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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"

37185 results found.

  1. GRB 050128: Radio observations
  2. Further analysis of the short Swift-BAT GRB 050202
  3. GRB 050202: Second epoch radio observations
  4. GRB 050129: Optical observations
  5. GRB050202: Radio Observations
  6. GRB 050202: Optical observations with LCO40
  7. GRB 050202: Short burst detected by Swift-BAT
  8. GRB 050128 Optical observation with REM
  9. GRB 050129: a weak long GRB detected with INTEGRAL
  10. GRB050128: Faulkes Telescope South observations
  11. GRB 050124: Radio Observations
  12. GRB 050128: near-infrared observations with REM
  13. GRB050128,optical observations
  14. GRB 050126: A NIR afterglow candidate in the revised XRT error circle
  15. GRB 050126: Radio Observations
  16. GRB050128 Swift-BAT observations
  17. GRB 050128: Swift XRT prompt afterglow position
  18. GRB 050124: K-band afterglow observations
  19. GRB050126: MASTER optical limit for KECK OT
  20. GRB050126: MASTER optical observations
  21. GRB 050126: Detection of NIR afterglow with Keck/NIRC
  22. GRB 050126: Prompt XRT detection and localization
  23. GRB 050124: NIR afterglow confirmed with Keck/NIRC
  24. GRB 050124, SMARTS optical/IR observations
  25. GRB 050117a: Radio Observations
  26. GRB 050124 I-band observation
  27. GRB 050124: NIR Candidates from Keck/NIRC
  28. GRB050124,optical observation
  29. GRB 050124 : Lulin R-band follow-up observation
  30. GRB050124: Updated Swift XRT Position and Fluxes
  31. GRB 050124: Swift XRT Detection of X-ray Afterglow Emission
  32. GRB050124: Refined BAT position, spectral and fluence information
  33. GRB 050123 : I-band follow-up observation
  34. GRB050123: optical limit 1.8h before GRB
  35. GRB050123,optical observation
  36. GRB 050123: KAIT observations
  37. GRB050123: P60 Observations
  38. GRB 050123(=H3666): A GRB Localized in Real Time by HETE
  39. CFHTLS optical transient unlikely to be a GRB
  40. Unusual optical transient (GRB ???)
  41. GRB050117a: Radio Observations
  42. GRB 041224 and GRB 041226: BOOTES-2 simultaneous observations
  43. GRB 050117, I-band observations
  44. GRB 050117: Optical observation
  45. GRB050117: Refined XRT position
  46. GRB050117: MASTER optical observations
  47. MASTER:GRB050117 SWIFT
  48. GRB050117: Swift-BAT detection of a long multi-peaked burst
  49. SGR 1806-20: RXTE/PCA pulse frequency during flare
  50. Triangulation of Short Hard GRB050112 (large error box)
  51. SGR1806: Optical Transient Candidates in SOHO/LASCO Images
  52. Further VLA observations of SGR 1806-20
  53. SGR 1806-20 and extragalactic short-duration GRBs
  54. Further ATCA observations of SGR 1806-20
  55. SGR 1806-20: Temporal and Spectral behavior of radio transient
  56. SGR 1806-20, RHESSI observations of the 041227 giant flare
  57. SGR1806: Detection of a Sudden Ionospheric Disturbance
  58. SGR1806 VLA Observations
  59. GRB 041217: Optical observations
  60. GRB041219, early time observations
  61. IPN localization of giant flare from SGR1806-20
  62. Giant flare from SGR 1806-20 detected by INTEGRAL
  63. GRB041228: ROTSE-III Optical Observations
  64. GRB041219; RXTE ASM Observations
  65. NIR Observations of GRB 041219
  66. GRB041226: ROTSE-III Optical Observations
  67. GRB041223: decay of the afterglow
  68. GRB041224: ROTSE-III Optical Observations
  69. GRB 041224: near-infrared observations with REM
  70. GRB 041223: XRT afterglow spectrum and light curve
  71. GRB 041223 Fluence measured by Swift-BAT
  72. GRB041223: optical and NIR observations with REM
  73. Swift-BAT Time History of GRB041219
  74. GRB 041219: TAROT optical observations
  75. GRB 041218: TAROT optical observations
  76. GRB 041223: J-band observations of the afterglow
  77. GRB 041223: Detection of Optical Transient with LCO40
  78. GRB041223: Swift XRT Detection of X-ray Afterglow Emission
  79. GRB 041219c: PROMPT Observations
  80. GRB041223: ROTSE-III Optical Observations
  81. GRB 041218: optical observations
  82. GRB 041219: Second Epoch WSRT Radio Observations
  83. GRB 041219: WSRT Radio Afterglow Detection
  84. GRB 041219: Keck IR Observations and Astrometric Refinement of the
  85. GRB 041218: Optical observations
  86. GRB 041219 : optical follow-up observations
  87. Deep RAPTOR observations during GRB 041219
  88. GRB 041218 Optical Observations
  89. GRB 041219 Optical Observations
  90. GRB041219c: Third Burst in One Day from Swift-BAT
  91. GRB041219: Optical Afterglow Detection
  92. GRB041219: Continued NIR Observations
  93. GRB 041219 ,optical observation
  94. GRB 041219: Radio Afterglow Detection
  95. GRB 041218 : Radio Observations
  96. GRB 041218: R-band optical observations
  97. GRB041219: Confirmed NIR Afterglow
  98. GRB041218: Continued P60 Optical Observations
  99. GRB 041218: Optical Observation
  100. GRB 041219: Infrared Afterglow Candidate

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