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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"

45554 results found.

  1. GRB 051109A: ROTSE-III Decline rate for Optical Counterpart
  2. GRB051109: Swift detection of a burst
  3. GRB 051109a: IR Detections
  4. GRB 051109: ROTSE-III Detection of Possible Counterpart
  5. GRB051105B: Swift/XRT upper limit
  6. GRB051105B: Swift/UVOT upper limit
  7. GRB051103: optical observations
  8. GRB 051103, optical observations
  9. GRB051103: MASTER: OT limit and host galaxy candidates
  10. GRB051028: Swift-XRT refined analysis
  11. GRB 051105a, observation from Naini Tal and OSN
  12. GRB 051105A, 2nd epoch optical observations
  13. GRB 051105a: MDM Observations
  14. GRB 051105A: TNG optical observations
  15. GRB051105A: Swift/UVOT Observations
  16. GRB 051105A, radio observations
  17. IPN triangulation and Konus spectrum of the bright short/hard GRB051103
  18. GRB 051105A, optical observations
  19. XRT observations of GRB 051105A
  20. GRB 051105: Swift-BAT improved refined analysis
  21. GRB 051105b: ART optical limits
  22. GRB051105B - A long GRB detected by INTEGRAL
  23. GRB 051105B (INTEGRAL 2701): Optical observation
  24. GRB 051105: Swift-BAT refined analysis
  25. GRB 051105: Optical limit
  26. GRB 051105: Swift detection of a short burst
  27. IBAS Alert 2700: Not a GRB
  28. GRB 051016B host spectroscopy and redshift
  29. GRB051016B: optical observation
  30. Recent GRB UBVRcIc field photometry
  31. Konus-Wind observation of GRB 051028
  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. GRB 051022: XRT Refined Spectral and Temporal Analysis--Correction
  43. GRB051022: Swift XRT measurement of jet break
  44. SGR 1806-20: continued moderate activity seen with INTEGRAL
  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. GRB051012: Swift-XRT analysis
  51. GRB 051022 Chandra Observations scheduled
  52. GRB051021B: Swift XRT refined analysis
  53. GRB051021a: optical observations
  54. GRB 051022: WSRT Radio Detection
  55. GRB 051022, mm counterpart
  56. GRB051022: host galaxy redshift
  57. GRB 051022: Swift/UVOT Upper Limits
  58. GRB051022: Radio Counterpart
  59. GRB051022: IR observations
  60. GRB 051022: SOAR JKs Observations
  61. GRB051021A: Swift XRT refined analysis
  62. Konus-Wind observation of GRB 051022
  63. GRB051022: Optical Observations
  64. GRB 051022: Magellan NIR imaging
  65. GRB 051021: PROMPT RcIc Observations
  66. GRB051021b: Magellan IR Imaging
  67. GRB 051022: Spectral Analysis Indicates That The Spectrum Is Absorbed
  68. GRB 051021: Correction
  69. GRB 051021, SMARTS optical/IR observations
  70. GRB051022: Swift XRT Position
  71. GRB 051021: P200 Ks Observations
  72. IPN triangulation of GRB051022 (=H3950)
  73. GRB 051021: MDM Upper Limit
  74. GRB 051022 (=H3950): SXC Flight Localization is Valid
  75. GRB051021: Swift/UVOT Upper Limits
  76. GRB 051021B: Refined analysis of the Swift-BAT burst
  77. GRB 051022: SSO40 Optical Observations
  78. GRB051022,optical observation
  79. GRB 051022A: ROTSE-III Optical Limits
  80. GRB051022 (=H3590), A GRB Detected By HETE
  81. GRB 051022: Optical observations
  82. GRB 051021,optical observation
  83. GRB051021B: Swift XRT Position
  84. GRB 051021: SOAR NIR Observations
  85. GRB 051021B: Swift detection of a burst
  86. GRB051021: Swift XRT analysis
  87. GRB051021 (=H3947): Refined Analysis
  88. GRB 051021 : optical afterglow observation at Lulin
  89. GRB 051021: Optical observations
  90. GRB 051021: ROTSE-III Confirmation of Optical Counterpart
  91. GRB 051021: Optical observations and candidate afterglow
  92. Swift-BAT trigger 160640 is not a real GRB
  93. GRB051021: A GRB Localized by HETE
  94. Swift-BAT trigger 160619 is not a GRB
  95. Swift-BAT triggered on a posible CR Shower or possible GRB
  96. GRB 050502b: Optical limit
  97. GRB 051016b: Optical limit
  98. Afterglow candidate of GRB 051016B observed at Lulin
  99. GRB 051016b: Gemini Near IR Observations
  100. GRB 051016A: Swift/UVOT upper limits

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