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GCN Circulars

GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. 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"

19534 results found.

  1. GRB 050915: IR Observations
  2. GRB 050915: Swift XRT refined analysis
  3. GRB 050915: Swift-BAT refined analysis
  4. GRB050915, optical observations
  5. GRB050915: XRT position
  6. GRB 050915: ROTSE-III optical limits
  7. GRB 050915: Swift detection of a GRB
  8. GRB050911: Upper limit on X-ray afterglow
  9. Swift-BAT trigger 155072 ground analysis
  10. Swift-BAT trigger 155072 is probably not a GRB
  11. GRB050914: XRT position probably due to cosmic ray
  12. Swift is in normal operation
  13. GRB050911: Swift UVOT followup observations
  14. GRB 050911, optical content of Swift/XRT error box
  15. GRB050911: Swift-XRT position
  16. GRB 050911, optical observations
  17. GRB 050911: Swift-BAT refined analysis
  18. Later Swift-BAT triggers 154632 and 154633 RETRACTION
  19. GRB050911: Swift-BAT detection of a long burst
  20. GRB050908: detection of Swift/UVOT optical counterpart
  21. RBO GRB 050908 observations
  22. WIRO observations in I of GRB 050908
  23. GRB 050906: Possible X-ray Counterpart
  24. GRB050908: Swift/UVOT Early upper limits
  25. GRB050908 : Swift-XRT refined analysis
  26. GRB 050908: Swift-BAT refined analysis
  27. GRB 050908: Optical observations
  28. Gemini Spectroscopy of GRB 050908
  29. GRB 050908 : Swift XRT position
  30. GRB 050908: KAIT observations
  31. GRB 050908: P60 Confirmation of Optical Afterglow
  32. GRB 050908: Swift detection of a burst
  33. Swift trigger 154073 is not a GRB
  34. GRB050904: CrAO optical observations
  35. GRB 050904 BAT refined analysis of complete data set
  36. GRB 050906: MARGE Optical Limits
  37. GRB 050906: Swift-BAT refined analysis
  38. GRB 050906: Swift XRT upper limit
  39. GRB050906: P60 Observations
  40. GRB 050904: Did SWIFT/XRT see the prompt GRB emission ?
  41. GRB 050906: Bright galaxy in BAT error box
  42. GRB 050906: Swift/BAT Detection of a possible burst
  43. GRB 050904: Swift/UVOT observations
  44. GRB 050904: early Swift XRT analysis results
  45. GRB 050904: BAT refined analysis of partial data set
  46. GRB050904: P60 Observations
  47. GRB 050904: TAROT optical limits
  48. GRB050904: Swift-BAT detection of a probable burst
  49. Swift-BAT triggers 153461-153465 are not GRBs
  50. Retraction of Swift-BAT trigger #153355
  51. GRB 050824: MDM Observations
  52. GRB 050827: Swift XRT preliminary analysis results
  53. Swift Trigger #152652 is not a GRB
  54. GRB050827: Swift/UVOT upper limits
  55. GRB 050827: Optical Limit
  56. GRB 050827: XRT possible afterglow detection
  57. GRB050827: RTT150 optical observations
  58. GRB 050827: Swift-BAT refined analysis
  59. GRB050827: Swift-BAT detection of a burst
  60. GRB 050826: Optical Candidate
  61. GRB050824, HETE-2 Observation
  62. GRB 050826: Swift XRT preliminary analysis results
  63. GRB 050826: BAT refined analysis
  64. GRB050826: Swift/UVOT early upper limits
  65. GRB050824: First 2 hours of power low optical decay?
  66. GRB 050826: Swift XRT position
  67. GRB050826: Swift-BAT detection of a long burst
  68. GRB050824: MASTER final analysis of the OT observations
  69. Possible GRB050825:MASTER optical observations
  70. Swift-BAT trigger 152038 is definitely not a GRB
  71. GRB050824: CORRECTION to UVOT observing times
  72. Swift-BAT trigger 152038 is probably not a GRB
  73. GRB050824: Swift/UVOT detection of fading afterglow
  74. GRB050824: decay of the XRT light curve and updated X-ray spectrum
  75. GRB050824, I-band imaging
  76. GRB 050822: refined XRT analysis
  77. GRB 050824: XRT refined analysis and possible afterglow detection
  78. GRB 050824: BAT refined analysis of a soft weak burst
  79. GRB050824: MASTER:OT decay
  80. GRB050824: MASTER observation OT
  81. GRB050805a: MASTER optical candidat
  82. GRB 050824: ROTSE-III Optical Limits
  83. GRB050824: Swift-BAT detection of a burst
  84. GRB050822: Swift/UVOT upper limits
  85. GRB 050820A BAT observations of second, larger episode of emission
  86. GRB 050822: Swift-BAT refined analysis
  87. GRB 050820a - corrections to GCN 3846
  88. Swift/UVOT UV Photometry of GRB 050820B
  89. GRB 050822: ROTSE-III Prompt Optical Limits
  90. GRB 050822: Swift detection of a long burst
  91. Correction to Eiso calculation in GCN 3835 on GRB 050820A
  92. GRB050825a - very long GRB like GRB041219a? (Konus-Wind observation)
  93. GRB050820a BVRcIc field photometry
  94. GRB050820B XMM-Newton observation
  95. GRB 050820a: NIR Observations by WIRO
  96. GRB 050820B: Swift XRT position
  97. GRB050820B: Refined analysis of the Swift-BAT burst
  98. GRB050820B: BAT-Swift detection of a bright GRB
  99. Swift/UVOT photometry of GRB050820
  100. GRB050820: refined XRT analysis

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