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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"

36245 results found.

  1. XMM-Newton Images of GRB 050223
  2. GRB 050219b: candidate NIR afterglow
  3. IBAS GRB Alert #2321
  4. GRB 050223: optical observations
  5. INTEGRAL detection of GRB 050223
  6. GRB 050223 : Planned XMM-Newton observation
  7. GRB050223: ROTSE-III Optical Observations
  8. GRB 050223 Swift/BAT detection of a burst
  9. GRB 050223: Swift XRT Position
  10. HETE-2 Observations of GRB 050215b (=U11570): A Likely X-Ray Flash
  11. GRB 050219b: CORRECTION to refined XRT position
  12. GRB 050219a: Optical observations from LCO
  13. GRB 050219b: Optical and near-IR observations from LCO
  14. GRB 050219b: Refined XRT position
  15. GRB 050219b: Swift-BAT detection of a burst
  16. GRB 050219b: CORRECTION: Swift XRT Position
  17. GRB 050219b: Swift XRT Position
  18. GRB 050219a, optical observations
  19. GRB 050219a: Refined XRT position
  20. GRB 050219: Swift-BAT detection of a burst
  21. GRB050215b: Swift UVOT Detection of Afterglow Emission
  22. GRB 050219: Prompt X-ray position
  23. GRB 050215B: Radio Observations
  24. GRB 050215b: XRT confirmation of IR afterglow candidate
  25. GRB050215b: P60 Optical Observations
  26. GRB 050215b: Swift XRT Source Variability
  27. GRB 050215B: candidate afterglow
  28. GRB 050215b : Lulin follow-up observation
  29. GRB 050215b, BOOTES-2 simultaneous optical observations
  30. GRB 050215B: UKIRT K-band imaging
  31. GRB 050215b: Swift XRT Observations
  32. GRB 050215b, BOOTES-1B optical limit
  33. GRB050215A: ROTSE-III Optical Observations
  34. GRB050209: TAROT optical observations
  35. GRB 050209(=U11568): Duration and spectrum
  36. short/hard GRB 050202, optical observations
  37. GRB050209: REM optical observations
  38. GRB 050209 I-band observation
  39. GRB 050209 Optical observations
  40. GRB050209: P60 Optical Observations
  41. GRB050209 (=U11568): A Long GRB Detected by HETE
  42. GRB 050209: Optical observation
  43. GRB 050128: Radio observations
  44. Further analysis of the short Swift-BAT GRB 050202
  45. GRB 050202: Second epoch radio observations
  46. GRB 050129: Optical observations
  47. GRB050202: Radio Observations
  48. GRB 050202: Optical observations with LCO40
  49. GRB 050202: Short burst detected by Swift-BAT
  50. GRB 050128 Optical observation with REM
  51. GRB 050129: a weak long GRB detected with INTEGRAL
  52. GRB050128: Faulkes Telescope South observations
  53. GRB 050124: Radio Observations
  54. GRB 050128: near-infrared observations with REM
  55. GRB050128,optical observations
  56. GRB 050126: A NIR afterglow candidate in the revised XRT error circle
  57. GRB 050126: Radio Observations
  58. GRB050128 Swift-BAT observations
  59. GRB 050128: Swift XRT prompt afterglow position
  60. GRB 050124: K-band afterglow observations
  61. GRB050126: MASTER optical limit for KECK OT
  62. GRB050126: MASTER optical observations
  63. GRB 050126: Detection of NIR afterglow with Keck/NIRC
  64. GRB 050126: Prompt XRT detection and localization
  65. GRB 050124: NIR afterglow confirmed with Keck/NIRC
  66. GRB 050124, SMARTS optical/IR observations
  67. GRB 050117a: Radio Observations
  68. GRB 050124 I-band observation
  69. GRB 050124: NIR Candidates from Keck/NIRC
  70. GRB050124,optical observation
  71. GRB 050124 : Lulin R-band follow-up observation
  72. GRB 050124: Swift XRT Detection of X-ray Afterglow Emission
  73. GRB 050123 : I-band follow-up observation
  74. GRB050123: optical limit 1.8h before GRB
  75. GRB050123,optical observation
  76. GRB 050123: KAIT observations
  77. GRB050123: P60 Observations
  78. GRB 050123(=H3666): A GRB Localized in Real Time by HETE
  79. CFHTLS optical transient unlikely to be a GRB
  80. Unusual optical transient (GRB ???)
  81. GRB050117a: Radio Observations
  82. GRB 041224 and GRB 041226: BOOTES-2 simultaneous observations
  83. GRB 050117, I-band observations
  84. GRB 050117: Optical observation
  85. GRB050117: Refined XRT position
  86. GRB050117: MASTER optical observations
  87. MASTER:GRB050117 SWIFT
  88. GRB050117: Swift-BAT detection of a long multi-peaked burst
  89. Triangulation of Short Hard GRB050112 (large error box)
  90. SGR1806: Optical Transient Candidates in SOHO/LASCO Images
  91. SGR 1806-20 and extragalactic short-duration GRBs
  92. SGR 1806-20: Temporal and Spectral behavior of radio transient
  93. SGR 1806-20, RHESSI observations of the 041227 giant flare
  94. SGR1806: Detection of a Sudden Ionospheric Disturbance
  95. GRB 041217: Optical observations
  96. GRB041219, early time observations
  97. IPN localization of giant flare from SGR1806-20
  98. GRB041219; RXTE ASM Observations
  99. NIR Observations of GRB 041219
  100. GRB041223: decay of the afterglow

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