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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"

37930 results found.

  1. GRB 050215b, BOOTES-1B optical limit
  2. GRB050215B: ROTSE-III optical observations
  3. GRB050215A: ROTSE-III Optical Observations
  4. GRB050209: TAROT optical observations
  5. GRB 050209(=U11568): Duration and spectrum
  6. short/hard GRB 050202, optical observations
  7. GRB050209: REM optical observations
  8. GRB 050209 I-band observation
  9. GRB 050209 Optical observations
  10. GRB050209: P60 Optical Observations
  11. GRB050209 (=U11568): A Long GRB Detected by HETE
  12. GRB 050209: Optical observation
  13. GRB 050128: Radio observations
  14. Further analysis of the short Swift-BAT GRB 050202
  15. GRB 050202: Second epoch radio observations
  16. GRB 050129: Optical observations
  17. GRB050202: Radio Observations
  18. GRB 050202: Optical observations with LCO40
  19. GRB 050202: Short burst detected by Swift-BAT
  20. GRB 050128 Optical observation with REM
  21. GRB 050129: a weak long GRB detected with INTEGRAL
  22. SGR1806-20: Swift-BAT detection of a large normal burst
  23. GRB050128: Faulkes Telescope South observations
  24. GRB 050124: Radio Observations
  25. GRB 050128: near-infrared observations with REM
  26. GRB050128,optical observations
  27. GRB 050126: A NIR afterglow candidate in the revised XRT error circle
  28. GRB050126: Updated Swift XRT Position
  29. GRB 050126: Radio Observations
  30. GRB050128 Swift-BAT observations
  31. GRB 050128: Swift XRT prompt afterglow position
  32. GRB 050124: K-band afterglow observations
  33. GRB050126: MASTER optical limit for KECK OT
  34. GRB050126: Burst Parameters Measured by BAT
  35. GRB050126: MASTER optical observations
  36. GRB 050126: Detection of NIR afterglow with Keck/NIRC
  37. GRB 050126: Prompt XRT detection and localization
  38. GRB 050124: NIR afterglow confirmed with Keck/NIRC
  39. GRB050124: No Swift UVOT Detection of Afterglow Emission
  40. GRB 050124, SMARTS optical/IR observations
  41. GRB 050117a: Radio Observations
  42. GRB 050124 I-band observation
  43. GRB 050124: NIR Candidates from Keck/NIRC
  44. GRB050124,optical observation
  45. GRB 050124 : Lulin R-band follow-up observation
  46. GRB050124: Updated Swift XRT Position and Fluxes
  47. GRB 050124: Swift XRT Detection of X-ray Afterglow Emission
  48. GRB050124: Refined BAT position, spectral and fluence information
  49. GRB050124: Swift-BAT position of a double-peaked burst
  50. GRB 050123 : I-band follow-up observation
  51. GRB050123: optical limit 1.8h before GRB
  52. GRB050123,optical observation
  53. GRB 050123: KAIT observations
  54. GRB050123: P60 Observations
  55. GRB 050123(=H3666): A GRB Localized in Real Time by HETE
  56. CFHTLS optical transient unlikely to be a GRB
  57. Unusual optical transient (GRB ???)
  58. GRB050117a: Radio Observations
  59. GRB050117a: Refined analysis
  60. GRB 041224 and GRB 041226: BOOTES-2 simultaneous observations
  61. GRB050117b: Swift-BAT detection of a weak burst
  62. GRB050117: optical observation
  63. GRB 050117, I-band observations
  64. GRB 050117: Optical observation
  65. GRB050117: Refined XRT position
  66. GRB050117: MASTER optical observations
  67. MASTER:GRB050117 SWIFT
  68. GRB050117: Swift-BAT detection of a long multi-peaked burst
  69. GRB050117: Swift XRT Position
  70. Triangulation of Short Hard GRB050112 (large error box)
  71. SGR1806-20: Swift-BAT observations of two additional bursts
  72. SGR1806: Optical Transient Candidates in SOHO/LASCO Images
  73. SGR 1806-20 and extragalactic short-duration GRBs
  74. SGR 1806-20: Temporal and Spectral behavior of radio transient
  75. SGR 1806-20, RHESSI observations of the 041227 giant flare
  76. SGR1806: Detection of a Sudden Ionospheric Disturbance
  77. SGR1806-20: RXTE-PCA observation of the 041227 super-flare
  78. GRB 041217: Optical observations
  79. SGR1806-20: Swift-BAT observation of the 041227 super-flare
  80. GRB041219, early time observations
  81. IPN localization of giant flare from SGR1806-20
  82. GRB041228: ROTSE-III Optical Observations
  83. GRB041228: Swift-BAT detection of a burst
  84. GRB041219; RXTE ASM Observations
  85. NIR Observations of GRB 041219
  86. GRB041226: ROTSE-III Optical Observations
  87. GRB041226: Swift-BAT detection of a burst
  88. GRB041223: decay of the afterglow
  89. GRB041224: ROTSE-III Optical Observations
  90. GRB 041224: near-infrared observations with REM
  91. GRB 041223: XRT afterglow spectrum and light curve
  92. GRB 041223 Fluence measured by Swift-BAT
  93. GRB041224: Swift-BAT detection of a soft burst
  94. GRB041223: optical and NIR observations with REM
  95. Swift-BAT Time History of GRB041219
  96. GRB 041219: TAROT optical observations
  97. GRB 041218: TAROT optical observations
  98. GRB 041223: J-band observations of the afterglow
  99. GRB 041223: Detection of Optical Transient with LCO40
  100. GRB041223: Swift XRT Detection of X-ray Afterglow Emission

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