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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"

35994 results found.

  1. GRB 051105: Swift-BAT improved refined analysis
  2. GRB 051105b: ART optical limits
  3. GRB051105B - A long GRB detected by INTEGRAL
  4. GRB 051105B (INTEGRAL 2701): Optical observation
  5. GRB 051105: Swift-BAT refined analysis
  6. GRB 051105: Optical limit
  7. GRB 051105: Swift detection of a short burst
  8. IBAS Alert 2700: Not a GRB
  9. GRB 051016B host spectroscopy and redshift
  10. GRB051016B: optical observation
  11. Recent GRB UBVRcIc field photometry
  12. Konus-Wind observation of GRB 051028
  13. GRB051028:MASTER correction and final results
  14. GRB 051022: RTT150 optical observations
  15. GRB 051021A: RTT150 optical observations
  16. GRB051028 SARA Observation
  17. GRB051028: optical observations
  18. GRB051028: Swift/UVOT upper limits
  19. GRB051028: confirmation of the afterglow
  20. GRB051028: WHT optical candidate
  21. GRB051028: Swift XRT Position
  22. GRB051028:MASTER observations
  23. GRB 051028 (=H3951): A GRB localized by HETE
  24. GRB051028:MASTER optical observations
  25. GRB 051022: XRT Refined Spectral and Temporal Analysis--Correction
  26. GRB051022: Swift XRT measurement of jet break
  27. GRB051021B: Swift/UVOT Upper limits
  28. GRB 051021, Optical Observations
  29. GRB 051022: XRT Refined Spectral and Temporal Analysis
  30. GRB 051022, refined optical astrometry
  31. Chandra Observations of GRB 051022
  32. GRB 051022 Chandra Observations scheduled
  33. GRB051021a: optical observations
  34. GRB 051022: WSRT Radio Detection
  35. GRB 051022, mm counterpart
  36. GRB051022: host galaxy redshift
  37. GRB 051022: Swift/UVOT Upper Limits
  38. GRB051022: Radio Counterpart
  39. GRB 051022: SOAR JKs Observations
  40. Konus-Wind observation of GRB 051022
  41. GRB051022: Optical Observations
  42. GRB 051022: Magellan NIR imaging
  43. GRB 051021: PROMPT RcIc Observations
  44. GRB051021b: Magellan IR Imaging
  45. GRB 051022: Spectral Analysis Indicates That The Spectrum Is Absorbed
  46. GRB 051021: Correction
  47. GRB 051022, J & K-band observation
  48. GRB 051021, SMARTS optical/IR observations
  49. GRB 051021: P200 Ks Observations
  50. IPN triangulation of GRB051022 (=H3950)
  51. GRB 051021: MDM Upper Limit
  52. GRB 051022 (=H3950): SXC Flight Localization is Valid
  53. GRB051021: Swift/UVOT Upper Limits
  54. GRB 051021B: Refined analysis of the Swift-BAT burst
  55. GRB 051022: SSO40 Optical Observations
  56. GRB 051022A: ROTSE-III Optical Limits
  57. GRB051022 (=H3590), A GRB Detected By HETE
  58. GRB 051022: Optical observations
  59. GRB 051021,optical observation
  60. GRB051021B: Swift XRT Position
  61. GRB 051021: SOAR NIR Observations
  62. GRB 051021B: Swift detection of a burst
  63. GRB051021 (=H3947): Refined Analysis
  64. GRB 051021 : optical afterglow observation at Lulin
  65. GRB 051021: Optical observations
  66. GRB 051021: ROTSE-III Confirmation of Optical Counterpart
  67. GRB 051021: Optical observations and candidate afterglow
  68. GRB051021.63
  69. GRB051021.6: MASTER optical observation
  70. Swift-BAT trigger 160640 is not a real GRB
  71. GRB051021: A GRB Localized by HETE
  72. Swift-BAT trigger 160619 is not a GRB
  73. Swift-BAT triggered on a posible CR Shower or possible GRB
  74. GRB 050502b: Optical limit
  75. GRB 051016b: Optical limit
  76. Afterglow candidate of GRB 051016B observed at Lulin
  77. GRB 051016b: Gemini Near IR Observations
  78. GRB 051016A: Swift/UVOT upper limits
  79. GRB 051016B: refined analysis of the Swift/XRT data
  80. GRB 051016B: Swift/UVOT detection
  81. GRB 051016B,optical observation
  82. GRB 051016B : Optical follow-up at Lulin
  83. GRB 051016B: Refined analysis of the Swift-BAT burst
  84. GRB 051016B: Swift detection of a soft burst
  85. GRB 051016: Swift-BAT refined analysis
  86. GRB051016: Swift XRT refined analysis.
  87. GRB 051016: LCO optical and near-IR imaging
  88. GRB 051016: PROMPT Observations
  89. GRB051016: Swift detection of a burst
  90. Photometric calibration of Swift/UVOT and Re-analysis of Swift/UVOT GRB 050922C data
  91. GRB051006: optical observations
  92. GRB 051012: Swift-BAT detection of burst yesterday
  93. Swift trigger 159578 is not a burst
  94. GRB 051006: Swift/UVOT Upper Limits
  95. IBAS Alert 2675 : not a GRB
  96. GRB051008: optical candidate
  97. GRB 051008: - a high redshift high-luminosity burst?
  98. GRB 051008 - a low redshift low-luminosity burst?
  99. IBAS Alert 2673: not a real GRB
  100. GRB051011: MASTER optical observation

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