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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"

39368 results found.

  1. Konus-Wind observation of GRB 051028
  2. GRB051028:MASTER correction and final results
  3. GRB 051022: RTT150 optical observations
  4. GRB 051021A: RTT150 optical observations
  5. GRB051028 SARA Observation
  6. GRB051028: optical observations
  7. GRB051028: Swift/UVOT upper limits
  8. GRB051028: confirmation of the afterglow
  9. GRB051028: WHT optical candidate
  10. GRB051028: Swift XRT Position
  11. GRB051028:MASTER observations
  12. GRB 051028 (=H3951): A GRB localized by HETE
  13. GRB051028:MASTER optical observations
  14. GRB 051022: XRT Refined Spectral and Temporal Analysis--Correction
  15. GRB051022: Swift XRT measurement of jet break
  16. GRB051021B: Swift/UVOT Upper limits
  17. GRB 051021, Optical Observations
  18. GRB 051022: XRT Refined Spectral and Temporal Analysis
  19. GRB 051022, refined optical astrometry
  20. Chandra Observations of GRB 051022
  21. GRB 051022 Chandra Observations scheduled
  22. GRB051021a: optical observations
  23. GRB 051022: WSRT Radio Detection
  24. GRB 051022, mm counterpart
  25. GRB051022: host galaxy redshift
  26. GRB 051022: Swift/UVOT Upper Limits
  27. GRB051022: Radio Counterpart
  28. GRB 051022: SOAR JKs Observations
  29. Konus-Wind observation of GRB 051022
  30. GRB051022: Optical Observations
  31. GRB 051022: Magellan NIR imaging
  32. GRB 051021: PROMPT RcIc Observations
  33. GRB051021b: Magellan IR Imaging
  34. GRB 051022: Spectral Analysis Indicates That The Spectrum Is Absorbed
  35. GRB 051021: Correction
  36. GRB 051022, J & K-band observation
  37. GRB 051021, SMARTS optical/IR observations
  38. GRB 051021: P200 Ks Observations
  39. IPN triangulation of GRB051022 (=H3950)
  40. GRB 051021: MDM Upper Limit
  41. GRB 051022 (=H3950): SXC Flight Localization is Valid
  42. GRB051021: Swift/UVOT Upper Limits
  43. GRB 051021B: Refined analysis of the Swift-BAT burst
  44. GRB 051022: SSO40 Optical Observations
  45. GRB 051022A: ROTSE-III Optical Limits
  46. GRB051022 (=H3590), A GRB Detected By HETE
  47. GRB 051022: Optical observations
  48. GRB 051021,optical observation
  49. GRB051021B: Swift XRT Position
  50. GRB 051021: SOAR NIR Observations
  51. GRB 051021B: Swift detection of a burst
  52. GRB051021 (=H3947): Refined Analysis
  53. GRB 051021 : optical afterglow observation at Lulin
  54. GRB 051021: Optical observations
  55. GRB 051021: ROTSE-III Confirmation of Optical Counterpart
  56. GRB 051021: Optical observations and candidate afterglow
  57. GRB051021.63
  58. GRB051021.6: MASTER optical observation
  59. Swift-BAT trigger 160640 is not a real GRB
  60. GRB051021: A GRB Localized by HETE
  61. Swift-BAT trigger 160619 is not a GRB
  62. Swift-BAT triggered on a posible CR Shower or possible GRB
  63. GRB 050502b: Optical limit
  64. GRB 051016b: Optical limit
  65. Afterglow candidate of GRB 051016B observed at Lulin
  66. GRB 051016b: Gemini Near IR Observations
  67. GRB 051016A: Swift/UVOT upper limits
  68. GRB 051016B: refined analysis of the Swift/XRT data
  69. GRB 051016B: Swift/UVOT detection
  70. GRB 051016B,optical observation
  71. GRB 051016B : Optical follow-up at Lulin
  72. GRB 051016B: Refined analysis of the Swift-BAT burst
  73. GRB 051016B: Swift detection of a soft burst
  74. GRB 051016: Swift-BAT refined analysis
  75. GRB051016: Swift XRT refined analysis.
  76. GRB 051016: LCO optical and near-IR imaging
  77. GRB 051016: PROMPT Observations
  78. GRB051016: Swift detection of a burst
  79. Photometric calibration of Swift/UVOT and Re-analysis of Swift/UVOT GRB 050922C data
  80. GRB051006: optical observations
  81. GRB 051012: Swift-BAT detection of burst yesterday
  82. Swift trigger 159578 is not a burst
  83. Swift-BAT Trigger 159578 is a possible burst
  84. GRB 051006: Swift/UVOT Upper Limits
  85. IBAS Alert 2675 : not a GRB
  86. GRB051008: optical candidate
  87. GRB 051008: - a high redshift high-luminosity burst?
  88. GRB 051008 - a low redshift low-luminosity burst?
  89. IBAS Alert 2673: not a real GRB
  90. GRB051011: MASTER optical observation
  91. GRB051008: optical observation
  92. GRB051008: Swift XRT refined analysis
  93. GRB051008 - Swift UVOT upper limits
  94. Konus-Wind observation of GRB 051008
  95. GRB051008: Final refined analysis of the Swift-BAT burst
  96. GRB 051008: R-band upper limit
  97. GRB051008: Radio Observation
  98. GRB 051008: Swift XRT position
  99. GRB 051008, optical observations
  100. GRB 051008: early Swift XRT analysis

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