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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"

26483 results found.

  1. GRB051016: Swift XRT refined analysis.
  2. GRB051016: Planned XMM-Newton observation
  3. GRB051016: Swift detection of a burst
  4. Photometric calibration of Swift/UVOT and Re-analysis of Swift/UVOT GRB 050922C data
  5. GRB051006: optical observations
  6. Swift-BAT Trigger 159578 is a possible burst
  7. GRB050805A: Rc optical observations
  8. GRB 051008: - a high redshift high-luminosity burst?
  9. GRB 051008 - a low redshift low-luminosity burst?
  10. GRB051011: bright nebulae near error box
  11. GRB051011: MASTER optical observation
  12. GRB051008: Swift XRT refined analysis
  13. Konus-Wind observation of GRB 051008
  14. GRB 051008: R-band upper limit
  15. GRB051008: Radio Observation
  16. GRB 051008, optical observations
  17. GRB051008: Swift-BAT detection of a bright burst
  18. GRB 051006: P60 Observations
  19. GRB 051006: XRT refined analysis
  20. GRB 050906, summary of radio observations
  21. GRB 051001: Swift XRT refined analysis
  22. GRB 051001, optical observations at Mt. John
  23. GRB050908: optical observations
  24. GRB 050922C: further VLT observations
  25. GRB 050820A: NIR photometry at the TNG
  26. GRB050922C: UVES/VLT high resolution spectroscopy
  27. GRB050925: Swift/XRT limits
  28. GRB/SGR 050925: IR Observations
  29. GRB 050922B: Correction to BAT refined analysis, longer burst
  30. GRB050922B: refined XRT analysis
  31. Konus-Wind observation of GRB 050922C
  32. GRB OT observation
  33. GRB050922C: observation at MonteBoo
  34. GRB 050922B: optical limit
  35. GRB050922C: Optical Observations
  36. GRB 050922C: Swift XRT refined analysis
  37. GRB050922C: optical observations
  38. GRB 050922C: optical obserations
  39. GRB 050922C: Swift detection of a bright burst
  40. GRB 050922C: ROTSE-IIId Refined Analysis
  41. Possible GRB 050922 detected by INTEGRAL
  42. GRB050820B: analysis of the XMM-Newton observation
  43. GRB 050916: Swift-BAT refined analysis
  44. GRB 050918 - A long GRB detected by INTEGRAL
  45. GRB 050915a: Radio Observations
  46. GRB050916 : Swift-XRT refined analysis
  47. GRB 050915B: Swift-BAT refined analysis
  48. GRB 050915a: IR Transient
  49. GRB 050915: Swift XRT refined analysis
  50. GRB 050915: Swift-BAT refined analysis
  51. GRB050915, optical observations
  52. Swift is in normal operation
  53. GRB050911: Swift UVOT followup observations
  54. GRB 050911, optical observations
  55. GRB 050911: Swift-BAT refined analysis
  56. GRB 050911: z~0.16 cluster in the field
  57. GRB050908: detection of Swift/UVOT optical counterpart
  58. GRB 050910a: TAROT early optical limits
  59. RBO GRB 050908 observations
  60. WIRO observations in I of GRB 050908
  61. GRB 050906: Possible X-ray Counterpart
  62. GRB050908: Swift/UVOT Early upper limits
  63. GRB050908 : Swift-XRT refined analysis
  64. GRB 050908: Swift-BAT refined analysis
  65. GRB 050908: Optical observations
  66. Gemini Spectroscopy of GRB 050908
  67. GRB 050908: KAIT observations
  68. GRB 050908: P60 Confirmation of Optical Afterglow
  69. GRB 050908: Optical Observations
  70. GRB 050906: Optical observations at the Very Large Telescope
  71. GRB 050906: Swift-BAT refined analysis
  72. GRB 050906: Swift XRT upper limit
  73. GRB 050906: Radio Observations
  74. GRB 050904: Keck I-band Imaging
  75. GRB050906: P60 Observations
  76. GRB 050904: BOOTES early R-band observation
  77. GRB 050904: photometric redshift
  78. GRB 050904: Swift/UVOT observations
  79. GRB 050904: NIR object inside the XRT error box
  80. GRB 050904: early Swift XRT analysis results
  81. GRB 050904: BAT refined analysis of partial data set
  82. GRB 050904: TAROT optical measurements
  83. GRB 050904: Environmental Constraints
  84. GRB 050904: Possible High-Redshift GRB
  85. GRB 050904: TAROT optical limits
  86. GRB 050827: Optical Limit
  87. Subaru Observations of GRB050724
  88. GRB 050826: Optical Candidate
  89. GRB050824, HETE-2 Observation
  90. GRB 050826: BAT refined analysis
  91. GRB050824: First 2 hours of power low optical decay?
  92. GRB050826: Swift-BAT detection of a long burst
  93. GRB050824: MASTER final analysis of the OT observations
  94. Possible GRB050825:MASTER optical observations
  95. GRB050824: CORRECTION to UVOT observing times
  96. GRB050824: Swift/UVOT detection of fading afterglow
  97. GRB050824, I-band imaging
  98. GRB050824: Radio Observations
  99. GRB 050822: refined XRT analysis
  100. GRB 050824: BAT refined analysis of a soft weak burst

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