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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"

45696 results found.

  1. GRB 050219b: Swift-BAT detection of a burst
  2. GRB 050219b: CORRECTION: Swift XRT Position
  3. GRB 050219b: Swift XRT Position
  4. GRB 050219a, optical observations
  5. GRB 050219a: Refined XRT position
  6. GRB050219a: No Swift UVOT Detection of Afterglow Emission
  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. GRB050215b: No Swift UVOT Detection of Afterglow Emission
  20. GRB050215a: No Swift UVOT Detection of Afterglow Emission
  21. Swift-BAT detects two bursts: GRB050215a and GRB050215b
  22. GRB 050215b, BOOTES-1B optical limit
  23. GRB050215B: ROTSE-III optical observations
  24. GRB050215A: ROTSE-III Optical Observations
  25. GRB050209: TAROT optical observations
  26. GRB 050209(=U11568): Duration and spectrum
  27. short/hard GRB 050202, optical observations
  28. GRB050209: REM optical observations
  29. GRB 050209 I-band observation
  30. GRB 050209 Optical observations
  31. GRB050209: P60 Optical Observations
  32. GRB050209 (=U11568): A Long GRB Detected by HETE
  33. GRB 050209: Optical observation
  34. GRB 050128: Radio observations
  35. Further analysis of the short Swift-BAT GRB 050202
  36. GRB 050202: Second epoch radio observations
  37. GRB 050129: Optical observations
  38. GRB050202: Radio Observations
  39. GRB 050202: Optical observations with LCO40
  40. GRB 050202: Short burst detected by Swift-BAT
  41. GRB 050128 Optical observation with REM
  42. GRB 050129: a weak long GRB detected with INTEGRAL
  43. SGR1806-20: Swift-BAT detection of a large normal burst
  44. GRB050128: Faulkes Telescope South observations
  45. GRB 050124: Radio Observations
  46. GRB 050128: near-infrared observations with REM
  47. GRB050128,optical observations
  48. GRB 050126: A NIR afterglow candidate in the revised XRT error circle
  49. GRB050126: Updated Swift XRT Position
  50. SGR 1806-20: GMRT results at 240 MHz band.
  51. SGR 1806-20: low frequency GMRT results of 2005 Jan 16.
  52. GRB 050126: Radio Observations
  53. GRB050128 Swift-BAT observations
  54. GRB 050128: Swift XRT prompt afterglow position
  55. HETE #3667: P60 Observations
  56. GRB 050124: K-band afterglow observations
  57. GRB050126: MASTER optical limit for KECK OT
  58. GRB050126: Burst Parameters Measured by BAT
  59. GRB050126: MASTER optical observations
  60. GRB 050126: Detection of NIR afterglow with Keck/NIRC
  61. GRB 050126: Prompt XRT detection and localization
  62. GRB 050124: NIR afterglow confirmed with Keck/NIRC
  63. GRB050124: No Swift UVOT Detection of Afterglow Emission
  64. GRB 050124, SMARTS optical/IR observations
  65. GRB 050117a: Radio Observations
  66. GRB 050124 I-band observation
  67. GRB 050124: NIR Candidates from Keck/NIRC
  68. GRB050124,optical observation
  69. GRB 050124 : Lulin R-band follow-up observation
  70. GRB050124: Updated Swift XRT Position and Fluxes
  71. GRB 050124: Swift XRT Detection of X-ray Afterglow Emission
  72. GRB050124: Refined BAT position, spectral and fluence information
  73. GRB050124: Swift-BAT position of a double-peaked burst
  74. GRB 050123 : I-band follow-up observation
  75. GRB050123: optical limit 1.8h before GRB
  76. GRB050123,optical observation
  77. GRB 050123: KAIT observations
  78. GRB050123: P60 Observations
  79. GRB 050123(=H3666): A GRB Localized in Real Time by HETE
  80. CFHTLS optical transient unlikely to be a GRB
  81. Unusual optical transient (GRB ???)
  82. GRB050117a: Radio Observations
  83. GRB050117a: Refined analysis
  84. GRB 041224 and GRB 041226: BOOTES-2 simultaneous observations
  85. GRB050117: Palomar WIRC Ks-band observations
  86. GRB050117b: Swift-BAT detection of a weak burst
  87. GRB050117: optical observation
  88. GRB 050117, I-band observations
  89. GRB 050117: Optical observation
  90. GRB050117: Refined XRT position
  91. GRB050117: MASTER optical observations
  92. MASTER:GRB050117 SWIFT
  93. GRB050117: Swift-BAT detection of a long multi-peaked burst
  94. GRB050117: Swift XRT Position
  95. SGR 1806-20: RXTE/PCA pulse frequency during flare
  96. Triangulation of Short Hard GRB050112 (large error box)
  97. SGR 1806-20: Further low frequency GMRT results
  98. SGR1806-20: Swift-BAT observations of two additional bursts
  99. SGR1806: Optical Transient Candidates in SOHO/LASCO Images
  100. Further VLA observations of SGR 1806-20

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