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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"

41917 results found.

  1. GRB 051022: WSRT Radio Detection
  2. GRB 051022, mm counterpart
  3. GRB051022: host galaxy redshift
  4. GRB 051022: Swift/UVOT Upper Limits
  5. GRB051022: Radio Counterpart
  6. GRB051022: IR observations
  7. GRB 051022: SOAR JKs Observations
  8. GRB051021A: Swift XRT refined analysis
  9. Konus-Wind observation of GRB 051022
  10. GRB051022: Optical Observations
  11. GRB 051022: Magellan NIR imaging
  12. GRB 051021: PROMPT RcIc Observations
  13. GRB051021b: Magellan IR Imaging
  14. GRB 051022: Spectral Analysis Indicates That The Spectrum Is Absorbed
  15. GRB 051022, J & K-band observation
  16. GRB 051021, SMARTS optical/IR observations
  17. GRB051022: Swift XRT Position
  18. GRB 051021: P200 Ks Observations
  19. GRB 051021: MDM Upper Limit
  20. GRB 051022 (=H3950): SXC Flight Localization is Valid
  21. GRB 051021B: Refined analysis of the Swift-BAT burst
  22. GRB 051022: SSO40 Optical Observations
  23. GRB051022,optical observation
  24. GRB051022 (=H3590), A GRB Detected By HETE
  25. GRB 051022: Optical observations
  26. GRB 051021,optical observation
  27. GRB 051021: SOAR NIR Observations
  28. GRB 051021B: Swift detection of a burst
  29. GRB051021: Swift XRT analysis
  30. GRB 051021 : optical afterglow observation at Lulin
  31. GRB 051021: Optical observations
  32. GRB 051021: ROTSE-III Confirmation of Optical Counterpart
  33. GRB 051021: Optical observations and candidate afterglow
  34. Swift-BAT trigger 160640 is not a real GRB
  35. GRB051021: A GRB Localized by HETE
  36. Afterglow candidate of GRB 051016B observed at Lulin
  37. GRB 051016b: Gemini Near IR Observations
  38. GRB 051016A: Swift/UVOT upper limits
  39. GRB 051016B: refined analysis of the Swift/XRT data
  40. GRB 051016B: Swift/UVOT detection
  41. GRB 051016B,optical observation
  42. GRB 051016B : Optical follow-up at Lulin
  43. GRB 051016B: Refined analysis of the Swift-BAT burst
  44. GRB 051016B: Swift detection of a soft burst
  45. GRB051016: Swift XRT refined analysis.
  46. GRB 051016: LCO optical and near-IR imaging
  47. GRB 051016: PROMPT Observations
  48. GRB051016: Swift detection of a burst
  49. Photometric calibration of Swift/UVOT and Re-analysis of Swift/UVOT GRB 050922C data
  50. GRB051006: optical observations
  51. GRB 051012: Swift-BAT detection of burst yesterday
  52. Swift-BAT Trigger 159578 is a possible burst
  53. GRB050805A: Rc optical observations
  54. GRB 051006: Swift/UVOT Upper Limits
  55. GRB051008: optical candidate
  56. GRB 051008 - a low redshift low-luminosity burst?
  57. GRB051008: optical observation
  58. GRB051008: Swift XRT refined analysis
  59. GRB051008 - Swift UVOT upper limits
  60. Konus-Wind observation of GRB 051008
  61. GRB051008: Final refined analysis of the Swift-BAT burst
  62. GRB 051008: R-band upper limit
  63. GRB051008: Refined analysis of the Swift-BAT burst
  64. GRB051008: Radio Observation
  65. GRB 051008, optical observations
  66. GRB 051008: Swift UVOT Candidate
  67. GRB051008: Swift-BAT detection of a bright burst
  68. GRB 051006: P60 Observations
  69. GRB 051006: XRT refined analysis
  70. Swift-BAT trigger 158700 is a probable Cosmic Ray Shower Event
  71. GRB 051006: optical observations at Sierra Nevada
  72. GRB051006: Refined analysis of the Swift-BAT burst
  73. GRB051006: Swift detection of a burst
  74. GRB 050906, summary of radio observations
  75. GRB 050925: Second Epoch WSRT Radio Observations
  76. GRB 051001: Swift XRT refined analysis
  77. GRB 051001, optical observations at Mt. John
  78. GRB 051001: I-band limit
  79. GRB 051001: AAT infra-red observations
  80. GRB 051001: Swift-BAT refined analysis
  81. GRB 051001: Swift Detection of a Burst
  82. GRB 051001: ROTSE-III Optical Limits
  83. GRB050908: optical observations
  84. GRB050922C: optical observation
  85. GRB050922B: optical limit
  86. GRB 050922C: further VLT observations
  87. GRB 050820A: NIR photometry at the TNG
  88. GRB050922C: UVES/VLT high resolution spectroscopy
  89. GRB050925: Swift/XRT limits
  90. GRB/SGR 050925: IR Observations
  91. GRB 050922C: break in the lightcurve
  92. GRB 050925: WSRT Radio Observations
  93. GRB050925: Swift UVOT upper limits
  94. Refined analysis of the Swift-BAT soft short burst
  95. GRB 050925 : I-band observation at Xinglong observatory
  96. GRB050925: Faulkes Telescope North R-band limit
  97. GRB050925: Swift-BAT detection of a short burst
  98. GRB050922C: TNG spectroscopic observations
  99. GRB050922B: refined XRT analysis
  100. Konus-Wind observation of GRB 050922C

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