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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"

28110 results found.

  1. GRB051028: Swift XRT Position
  2. GRB051028:MASTER observations
  3. GRB051021B: Swift/UVOT Upper limits
  4. GRB 051021, Optical Observations
  5. GRB 051022: XRT Refined Spectral and Temporal Analysis
  6. GRB051012: Swift-XRT analysis
  7. GRB051021B: Swift XRT refined analysis
  8. GRB 051022, mm counterpart
  9. GRB 051022: Swift/UVOT Upper Limits
  10. GRB051022: Radio Counterpart
  11. GRB051022: IR observations
  12. GRB051021A: Swift XRT refined analysis
  13. GRB051022: Optical Observations
  14. GRB051021b: Magellan IR Imaging
  15. GRB 051021, SMARTS optical/IR observations
  16. GRB051022: Swift XRT Position
  17. GRB 051021: P200 Ks Observations
  18. GRB 051022 (=H3950): SXC Flight Localization is Valid
  19. GRB051021: Swift/UVOT Upper Limits
  20. GRB 051021B: Refined analysis of the Swift-BAT burst
  21. GRB 051022: SSO40 Optical Observations
  22. GRB051022,optical observation
  23. GRB 051021,optical observation
  24. GRB 051021B: Swift detection of a burst
  25. GRB 051021 : optical afterglow observation at Lulin
  26. GRB 051021: Optical observations and candidate afterglow
  27. GRB051021.63
  28. GRB051021.6: MASTER optical observation
  29. GRB051021: A GRB Localized by HETE
  30. Swift-BAT triggered on a posible CR Shower or possible GRB
  31. GRB 051016b: Optical limit
  32. Afterglow candidate of GRB 051016B observed at Lulin
  33. GRB 051016A: Swift/UVOT upper limits
  34. GRB 051016B: refined analysis of the Swift/XRT data
  35. GRB 051016B: Swift/UVOT detection
  36. GRB 051016B,optical observation
  37. GRB 051016B : Optical follow-up at Lulin
  38. GRB 051016B: Refined analysis of the Swift-BAT burst
  39. GRB 051016B: Swift detection of a soft burst
  40. GRB 051016: Swift-BAT refined analysis
  41. GRB051016 XMM-Newton observation
  42. GRB051016: Swift XRT refined analysis.
  43. GRB 051016: PROMPT Observations
  44. GRB051016: Swift detection of a burst
  45. Photometric calibration of Swift/UVOT and Re-analysis of Swift/UVOT GRB 050922C data
  46. GRB 051012: Swift-BAT detection of burst yesterday
  47. Swift-BAT Trigger 159578 is a possible burst
  48. GRB 051006: Swift/UVOT Upper Limits
  49. GRB051008: optical candidate
  50. GRB 051008 - a low redshift low-luminosity burst?
  51. GRB051011: bright nebulae near error box
  52. GRB051011: MASTER optical observation
  53. GRB051008: Final refined analysis of the Swift-BAT burst
  54. GRB051008: Radio Observation
  55. GRB 051008, optical observations
  56. GRB 051008: early Swift XRT analysis
  57. GRB 051008: Swift UVOT Candidate
  58. GRB 051006: P60 Observations
  59. Swift-BAT trigger 158700 is a probable Cosmic Ray Shower Event
  60. GRB 051006: optical observations at Sierra Nevada
  61. GRB051006: Refined analysis of the Swift-BAT burst
  62. GRB051006: Swift detection of a burst
  63. GRB 050906, summary of radio observations
  64. GRB051001: Swift UVOT Upper Limits
  65. GRB 050925: Second Epoch WSRT Radio Observations
  66. GRB 051001: I-band limit
  67. GRB 051001: AAT infra-red observations
  68. GRB 051001: Swift-BAT refined analysis
  69. GRB 051001: Swift Detection of a Burst
  70. GRB 050820A: NIR photometry at the TNG
  71. GRB050925: Swift/XRT limits
  72. GRB/SGR 050925: IR Observations
  73. GRB 050922C: break in the lightcurve
  74. GRB050925: Swift UVOT upper limits
  75. Refined analysis of the Swift-BAT soft short burst
  76. GRB050925: Faulkes Telescope North R-band limit
  77. GRB050925: Swift-BAT detection of a short burst
  78. GRB050922C: TNG spectroscopic observations
  79. GRB050922B: refined XRT analysis
  80. GRB050922B: Swift UVOT early upper limits.
  81. GRB050922C: Optical Observations
  82. GRB 050922C: Swift XRT refined analysis
  83. HETE Fregate observations of GRB 050922C
  84. GRB 050922C: Swift-BAT refined analysis
  85. GRB 050922B: Swift-BAT refined analysis
  86. GRB 050922C: optical obserations
  87. GRB 050922C: NOT optical observations
  88. GRB 050922C: Swift detection of a bright burst
  89. GRB 050922B: ROTSE-III Optical Limits
  90. GRB 050922B,optical observation
  91. GRB050922B: Swift-BAT detection of a weak long burst
  92. GRB050820B: analysis of the XMM-Newton observation
  93. GRB050916: Swift/UVOT Upper Limits
  94. GRB 050916: Swift-BAT refined analysis
  95. Swift-BAT trigger 155764 is not a GRB
  96. Swift-BAT trigger 155764 is probably not a GRB
  97. Swift trigger 155764: bad XRT centroid
  98. Swift-BAT trigger 155535 is definitely not a GRB
  99. GRB050916 : Swift-XRT refined analysis
  100. GRB 050915B: Swift-BAT refined analysis

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