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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"

39367 results found.

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

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