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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"

36012 results found.

  1. GRB 051109A: ROTSE-III Decline rate for Optical Counterpart
  2. GRB 051109a: IR Detections
  3. GRB 051109: ROTSE-III Detection of Possible Counterpart
  4. GRB051105B: Swift/XRT upper limit
  5. GRB051105B: Swift/UVOT upper limit
  6. GRB051103: optical observations
  7. GRB 051103, optical observations
  8. GRB051103: MASTER: OT limit and host galaxy candidates
  9. GRB 051105a, observation from Naini Tal and OSN
  10. GRB 051105A, 2nd epoch optical observations
  11. GRB 051105a: MDM Observations
  12. GRB 051105A: TNG optical observations
  13. GRB051105A: Swift/UVOT Observations
  14. GRB 051105A, radio observations
  15. GRB051103:_MASTER_optical_observations
  16. IPN triangulation and Konus spectrum of the bright short/hard GRB051103
  17. GRB 051105A, optical observations
  18. XRT observations of GRB 051105A
  19. GRB 051105: Swift-BAT improved refined analysis
  20. GRB 051105b: ART optical limits
  21. GRB051105B - A long GRB detected by INTEGRAL
  22. GRB 051105B (INTEGRAL 2701): Optical observation
  23. GRB 051105: Swift-BAT refined analysis
  24. GRB 051105: Optical limit
  25. GRB 051105: Swift detection of a short burst
  26. IBAS Alert 2700: Not a GRB
  27. GRB 051016B host spectroscopy and redshift
  28. GRB051016B: optical observation
  29. Recent GRB UBVRcIc field photometry
  30. Konus-Wind observation of GRB 051028
  31. GRB051028:MASTER correction and final results
  32. GRB 051022: RTT150 optical observations
  33. GRB 051021A: RTT150 optical observations
  34. GRB051028 SARA Observation
  35. GRB051028: optical observations
  36. GRB051028: Swift/UVOT upper limits
  37. GRB051028: confirmation of the afterglow
  38. GRB051028: WHT optical candidate
  39. GRB051028: Swift XRT Position
  40. GRB051028:MASTER observations
  41. GRB 051028 (=H3951): A GRB localized by HETE
  42. GRB051028:MASTER optical observations
  43. GRB 051022: XRT Refined Spectral and Temporal Analysis--Correction
  44. GRB051022: Swift XRT measurement of jet break
  45. GRB051021B: Swift/UVOT Upper limits
  46. GRB 051021, Optical Observations
  47. GRB 051022: XRT Refined Spectral and Temporal Analysis
  48. GRB 051022, refined optical astrometry
  49. Chandra Observations of GRB 051022
  50. GRB 051022 Chandra Observations scheduled
  51. GRB051021a: optical observations
  52. GRB 051022: WSRT Radio Detection
  53. GRB 051022, mm counterpart
  54. GRB051022: host galaxy redshift
  55. GRB 051022: Swift/UVOT Upper Limits
  56. GRB051022: Radio Counterpart
  57. GRB 051022: SOAR JKs Observations
  58. Konus-Wind observation of GRB 051022
  59. GRB051022: Optical Observations
  60. GRB 051022: Magellan NIR imaging
  61. GRB 051021: PROMPT RcIc Observations
  62. GRB051021b: Magellan IR Imaging
  63. GRB 051022: Spectral Analysis Indicates That The Spectrum Is Absorbed
  64. GRB 051021: Correction
  65. GRB 051022, J & K-band observation
  66. GRB 051021, SMARTS optical/IR observations
  67. GRB 051021: P200 Ks Observations
  68. IPN triangulation of GRB051022 (=H3950)
  69. GRB 051021: MDM Upper Limit
  70. GRB 051022 (=H3950): SXC Flight Localization is Valid
  71. GRB051021: Swift/UVOT Upper Limits
  72. GRB 051021B: Refined analysis of the Swift-BAT burst
  73. GRB 051022: SSO40 Optical Observations
  74. GRB 051022A: ROTSE-III Optical Limits
  75. GRB051022 (=H3590), A GRB Detected By HETE
  76. GRB 051022: Optical observations
  77. GRB 051021,optical observation
  78. GRB051021B: Swift XRT Position
  79. GRB 051021: SOAR NIR Observations
  80. GRB 051021B: Swift detection of a burst
  81. GRB051021 (=H3947): Refined Analysis
  82. GRB 051021 : optical afterglow observation at Lulin
  83. GRB 051021: Optical observations
  84. GRB 051021: ROTSE-III Confirmation of Optical Counterpart
  85. GRB 051021: Optical observations and candidate afterglow
  86. GRB051021.63
  87. GRB051021.6: MASTER optical observation
  88. Swift-BAT trigger 160640 is not a real GRB
  89. GRB051021: A GRB Localized by HETE
  90. Swift-BAT trigger 160619 is not a GRB
  91. Swift-BAT triggered on a posible CR Shower or possible GRB
  92. GRB 050502b: Optical limit
  93. GRB 051016b: Optical limit
  94. Afterglow candidate of GRB 051016B observed at Lulin
  95. GRB 051016b: Gemini Near IR Observations
  96. GRB 051016A: Swift/UVOT upper limits
  97. GRB 051016B: refined analysis of the Swift/XRT data
  98. GRB 051016B: Swift/UVOT detection
  99. GRB 051016B,optical observation
  100. GRB 051016B : Optical follow-up at Lulin

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