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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"

32760 results found.

  1. GRB 051022: RTT150 optical observations
  2. GRB 051021A: RTT150 optical observations
  3. GRB051028 SARA Observation
  4. GRB051028: optical observations
  5. GRB051028: Swift/UVOT upper limits
  6. GRB051028: WHT optical candidate
  7. GRB051028: Swift XRT Position
  8. GRB051028:MASTER observations
  9. GRB 051022: XRT Refined Spectral and Temporal Analysis--Correction
  10. GRB051022: Swift XRT measurement of jet break
  11. GRB051021B: Swift/UVOT Upper limits
  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. GRB051021B: Swift XRT refined analysis
  17. GRB051021a: optical observations
  18. GRB 051022: WSRT Radio Detection
  19. GRB 051022, mm counterpart
  20. GRB051022: host galaxy redshift
  21. GRB 051022: Swift/UVOT Upper Limits
  22. GRB051022: Radio Counterpart
  23. GRB051022: IR observations
  24. GRB 051022: SOAR JKs Observations
  25. GRB051021A: Swift XRT refined analysis
  26. Konus-Wind observation of GRB 051022
  27. GRB051022: Optical Observations
  28. GRB 051022: Magellan NIR imaging
  29. GRB 051021: PROMPT RcIc Observations
  30. GRB051021b: Magellan IR Imaging
  31. GRB 051021: Correction
  32. GRB 051022, J & K-band observation
  33. GRB 051021, SMARTS optical/IR observations
  34. GRB051022: Swift XRT Position
  35. GRB 051021: P200 Ks Observations
  36. IPN triangulation of GRB051022 (=H3950)
  37. GRB 051021: MDM Upper Limit
  38. GRB 051022 (=H3950): SXC Flight Localization is Valid
  39. GRB051021: Swift/UVOT Upper Limits
  40. GRB 051021B: Refined analysis of the Swift-BAT burst
  41. GRB 051022: SSO40 Optical Observations
  42. GRB 051022A: ROTSE-III Optical Limits
  43. GRB051022 (=H3590), A GRB Detected By HETE
  44. GRB 051022: Optical observations
  45. GRB051021B: Swift XRT Position
  46. GRB 051021: SOAR NIR Observations
  47. GRB051021: Swift XRT analysis
  48. GRB 051021 : optical afterglow observation at Lulin
  49. GRB 051021: Optical observations
  50. GRB 051021: ROTSE-III Confirmation of Optical Counterpart
  51. GRB 051021: Optical observations and candidate afterglow
  52. GRB051021: A GRB Localized by HETE
  53. GRB 050502b: Optical limit
  54. GRB 051016b: Optical limit
  55. Afterglow candidate of GRB 051016B observed at Lulin
  56. GRB 051016b: Gemini Near IR Observations
  57. GRB 051016A: Swift/UVOT upper limits
  58. GRB 051016B: refined analysis of the Swift/XRT data
  59. GRB 051016B: Swift/UVOT detection
  60. GRB 051016B : Optical follow-up at Lulin
  61. GRB 051016B: Refined analysis of the Swift-BAT burst
  62. GRB 051016: Swift-BAT refined analysis
  63. GRB051016: Planned XMM-Newton observation
  64. GRB 051016: LCO optical and near-IR imaging
  65. GRB 051016: PROMPT Observations
  66. Photometric calibration of Swift/UVOT and Re-analysis of Swift/UVOT GRB 050922C data
  67. GRB051006: optical observations
  68. Swift trigger 159578 is not a burst
  69. GRB050805A: Rc optical observations
  70. GRB 051006: Swift/UVOT Upper Limits
  71. GRB051008: optical candidate
  72. GRB 051008 - a low redshift low-luminosity burst?
  73. GRB051008: Swift XRT refined analysis
  74. GRB051008 - Swift UVOT upper limits
  75. Konus-Wind observation of GRB 051008
  76. GRB051008: Final refined analysis of the Swift-BAT burst
  77. GRB 051008: R-band upper limit
  78. GRB051008: Refined analysis of the Swift-BAT burst
  79. GRB051008: Radio Observation
  80. GRB 051008: Swift XRT position
  81. GRB 051008, optical observations
  82. GRB 051006: P60 Observations
  83. GRB 051006: XRT refined analysis
  84. GRB051006: Refined analysis of the Swift-BAT burst
  85. GRB 051006: XRT position
  86. GRB 050906, summary of radio observations
  87. Swift-BAT triggers 158261 and 158262 Retraction
  88. GRB051001: Swift UVOT Upper Limits
  89. GRB 050925: Second Epoch WSRT Radio Observations
  90. GRB 051001: Swift XRT refined analysis
  91. GRB 051001, optical observations at Mt. John
  92. GRB 051001: I-band limit
  93. GRB 051001: AAT infra-red observations
  94. GRB 051001: Swift-BAT refined analysis
  95. GRB 051001: ROTSE-III Optical Limits
  96. GRB050908: optical observations
  97. GRB050922B: optical limit
  98. GRB 050922C: further VLT observations
  99. GRB 050820A: NIR photometry at the TNG
  100. GRB050922C: UVES/VLT high resolution spectroscopy

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