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GCN Circulars

GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. 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"

28097 results found.

  1. GRB051021b: Magellan IR Imaging
  2. GRB 051021, SMARTS optical/IR observations
  3. GRB051022: Swift XRT Position
  4. GRB 051021: P200 Ks Observations
  5. GRB 051022 (=H3950): SXC Flight Localization is Valid
  6. GRB051021: Swift/UVOT Upper Limits
  7. GRB 051021B: Refined analysis of the Swift-BAT burst
  8. GRB 051022: SSO40 Optical Observations
  9. GRB051022,optical observation
  10. GRB 051021,optical observation
  11. GRB 051021B: Swift detection of a burst
  12. GRB 051021 : optical afterglow observation at Lulin
  13. GRB 051021: Optical observations and candidate afterglow
  14. GRB051021.63
  15. GRB051021.6: MASTER optical observation
  16. GRB051021: A GRB Localized by HETE
  17. Swift-BAT triggered on a posible CR Shower or possible GRB
  18. GRB 051016b: Optical limit
  19. Afterglow candidate of GRB 051016B observed at Lulin
  20. GRB 051016A: Swift/UVOT upper limits
  21. GRB 051016B: refined analysis of the Swift/XRT data
  22. GRB 051016B: Swift/UVOT detection
  23. GRB 051016B,optical observation
  24. GRB 051016B : Optical follow-up at Lulin
  25. GRB 051016B: Refined analysis of the Swift-BAT burst
  26. GRB 051016B: Swift detection of a soft burst
  27. GRB 051016: Swift-BAT refined analysis
  28. GRB051016 XMM-Newton observation
  29. GRB051016: Swift XRT refined analysis.
  30. GRB 051016: PROMPT Observations
  31. GRB051016: Swift detection of a burst
  32. Photometric calibration of Swift/UVOT and Re-analysis of Swift/UVOT GRB 050922C data
  33. GRB 051012: Swift-BAT detection of burst yesterday
  34. Swift-BAT Trigger 159578 is a possible burst
  35. GRB 051006: Swift/UVOT Upper Limits
  36. GRB051008: optical candidate
  37. GRB 051008 - a low redshift low-luminosity burst?
  38. GRB051011: bright nebulae near error box
  39. GRB051011: MASTER optical observation
  40. GRB051008: Final refined analysis of the Swift-BAT burst
  41. GRB051008: Radio Observation
  42. GRB 051008, optical observations
  43. GRB 051008: early Swift XRT analysis
  44. GRB 051008: Swift UVOT Candidate
  45. GRB 051006: P60 Observations
  46. Swift-BAT trigger 158700 is a probable Cosmic Ray Shower Event
  47. GRB 051006: optical observations at Sierra Nevada
  48. GRB051006: Refined analysis of the Swift-BAT burst
  49. GRB051006: Swift detection of a burst
  50. GRB 050906, summary of radio observations
  51. GRB051001: Swift UVOT Upper Limits
  52. GRB 050925: Second Epoch WSRT Radio Observations
  53. GRB 051001: I-band limit
  54. GRB 051001: AAT infra-red observations
  55. GRB 051001: Swift-BAT refined analysis
  56. GRB 051001: Swift Detection of a Burst
  57. GRB 050820A: NIR photometry at the TNG
  58. GRB050925: Swift/XRT limits
  59. GRB/SGR 050925: IR Observations
  60. GRB 050922C: break in the lightcurve
  61. GRB050925: Swift UVOT upper limits
  62. Refined analysis of the Swift-BAT soft short burst
  63. GRB050925: Faulkes Telescope North R-band limit
  64. GRB050925: Swift-BAT detection of a short burst
  65. GRB050922C: TNG spectroscopic observations
  66. GRB050922B: refined XRT analysis
  67. GRB050922B: Swift UVOT early upper limits.
  68. GRB050922C: Optical Observations
  69. GRB 050922C: Swift XRT refined analysis
  70. HETE Fregate observations of GRB 050922C
  71. GRB 050922C: Swift-BAT refined analysis
  72. GRB 050922B: Swift-BAT refined analysis
  73. GRB 050922C: optical obserations
  74. GRB 050922C: NOT optical observations
  75. GRB 050922C: Swift detection of a bright burst
  76. GRB 050922B: ROTSE-III Optical Limits
  77. GRB 050922B,optical observation
  78. GRB050922B: Swift-BAT detection of a weak long burst
  79. GRB050820B: analysis of the XMM-Newton observation
  80. GRB050916: Swift/UVOT Upper Limits
  81. GRB 050916: Swift-BAT refined analysis
  82. Swift-BAT trigger 155764 is not a GRB
  83. Swift-BAT trigger 155764 is probably not a GRB
  84. Swift trigger 155764: bad XRT centroid
  85. Swift-BAT trigger 155535 is definitely not a GRB
  86. GRB050916 : Swift-XRT refined analysis
  87. GRB 050915B: Swift-BAT refined analysis
  88. GRB 050915B: Swift/UVOT Upper Limits
  89. GRB 050915a: IR Transient
  90. GRB 050915b, SMARTS optical/IR observations
  91. GRB050915B: Swift-BAT detection of a long bright burst
  92. GRB050915: Swift/UVOT upper limits
  93. GRB 050915: IR Observations
  94. GRB 050915: Swift XRT refined analysis
  95. GRB 050915: Swift-BAT refined analysis
  96. GRB 050915: Swift detection of a GRB
  97. GRB050911: Upper limit on X-ray afterglow
  98. Swift-BAT trigger 155072 ground analysis
  99. Swift-BAT trigger 155072 is probably not a GRB
  100. GRB 050908: DEIMOS spectrum and further analysis

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