Skip to main content
End of Swift Science Operations, CHIME Notices Unavailable During Upgrade. See news and announcements

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"

38211 results found.

  1. GRB 050915: ROTSE-III optical limits
  2. GRB 050915: Swift detection of a GRB
  3. GRB050911: Upper limit on X-ray afterglow
  4. Swift-BAT trigger 155072 ground analysis
  5. Swift-BAT trigger 155072 is probably not a GRB
  6. GRB 050911: LCO limits on a variable source
  7. GRB 050908: DEIMOS spectrum and further analysis
  8. Swift is in normal operation
  9. GRB 050911, optical content of Swift/XRT error box
  10. GRB 050911: LCO observations
  11. GRB 050911, optical observations
  12. GRB 050911: Swift-BAT refined analysis
  13. Later Swift-BAT triggers 154632 and 154633 RETRACTION
  14. GRB 050911: z~0.16 cluster in the field
  15. GRB 050910a: TAROT early optical limits
  16. RBO GRB 050908 observations
  17. WIRO observations in I of GRB 050908
  18. GRB 050906: Possible X-ray Counterpart
  19. GRB 050906: RTT150 optical observations
  20. GRB050908: VLT R-band decay index.
  21. GRB 050908: Swift-BAT refined analysis
  22. GRB 050908: Optical observations
  23. Gemini Spectroscopy of GRB 050908
  24. GRB 050908: spectroscopic redshift
  25. GRB 050908: Prompt PROMPT Observations
  26. GRB 050908 : Swift XRT position
  27. GRB 050908: KAIT observations
  28. GRB 050908: P60 Confirmation of Optical Afterglow
  29. GRB 050908: Optical Observations
  30. GRB 050908: Swift detection of a burst
  31. Swift trigger 154073 is not a GRB
  32. GRB 050906: Optical observations at the Very Large Telescope
  33. GRB050904: CrAO optical observations
  34. GRB 050904 BAT refined analysis of complete data set
  35. GRB 050904: Subaru Optical Spectroscopy
  36. GRB 050906: MARGE Optical Limits
  37. GRB 050906: Swift-BAT refined analysis
  38. GRB 050906: Swift XRT upper limit
  39. GRB 050906: Radio Observations
  40. GRB 050904: Keck I-band Imaging
  41. GRB 050904: more VLT NIR observations
  42. GRB 050904: BOOTES early R-band observation
  43. GRB 050904: Did SWIFT/XRT see the prompt GRB emission ?
  44. GRB 050906: Bright galaxy in BAT error box
  45. GRB 050906: Swift/BAT Detection of a possible burst
  46. GRB 050904: More SOAR
  47. GRB 050904: photometric redshift
  48. GRB 050904: Swift/UVOT observations
  49. GRB 050904: Afterglow Astrometry
  50. GRB 050904: NIR object inside the XRT error box
  51. GRB 050904: early Swift XRT analysis results
  52. GRB 050904: SOAR YJ and PROMPT Ic Observations
  53. GRB 050904: BAT refined analysis of partial data set
  54. GRB 050904: TAROT optical measurements
  55. GRB050904: Optical Observations
  56. GRB 050904: Environmental Constraints
  57. GRB 050904: Possible High-Redshift GRB
  58. GRB 050904: SOAR/PROMPT Observations
  59. GRB 050904: TAROT optical limits
  60. Swift-BAT triggers 153461-153465 are not GRBs
  61. GRB 050824: MDM Observations
  62. GRB 050827: Swift XRT preliminary analysis results
  63. IBAS Alerts 2641 and 2642: not a real GRB
  64. Swift Trigger #152652 is not a GRB
  65. GRB 050827 : OSN 1.5m optical observations
  66. GRB 050827: P200 NIR Observations
  67. GRB 050827: Optical Limit
  68. GRB 050827: XRT possible afterglow detection
  69. GRB 050826 : Lulin R band observation
  70. GRB050824: Maidanak optical limits
  71. GRB050820A: RTT150 optical observations
  72. GRB050827: RTT150 optical observations
  73. GRB 050827: Swift-BAT refined analysis
  74. GRB 050826: Optical Candidate
  75. GRB050824, HETE-2 Observation
  76. GRB 050826: Swift XRT preliminary analysis results
  77. GRB 050826: BAT refined analysis
  78. GRB050824: First 2 hours of power low optical decay?
  79. GRB 050826: Swift XRT position
  80. GRB050826: Swift-BAT detection of a long burst
  81. GRB050824: MASTER final analysis of the OT observations
  82. Possible GRB050825:MASTER optical observations
  83. Swift-BAT trigger 152038 is definitely not a GRB
  84. Swift-BAT trigger 152038 is probably not a GRB
  85. GRB050824: decay of the XRT light curve and updated X-ray spectrum
  86. GRB050824, I-band imaging
  87. GRB050824: Radio Observations
  88. GRB 050824: Spectroscopic redshift from the VLT
  89. GRB 050822: refined XRT analysis
  90. GRB 050824: XRT refined analysis and possible afterglow detection
  91. GRB 050824: BAT refined analysis of a soft weak burst
  92. GRB050824: MASTER:OT decay
  93. GRB050824: MASTER observation OT
  94. GRB050805a: MASTER optical candidat
  95. GRB 050824: ROTSE-III Optical Limits
  96. GRB050824: Swift-BAT detection of a burst
  97. GRB 050824 optical candidate
  98. GRB050820A: RTT150 optical observations
  99. GRB050820a: PROMPT RcIc Observations
  100. GRB050815: Maidanak optical observation

Advanced

Download all Circulars as a .tar.gz archive (updated once a day):
Questions or comments?
Contact GCN directly.
Have you found a bug in GCN?
Open an issue.
Want to contribute code to GCN?
Get involved on GitHub.

gcn.nasa.gov

A service of the Astrophysics Science Division at NASA Goddard Space Flight Center

Looking for U.S. government information and services? Visit USA.gov