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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"

36109 results found.

  1. GRB051105B: Swift/XRT upper limit
  2. GRB051105B: Swift/UVOT upper limit
  3. GRB051103: optical observations
  4. GRB 051103, optical observations
  5. GRB051103: MASTER: OT limit and host galaxy candidates
  6. GRB 051105a, observation from Naini Tal and OSN
  7. GRB 051105A, 2nd epoch optical observations
  8. GRB 051105a: MDM Observations
  9. GRB 051105A: TNG optical observations
  10. GRB051105A: Swift/UVOT Observations
  11. GRB 051105A, radio observations
  12. GRB051103:_MASTER_optical_observations
  13. IPN triangulation and Konus spectrum of the bright short/hard GRB051103
  14. GRB 051105A, optical observations
  15. XRT observations of GRB 051105A
  16. GRB 051105: Swift-BAT improved refined analysis
  17. GRB 051105b: ART optical limits
  18. GRB051105B - A long GRB detected by INTEGRAL
  19. GRB 051105B (INTEGRAL 2701): Optical observation
  20. GRB 051105: Swift-BAT refined analysis
  21. GRB 051105: Optical limit
  22. GRB 051105: Swift detection of a short burst
  23. IBAS Alert 2700: Not a GRB
  24. GRB 051016B host spectroscopy and redshift
  25. GRB051016B: optical observation
  26. Recent GRB UBVRcIc field photometry
  27. Konus-Wind observation of GRB 051028
  28. GRB051028:MASTER correction and final results
  29. GRB 051022: RTT150 optical observations
  30. GRB 051021A: RTT150 optical observations
  31. GRB051028 SARA Observation
  32. GRB051028: optical observations
  33. GRB051028: Swift/UVOT upper limits
  34. GRB051028: confirmation of the afterglow
  35. GRB051028: WHT optical candidate
  36. GRB051028: Swift XRT Position
  37. GRB051028:MASTER observations
  38. GRB 051028 (=H3951): A GRB localized by HETE
  39. GRB051028:MASTER optical observations
  40. GRB 051022: XRT Refined Spectral and Temporal Analysis--Correction
  41. GRB051022: Swift XRT measurement of jet break
  42. GRB051021B: Swift/UVOT Upper limits
  43. GRB 051021, Optical Observations
  44. GRB 051022: XRT Refined Spectral and Temporal Analysis
  45. GRB 051022, refined optical astrometry
  46. Chandra Observations of GRB 051022
  47. GRB 051022 Chandra Observations scheduled
  48. GRB051021a: optical observations
  49. GRB 051022: WSRT Radio Detection
  50. GRB 051022, mm counterpart
  51. GRB051022: host galaxy redshift
  52. GRB 051022: Swift/UVOT Upper Limits
  53. GRB051022: Radio Counterpart
  54. GRB 051022: SOAR JKs Observations
  55. Konus-Wind observation of GRB 051022
  56. GRB051022: Optical Observations
  57. GRB 051022: Magellan NIR imaging
  58. GRB 051021: PROMPT RcIc Observations
  59. GRB051021b: Magellan IR Imaging
  60. GRB 051022: Spectral Analysis Indicates That The Spectrum Is Absorbed
  61. GRB 051021: Correction
  62. GRB 051022, J & K-band observation
  63. GRB 051021, SMARTS optical/IR observations
  64. GRB 051021: P200 Ks Observations
  65. IPN triangulation of GRB051022 (=H3950)
  66. GRB 051021: MDM Upper Limit
  67. GRB 051022 (=H3950): SXC Flight Localization is Valid
  68. GRB051021: Swift/UVOT Upper Limits
  69. GRB 051021B: Refined analysis of the Swift-BAT burst
  70. GRB 051022: SSO40 Optical Observations
  71. GRB 051022A: ROTSE-III Optical Limits
  72. GRB051022 (=H3590), A GRB Detected By HETE
  73. GRB 051022: Optical observations
  74. GRB 051021,optical observation
  75. GRB051021B: Swift XRT Position
  76. GRB 051021: SOAR NIR Observations
  77. GRB 051021B: Swift detection of a burst
  78. GRB051021 (=H3947): Refined Analysis
  79. GRB 051021 : optical afterglow observation at Lulin
  80. GRB 051021: Optical observations
  81. GRB 051021: ROTSE-III Confirmation of Optical Counterpart
  82. GRB 051021: Optical observations and candidate afterglow
  83. GRB051021.63
  84. GRB051021.6: MASTER optical observation
  85. Swift-BAT trigger 160640 is not a real GRB
  86. GRB051021: A GRB Localized by HETE
  87. Swift-BAT trigger 160619 is not a GRB
  88. Swift-BAT triggered on a posible CR Shower or possible GRB
  89. GRB 050502b: Optical limit
  90. GRB 051016b: Optical limit
  91. Afterglow candidate of GRB 051016B observed at Lulin
  92. GRB 051016b: Gemini Near IR Observations
  93. GRB 051016A: Swift/UVOT upper limits
  94. GRB 051016B: refined analysis of the Swift/XRT data
  95. GRB 051016B: Swift/UVOT detection
  96. GRB 051016B,optical observation
  97. GRB 051016B : Optical follow-up at Lulin
  98. GRB 051016B: Refined analysis of the Swift-BAT burst
  99. GRB 051016B: Swift detection of a soft burst
  100. GRB 051016: Swift-BAT refined analysis

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