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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"

41931 results found.

  1. GRB051028: Swift XRT Position
  2. GRB051028:MASTER observations
  3. GRB 051028 (=H3951): A GRB localized by HETE
  4. GRB051028:MASTER optical observations
  5. GRB051022: Swift XRT measurement of jet break
  6. SGR 1806-20: continued moderate activity seen with INTEGRAL
  7. GRB 051021, Optical Observations
  8. GRB 051022: XRT Refined Spectral and Temporal Analysis
  9. GRB 051022, refined optical astrometry
  10. Chandra Observations of GRB 051022
  11. GRB051012: Swift-XRT analysis
  12. GRB 051022 Chandra Observations scheduled
  13. GRB051021B: Swift XRT refined analysis
  14. GRB051021a: optical observations
  15. GRB 051022: WSRT Radio Detection
  16. GRB 051022, mm counterpart
  17. GRB051022: host galaxy redshift
  18. GRB 051022: Swift/UVOT Upper Limits
  19. GRB051022: Radio Counterpart
  20. GRB051022: IR observations
  21. GRB 051022: SOAR JKs Observations
  22. GRB051021A: Swift XRT refined analysis
  23. Konus-Wind observation of GRB 051022
  24. GRB051022: Optical Observations
  25. GRB 051022: Magellan NIR imaging
  26. GRB 051021: PROMPT RcIc Observations
  27. GRB051021b: Magellan IR Imaging
  28. GRB 051022: Spectral Analysis Indicates That The Spectrum Is Absorbed
  29. GRB 051022, J & K-band observation
  30. GRB 051021, SMARTS optical/IR observations
  31. GRB051022: Swift XRT Position
  32. GRB 051021: P200 Ks Observations
  33. GRB 051021: MDM Upper Limit
  34. GRB 051022 (=H3950): SXC Flight Localization is Valid
  35. GRB 051021B: Refined analysis of the Swift-BAT burst
  36. GRB 051022: SSO40 Optical Observations
  37. GRB051022,optical observation
  38. GRB051022 (=H3590), A GRB Detected By HETE
  39. GRB 051022: Optical observations
  40. GRB 051021,optical observation
  41. GRB 051021: SOAR NIR Observations
  42. GRB 051021B: Swift detection of a burst
  43. GRB051021: Swift XRT analysis
  44. GRB 051021 : optical afterglow observation at Lulin
  45. GRB 051021: Optical observations
  46. GRB 051021: ROTSE-III Confirmation of Optical Counterpart
  47. GRB 051021: Optical observations and candidate afterglow
  48. Swift-BAT trigger 160640 is not a real GRB
  49. GRB051021: A GRB Localized by HETE
  50. Afterglow candidate of GRB 051016B observed at Lulin
  51. GRB 051016b: Gemini Near IR Observations
  52. GRB 051016A: Swift/UVOT upper limits
  53. GRB 051016B: refined analysis of the Swift/XRT data
  54. GRB 051016B: Swift/UVOT detection
  55. GRB 051016B,optical observation
  56. GRB 051016B : Optical follow-up at Lulin
  57. GRB 051016B: Refined analysis of the Swift-BAT burst
  58. GRB 051016B: Swift detection of a soft burst
  59. GRB051016: Swift XRT refined analysis.
  60. GRB 051016: LCO optical and near-IR imaging
  61. GRB 051016: PROMPT Observations
  62. GRB051016: Swift detection of a burst
  63. Photometric calibration of Swift/UVOT and Re-analysis of Swift/UVOT GRB 050922C data
  64. GRB051006: optical observations
  65. GRB 051012: Swift-BAT detection of burst yesterday
  66. Swift-BAT Trigger 159578 is a possible burst
  67. GRB050805A: Rc optical observations
  68. GRB 051006: Swift/UVOT Upper Limits
  69. GRB051008: optical candidate
  70. GRB 051008 - a low redshift low-luminosity burst?
  71. GRB051008: optical observation
  72. GRB051008: Swift XRT refined analysis
  73. GRB051008 - Swift UVOT upper limits
  74. Konus-Wind observation of GRB 051008
  75. GRB051008: Final refined analysis of the Swift-BAT burst
  76. GRB 051008: R-band upper limit
  77. GRB051008: Refined analysis of the Swift-BAT burst
  78. GRB051008: Radio Observation
  79. GRB 051008, optical observations
  80. GRB 051008: Swift UVOT Candidate
  81. GRB051008: Swift-BAT detection of a bright burst
  82. GRB 051006: P60 Observations
  83. GRB 051006: XRT refined analysis
  84. Swift-BAT trigger 158700 is a probable Cosmic Ray Shower Event
  85. GRB 051006: optical observations at Sierra Nevada
  86. GRB051006: Refined analysis of the Swift-BAT burst
  87. GRB051006: Swift detection of a burst
  88. GRB 050906, summary of radio observations
  89. GRB 050925: Second Epoch WSRT Radio Observations
  90. GRB 051001: Swift XRT refined analysis
  91. GRB 051001, optical observations at Mt. John
  92. GRB 051001: I-band limit
  93. GRB 051001: AAT infra-red observations
  94. GRB 051001: Swift-BAT refined analysis
  95. GRB 051001: Swift Detection of a Burst
  96. GRB 051001: ROTSE-III Optical Limits
  97. GRB050908: optical observations
  98. GRB050922C: optical observation
  99. GRB050922B: optical limit
  100. GRB 050922C: further VLT observations

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