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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"

42885 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. IPN triangulation and Konus spectrum of the bright short/hard GRB051103
  7. GRB 051105A, optical observations
  8. XRT observations of GRB 051105A
  9. GRB 051105: Swift-BAT improved refined analysis
  10. GRB 051105b: ART optical limits
  11. GRB051105B - A long GRB detected by INTEGRAL
  12. GRB 051105B (INTEGRAL 2701): Optical observation
  13. GRB 051105: Swift-BAT refined analysis
  14. GRB 051105: Swift detection of a short burst
  15. IBAS Alert 2700: Not a GRB
  16. GRB 051016B host spectroscopy and redshift
  17. GRB051016B: optical observation
  18. Recent GRB UBVRcIc field photometry
  19. Konus-Wind observation of GRB 051028
  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. GRB 051028 (=H3951): A GRB localized by HETE
  27. GRB051022: Swift XRT measurement of jet break
  28. SGR 1806-20: continued moderate activity seen with INTEGRAL
  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. GRB051012: Swift-XRT analysis
  35. GRB 051022 Chandra Observations scheduled
  36. GRB051021B: Swift XRT refined analysis
  37. GRB051021a: optical observations
  38. GRB 051022: WSRT Radio Detection
  39. GRB 051022, mm counterpart
  40. GRB051022: host galaxy redshift
  41. GRB 051022: Swift/UVOT Upper Limits
  42. GRB051022: Radio Counterpart
  43. GRB051022: IR observations
  44. GRB 051022: SOAR JKs Observations
  45. GRB051021A: Swift XRT refined analysis
  46. Konus-Wind observation of GRB 051022
  47. GRB051022: Optical Observations
  48. GRB 051022: Magellan NIR imaging
  49. GRB 051021: PROMPT RcIc Observations
  50. GRB051021b: Magellan IR Imaging
  51. GRB 051022: Spectral Analysis Indicates That The Spectrum Is Absorbed
  52. GRB 051021: Correction
  53. GRB 051022, J & K-band observation
  54. GRB 051021, SMARTS optical/IR observations
  55. GRB051022: Swift XRT Position
  56. GRB 051021: P200 Ks Observations
  57. IPN triangulation of GRB051022 (=H3950)
  58. GRB 051021: MDM Upper Limit
  59. GRB 051022 (=H3950): SXC Flight Localization is Valid
  60. GRB 051021B: Refined analysis of the Swift-BAT burst
  61. GRB 051022: SSO40 Optical Observations
  62. GRB051022 (=H3590), A GRB Detected By HETE
  63. GRB 051022: Optical observations
  64. GRB051021B: Swift XRT Position
  65. GRB 051021: SOAR NIR Observations
  66. GRB 051021B: Swift detection of a burst
  67. GRB051021 (=H3947): Refined Analysis
  68. GRB 051021: Optical observations
  69. GRB 051021: ROTSE-III Confirmation of Optical Counterpart
  70. GRB 051021: Optical observations and candidate afterglow
  71. Swift-BAT trigger 160640 is not a real GRB
  72. GRB051021: A GRB Localized by HETE
  73. Swift-BAT trigger 160619 is not a GRB
  74. Swift-BAT triggered on a posible CR Shower or possible GRB
  75. GRB 050502b: Optical limit
  76. GRB 051016b: Gemini Near IR Observations
  77. GRB 051016A: Swift/UVOT upper limits
  78. GRB 051016B: refined analysis of the Swift/XRT data
  79. GRB 051016B: Swift/UVOT detection
  80. GRB 051016B,optical observation
  81. GRB 051016B : Optical follow-up at Lulin
  82. GRB 051016B: Refined analysis of the Swift-BAT burst
  83. GRB 051016B: Swift detection of a soft burst
  84. GRB 051016: Swift-BAT refined analysis
  85. GRB051016 XMM-Newton observation
  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. GRB 051012: Swift-BAT detection of burst yesterday
  92. Swift trigger 159578 is not a burst
  93. Swift-BAT Trigger 159578 is a possible burst
  94. GRB050805A: Rc optical observations
  95. GRB 051006: Swift/UVOT Upper Limits
  96. IBAS Alert 2675 : not a GRB
  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. GRB051008: Swift XRT refined analysis

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