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"

42904 results found.

  1. Swift/UVOT observations of GRB060512.
  2. GRB 060512: Subaru NIR observation
  3. GRB060512: Swift XRT Team refined analysis
  4. GRB 060512: 1.54m Kuiper Observations
  5. GRB 060512: Detection of NIR afterglow
  6. GRB 060512: P60 Observations
  7. GRB 060512: Swift-BAT Refined Analysis
  8. GRB 060505 - OT candidate + galaxy spectrum
  9. GRB 060512: optical decay
  10. GRB060512 - SDSS Pre-Burst Observations
  11. GRB060512 Name Correction: LT Afterglow detection
  12. GRB060512: Liverpool Telescope Afterglow detection
  13. GRB 060512: Swift detection of a burst with an optical afterglow
  14. GRB 060510A: Swift/UVOT Detection of an Optical Afterglow
  15. GRB 060505: X-ray afterglow - Correction -
  16. GRB 060505: X-ray afterglow
  17. Konus-Wind observation of GRB 060510A
  18. GRB060418: optical observations
  19. GRB 060428a, SMARTS optical/IR afterglow detection
  20. GRB060510B: Swift XRT refined analysis
  21. GRB 060510B: Swift/UVOT Upper Limits
  22. GRB 060510A: Refined analysis of the Swift-BAT burst
  23. GRB 060510B: Swift-BAT Refined Analysis
  24. GRB060510A: XRT refined analysis
  25. GRB060510 - SDSS Pre-Burst Observations
  26. GRB 060510b: Redshift
  27. GRB060510B : Faulkes North Telescope detection
  28. GRB 060510b: Gemini NIR observations
  29. GRB 060510B: Super-LOTIS Observations
  30. GRB 060510B: MDM Observations and candidate OT
  31. GRB 060510B: Swift detection of a burst
  32. GRB 060510: Swift detection of a burst with optical transient
  33. GRB060507: optical afterglow detection
  34. GRB060502B: improvement in the XRT afterglow position
  35. GRB 060507: Final Refined analysis of the Swift-BAT burst
  36. GRB 060507: Swift-BAT Refined Analysis
  37. GRB 060505: PROMPT Observations
  38. GRB 060507: Swift/UVOT Upper Limits
  39. GRB 060507: Swift XRT Team Refined Analysis
  40. GRB 060507: MDM Optical Upper Limit
  41. GRB060507: Swift XRT position
  42. GRB 060507: Swift detection of a burst
  43. GRB 060429: Suzaku WAM observation
  44. GRB 060505: Swift XRT Team Refined Analysis
  45. GRB060425: new MASTER survey method
  46. GRB 060306: Further Analysis of SOAR and APO NIR Observations
  47. GRB 060505: Swift XRT afterglow canditate position
  48. GRB 060502b: Second epoch Gemini observations
  49. GRB 060505: Swift-BAT detection of a weak burst
  50. GRB 060428B: spectroscopy
  51. GRB 060502B MDM Follow-up Observation
  52. GRB 060502b: Gemini imaging and spectroscopy
  53. GRB 060502B: Swift/UVOT upper limits
  54. GRB 060502A: Swift/UVOT source detection
  55. GRB 060429: Refined IPN error box and Konus-Wind spectrum
  56. GRB 060502B: MDM Optical Observation
  57. GRB 060502B: Refined analysis of the Swift-BAT short burst
  58. GRB060502B: Swift XRT Team refined analysis
  59. Short GRB 060502B: Tautenburg Observation
  60. GRB 060427B Milagro GeV/TeV Observations
  61. GRB 060502A: TTT Observations
  62. GRB060502B: correction to XRT position
  63. GRB 060501: P60 Observations and Candidate Retraction
  64. GRB 060502B: Swift detection of a short burst
  65. GRB060502: Swift-XRT refined analysis
  66. GRB 060502: Swift-BAT refined analysis
  67. GRB060502: Gemini spectroscopy
  68. GRB 060502: APO Spectroscopic Observations
  69. GRB060501: Swift UVOT followup observations
  70. GRB060502: Super-LOTIS Observations
  71. GRB 060502: P60 Afterglow Confirmation
  72. GRB 060502: Swift detection of a burst with an optical counterpart
  73. GRB 060501: MDM Observations
  74. GRB060501: Super-LOTIS observations
  75. GRB060501: P60 imaging and afterglow candidate
  76. GRB 060501: Refined analysis of the Swift-BAT burst
  77. GRB060501: Swift XRT position
  78. GRB 060501: Swift detection of a burst
  79. IPN triangulation of GRB060429 (short/hard)
  80. Konus-Wind observation of GRB 060427B
  81. GRB060428B - SDSS Pre-Burst Observations
  82. GRB060428B: optical observation
  83. GRB060428B: possible detection of an optical counterpart by Swift/UVOT.
  84. GRB 060428B: MDM Observations
  85. GRB 060428A: PROMPT Observations
  86. GRB 060427B: MASTER optical observations
  87. GRB060428B: Swift XRT Team refined analysis
  88. GRB 060427B: IPN localization of a short hard burst
  89. GRB 060428B: Refined analysis of the Swift-BAT burst
  90. GRB 060428B: KAIT observations
  91. GRB 051117A: Bright host galaxy not confirmed
  92. GRB060428A: Swift/UVOT observations.
  93. GRB 060428A: Refined analysis of the Swift-BAT burst
  94. GRB 060428b: Optical afterglow candidate
  95. GRB060428A: Swift XRT Team refined analysis
  96. GRB 060428B: Swift detection of a burst
  97. GRB 060427: NIR observations
  98. GRB 060428: Swift detection of a burst
  99. GRB 060427: NOT observations
  100. GRB 060427: Refined analysis of the Swift-BAT burst

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