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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"

37699 results found.

  1. GRB 051105A, radio observations
  2. GRB051103:_MASTER_optical_observations
  3. IPN triangulation and Konus spectrum of the bright short/hard GRB051103
  4. GRB 051105A, optical observations
  5. XRT observations of GRB 051105A
  6. GRB 051105: Swift-BAT improved refined analysis
  7. GRB 051105b: ART optical limits
  8. GRB051105B - A long GRB detected by INTEGRAL
  9. GRB 051105B (INTEGRAL 2701): Optical observation
  10. GRB 051105: Swift-BAT refined analysis
  11. GRB 051105: Optical limit
  12. GRB 051105: Swift detection of a short burst
  13. IBAS Alert 2700: Not a GRB
  14. GRB 051016B host spectroscopy and redshift
  15. GRB051016B: optical observation
  16. Recent GRB UBVRcIc field photometry
  17. Konus-Wind observation of GRB 051028
  18. GRB051028:MASTER correction and final results
  19. GRB 051022: RTT150 optical observations
  20. GRB 051021A: RTT150 optical observations
  21. GRB051028 SARA Observation
  22. GRB051028: optical observations
  23. GRB051028: Swift/UVOT upper limits
  24. GRB051028: confirmation of the afterglow
  25. GRB051028: WHT optical candidate
  26. GRB051028: Swift XRT Position
  27. GRB051028:MASTER observations
  28. GRB 051028 (=H3951): A GRB localized by HETE
  29. GRB051028:MASTER optical observations
  30. GRB 051022: XRT Refined Spectral and Temporal Analysis--Correction
  31. GRB051022: Swift XRT measurement of jet break
  32. GRB051021B: Swift/UVOT Upper limits
  33. GRB 051021, Optical Observations
  34. GRB 051022: XRT Refined Spectral and Temporal Analysis
  35. GRB 051022, refined optical astrometry
  36. Chandra Observations of GRB 051022
  37. GRB 051022 Chandra Observations scheduled
  38. GRB051021a: optical observations
  39. GRB 051022: WSRT Radio Detection
  40. GRB 051022, mm counterpart
  41. GRB051022: host galaxy redshift
  42. GRB 051022: Swift/UVOT Upper Limits
  43. GRB051022: Radio Counterpart
  44. GRB 051022: SOAR JKs Observations
  45. Konus-Wind observation of GRB 051022
  46. GRB051022: Optical Observations
  47. GRB 051022: Magellan NIR imaging
  48. GRB 051021: PROMPT RcIc Observations
  49. GRB051021b: Magellan IR Imaging
  50. GRB 051022: Spectral Analysis Indicates That The Spectrum Is Absorbed
  51. GRB 051021: Correction
  52. GRB 051022, J & K-band observation
  53. GRB 051021, SMARTS optical/IR observations
  54. GRB 051021: P200 Ks Observations
  55. IPN triangulation of GRB051022 (=H3950)
  56. GRB 051021: MDM Upper Limit
  57. GRB 051022 (=H3950): SXC Flight Localization is Valid
  58. GRB051021: Swift/UVOT Upper Limits
  59. GRB 051021B: Refined analysis of the Swift-BAT burst
  60. GRB 051022: SSO40 Optical Observations
  61. GRB 051022A: ROTSE-III Optical Limits
  62. GRB051022 (=H3590), A GRB Detected By HETE
  63. GRB 051022: Optical observations
  64. GRB 051021,optical observation
  65. GRB051021B: Swift XRT Position
  66. GRB 051021: SOAR NIR Observations
  67. GRB 051021B: Swift detection of a burst
  68. GRB051021 (=H3947): Refined Analysis
  69. GRB 051021 : optical afterglow observation at Lulin
  70. GRB 051021: Optical observations
  71. GRB 051021: ROTSE-III Confirmation of Optical Counterpart
  72. GRB 051021: Optical observations and candidate afterglow
  73. GRB051021.63
  74. GRB051021.6: MASTER optical observation
  75. Swift-BAT trigger 160640 is not a real GRB
  76. GRB051021: A GRB Localized by HETE
  77. Swift-BAT trigger 160619 is not a GRB
  78. Swift-BAT triggered on a posible CR Shower or possible GRB
  79. GRB 050502b: Optical limit
  80. GRB 051016b: Optical limit
  81. Afterglow candidate of GRB 051016B observed at Lulin
  82. GRB 051016b: Gemini Near IR Observations
  83. GRB 051016A: Swift/UVOT upper limits
  84. GRB 051016B: refined analysis of the Swift/XRT data
  85. GRB 051016B: Swift/UVOT detection
  86. GRB 051016B,optical observation
  87. GRB 051016B : Optical follow-up at Lulin
  88. GRB 051016B: Refined analysis of the Swift-BAT burst
  89. GRB 051016B: Swift detection of a soft burst
  90. GRB 051016: Swift-BAT refined analysis
  91. GRB051016: Swift XRT refined analysis.
  92. GRB 051016: LCO optical and near-IR imaging
  93. GRB 051016: PROMPT Observations
  94. GRB051016: Swift detection of a burst
  95. Photometric calibration of Swift/UVOT and Re-analysis of Swift/UVOT GRB 050922C data
  96. GRB051006: optical observations
  97. GRB 051012: Swift-BAT detection of burst yesterday
  98. Swift trigger 159578 is not a burst
  99. GRB 051006: Swift/UVOT Upper Limits
  100. IBAS Alert 2675 : not a GRB

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