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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"

37256 results found.

  1. GRB 051021: Optical observations and candidate afterglow
  2. GRB051021.63
  3. GRB051021.6: MASTER optical observation
  4. Swift-BAT trigger 160640 is not a real GRB
  5. GRB051021: A GRB Localized by HETE
  6. Swift-BAT trigger 160619 is not a GRB
  7. Swift-BAT triggered on a posible CR Shower or possible GRB
  8. GRB 050502b: Optical limit
  9. GRB 051016b: Optical limit
  10. Afterglow candidate of GRB 051016B observed at Lulin
  11. GRB 051016b: Gemini Near IR Observations
  12. GRB 051016A: Swift/UVOT upper limits
  13. GRB 051016B: refined analysis of the Swift/XRT data
  14. GRB 051016B: Swift/UVOT detection
  15. GRB 051016B,optical observation
  16. GRB 051016B : Optical follow-up at Lulin
  17. GRB 051016B: Refined analysis of the Swift-BAT burst
  18. GRB 051016B: Swift detection of a soft burst
  19. GRB 051016: Swift-BAT refined analysis
  20. GRB051016 XMM-Newton observation
  21. GRB051016: Swift XRT refined analysis.
  22. GRB 051016: LCO optical and near-IR imaging
  23. GRB 051016: PROMPT Observations
  24. GRB051016: Swift detection of a burst
  25. Photometric calibration of Swift/UVOT and Re-analysis of Swift/UVOT GRB 050922C data
  26. GRB051006: optical observations
  27. GRB 051012: Swift-BAT detection of burst yesterday
  28. Swift trigger 159578 is not a burst
  29. Swift-BAT Trigger 159578 is a possible burst
  30. GRB 051006: Swift/UVOT Upper Limits
  31. IBAS Alert 2675 : not a GRB
  32. GRB051008: optical candidate
  33. GRB 051008: - a high redshift high-luminosity burst?
  34. GRB 051008 - a low redshift low-luminosity burst?
  35. IBAS Alert 2673: not a real GRB
  36. GRB051011: MASTER optical observation
  37. GRB051008: optical observation
  38. GRB051008: Swift XRT refined analysis
  39. GRB051008 - Swift UVOT upper limits
  40. Konus-Wind observation of GRB 051008
  41. GRB051008: Final refined analysis of the Swift-BAT burst
  42. GRB 051008: R-band upper limit
  43. GRB051008: Radio Observation
  44. GRB 051008: Swift XRT position
  45. GRB 051008, optical observations
  46. GRB 051008: early Swift XRT analysis
  47. GRB 051008: Swift UVOT Candidate
  48. GRB 051006: P60 Observations
  49. grb test
  50. GRB 051006: XRT refined analysis
  51. Swift-BAT trigger 158700 is a probable Cosmic Ray Shower Event
  52. GRB 051006: optical observations at Sierra Nevada
  53. GRB 051006: XRT position
  54. GRB 050906, summary of radio observations
  55. GRB 050925: Second Epoch WSRT Radio Observations
  56. GRB 051001: Swift XRT refined analysis
  57. GRB 051001, optical observations at Mt. John
  58. GRB 051001: I-band limit
  59. GRB 051001: AAT infra-red observations
  60. GRB 051001: Swift-BAT refined analysis
  61. GRB 051001: Swift Detection of a Burst
  62. GRB 051001: ROTSE-III Optical Limits
  63. GRB050908: optical observations
  64. GRB050922C: optical observation
  65. GRB050922B: optical limit
  66. GRB 050922C: further VLT observations
  67. GRB 050820A: NIR photometry at the TNG
  68. GRB050922C: UVES/VLT high resolution spectroscopy
  69. GRB050925: Swift/XRT limits
  70. GRB/SGR 050925: IR Observations
  71. GRB 050922C: break in the lightcurve
  72. GRB 050925: WSRT Radio Observations
  73. GRB 050925 : I-band observation at Xinglong observatory
  74. GRB050925: Faulkes Telescope North R-band limit
  75. GRB050925: Swift-BAT detection of a short burst
  76. GRB 050922B: Correction to BAT refined analysis, longer burst
  77. GRB050922C: TNG spectroscopic observations
  78. GRB050922B: refined XRT analysis
  79. Konus-Wind observation of GRB 050922C
  80. GRB 050922C: Refined redshift
  81. GRB050922B: Swift UVOT early upper limits.
  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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