
  61. GRB 051021,optical observation
  62. GRB051021B: Swift XRT Position
  63. GRB 051021: SOAR NIR Observations
  64. GRB 051021B: Swift detection of a burst
  65. GRB051021 (=H3947): Refined Analysis
  66. GRB 051021 : optical afterglow observation at Lulin
  67. GRB 051021: Optical observations
  68. GRB 051021: ROTSE-III Confirmation of Optical Counterpart
  69. GRB 051021: Optical observations and candidate afterglow
  70. GRB051021.63
  71. GRB051021.6: MASTER optical observation
  72. Swift-BAT trigger 160640 is not a real GRB
  73. GRB051021: A GRB Localized by HETE
  74. Swift-BAT trigger 160619 is not a GRB
  75. Swift-BAT triggered on a posible CR Shower or possible GRB
  76. GRB 050502b: Optical limit
  77. GRB 051016b: Optical limit
  78. Afterglow candidate of GRB 051016B observed at Lulin
  79. GRB 051016b: Gemini Near IR Observations
  80. GRB 051016A: Swift/UVOT upper limits
  81. GRB 051016B: refined analysis of the Swift/XRT data
  82. GRB 051016B: Swift/UVOT detection
  83. GRB 051016B,optical observation
  84. GRB 051016B : Optical follow-up at Lulin
  85. GRB 051016B: Refined analysis of the Swift-BAT burst
  86. GRB 051016B: Swift detection of a soft burst
  87. GRB 051016: Swift-BAT refined analysis
  88. GRB051016: Swift XRT refined analysis.
  89. GRB 051016: LCO optical and near-IR imaging
  90. GRB 051016: PROMPT Observations
  91. GRB051016: Swift detection of a burst
  92. Photometric calibration of Swift/UVOT and Re-analysis of Swift/UVOT GRB 050922C data
  93. GRB051006: optical observations
  94. GRB 051012: Swift-BAT detection of burst yesterday
  95. Swift trigger 159578 is not a burst
  96. GRB 051006: Swift/UVOT Upper Limits
  97. IBAS Alert 2675 : not a GRB
  98. GRB051008: optical candidate
  99. GRB 051008: - a high redshift high-luminosity burst?
  100. GRB 051008 - a low redshift low-luminosity burst?

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