Skip to main content
Updates to LVK & CHIME Notices, Schema v7.2.3! 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. GRB060510B: Swift XRT refined analysis
  2. GRB 060510B: Swift/UVOT Upper Limits
  3. GRB 060510A: Refined analysis of the Swift-BAT burst
  4. GRB 060510B: Swift-BAT Refined Analysis
  5. GRB060510A: XRT refined analysis
  6. GRB060510 - SDSS Pre-Burst Observations
  7. GRB 060510b: Redshift
  8. GRB060510B : Faulkes North Telescope detection
  9. GRB 060510B : Planned XMM-Newton observation
  10. GRB 060510b: Gemini NIR observations
  11. GRB 060510B: Super-LOTIS Observations
  12. GRB 060510b: NIR observations
  13. GRB 060510B: Coordinate correction
  14. GRB 060510B: MDM Observations and candidate OT
  15. GRB 060510B: Swift detection of a burst
  16. GRB 060510: Swift detection of a burst with optical transient
  17. GRB060507: optical afterglow detection
  18. GRB060502B: improvement in the XRT afterglow position
  19. GRB 060507: BART limit
  20. GRB 060507: Final Refined analysis of the Swift-BAT burst
  21. GRB 060507: Swift-BAT Refined Analysis
  22. GRB 060505: PROMPT Observations
  23. GRB 060507: Swift/UVOT Upper Limits
  24. GRB 060507: Swift XRT Team Refined Analysis
  25. GRB 060507: MDM Optical Upper Limit
  26. GRB060507: Swift XRT position
  27. GRB 060507: Swift detection of a burst
  28. GRB 060429: Suzaku WAM observation
  29. GRB060505: Swift/UVOT Observations
  30. GRB 060505: Swift XRT Team Refined Analysis
  31. GRB060425: new MASTER survey method
  32. GRB 060306: Further Analysis of SOAR and APO NIR Observations
  33. GRB 060505: Swift XRT afterglow canditate position
  34. GRB 060502b: Second epoch Gemini observations
  35. GRB 060505: Swift-BAT detection of a weak burst
  36. GRB 060428B: spectroscopy
  37. GRB 060502B: optical observations
  38. GRB 060502B: AROMA refined photometric calibration
  39. GRB 060502B MDM Follow-up Observation
  40. GRB 060502b: Gemini imaging and spectroscopy
  41. GRB060502A, optical observation
  42. GRB 060502B: Swift/UVOT upper limits
  43. GRB 060502A: Swift/UVOT source detection
  44. GRB 060429: Refined IPN error box and Konus-Wind spectrum
  45. GRB 060502B: MDM Optical Observation
  46. GRB 060502B: AROMA optical observations
  47. GRB 060502B: Refined analysis of the Swift-BAT short burst
  48. GRB060502B: Swift XRT Team refined analysis
  49. Short GRB 060502B: Tautenburg Observation
  50. GRB 060427B Milagro GeV/TeV Observations
  51. GRB 060502A: TTT Observations
  52. GRB060502B: correction to XRT position
  53. GRB 060501: P60 Observations and Candidate Retraction
  54. GRB 060502B: Xinglong optical observation
  55. GRB 060502B: MASTER optical observations
  56. GRB 060502B: Swift detection of a short burst
  57. GRB060502: Swift-XRT refined analysis
  58. GRB 060502: Swift-BAT refined analysis
  59. GRB060502: Gemini spectroscopy
  60. GRB 060502: APO Spectroscopic Observations
  61. GRB060501: Swift UVOT followup observations
  62. GRB060502: Super-LOTIS Observations
  63. GRB 060502: P60 Afterglow Confirmation
  64. GRB 060502: Swift detection of a burst with an optical counterpart
  65. GRB 060501: MDM Observations
  66. GRB060501: Super-LOTIS observations
  67. GRB060501: P60 imaging and afterglow candidate
  68. GRB 060501: Refined analysis of the Swift-BAT burst
  69. GRB060501: Swift XRT position
  70. GRB 060501: ROTSE-III Optical Limits
  71. GRB 060501: Swift detection of a burst
  72. IPN triangulation of GRB060429 (short/hard)
  73. Konus-Wind observation of GRB 060427B
  74. GRB060428B - SDSS Pre-Burst Observations
  75. GRB060428B: optical observation
  76. GRB060428B: possible detection of an optical counterpart by Swift/UVOT.
  77. GRB 060428B: MDM Observations
  78. GRB 060428A: PROMPT Observations
  79. GRB 060427B: MASTER optical observations
  80. GRB060428B: Swift XRT Team refined analysis
  81. GRB 060427B: IPN localization of a short hard burst
  82. GRB 060428B: Refined analysis of the Swift-BAT burst
  83. GRB 060428B: Xinglong I-band limit
  84. GRB 060428B: KAIT observations
  85. GRB060425:MASTER optical limit
  86. GRB 051117A: Bright host galaxy not confirmed
  87. GRB060428A: Swift/UVOT observations.
  88. GRB060428B, optical observation
  89. GRB 060428A: Refined analysis of the Swift-BAT burst
  90. GRB 060428b : Kiso R-band limit
  91. GRB060427:MASTER optical limit
  92. GRB 060428b: Optical afterglow candidate
  93. GRB060428A: Swift XRT Team refined analysis
  94. GRB 060428B: Swift detection of a burst
  95. GRB 060427: NIR observations
  96. GRB060427: Xinglong optical Observations
  97. GRB 060428: Swift detection of a burst
  98. GRB 060427: NOT observations
  99. GRB 060427: Swift/UVOT upper limits.
  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