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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.

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subject:"Swift"
body:"GRB"
submitter:"Judith Racusin"

37216 results found.

  1. GRB 050219b: Optical and near-IR observations from LCO
  2. GRB 050219b: Refined XRT position
  3. GRB 050219b: Swift-BAT detection of a burst
  4. GRB 050219b: CORRECTION: Swift XRT Position
  5. GRB 050219b: Swift XRT Position
  6. GRB 050219a, optical observations
  7. GRB 050219a: Refined XRT position
  8. GRB 050219: Swift-BAT detection of a burst
  9. GRB050215b: Swift UVOT Detection of Afterglow Emission
  10. GRB 050219: Prompt X-ray position
  11. GRB 050215B: Radio Observations
  12. GRB 050215b: XRT confirmation of IR afterglow candidate
  13. GRB050215b: P60 Optical Observations
  14. GRB 050215b: Swift XRT Source Variability
  15. GRB 050215B: candidate afterglow
  16. GRB 050215b : Lulin follow-up observation
  17. GRB 050215b, BOOTES-2 simultaneous optical observations
  18. GRB 050215B: UKIRT K-band imaging
  19. GRB 050215b: Swift XRT Observations
  20. GRB 050215b, BOOTES-1B optical limit
  21. GRB050215B: ROTSE-III optical observations
  22. GRB050215A: ROTSE-III Optical Observations
  23. GRB050209: TAROT optical observations
  24. GRB 050209(=U11568): Duration and spectrum
  25. short/hard GRB 050202, optical observations
  26. GRB050209: REM optical observations
  27. GRB 050209 I-band observation
  28. GRB 050209 Optical observations
  29. GRB050209: P60 Optical Observations
  30. GRB050209 (=U11568): A Long GRB Detected by HETE
  31. GRB 050209: Optical observation
  32. GRB 050128: Radio observations
  33. Further analysis of the short Swift-BAT GRB 050202
  34. GRB 050202: Second epoch radio observations
  35. GRB 050129: Optical observations
  36. GRB050202: Radio Observations
  37. GRB 050202: Optical observations with LCO40
  38. GRB 050202: Short burst detected by Swift-BAT
  39. GRB 050128 Optical observation with REM
  40. GRB 050129: a weak long GRB detected with INTEGRAL
  41. GRB050128: Faulkes Telescope South observations
  42. GRB 050124: Radio Observations
  43. GRB 050128: near-infrared observations with REM
  44. GRB050128,optical observations
  45. GRB 050126: A NIR afterglow candidate in the revised XRT error circle
  46. GRB 050126: Radio Observations
  47. GRB050128 Swift-BAT observations
  48. GRB 050128: Swift XRT prompt afterglow position
  49. GRB 050124: K-band afterglow observations
  50. GRB050126: MASTER optical limit for KECK OT
  51. GRB050126: MASTER optical observations
  52. GRB 050126: Detection of NIR afterglow with Keck/NIRC
  53. GRB 050126: Prompt XRT detection and localization
  54. GRB 050124: NIR afterglow confirmed with Keck/NIRC
  55. GRB 050124, SMARTS optical/IR observations
  56. GRB 050117a: Radio Observations
  57. GRB 050124 I-band observation
  58. GRB 050124: NIR Candidates from Keck/NIRC
  59. GRB050124,optical observation
  60. GRB 050124 : Lulin R-band follow-up observation
  61. GRB050124: Updated Swift XRT Position and Fluxes
  62. GRB 050124: Swift XRT Detection of X-ray Afterglow Emission
  63. GRB050124: Refined BAT position, spectral and fluence information
  64. GRB 050123 : I-band follow-up observation
  65. GRB050123: optical limit 1.8h before GRB
  66. GRB050123,optical observation
  67. GRB 050123: KAIT observations
  68. GRB050123: P60 Observations
  69. GRB 050123(=H3666): A GRB Localized in Real Time by HETE
  70. CFHTLS optical transient unlikely to be a GRB
  71. Unusual optical transient (GRB ???)
  72. GRB050117a: Radio Observations
  73. GRB 041224 and GRB 041226: BOOTES-2 simultaneous observations
  74. GRB 050117, I-band observations
  75. GRB 050117: Optical observation
  76. GRB050117: Refined XRT position
  77. GRB050117: MASTER optical observations
  78. MASTER:GRB050117 SWIFT
  79. GRB050117: Swift-BAT detection of a long multi-peaked burst
  80. SGR 1806-20: RXTE/PCA pulse frequency during flare
  81. Triangulation of Short Hard GRB050112 (large error box)
  82. SGR1806: Optical Transient Candidates in SOHO/LASCO Images
  83. Further VLA observations of SGR 1806-20
  84. SGR 1806-20 and extragalactic short-duration GRBs
  85. Further ATCA observations of SGR 1806-20
  86. SGR 1806-20: Temporal and Spectral behavior of radio transient
  87. SGR 1806-20, RHESSI observations of the 041227 giant flare
  88. SGR1806: Detection of a Sudden Ionospheric Disturbance
  89. SGR1806 VLA Observations
  90. GRB 041217: Optical observations
  91. GRB041219, early time observations
  92. IPN localization of giant flare from SGR1806-20
  93. Giant flare from SGR 1806-20 detected by INTEGRAL
  94. GRB041228: ROTSE-III Optical Observations
  95. GRB041219; RXTE ASM Observations
  96. NIR Observations of GRB 041219
  97. GRB041226: ROTSE-III Optical Observations
  98. GRB041223: decay of the afterglow
  99. GRB041224: ROTSE-III Optical Observations
  100. GRB 041224: near-infrared observations with REM

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