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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"

36215 results found.

  1. GRB 050215B: Radio Observations
  2. GRB 050215b: XRT confirmation of IR afterglow candidate
  3. GRB050215b: P60 Optical Observations
  4. GRB 050215b: Swift XRT Source Variability
  5. GRB 050215B: candidate afterglow
  6. GRB 050215b : Lulin follow-up observation
  7. GRB 050215b, BOOTES-2 simultaneous optical observations
  8. GRB 050215B: UKIRT K-band imaging
  9. GRB 050215b: Swift XRT Observations
  10. GRB 050215b, BOOTES-1B optical limit
  11. GRB050215A: ROTSE-III Optical Observations
  12. GRB050209: TAROT optical observations
  13. GRB 050209(=U11568): Duration and spectrum
  14. short/hard GRB 050202, optical observations
  15. GRB050209: REM optical observations
  16. GRB 050209 I-band observation
  17. GRB 050209 Optical observations
  18. GRB050209: P60 Optical Observations
  19. GRB050209 (=U11568): A Long GRB Detected by HETE
  20. GRB 050209: Optical observation
  21. GRB 050128: Radio observations
  22. Further analysis of the short Swift-BAT GRB 050202
  23. GRB 050202: Second epoch radio observations
  24. GRB 050129: Optical observations
  25. GRB050202: Radio Observations
  26. GRB 050202: Optical observations with LCO40
  27. GRB 050202: Short burst detected by Swift-BAT
  28. GRB 050128 Optical observation with REM
  29. GRB 050129: a weak long GRB detected with INTEGRAL
  30. GRB050128: Faulkes Telescope South observations
  31. GRB 050124: Radio Observations
  32. GRB 050128: near-infrared observations with REM
  33. GRB050128,optical observations
  34. GRB 050126: A NIR afterglow candidate in the revised XRT error circle
  35. GRB 050126: Radio Observations
  36. GRB050128 Swift-BAT observations
  37. GRB 050128: Swift XRT prompt afterglow position
  38. GRB 050124: K-band afterglow observations
  39. GRB050126: MASTER optical limit for KECK OT
  40. GRB050126: MASTER optical observations
  41. GRB 050126: Detection of NIR afterglow with Keck/NIRC
  42. GRB 050126: Prompt XRT detection and localization
  43. GRB 050124: NIR afterglow confirmed with Keck/NIRC
  44. GRB 050124, SMARTS optical/IR observations
  45. GRB 050117a: Radio Observations
  46. GRB 050124 I-band observation
  47. GRB 050124: NIR Candidates from Keck/NIRC
  48. GRB050124,optical observation
  49. GRB 050124 : Lulin R-band follow-up observation
  50. GRB 050124: Swift XRT Detection of X-ray Afterglow Emission
  51. GRB 050123 : I-band follow-up observation
  52. GRB050123: optical limit 1.8h before GRB
  53. GRB050123,optical observation
  54. GRB 050123: KAIT observations
  55. GRB050123: P60 Observations
  56. GRB 050123(=H3666): A GRB Localized in Real Time by HETE
  57. CFHTLS optical transient unlikely to be a GRB
  58. Unusual optical transient (GRB ???)
  59. GRB050117a: Radio Observations
  60. GRB 041224 and GRB 041226: BOOTES-2 simultaneous observations
  61. GRB 050117, I-band observations
  62. GRB 050117: Optical observation
  63. GRB050117: Refined XRT position
  64. GRB050117: MASTER optical observations
  65. MASTER:GRB050117 SWIFT
  66. GRB050117: Swift-BAT detection of a long multi-peaked burst
  67. Triangulation of Short Hard GRB050112 (large error box)
  68. SGR1806: Optical Transient Candidates in SOHO/LASCO Images
  69. SGR 1806-20 and extragalactic short-duration GRBs
  70. SGR 1806-20: Low frequency GMRT results; submission to GCN circulars
  71. SGR 1806-20: Temporal and Spectral behavior of radio transient
  72. SGR 1806-20, RHESSI observations of the 041227 giant flare
  73. SGR1806: Detection of a Sudden Ionospheric Disturbance
  74. GRB 041217: Optical observations
  75. GRB041219, early time observations
  76. IPN localization of giant flare from SGR1806-20
  77. GRB041219; RXTE ASM Observations
  78. NIR Observations of GRB 041219
  79. GRB041223: decay of the afterglow
  80. GRB 041224: near-infrared observations with REM
  81. GRB 041223: XRT afterglow spectrum and light curve
  82. GRB 041223 Fluence measured by Swift-BAT
  83. GRB041223: optical and NIR observations with REM
  84. GRB 041219: TAROT optical observations
  85. GRB 041218: TAROT optical observations
  86. GRB 041223: J-band observations of the afterglow
  87. GRB 041223: Detection of Optical Transient with LCO40
  88. GRB 041219c: PROMPT Observations
  89. GRB 041218: optical observations
  90. GRB 041219: Second Epoch WSRT Radio Observations
  91. GRB 041219: WSRT Radio Afterglow Detection
  92. GRB 041219: Keck IR Observations and Astrometric Refinement of the
  93. GRB 041218: Optical observations
  94. GRB 041219 : optical follow-up observations
  95. Deep RAPTOR observations during GRB 041219
  96. GRB 041218 Optical Observations
  97. GRB 041219 Optical Observations
  98. GRB041219c: Third Burst in One Day from Swift-BAT
  99. GRB041219: Optical Afterglow Detection
  100. GRB041219: Continued NIR Observations

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