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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"

28100 results found.

  1. GRB051022: IR observations
  2. GRB051021A: Swift XRT refined analysis
  3. GRB051022: Optical Observations
  4. GRB051021b: Magellan IR Imaging
  5. GRB 051021, SMARTS optical/IR observations
  6. GRB051022: Swift XRT Position
  7. GRB 051021: P200 Ks Observations
  8. GRB 051022 (=H3950): SXC Flight Localization is Valid
  9. GRB051021: Swift/UVOT Upper Limits
  10. GRB 051021B: Refined analysis of the Swift-BAT burst
  11. GRB 051022: SSO40 Optical Observations
  12. GRB051022,optical observation
  13. GRB 051021,optical observation
  14. GRB 051021B: Swift detection of a burst
  15. GRB 051021 : optical afterglow observation at Lulin
  16. GRB 051021: Optical observations and candidate afterglow
  17. GRB051021.63
  18. GRB051021.6: MASTER optical observation
  19. GRB051021: A GRB Localized by HETE
  20. Swift-BAT triggered on a posible CR Shower or possible GRB
  21. GRB 051016b: Optical limit
  22. Afterglow candidate of GRB 051016B observed at Lulin
  23. GRB 051016A: Swift/UVOT upper limits
  24. GRB 051016B: refined analysis of the Swift/XRT data
  25. GRB 051016B: Swift/UVOT detection
  26. GRB 051016B,optical observation
  27. GRB 051016B : Optical follow-up at Lulin
  28. GRB 051016B: Refined analysis of the Swift-BAT burst
  29. GRB 051016B: Swift detection of a soft burst
  30. GRB 051016: Swift-BAT refined analysis
  31. GRB051016 XMM-Newton observation
  32. GRB051016: Swift XRT refined analysis.
  33. GRB 051016: PROMPT Observations
  34. GRB051016: Swift detection of a burst
  35. Photometric calibration of Swift/UVOT and Re-analysis of Swift/UVOT GRB 050922C data
  36. GRB 051012: Swift-BAT detection of burst yesterday
  37. Swift-BAT Trigger 159578 is a possible burst
  38. GRB 051006: Swift/UVOT Upper Limits
  39. GRB051008: optical candidate
  40. GRB 051008 - a low redshift low-luminosity burst?
  41. GRB051011: bright nebulae near error box
  42. GRB051011: MASTER optical observation
  43. GRB051008: Final refined analysis of the Swift-BAT burst
  44. GRB051008: Radio Observation
  45. GRB 051008, optical observations
  46. GRB 051008: early Swift XRT analysis
  47. GRB 051008: Swift UVOT Candidate
  48. GRB 051006: P60 Observations
  49. Swift-BAT trigger 158700 is a probable Cosmic Ray Shower Event
  50. GRB 051006: optical observations at Sierra Nevada
  51. GRB051006: Refined analysis of the Swift-BAT burst
  52. GRB051006: Swift detection of a burst
  53. GRB 050906, summary of radio observations
  54. GRB051001: Swift UVOT Upper Limits
  55. GRB 050925: Second Epoch WSRT Radio Observations
  56. GRB 051001: I-band limit
  57. GRB 051001: AAT infra-red observations
  58. GRB 051001: Swift-BAT refined analysis
  59. GRB 051001: Swift Detection of a Burst
  60. GRB 050820A: NIR photometry at the TNG
  61. GRB050925: Swift/XRT limits
  62. GRB/SGR 050925: IR Observations
  63. GRB 050922C: break in the lightcurve
  64. GRB050925: Swift UVOT upper limits
  65. Refined analysis of the Swift-BAT soft short burst
  66. GRB050925: Faulkes Telescope North R-band limit
  67. GRB050925: Swift-BAT detection of a short burst
  68. GRB050922C: TNG spectroscopic observations
  69. GRB050922B: refined XRT analysis
  70. GRB050922B: Swift UVOT early upper limits.
  71. GRB050922C: Optical Observations
  72. GRB 050922C: Swift XRT refined analysis
  73. HETE Fregate observations of GRB 050922C
  74. GRB 050922C: Swift-BAT refined analysis
  75. GRB 050922B: Swift-BAT refined analysis
  76. GRB 050922C: optical obserations
  77. GRB 050922C: NOT optical observations
  78. GRB 050922C: Swift detection of a bright burst
  79. GRB 050922B: ROTSE-III Optical Limits
  80. GRB 050922B,optical observation
  81. GRB050922B: Swift-BAT detection of a weak long burst
  82. GRB050820B: analysis of the XMM-Newton observation
  83. GRB050916: Swift/UVOT Upper Limits
  84. GRB 050916: Swift-BAT refined analysis
  85. Swift-BAT trigger 155764 is not a GRB
  86. Swift-BAT trigger 155764 is probably not a GRB
  87. Swift trigger 155764: bad XRT centroid
  88. Swift-BAT trigger 155535 is definitely not a GRB
  89. GRB050916 : Swift-XRT refined analysis
  90. GRB 050915B: Swift-BAT refined analysis
  91. GRB 050915B: Swift/UVOT Upper Limits
  92. GRB 050915a: IR Transient
  93. GRB 050915b, SMARTS optical/IR observations
  94. GRB050915B: Swift-BAT detection of a long bright burst
  95. GRB050915: Swift/UVOT upper limits
  96. GRB 050915: IR Observations
  97. GRB 050915: Swift XRT refined analysis
  98. GRB 050915: Swift-BAT refined analysis
  99. GRB 050915: Swift detection of a GRB
  100. GRB050911: Upper limit on X-ray afterglow

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