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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"

37704 results found.

  1. GRB 051105a, observation from Naini Tal and OSN
  2. GRB 051105A, 2nd epoch optical observations
  3. GRB 051105a: MDM Observations
  4. GRB 051105A: TNG optical observations
  5. GRB051105A: Swift/UVOT Observations
  6. GRB 051105A, radio observations
  7. GRB051103:_MASTER_optical_observations
  8. IPN triangulation and Konus spectrum of the bright short/hard GRB051103
  9. GRB 051105A, optical observations
  10. XRT observations of GRB 051105A
  11. GRB 051105: Swift-BAT improved refined analysis
  12. GRB 051105b: ART optical limits
  13. GRB051105B - A long GRB detected by INTEGRAL
  14. GRB 051105B (INTEGRAL 2701): Optical observation
  15. GRB 051105: Swift-BAT refined analysis
  16. GRB 051105: Optical limit
  17. GRB 051105: Swift detection of a short burst
  18. IBAS Alert 2700: Not a GRB
  19. GRB 051016B host spectroscopy and redshift
  20. GRB051016B: optical observation
  21. Recent GRB UBVRcIc field photometry
  22. Konus-Wind observation of GRB 051028
  23. GRB051028:MASTER correction and final results
  24. GRB 051022: RTT150 optical observations
  25. GRB 051021A: RTT150 optical observations
  26. GRB051028 SARA Observation
  27. GRB051028: optical observations
  28. GRB051028: Swift/UVOT upper limits
  29. GRB051028: confirmation of the afterglow
  30. GRB051028: WHT optical candidate
  31. GRB051028: Swift XRT Position
  32. GRB051028:MASTER observations
  33. GRB 051028 (=H3951): A GRB localized by HETE
  34. GRB051028:MASTER optical observations
  35. GRB 051022: XRT Refined Spectral and Temporal Analysis--Correction
  36. GRB051022: Swift XRT measurement of jet break
  37. GRB051021B: Swift/UVOT Upper limits
  38. GRB 051021, Optical Observations
  39. GRB 051022: XRT Refined Spectral and Temporal Analysis
  40. GRB 051022, refined optical astrometry
  41. Chandra Observations of GRB 051022
  42. GRB 051022 Chandra Observations scheduled
  43. GRB051021a: optical observations
  44. GRB 051022: WSRT Radio Detection
  45. GRB 051022, mm counterpart
  46. GRB051022: host galaxy redshift
  47. GRB 051022: Swift/UVOT Upper Limits
  48. GRB051022: Radio Counterpart
  49. GRB 051022: SOAR JKs Observations
  50. Konus-Wind observation of GRB 051022
  51. GRB051022: Optical Observations
  52. GRB 051022: Magellan NIR imaging
  53. GRB 051021: PROMPT RcIc Observations
  54. GRB051021b: Magellan IR Imaging
  55. GRB 051022: Spectral Analysis Indicates That The Spectrum Is Absorbed
  56. GRB 051021: Correction
  57. GRB 051022, J & K-band observation
  58. GRB 051021, SMARTS optical/IR observations
  59. GRB 051021: P200 Ks Observations
  60. IPN triangulation of GRB051022 (=H3950)
  61. GRB 051021: MDM Upper Limit
  62. GRB 051022 (=H3950): SXC Flight Localization is Valid
  63. GRB051021: Swift/UVOT Upper Limits
  64. GRB 051021B: Refined analysis of the Swift-BAT burst
  65. GRB 051022: SSO40 Optical Observations
  66. GRB 051022A: ROTSE-III Optical Limits
  67. GRB051022 (=H3590), A GRB Detected By HETE
  68. GRB 051022: Optical observations
  69. GRB 051021,optical observation
  70. GRB051021B: Swift XRT Position
  71. GRB 051021: SOAR NIR Observations
  72. GRB 051021B: Swift detection of a burst
  73. GRB051021 (=H3947): Refined Analysis
  74. GRB 051021 : optical afterglow observation at Lulin
  75. GRB 051021: Optical observations
  76. GRB 051021: ROTSE-III Confirmation of Optical Counterpart
  77. GRB 051021: Optical observations and candidate afterglow
  78. GRB051021.63
  79. GRB051021.6: MASTER optical observation
  80. Swift-BAT trigger 160640 is not a real GRB
  81. GRB051021: A GRB Localized by HETE
  82. Swift-BAT trigger 160619 is not a GRB
  83. Swift-BAT triggered on a posible CR Shower or possible GRB
  84. GRB 050502b: Optical limit
  85. GRB 051016b: Optical limit
  86. Afterglow candidate of GRB 051016B observed at Lulin
  87. GRB 051016b: Gemini Near IR Observations
  88. GRB 051016A: Swift/UVOT upper limits
  89. GRB 051016B: refined analysis of the Swift/XRT data
  90. GRB 051016B: Swift/UVOT detection
  91. GRB 051016B,optical observation
  92. GRB 051016B : Optical follow-up at Lulin
  93. GRB 051016B: Refined analysis of the Swift-BAT burst
  94. GRB 051016B: Swift detection of a soft burst
  95. GRB 051016: Swift-BAT refined analysis
  96. GRB051016: Swift XRT refined analysis.
  97. GRB 051016: LCO optical and near-IR imaging
  98. GRB 051016: PROMPT Observations
  99. GRB051016: Swift detection of a burst
  100. Photometric calibration of Swift/UVOT and Re-analysis of Swift/UVOT GRB 050922C data

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