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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"

36116 results found.

  1. GRB 050219b: CORRECTION: Swift XRT Position
  2. GRB 050219b: Swift XRT Position
  3. GRB 050219a, optical observations
  4. GRB 050219a: Refined XRT position
  5. GRB 050219: Swift-BAT detection of a burst
  6. GRB050215b: Swift UVOT Detection of Afterglow Emission
  7. GRB 050219: Prompt X-ray position
  8. GRB 050215B: Radio Observations
  9. GRB 050215b: XRT confirmation of IR afterglow candidate
  10. GRB050215b: P60 Optical Observations
  11. GRB 050215b: Swift XRT Source Variability
  12. GRB 050215B: candidate afterglow
  13. GRB 050215b : Lulin follow-up observation
  14. GRB 050215b, BOOTES-2 simultaneous optical observations
  15. GRB 050215B: UKIRT K-band imaging
  16. GRB 050215b: Swift XRT Observations
  17. GRB 050215b, BOOTES-1B optical limit
  18. GRB050215A: ROTSE-III Optical Observations
  19. GRB050209: TAROT optical observations
  20. GRB 050209(=U11568): Duration and spectrum
  21. short/hard GRB 050202, optical observations
  22. GRB050209: REM optical observations
  23. GRB 050209 I-band observation
  24. GRB 050209 Optical observations
  25. GRB050209: P60 Optical Observations
  26. GRB050209 (=U11568): A Long GRB Detected by HETE
  27. GRB 050209: Optical observation
  28. GRB 050128: Radio observations
  29. Further analysis of the short Swift-BAT GRB 050202
  30. GRB 050202: Second epoch radio observations
  31. GRB 050129: Optical observations
  32. GRB050202: Radio Observations
  33. GRB 050202: Optical observations with LCO40
  34. GRB 050202: Short burst detected by Swift-BAT
  35. GRB 050128 Optical observation with REM
  36. GRB 050129: a weak long GRB detected with INTEGRAL
  37. GRB050128: Faulkes Telescope South observations
  38. GRB 050124: Radio Observations
  39. GRB 050128: near-infrared observations with REM
  40. GRB050128,optical observations
  41. GRB 050126: A NIR afterglow candidate in the revised XRT error circle
  42. GRB 050126: Radio Observations
  43. GRB050128 Swift-BAT observations
  44. GRB 050128: Swift XRT prompt afterglow position
  45. GRB 050124: K-band afterglow observations
  46. GRB050126: MASTER optical limit for KECK OT
  47. GRB050126: MASTER optical observations
  48. GRB 050126: Detection of NIR afterglow with Keck/NIRC
  49. GRB 050126: Prompt XRT detection and localization
  50. GRB 050124: NIR afterglow confirmed with Keck/NIRC
  51. GRB 050124, SMARTS optical/IR observations
  52. GRB 050117a: Radio Observations
  53. GRB 050124 I-band observation
  54. GRB 050124: NIR Candidates from Keck/NIRC
  55. GRB050124,optical observation
  56. GRB 050124 : Lulin R-band follow-up observation
  57. GRB 050124: Swift XRT Detection of X-ray Afterglow Emission
  58. GRB 050123 : I-band follow-up observation
  59. GRB050123: optical limit 1.8h before GRB
  60. GRB050123,optical observation
  61. GRB 050123: KAIT observations
  62. GRB050123: P60 Observations
  63. GRB 050123(=H3666): A GRB Localized in Real Time by HETE
  64. CFHTLS optical transient unlikely to be a GRB
  65. Unusual optical transient (GRB ???)
  66. GRB050117a: Radio Observations
  67. GRB 041224 and GRB 041226: BOOTES-2 simultaneous observations
  68. GRB 050117, I-band observations
  69. GRB 050117: Optical observation
  70. GRB050117: Refined XRT position
  71. GRB050117: MASTER optical observations
  72. MASTER:GRB050117 SWIFT
  73. GRB050117: Swift-BAT detection of a long multi-peaked burst
  74. Triangulation of Short Hard GRB050112 (large error box)
  75. SGR1806: Optical Transient Candidates in SOHO/LASCO Images
  76. SGR 1806-20 and extragalactic short-duration GRBs
  77. SGR 1806-20: Temporal and Spectral behavior of radio transient
  78. SGR 1806-20, RHESSI observations of the 041227 giant flare
  79. SGR1806: Detection of a Sudden Ionospheric Disturbance
  80. GRB 041217: Optical observations
  81. GRB041219, early time observations
  82. IPN localization of giant flare from SGR1806-20
  83. GRB041219; RXTE ASM Observations
  84. NIR Observations of GRB 041219
  85. GRB041223: decay of the afterglow
  86. GRB 041224: near-infrared observations with REM
  87. GRB 041223: XRT afterglow spectrum and light curve
  88. GRB 041223 Fluence measured by Swift-BAT
  89. GRB041223: optical and NIR observations with REM
  90. GRB 041219: TAROT optical observations
  91. GRB 041218: TAROT optical observations
  92. GRB 041223: J-band observations of the afterglow
  93. GRB 041223: Detection of Optical Transient with LCO40
  94. GRB 041219c: PROMPT Observations
  95. GRB 041218: optical observations
  96. GRB 041219: Second Epoch WSRT Radio Observations
  97. GRB 041219: WSRT Radio Afterglow Detection
  98. GRB 041219: Keck IR Observations and Astrometric Refinement of the
  99. GRB 041218: Optical observations
  100. GRB 041219 : optical follow-up observations

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