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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"

21946 results found.

  1. GRB051028:MASTER correction and final results
  2. GRB 051022: RTT150 optical observations
  3. GRB 051021A: RTT150 optical observations
  4. GRB051028 SARA Observation
  5. GRB051028: optical observations
  6. GRB051028: WHT optical candidate
  7. GRB051028:MASTER observations
  8. GRB051028:MASTER optical observations
  9. GRB 051022: XRT Refined Spectral and Temporal Analysis--Correction
  10. GRB051022: Swift XRT measurement of jet break
  11. GRB 051021, Optical Observations
  12. GRB 051022: XRT Refined Spectral and Temporal Analysis
  13. GRB 051022, refined optical astrometry
  14. Chandra Observations of GRB 051022
  15. GRB051012: Swift-XRT analysis
  16. GRB 051022 Chandra Observations scheduled
  17. GRB051021B: Swift XRT refined analysis
  18. GRB051021a: optical observations
  19. GRB 051022: WSRT Radio Detection
  20. GRB 051022, mm counterpart
  21. GRB051022: host galaxy redshift
  22. GRB051022: Radio Counterpart
  23. GRB051022: IR observations
  24. GRB 051022: SOAR JKs Observations
  25. GRB051022: Optical Observations
  26. GRB 051021: PROMPT RcIc Observations
  27. GRB 051022, J & K-band observation
  28. GRB 051021, SMARTS optical/IR observations
  29. GRB 051021: P200 Ks Observations
  30. GRB 051022: SSO40 Optical Observations
  31. GRB051022 (=H3590), A GRB Detected By HETE
  32. GRB 051022: Optical observations
  33. GRB 051021: SOAR NIR Observations
  34. GRB051021: Swift XRT analysis
  35. GRB 051021 : optical afterglow observation at Lulin
  36. GRB 051021: Optical observations
  37. GRB 051021: ROTSE-III Confirmation of Optical Counterpart
  38. GRB 051021: Optical observations and candidate afterglow
  39. GRB 051016b: Gemini Near IR Observations
  40. GRB 051016: PROMPT Observations
  41. Photometric calibration of Swift/UVOT and Re-analysis of Swift/UVOT GRB 050922C data
  42. GRB051006: optical observations
  43. GRB050805A: Rc optical observations
  44. GRB051008: optical candidate
  45. GRB051008: optical observation
  46. GRB051008: Swift XRT refined analysis
  47. GRB 051008, optical observations
  48. GRB 051006: P60 Observations
  49. GRB 051006: optical observations at Sierra Nevada
  50. GRB 050906, summary of radio observations
  51. GRB 050925: Second Epoch WSRT Radio Observations
  52. GRB 051001: Swift XRT refined analysis
  53. GRB 051001, optical observations at Mt. John
  54. GRB 051001: AAT infra-red observations
  55. GRB 051001: ROTSE-III Optical Limits
  56. GRB050908: optical observations
  57. GRB 050922C: further VLT observations
  58. GRB050922C: UVES/VLT high resolution spectroscopy
  59. GRB/SGR 050925: IR Observations
  60. GRB 050922C: break in the lightcurve
  61. GRB 050925: WSRT Radio Observations
  62. GRB050925: Swift UVOT upper limits
  63. GRB 050925 : I-band observation at Xinglong observatory
  64. GRB050922C: TNG spectroscopic observations
  65. GRB050922C: Optical Observations
  66. GRB 050922C: Swift XRT refined analysis
  67. HETE Fregate observations of GRB 050922C
  68. GRB050922C: optical observations
  69. GRB 050922C: NOT optical observations
  70. GRB 050922C: ROTSE-IIId Refined Analysis
  71. GRB 050922C: ROTSE-III Detection of Possible Counterpart
  72. GRB050918: Possible Swift/XRT detected afterglow
  73. GRB 050915a: Radio Observations
  74. Swift-BAT trigger 155764 is not a GRB
  75. GRB 050915b, SMARTS optical/IR observations of the XRT position
  76. GRB 050915b, SMARTS optical/IR observations
  77. GRB 050915: IR Observations
  78. GRB050915: P60 Optical Observations
  79. GRB050915, optical observations
  80. Swift-BAT trigger 155072 ground analysis
  81. GRB 050911: LCO limits on a variable source
  82. GRB050911: Swift UVOT followup observations
  83. GRB 050911, optical content of Swift/XRT error box
  84. GRB 050911: LCO observations
  85. GRB 050911, optical observations
  86. GRB 050911: z~0.16 cluster in the field
  87. GRB 050910a: TAROT early optical limits
  88. RBO GRB 050908 observations
  89. WIRO observations in I of GRB 050908
  90. GRB 050906: Possible X-ray Counterpart
  91. GRB 050906: RTT150 optical observations
  92. GRB050908: VLT R-band decay index.
  93. GRB 050908: Optical observations
  94. Gemini Spectroscopy of GRB 050908
  95. GRB 050908: Prompt PROMPT Observations
  96. GRB 050908: KAIT observations
  97. GRB 050908: P60 Confirmation of Optical Afterglow
  98. GRB 050908: Optical Observations
  99. GRB 050908: Swift detection of a burst
  100. Swift trigger 154073 is not a GRB

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