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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"

36222 results found.

  1. GRB 051109: Rc and Ic observations
  2. GRB 051109: Swift-BAT refined analysis
  3. GRB 051109a: IR Photometry and Astrometry
  4. GRB 051109a: MDM Observations
  5. GRB 051109A: ROTSE-III Decline rate for Optical Counterpart
  6. GRB 051109a: IR Detections
  7. GRB 051109: ROTSE-III Detection of Possible Counterpart
  8. GRB051105B: Swift/XRT upper limit
  9. GRB051105B: Swift/UVOT upper limit
  10. GRB051103: optical observations
  11. GRB 051103, optical observations
  12. GRB051103: MASTER: OT limit and host galaxy candidates
  13. GRB 051105a, observation from Naini Tal and OSN
  14. GRB 051105A, 2nd epoch optical observations
  15. GRB 051105a: MDM Observations
  16. GRB 051105A: TNG optical observations
  17. GRB051105A: Swift/UVOT Observations
  18. GRB 051105A, radio observations
  19. GRB051103:_MASTER_optical_observations
  20. IPN triangulation and Konus spectrum of the bright short/hard GRB051103
  21. GRB 051105A, optical observations
  22. XRT observations of GRB 051105A
  23. GRB 051105: Swift-BAT improved refined analysis
  24. GRB 051105b: ART optical limits
  25. GRB051105B - A long GRB detected by INTEGRAL
  26. GRB 051105B (INTEGRAL 2701): Optical observation
  27. GRB 051105: Swift-BAT refined analysis
  28. GRB 051105: Optical limit
  29. GRB 051105: Swift detection of a short burst
  30. IBAS Alert 2700: Not a GRB
  31. GRB 051016B host spectroscopy and redshift
  32. GRB051016B: optical observation
  33. Recent GRB UBVRcIc field photometry
  34. Konus-Wind observation of GRB 051028
  35. GRB051028:MASTER correction and final results
  36. GRB 051022: RTT150 optical observations
  37. GRB 051021A: RTT150 optical observations
  38. GRB051028 SARA Observation
  39. GRB051028: optical observations
  40. GRB051028: Swift/UVOT upper limits
  41. GRB051028: confirmation of the afterglow
  42. GRB051028: WHT optical candidate
  43. GRB051028: Swift XRT Position
  44. GRB051028:MASTER observations
  45. GRB 051028 (=H3951): A GRB localized by HETE
  46. GRB051028:MASTER optical observations
  47. GRB 051022: XRT Refined Spectral and Temporal Analysis--Correction
  48. GRB051022: Swift XRT measurement of jet break
  49. GRB051021B: Swift/UVOT Upper limits
  50. GRB 051021, Optical Observations
  51. GRB 051022: XRT Refined Spectral and Temporal Analysis
  52. GRB 051022, refined optical astrometry
  53. Chandra Observations of GRB 051022
  54. GRB 051022 Chandra Observations scheduled
  55. GRB051021a: optical observations
  56. GRB 051022: WSRT Radio Detection
  57. GRB 051022, mm counterpart
  58. GRB051022: host galaxy redshift
  59. GRB 051022: Swift/UVOT Upper Limits
  60. GRB051022: Radio Counterpart
  61. GRB 051022: SOAR JKs Observations
  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 051022, J & K-band observation
  70. GRB 051021, SMARTS optical/IR observations
  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. GRB 051022A: ROTSE-III Optical Limits
  79. GRB051022 (=H3590), A GRB Detected By HETE
  80. GRB 051022: Optical observations
  81. GRB 051021,optical observation
  82. GRB051021B: Swift XRT Position
  83. GRB 051021: SOAR NIR Observations
  84. GRB 051021B: Swift detection of a burst
  85. GRB051021 (=H3947): Refined Analysis
  86. GRB 051021 : optical afterglow observation at Lulin
  87. GRB 051021: Optical observations
  88. GRB 051021: ROTSE-III Confirmation of Optical Counterpart
  89. GRB 051021: Optical observations and candidate afterglow
  90. GRB051021.63
  91. GRB051021.6: MASTER optical observation
  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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