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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"

36132 results found.

  1. GRB051021 (=H3947): Refined Analysis
  2. GRB 051021 : optical afterglow observation at Lulin
  3. GRB 051021: Optical observations
  4. GRB 051021: ROTSE-III Confirmation of Optical Counterpart
  5. GRB 051021: Optical observations and candidate afterglow
  6. GRB051021.63
  7. GRB051021.6: MASTER optical observation
  8. Swift-BAT trigger 160640 is not a real GRB
  9. GRB051021: A GRB Localized by HETE
  10. Swift-BAT trigger 160619 is not a GRB
  11. Swift-BAT triggered on a posible CR Shower or possible GRB
  12. GRB 050502b: Optical limit
  13. GRB 051016b: Optical limit
  14. Afterglow candidate of GRB 051016B observed at Lulin
  15. GRB 051016b: Gemini Near IR Observations
  16. GRB 051016A: Swift/UVOT upper limits
  17. GRB 051016B: refined analysis of the Swift/XRT data
  18. GRB 051016B: Swift/UVOT detection
  19. GRB 051016B,optical observation
  20. GRB 051016B : Optical follow-up at Lulin
  21. GRB 051016B: Refined analysis of the Swift-BAT burst
  22. GRB 051016B: Swift detection of a soft burst
  23. GRB 051016: Swift-BAT refined analysis
  24. GRB051016: Swift XRT refined analysis.
  25. GRB 051016: LCO optical and near-IR imaging
  26. GRB 051016: PROMPT Observations
  27. GRB051016: Swift detection of a burst
  28. Photometric calibration of Swift/UVOT and Re-analysis of Swift/UVOT GRB 050922C data
  29. GRB051006: optical observations
  30. GRB 051012: Swift-BAT detection of burst yesterday
  31. Swift trigger 159578 is not a burst
  32. GRB 051006: Swift/UVOT Upper Limits
  33. IBAS Alert 2675 : not a GRB
  34. GRB051008: optical candidate
  35. GRB 051008: - a high redshift high-luminosity burst?
  36. GRB 051008 - a low redshift low-luminosity burst?
  37. IBAS Alert 2673: not a real GRB
  38. GRB051011: MASTER optical observation
  39. GRB051008: optical observation
  40. GRB051008: Swift XRT refined analysis
  41. GRB051008 - Swift UVOT upper limits
  42. Konus-Wind observation of GRB 051008
  43. GRB051008: Final refined analysis of the Swift-BAT burst
  44. GRB 051008: R-band upper limit
  45. GRB051008: Radio Observation
  46. GRB 051008: Swift XRT position
  47. GRB 051008, optical observations
  48. GRB 051008: early Swift XRT analysis
  49. GRB 051008: Swift UVOT Candidate
  50. GRB 051006: P60 Observations
  51. grb test
  52. GRB 051006: XRT refined analysis
  53. GRB 051006: optical observations at Sierra Nevada
  54. GRB 051006: XRT position
  55. GRB 050906, summary of radio observations
  56. GRB 050925: Second Epoch WSRT Radio Observations
  57. GRB 051001: Swift XRT refined analysis
  58. GRB 051001, optical observations at Mt. John
  59. GRB 051001: I-band limit
  60. GRB 051001: AAT infra-red observations
  61. GRB 051001: Swift-BAT refined analysis
  62. GRB 051001: Swift Detection of a Burst
  63. GRB 051001: ROTSE-III Optical Limits
  64. GRB050908: optical observations
  65. GRB050922C: optical observation
  66. GRB050922B: optical limit
  67. GRB 050922C: further VLT observations
  68. GRB 050820A: NIR photometry at the TNG
  69. GRB050922C: UVES/VLT high resolution spectroscopy
  70. GRB050925: Swift/XRT limits
  71. GRB/SGR 050925: IR Observations
  72. GRB 050922C: break in the lightcurve
  73. GRB 050925: WSRT Radio Observations
  74. GRB 050925 : I-band observation at Xinglong observatory
  75. GRB050925: Faulkes Telescope North R-band limit
  76. GRB050925: Swift-BAT detection of a short burst
  77. GRB 050922B: Correction to BAT refined analysis, longer burst
  78. GRB050922C: TNG spectroscopic observations
  79. GRB050922B: refined XRT analysis
  80. Konus-Wind observation of GRB 050922C
  81. GRB 050922C: Refined redshift
  82. GRB OT observation
  83. GRB050922C: observation at MonteBoo
  84. INT 2.5m limit for GRB050922B
  85. GRB 050922B: optical limit
  86. GRB050922C: Optical Observations
  87. GRB 050922C: Swift XRT refined analysis
  88. HETE Fregate observations of GRB 050922C
  89. GRB 050922C: Swift-BAT refined analysis
  90. GRB 050922B: Swift-BAT refined analysis
  91. GRB 050922C: Absorption redshift from the Nordic Optical Telescope
  92. GRB 050922C: optical obserations
  93. GRB 050922C: NOT optical observations
  94. GRB 050922A: Analysis of Swift/XRT TOO observation
  95. GRB 050922C: Swift detection of a bright burst
  96. GRB 050922C: ROTSE-IIId Refined Analysis
  97. GRB 050922C: ROTSE-III Detection of Possible Counterpart
  98. GRB 050922B: ROTSE-III Optical Limits
  99. GRB 050922B,optical observation
  100. GRB050922B: Swift-BAT detection of a weak long burst

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