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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"

23699 results found.

  1. GRB051117B: Swift XRT refined analysis
  2. GRB051117b: No Swift/UVOT Detection
  3. GRB051111: Suzaku WAM observation of the prompt emission
  4. GRB 051021 Optical Observations
  5. GRB 051117A: Refined analysis of the Swift-BAT burst
  6. GRB051117A : XRT refined analysis
  7. GRB 051117B: Lulin R and I band observation
  8. GRB051117B: Swift XRT position
  9. GRB 051117B: Swift detection of a burst
  10. GRB 051117: Swift detection of a bright burst
  11. GRB 051028 Optical Observations
  12. GRB050925: analysis of the XMM-Newton observation
  13. GRB051109A optical observations
  14. GRB 051113: Swift-BAT refined analysis
  15. GRB051111: Swift/UVOT Observations
  16. GRB 051111: Swift-BAT refined analysis
  17. GRB 051109A Optical Observations
  18. GRB 051111A : Lulin BVRI multi band afterglow observation
  19. GRB 051111: Keck HIRES redshift
  20. GRB 051111A: KAIT optical observations
  21. GRB 051111a: Afterglow fading in Ic
  22. Faulkes Telescope R-band detection of GRB051111
  23. GRB 051103 Milagro GeV/TeV Observations
  24. GRB 051109B. Radio Observations
  25. GRB 051109A
  26. GRB 051109A: KAIT optical observations
  27. Konus-Wind observation of GRB 051109A
  28. IPN triangulation and Konus spectrum of the short/soft GRB051107 (large
  29. GRB051109B: no UVOT source detected
  30. GRB 051109B : Lulin Optical Observations
  31. GRB 051109A : Lulin BVRI Optical afterglow observation
  32. GRB 051109a: BOOTES R & I-band detection of the early afterglow
  33. GRB 051109B: Super-LOTIS Observations
  34. GRB051105B: REM Optical observation
  35. GRB 051109B: Swift detection of a burst
  36. GRB 051109: PROMPT Detections
  37. GRB 051109: Rc and Ic observations
  38. GRB051109: Early Super-LOTIS Detection
  39. GRB 051109: Swift-BAT refined analysis
  40. GRB051109: Swift detection of a burst
  41. GRB051103: optical observations
  42. GRB 051103, optical observations
  43. GRB051103: MASTER: OT limit and host galaxy candidates
  44. GRB051028: Swift-XRT refined analysis
  45. GRB 051105A, 2nd epoch optical observations
  46. GRB 051105a: MDM Observations
  47. GRB 051105A: TNG optical observations
  48. GRB051105A: Swift/UVOT Observations
  49. GRB051103:_MASTER_optical_observations
  50. IPN triangulation and Konus spectrum of the bright short/hard GRB051103
  51. GRB 051105: Swift-BAT improved refined analysis
  52. GRB051105B - A long GRB detected by INTEGRAL
  53. GRB 051105: Swift-BAT refined analysis
  54. GRB 051105: Swift detection of a short burst
  55. GRB 051016B host spectroscopy and redshift
  56. GRB051016B: optical observation
  57. Recent GRB UBVRcIc field photometry
  58. Konus-Wind observation of GRB 051028
  59. GRB051028:MASTER correction and final results
  60. GRB 051022: RTT150 optical observations
  61. GRB 051021A: RTT150 optical observations
  62. GRB051028 SARA Observation
  63. GRB051028: optical observations
  64. GRB051028: Swift/UVOT upper limits
  65. GRB051028: confirmation of the afterglow
  66. GRB051028: WHT optical candidate
  67. GRB051028: Swift XRT Position
  68. GRB051028:MASTER observations
  69. GRB 051028 (=H3951): A GRB localized by HETE
  70. GRB051028:MASTER optical observations
  71. SGR 1806-20: continued moderate activity seen with INTEGRAL
  72. GRB051021B: Swift/UVOT Upper limits
  73. GRB 051022, refined optical astrometry
  74. GRB051012: Swift-XRT analysis
  75. GRB051021a: optical observations
  76. GRB 051022, mm counterpart
  77. GRB051022: host galaxy redshift
  78. GRB 051022: SOAR JKs Observations
  79. GRB 051021: PROMPT RcIc Observations
  80. GRB 051022: Spectral Analysis Indicates That The Spectrum Is Absorbed
  81. GRB 051022, J & K-band observation
  82. IPN triangulation of GRB051022 (=H3950)
  83. GRB 051022 (=H3950): SXC Flight Localization is Valid
  84. GRB051021: Swift/UVOT Upper Limits
  85. GRB 051021B: Refined analysis of the Swift-BAT burst
  86. GRB051022 (=H3590), A GRB Detected By HETE
  87. GRB 051021: SOAR NIR Observations
  88. GRB 051021B: Swift detection of a burst
  89. GRB051021 (=H3947): Refined Analysis
  90. GRB 051021 : optical afterglow observation at Lulin
  91. GRB 051021: Optical observations
  92. GRB051021.63
  93. GRB051021.6: MASTER optical observation
  94. GRB051021: A GRB Localized by HETE
  95. GRB 051016A: Swift/UVOT upper limits
  96. GRB 051016B: Swift/UVOT detection
  97. GRB 051016B : Optical follow-up at Lulin
  98. GRB 051016: Swift-BAT refined analysis
  99. GRB 051016: LCO optical and near-IR imaging
  100. GRB 051016: PROMPT Observations

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