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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"

25841 results found.

  1. GRB 051016B: Swift detection of a soft burst
  2. GRB051016 XMM-Newton observation
  3. GRB051016: Swift XRT refined analysis.
  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. GRB 051012: Swift-BAT detection of burst yesterday
  8. Swift-BAT Trigger 159578 is a possible burst
  9. GRB 051006: Swift/UVOT Upper Limits
  10. GRB051008: optical candidate
  11. GRB051008: Swift XRT refined analysis
  12. GRB051008: Final refined analysis of the Swift-BAT burst
  13. GRB051008: Radio Observation
  14. GRB 051008: Swift XRT position
  15. GRB 051008, optical observations
  16. GRB 051008: early Swift XRT analysis
  17. GRB 051008: Swift UVOT Candidate
  18. GRB 051006: P60 Observations
  19. GRB 051006: XRT refined analysis
  20. Swift-BAT trigger 158700 is a probable Cosmic Ray Shower Event
  21. GRB 051006: optical observations at Sierra Nevada
  22. GRB051006: Refined analysis of the Swift-BAT burst
  23. GRB051006: Swift detection of a burst
  24. GRB 050906, summary of radio observations
  25. GRB051001: Swift UVOT Upper Limits
  26. GRB 050925: Second Epoch WSRT Radio Observations
  27. GRB 051001: Swift XRT refined analysis
  28. GRB 051001: AAT infra-red observations
  29. GRB 051001: Swift Detection of a Burst
  30. GRB 050820A: NIR photometry at the TNG
  31. GRB050922C: UVES/VLT high resolution spectroscopy
  32. GRB050925: Swift/XRT limits
  33. GRB/SGR 050925: IR Observations
  34. GRB050925: Swift UVOT upper limits
  35. Refined analysis of the Swift-BAT soft short burst
  36. GRB050925: Faulkes Telescope North R-band limit
  37. GRB050925: Swift-BAT detection of a short burst
  38. GRB 050922B: Correction to BAT refined analysis, longer burst
  39. GRB050922B: refined XRT analysis
  40. Konus-Wind observation of GRB 050922C
  41. GRB050922B: Swift UVOT early upper limits.
  42. GRB050922C: Optical Observations
  43. GRB 050922C: Swift XRT refined analysis
  44. HETE Fregate observations of GRB 050922C
  45. GRB 050922C: optical obserations
  46. GRB 050922C: NOT optical observations
  47. GRB 050922C: Swift detection of a bright burst
  48. GRB 050922B: ROTSE-III Optical Limits
  49. GRB 050922B,optical observation
  50. GRB050922B: Swift-BAT detection of a weak long burst
  51. Possible GRB 050922 detected by INTEGRAL
  52. GRB050918: Possible Swift/XRT detected afterglow
  53. GRB050820B: analysis of the XMM-Newton observation
  54. GRB050916: Swift/UVOT Upper Limits
  55. GRB 050916: Swift-BAT refined analysis
  56. Swift-BAT trigger 155764 is not a GRB
  57. Swift-BAT trigger 155764 is probably not a GRB
  58. Swift trigger 155764: bad XRT centroid
  59. Swift-BAT trigger 155535 is definitely not a GRB
  60. GRB 050915B: Swift/UVOT Upper Limits
  61. GRB 050915a: IR Transient
  62. GRB 050915b, SMARTS optical/IR observations
  63. GRB050915B: Swift-BAT detection of a long bright burst
  64. GRB050915: Swift/UVOT upper limits
  65. GRB 050915: IR Observations
  66. GRB 050915: Swift XRT refined analysis
  67. GRB 050915: Swift-BAT refined analysis
  68. GRB 050915: Swift detection of a GRB
  69. GRB050911: Upper limit on X-ray afterglow
  70. Swift-BAT trigger 155072 ground analysis
  71. Swift-BAT trigger 155072 is probably not a GRB
  72. GRB 050911, optical content of Swift/XRT error box
  73. GRB 050911, optical observations
  74. GRB 050911: Swift-BAT refined analysis
  75. GRB 050911: z~0.16 cluster in the field
  76. GRB050911: Swift-BAT detection of a long burst
  77. GRB 050910a: TAROT early optical limits
  78. RBO GRB 050908 observations
  79. WIRO observations in I of GRB 050908
  80. GRB 050906: Possible X-ray Counterpart
  81. GRB050908: Swift/UVOT Early upper limits
  82. GRB050908 : Swift-XRT refined analysis
  83. GRB 050908: Swift-BAT refined analysis
  84. GRB 050908: Optical observations
  85. GRB 050908: Swift detection of a burst
  86. GRB 050906: Optical observations at the Very Large Telescope
  87. GRB 050904 BAT refined analysis of complete data set
  88. GRB 050904: Subaru Optical Spectroscopy
  89. GRB 050906: MARGE Optical Limits
  90. GRB 050906: Swift XRT upper limit
  91. GRB 050904: Keck I-band Imaging
  92. GRB050906: P60 Observations
  93. GRB 050904: Did SWIFT/XRT see the prompt GRB emission ?
  94. GRB 050904: More SOAR
  95. GRB 050904: photometric redshift
  96. GRB 050904: Swift/UVOT observations
  97. GRB 050904: NIR object inside the XRT error box
  98. GRB 050904: early Swift XRT analysis results
  99. GRB 050904: BAT refined analysis of partial data set
  100. GRB050904: Optical Observations

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