Skip to main content
New! BOOM Notices and Schema v7.0.0. See news and announcements

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"
  1. GRB 060526: TNG optical observations
  2. GRB 060526: ROTSE-III Observations of Optical Counterpart
  3. GRB 060526: Watcher Observations
  4. GRB060526 - SDSS Pre-burst Observations
  5. GRB 060526: Continued emission for the Swift burst
  6. GRB 060526: Swift detection of a burst with x-ray and optical afterglow
  7. GRB060505: VLT observations of the optical afterglow
  8. GRB 060413 : WIDGET simultaneous optical observations
  9. GRB 060522: Swift/UVOT Observations: Correction
  10. GRB 060522: Swift/UVOT Observations of the Optical Afterglow
  11. XMM-Newton observation of GRB060510b
  12. GRB060512: Late-Time P200 Observations
  13. GRB060522: z = 5.11 Keck-LRIS Redshift
  14. GRB 060522: Swift/XRT Team refined analysis
  15. GRB 060522: Swift-BAT Refined Analysis
  16. GRB 060522: REM NIR observations
  17. GRB 060522: TNG optical observations
  18. GRB 060522: Swift detection of a burst with possible optical afterglow
  19. GRB 060512: reanalysis of optical spectra
  20. GRB 060515: NIR observation
  21. GRB 060210: Jet Break in the XRT light curve
  22. GRB 060516: Refined analysis of the Swift-BAT burst
  23. GRB 060512: TNG optical spectroscopy
  24. GRB 060516: Swift detection of a burst
  25. GRB060515: P200 NIR Observations
  26. GRB 060505 BAT refined analysis
  27. GRB 060515 BAT refined analysis
  28. GRB 060512: TAROT optical observation
  29. GRB 060515: Swift/XRT Team refined analysis
  30. GRB 060515: Swift/UVOT Upper Limits
  31. GRB 060515: Swift/XRT position
  32. GRB 060515: Super-LOTIS Observations
  33. GRB060515: Swift/UVOT initial observation
  34. GRB 060515: TAROT optical observation
  35. GRB 060515: ROTSE-III Optical Limits
  36. GRB 060515: Swift detection of a burst
  37. VLT optical spectroscopy of GRB 060512
  38. Swift/UVOT observations of GRB060512.
  39. GRB 060512: Subaru NIR observation
  40. GRB060512: Swift XRT Team refined analysis
  41. GRB 060512: 1.54m Kuiper Observations
  42. GRB 060512: Detection of NIR afterglow
  43. GRB 060512: P60 Observations
  44. GRB 060512: Swift-BAT Refined Analysis
  45. GRB 060505 - OT candidate + galaxy spectrum
  46. GRB 060512: optical decay
  47. GRB 060512: REM NIR observations
  48. GRB060512 - SDSS Pre-Burst Observations
  49. GRB060512 Name Correction: LT Afterglow detection
  50. GRB060512: Liverpool Telescope Afterglow detection
  51. GRB 060512: Swift detection of a burst with an optical afterglow
  52. GRB 060510A: Swift/UVOT Detection of an Optical Afterglow
  53. GRB 060505: X-ray afterglow - Correction -
  54. GRB 060505: X-ray afterglow
  55. Konus-Wind observation of GRB 060510A
  56. GRB060418: optical observations
  57. GRB 060428a, SMARTS optical/IR afterglow detection
  58. GRB060510B: Swift XRT refined analysis
  59. GRB 060510B: Swift/UVOT Upper Limits
  60. GRB 060510A: Refined analysis of the Swift-BAT burst
  61. GRB 060510B: Swift-BAT Refined Analysis
  62. GRB060510A: XRT refined analysis
  63. GRB060510 - SDSS Pre-Burst Observations
  64. GRB 060510b: Redshift
  65. GRB060510B : Faulkes North Telescope detection
  66. GRB 060510B : Planned XMM-Newton observation
  67. GRB 060510b: Gemini NIR observations
  68. GRB 060510B: Super-LOTIS Observations
  69. GRB 060510b: NIR observations
  70. GRB 060510B: Coordinate correction
  71. GRB 060510B: MDM Observations and candidate OT
  72. GRB 060510B: Swift detection of a burst
  73. GRB 060510: Swift detection of a burst with optical transient
  74. GRB060507: optical afterglow detection
  75. GRB060502B: improvement in the XRT afterglow position
  76. GRB 060507: BART limit
  77. GRB 060507: Final Refined analysis of the Swift-BAT burst
  78. GRB 060507: Swift-BAT Refined Analysis
  79. GRB 060505: PROMPT Observations
  80. GRB 060507: Swift/UVOT Upper Limits
  81. GRB 060507: Swift XRT Team Refined Analysis
  82. GRB 060507: MDM Optical Upper Limit
  83. GRB060507: Swift XRT position
  84. GRB 060507: Swift detection of a burst
  85. GRB 060429: Suzaku WAM observation
  86. GRB060505: Swift/UVOT Observations
  87. GRB 060505: Swift XRT Team Refined Analysis
  88. GRB060425: new MASTER survey method
  89. GRB 060306: Further Analysis of SOAR and APO NIR Observations
  90. GRB 060505: Swift XRT afterglow canditate position
  91. GRB 060502b: Second epoch Gemini observations
  92. GRB 060505: Swift-BAT detection of a weak burst
  93. GRB 060428B: spectroscopy
  94. GRB 060502B: optical observations
  95. GRB 060502B: AROMA refined photometric calibration
  96. GRB 060502B MDM Follow-up Observation
  97. GRB 060502b: Gemini imaging and spectroscopy
  98. GRB060502A, optical observation
  99. GRB 060502B: Swift/UVOT upper limits
  100. GRB 060502A: Swift/UVOT source detection

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