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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"

36362 results found.

  1. GRB 051022: SOAR JKs Observations
  2. Konus-Wind observation of GRB 051022
  3. GRB051022: Optical Observations
  4. GRB 051022: Magellan NIR imaging
  5. GRB 051021: PROMPT RcIc Observations
  6. GRB051021b: Magellan IR Imaging
  7. GRB 051022: Spectral Analysis Indicates That The Spectrum Is Absorbed
  8. GRB 051021: Correction
  9. GRB 051022, J & K-band observation
  10. GRB 051021, SMARTS optical/IR observations
  11. GRB 051021: P200 Ks Observations
  12. IPN triangulation of GRB051022 (=H3950)
  13. GRB 051021: MDM Upper Limit
  14. GRB 051022 (=H3950): SXC Flight Localization is Valid
  15. GRB051021: Swift/UVOT Upper Limits
  16. GRB 051021B: Refined analysis of the Swift-BAT burst
  17. GRB 051022: SSO40 Optical Observations
  18. GRB 051022A: ROTSE-III Optical Limits
  19. GRB051022 (=H3590), A GRB Detected By HETE
  20. GRB 051022: Optical observations
  21. GRB 051021,optical observation
  22. GRB051021B: Swift XRT Position
  23. GRB 051021: SOAR NIR Observations
  24. GRB 051021B: Swift detection of a burst
  25. GRB051021 (=H3947): Refined Analysis
  26. GRB 051021 : optical afterglow observation at Lulin
  27. GRB 051021: Optical observations
  28. GRB 051021: ROTSE-III Confirmation of Optical Counterpart
  29. GRB 051021: Optical observations and candidate afterglow
  30. GRB051021.63
  31. GRB051021.6: MASTER optical observation
  32. Swift-BAT trigger 160640 is not a real GRB
  33. GRB051021: A GRB Localized by HETE
  34. Swift-BAT trigger 160619 is not a GRB
  35. Swift-BAT triggered on a posible CR Shower or possible GRB
  36. GRB 050502b: Optical limit
  37. GRB 051016b: Optical limit
  38. Afterglow candidate of GRB 051016B observed at Lulin
  39. GRB 051016b: Gemini Near IR Observations
  40. GRB 051016A: Swift/UVOT upper limits
  41. GRB 051016B: refined analysis of the Swift/XRT data
  42. GRB 051016B: Swift/UVOT detection
  43. GRB 051016B,optical observation
  44. GRB 051016B : Optical follow-up at Lulin
  45. GRB 051016B: Refined analysis of the Swift-BAT burst
  46. GRB 051016B: Swift detection of a soft burst
  47. GRB 051016: Swift-BAT refined analysis
  48. GRB051016: Swift XRT refined analysis.
  49. GRB 051016: LCO optical and near-IR imaging
  50. GRB 051016: PROMPT Observations
  51. GRB051016: Swift detection of a burst
  52. Photometric calibration of Swift/UVOT and Re-analysis of Swift/UVOT GRB 050922C data
  53. GRB051006: optical observations
  54. GRB 051012: Swift-BAT detection of burst yesterday
  55. Swift trigger 159578 is not a burst
  56. GRB 051006: Swift/UVOT Upper Limits
  57. IBAS Alert 2675 : not a GRB
  58. GRB051008: optical candidate
  59. GRB 051008: - a high redshift high-luminosity burst?
  60. GRB 051008 - a low redshift low-luminosity burst?
  61. IBAS Alert 2673: not a real GRB
  62. GRB051011: MASTER optical observation
  63. GRB051008: optical observation
  64. GRB051008: Swift XRT refined analysis
  65. GRB051008 - Swift UVOT upper limits
  66. Konus-Wind observation of GRB 051008
  67. GRB051008: Final refined analysis of the Swift-BAT burst
  68. GRB 051008: R-band upper limit
  69. GRB051008: Radio Observation
  70. GRB 051008: Swift XRT position
  71. GRB 051008, optical observations
  72. GRB 051008: early Swift XRT analysis
  73. GRB 051008: Swift UVOT Candidate
  74. GRB 051006: P60 Observations
  75. grb test
  76. GRB 051006: XRT refined analysis
  77. GRB 051006: optical observations at Sierra Nevada
  78. GRB 051006: XRT position
  79. GRB 050906, summary of radio observations
  80. GRB 050925: Second Epoch WSRT Radio Observations
  81. GRB 051001: Swift XRT refined analysis
  82. GRB 051001, optical observations at Mt. John
  83. GRB 051001: I-band limit
  84. GRB 051001: AAT infra-red observations
  85. GRB 051001: Swift-BAT refined analysis
  86. GRB 051001: Swift Detection of a Burst
  87. GRB 051001: ROTSE-III Optical Limits
  88. GRB050908: optical observations
  89. GRB050922C: optical observation
  90. GRB050922B: optical limit
  91. GRB 050922C: further VLT observations
  92. GRB 050820A: NIR photometry at the TNG
  93. GRB050922C: UVES/VLT high resolution spectroscopy
  94. GRB050925: Swift/XRT limits
  95. GRB/SGR 050925: IR Observations
  96. GRB 050922C: break in the lightcurve
  97. GRB 050925: WSRT Radio Observations
  98. GRB 050925 : I-band observation at Xinglong observatory
  99. GRB050925: Faulkes Telescope North R-band limit
  100. GRB050925: Swift-BAT detection of a short burst

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