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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"

24437 results found.

  1. GRB050925: Swift-BAT detection of a short burst
  2. GRB050922C: TNG spectroscopic observations
  3. Konus-Wind observation of GRB 050922C
  4. GRB050922B: Swift UVOT early upper limits.
  5. GRB OT observation
  6. GRB050922C: observation at MonteBoo
  7. GRB050922C: Optical Observations
  8. GRB 050922C: Swift XRT refined analysis
  9. GRB 050922C: Swift-BAT refined analysis
  10. GRB 050922B: Swift-BAT refined analysis
  11. GRB050922C: optical observations
  12. GRB 050922C: ROTSE-III Detection of Possible Counterpart
  13. GRB 050922B: ROTSE-III Optical Limits
  14. GRB 050922B,optical observation
  15. GRB050922B: Swift-BAT detection of a weak long burst
  16. Possible GRB 050922 detected by INTEGRAL
  17. GRB050820B: analysis of the XMM-Newton observation
  18. GRB 050916: Swift-BAT refined analysis
  19. GRB 050918 - A long GRB detected by INTEGRAL
  20. GRB 050915b, SMARTS optical/IR observations of the XRT position
  21. GRB 050915B: Swift-BAT refined analysis
  22. GRB 050915: IR Observations
  23. GRB 050915: Swift XRT refined analysis
  24. GRB 050915: Swift-BAT refined analysis
  25. GRB050915: P60 Optical Observations
  26. GRB050915, optical observations
  27. GRB 050915: ROTSE-III optical limits
  28. GRB050911: Upper limit on X-ray afterglow
  29. Swift-BAT trigger 155072 is probably not a GRB
  30. GRB 050908: DEIMOS spectrum and further analysis
  31. Swift is in normal operation
  32. GRB050911: Swift UVOT followup observations
  33. GRB 050911: Swift-BAT refined analysis
  34. GRB050911: Swift-BAT detection of a long burst
  35. GRB050908: detection of Swift/UVOT optical counterpart
  36. RBO GRB 050908 observations
  37. WIRO observations in I of GRB 050908
  38. GRB 050906: Possible X-ray Counterpart
  39. GRB050908: Swift/UVOT Early upper limits
  40. GRB 050908: Swift-BAT refined analysis
  41. GRB 050908: Prompt PROMPT Observations
  42. GRB050904: CrAO optical observations
  43. GRB 050906: Swift-BAT refined analysis
  44. GRB050906: P60 Observations
  45. GRB 050904: BOOTES early R-band observation
  46. GRB 050904: Did SWIFT/XRT see the prompt GRB emission ?
  47. GRB 050904: More SOAR
  48. GRB 050904: Swift/UVOT observations
  49. GRB 050904: early Swift XRT analysis results
  50. GRB 050904: SOAR YJ and PROMPT Ic Observations
  51. GRB 050904: SOAR/PROMPT Observations
  52. GRB050904: P60 Observations
  53. GRB050904: Swift-BAT detection of a probable burst
  54. Swift-BAT triggers 153461-153465 are not GRBs
  55. IBAS Alerts 2641 and 2642: not a real GRB
  56. GRB 050827: P200 NIR Observations
  57. GRB050827: Swift/UVOT upper limits
  58. GRB 050827: Swift-BAT refined analysis
  59. Subaru Observations of GRB050724
  60. GRB 050826: Optical Candidate
  61. GRB 050826: Swift XRT preliminary analysis results
  62. GRB050826: Swift/UVOT early upper limits
  63. GRB050824: First 2 hours of power low optical decay?
  64. GRB050824: MASTER final analysis of the OT observations
  65. Possible GRB050825:MASTER optical observations
  66. GRB050824: CORRECTION to UVOT observing times
  67. Swift-BAT trigger 152038 is probably not a GRB
  68. GRB050824: Swift/UVOT detection of fading afterglow
  69. GRB050824, I-band imaging
  70. GRB 050824: BAT refined analysis of a soft weak burst
  71. GRB050824: MASTER:OT decay
  72. GRB050824: MASTER observation OT
  73. GRB050805a: MASTER optical candidat
  74. GRB 050824: ROTSE-III Optical Limits
  75. GRB050820a: PROMPT RcIc Observations
  76. XRF050509c: Radio upper limits from GMRT
  77. GRB050822: Swift/UVOT upper limits
  78. GRB 050820A BAT observations of second, larger episode of emission
  79. GRB 050822: Swift-BAT refined analysis
  80. GRB 050820a - corrections to GCN 3846
  81. GRB 050822: ROTSE-III Prompt Optical Limits
  82. GRB050825a - very long GRB like GRB041219a? (Konus-Wind observation)
  83. GRB 050820B: Swift XRT position
  84. Swift/UVOT photometry of GRB050820
  85. GRB050820: Optical afterglow from P60
  86. Swift-BAT trigger 150993 is not a GRB
  87. Swift Trigger 150823 is HETE J1900.1-2455
  88. GRB050817: Negative Optical Observations
  89. GRB050815: Optical afterglow detection by Swift UVOT
  90. GRB 050815: ROTSE-III Optical Limits
  91. GRB050815: Swift XRT afterglow localization
  92. GRB050814: SWIFT/UVOT observation
  93. GRB050813: Gemini Imaging
  94. GRB 050814: Swift XRT Afterglow Localization
  95. GRB 050813: Swift-BAT refined analysis
  96. GRB050813: SWIFT/UVOT observation
  97. GRB 050813: Swift XRT afterglow localization
  98. RBO GRB 050714A and GRB 050716 observations
  99. GRB 050813: Possible Short Swift-BAT GRB
  100. GRB050807(=H3889): An X-Ray Rich GRB Localized by HETE

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