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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"

36216 results found.

  1. GRB 051016: Swift-BAT refined analysis
  2. GRB051016: Swift XRT refined analysis.
  3. GRB 051016: LCO optical and near-IR imaging
  4. GRB 051016: PROMPT Observations
  5. GRB051016: Swift detection of a burst
  6. Photometric calibration of Swift/UVOT and Re-analysis of Swift/UVOT GRB 050922C data
  7. GRB051006: optical observations
  8. GRB 051012: Swift-BAT detection of burst yesterday
  9. Swift trigger 159578 is not a burst
  10. GRB 051006: Swift/UVOT Upper Limits
  11. IBAS Alert 2675 : not a GRB
  12. GRB051008: optical candidate
  13. GRB 051008: - a high redshift high-luminosity burst?
  14. GRB 051008 - a low redshift low-luminosity burst?
  15. IBAS Alert 2673: not a real GRB
  16. GRB051011: MASTER optical observation
  17. GRB051008: optical observation
  18. GRB051008: Swift XRT refined analysis
  19. GRB051008 - Swift UVOT upper limits
  20. Konus-Wind observation of GRB 051008
  21. GRB051008: Final refined analysis of the Swift-BAT burst
  22. GRB 051008: R-band upper limit
  23. GRB051008: Radio Observation
  24. GRB 051008: Swift XRT position
  25. GRB 051008, optical observations
  26. GRB 051008: early Swift XRT analysis
  27. GRB 051008: Swift UVOT Candidate
  28. GRB 051006: P60 Observations
  29. grb test
  30. GRB 051006: XRT refined analysis
  31. GRB 051006: optical observations at Sierra Nevada
  32. GRB 051006: XRT position
  33. GRB 050906, summary of radio observations
  34. GRB 050925: Second Epoch WSRT Radio Observations
  35. GRB 051001: Swift XRT refined analysis
  36. GRB 051001, optical observations at Mt. John
  37. GRB 051001: I-band limit
  38. GRB 051001: AAT infra-red observations
  39. GRB 051001: Swift-BAT refined analysis
  40. GRB 051001: Swift Detection of a Burst
  41. GRB 051001: ROTSE-III Optical Limits
  42. GRB050908: optical observations
  43. GRB050922C: optical observation
  44. GRB050922B: optical limit
  45. GRB 050922C: further VLT observations
  46. GRB 050820A: NIR photometry at the TNG
  47. GRB050922C: UVES/VLT high resolution spectroscopy
  48. GRB050925: Swift/XRT limits
  49. GRB/SGR 050925: IR Observations
  50. GRB 050922C: break in the lightcurve
  51. GRB 050925: WSRT Radio Observations
  52. GRB 050925 : I-band observation at Xinglong observatory
  53. GRB050925: Faulkes Telescope North R-band limit
  54. GRB050925: Swift-BAT detection of a short burst
  55. GRB 050922B: Correction to BAT refined analysis, longer burst
  56. GRB050922C: TNG spectroscopic observations
  57. GRB050922B: refined XRT analysis
  58. Konus-Wind observation of GRB 050922C
  59. GRB 050922C: Refined redshift
  60. GRB OT observation
  61. GRB050922C: observation at MonteBoo
  62. INT 2.5m limit for GRB050922B
  63. GRB 050922B: optical limit
  64. GRB050922C: Optical Observations
  65. GRB 050922C: Swift XRT refined analysis
  66. HETE Fregate observations of GRB 050922C
  67. GRB 050922C: Swift-BAT refined analysis
  68. GRB 050922B: Swift-BAT refined analysis
  69. GRB 050922C: Absorption redshift from the Nordic Optical Telescope
  70. GRB 050922C: optical obserations
  71. GRB 050922C: NOT optical observations
  72. GRB 050922A: Analysis of Swift/XRT TOO observation
  73. GRB 050922C: Swift detection of a bright burst
  74. GRB 050922C: ROTSE-IIId Refined Analysis
  75. GRB 050922C: ROTSE-III Detection of Possible Counterpart
  76. GRB 050922B: ROTSE-III Optical Limits
  77. GRB 050922B,optical observation
  78. GRB050922B: Swift-BAT detection of a weak long burst
  79. Possible GRB 050922 detected by INTEGRAL
  80. GRB050820B: analysis of the XMM-Newton observation
  81. GRB050916: Swift/UVOT Upper Limits
  82. GRB 050916: Swift-BAT refined analysis
  83. GRB 050918 - A long GRB detected by INTEGRAL
  84. GRB 050915a: Radio Observations
  85. Swift-BAT trigger 155764 is not a GRB
  86. Swift-BAT trigger 155764 is probably not a GRB
  87. Swift-BAT trigger 155535 is definitely not a GRB
  88. GRB 050916: XRT position
  89. GRB 050915b, SMARTS optical/IR observations of the XRT position
  90. GRB 050915B: Swift-BAT refined analysis
  91. GRB 050915B: Swift/UVOT Upper Limits
  92. GRB 050915a: IR Transient
  93. GRB 050915B: XRT position
  94. GRB 050915b, SMARTS optical/IR observations
  95. GRB 050915: KAIT optical limit
  96. GRB 050915: IR Observations
  97. GRB 050915: Swift XRT refined analysis
  98. GRB 050915: Swift-BAT refined analysis
  99. GRB050915: P60 Optical Observations
  100. GRB 050915: ROTSE-III optical limits

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