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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"

38018 results found.

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

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