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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"

41724 results found.

  1. GRB 050128: Swift XRT prompt afterglow position
  2. HETE #3667: P60 Observations
  3. GRB 050124: K-band afterglow observations
  4. GRB050126: Burst Parameters Measured by BAT
  5. GRB050126: MASTER optical observations
  6. GRB 050126: Detection of NIR afterglow with Keck/NIRC
  7. GRB 050126: Prompt XRT detection and localization
  8. GRB 050124: NIR afterglow confirmed with Keck/NIRC
  9. GRB050124: No Swift UVOT Detection of Afterglow Emission
  10. GRB 050124, SMARTS optical/IR observations
  11. GRB 050117a: Radio Observations
  12. GRB 050124 I-band observation
  13. GRB 050124: NIR Candidates from Keck/NIRC
  14. GRB050124,optical observation
  15. GRB 050124 : Lulin R-band follow-up observation
  16. GRB050124: Updated Swift XRT Position and Fluxes
  17. GRB 050124: Swift XRT Detection of X-ray Afterglow Emission
  18. GRB050124: Refined BAT position, spectral and fluence information
  19. GRB050124: Swift-BAT position of a double-peaked burst
  20. GRB 050123 : I-band follow-up observation
  21. GRB050123,optical observation
  22. GRB 050123: KAIT observations
  23. GRB050123: P60 Observations
  24. GRB 050123(=H3666): A GRB Localized in Real Time by HETE
  25. CFHTLS optical transient unlikely to be a GRB
  26. Unusual optical transient (GRB ???)
  27. GRB050117a: Radio Observations
  28. GRB 041224 and GRB 041226: BOOTES-2 simultaneous observations
  29. GRB050117: Palomar WIRC Ks-band observations
  30. GRB050117b: Swift-BAT detection of a weak burst
  31. GRB050117: optical observation
  32. GRB 050117, I-band observations
  33. GRB 050117: Optical observation
  34. GRB050117: Refined XRT position
  35. GRB050117: MASTER optical observations
  36. MASTER:GRB050117 SWIFT
  37. GRB050117: Swift-BAT detection of a long multi-peaked burst
  38. SGR 1806-20: Further VLA Observations
  39. SGR 1806-20: Further low frequency GMRT results
  40. SGR 1806-20: Further VLA Observations
  41. SGR1806-20: Swift-BAT observations of two additional bursts
  42. SGR1806: Optical Transient Candidates in SOHO/LASCO Images
  43. Further VLA observations of SGR 1806-20
  44. Further ATCA observations of SGR 1806-20
  45. Fourth Epoch VLA observations of SGR 1806-20
  46. SGR 1806-20: Low frequency GMRT results; submission to GCN circulars
  47. SGR 1806-20: Temporal and Spectral behavior of radio transient
  48. ATCA observations of SGR 1806-20
  49. SGR 1806-20, RHESSI observations of the 041227 giant flare
  50. Third epoch observations of SGR 1806-20 with VLA
  51. Second Epoch VLA observations of SGR 1806-20
  52. Second-epoch VLA observations of SGR 1806-20
  53. SGR1806: Detection of a Sudden Ionospheric Disturbance
  54. VLA observations of SGR 1806-20
  55. SGR1806 VLA Observations
  56. VLA observations of SGR 1806-20
  57. SGR1806-20: RXTE-PCA observation of the 041227 super-flare
  58. GRB 041217: Optical observations
  59. SGR1806-20: Swift-BAT observation of the 041227 super-flare
  60. GRB041219, early time observations
  61. The giant outburst from SGR 1806-20
  62. IPN localization of giant flare from SGR1806-20
  63. Giant flare from SGR 1806-20 detected by INTEGRAL
  64. GRB041228: ROTSE-III Optical Observations
  65. GRB041228: Swift-BAT detection of a burst
  66. GRB041219; RXTE ASM Observations
  67. NIR Observations of GRB 041219
  68. GRB041226: ROTSE-III Optical Observations
  69. GRB041226: Swift-BAT detection of a burst
  70. GRB041223: decay of the afterglow
  71. GRB041224: ROTSE-III Optical Observations
  72. GRB 041224: near-infrared observations with REM
  73. GRB 041223 Fluence measured by Swift-BAT
  74. GRB041224: Swift-BAT detection of a soft burst
  75. GRB041223: optical and NIR observations with REM
  76. Swift-BAT Time History of GRB041219
  77. GRB 041219: TAROT optical observations
  78. GRB 041218: TAROT optical observations
  79. GRB 041223: J-band observations of the afterglow
  80. GRB 041223: Detection of Optical Transient with LCO40
  81. GRB041223: Swift XRT Detection of X-ray Afterglow Emission
  82. GRB 041219c: PROMPT Observations
  83. GRB041223: ROTSE-III Optical Observations
  84. GRB041223: Swift-BAT detection of a bright long burst
  85. GRB 041218: optical observations
  86. Very high activity of SGR 1806-20
  87. GRB 041219: Second Epoch WSRT Radio Observations
  88. GRB 041219: WSRT Radio Afterglow Detection
  89. GRB 041219: Keck IR Observations and Astrometric Refinement of the
  90. GRB 041218: Optical observations
  91. GRB 041219 : optical follow-up observations
  92. GRB041220: Swift-BAT burst
  93. Deep RAPTOR observations during GRB 041219
  94. GRB 041218 Optical Observations
  95. GRB 041219 Optical Observations
  96. GRB041219c: Third Burst in One Day from Swift-BAT
  97. GRB041219: Optical Afterglow Detection
  98. GRB041219: Continued NIR Observations
  99. GRB041219b: A Swift-BAT burst
  100. GRB 041219 ,optical observation

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