Skip to main content
New! Browse Circulars by Event, Advanced Search, Sample Codes, Schema Release. 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"

18682 results found.

  1. GRB060602 - SDSS Pre-Burst Observations
  2. GRB 060602: Swift detection of a burst
  3. GRB 060526: Break in X-ray light curve
  4. GRB 051227 : WIDGET simultaneous optical observations
  5. GRB 060526: Multiple Optical Flares
  6. GRB060502b: optical observations
  7. GRB 060526: Optical Flare
  8. GRB 060526: Refined analysis of the Swift-BAT burst
  9. GRB 060526: RTT150 optical observations
  10. GRB060526: Further Swift-UVOT Observations
  11. GRB 060526: Swift/XRT Team refined analysis
  12. GRB 060526: ROTSE-III Observations of Optical Counterpart
  13. GRB 060526: Watcher Observations
  14. GRB 060526: Continued emission for the Swift burst
  15. GRB 060526: Swift detection of a burst with x-ray and optical afterglow
  16. GRB 060413 : WIDGET simultaneous optical observations
  17. GRB 060522: Swift/UVOT Observations: Correction
  18. GRB 060522: Swift/UVOT Observations of the Optical Afterglow
  19. XMM-Newton observation of GRB060510b
  20. GRB 060522: Swift/XRT Team refined analysis
  21. GRB 060522: Swift-BAT Refined Analysis
  22. GRB 060522: Swift detection of a burst with possible optical afterglow
  23. GRB 060210: Jet Break in the XRT light curve
  24. GRB 060516: Refined analysis of the Swift-BAT burst
  25. GRB 060516: Swift detection of a burst
  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. Swift/UVOT observations of GRB060512.
  38. GRB060512: Swift XRT Team refined analysis
  39. GRB 060512: Detection of NIR afterglow
  40. GRB 060512: Swift-BAT Refined Analysis
  41. GRB060512 Name Correction: LT Afterglow detection
  42. GRB060512: Liverpool Telescope Afterglow detection
  43. GRB 060512: Swift detection of a burst with an optical afterglow
  44. GRB 060510A: Swift/UVOT Detection of an Optical Afterglow
  45. GRB 060505: X-ray afterglow - Correction -
  46. GRB 060505: X-ray afterglow
  47. Konus-Wind observation of GRB 060510A
  48. GRB 060428a, SMARTS optical/IR afterglow detection
  49. GRB060510B: Swift XRT refined analysis
  50. GRB 060510B: Swift/UVOT Upper Limits
  51. GRB 060510A: Refined analysis of the Swift-BAT burst
  52. GRB 060510B: Swift-BAT Refined Analysis
  53. GRB060510A: XRT refined analysis
  54. GRB 060510B: Super-LOTIS Observations
  55. GRB 060510B: MDM Observations and candidate OT
  56. GRB 060510B: Swift detection of a burst
  57. GRB 060510: Swift detection of a burst with optical transient
  58. GRB060502B: improvement in the XRT afterglow position
  59. GRB 060507: BART limit
  60. GRB 060507: Final Refined analysis of the Swift-BAT burst
  61. GRB 060507: Swift-BAT Refined Analysis
  62. GRB 060507: Swift/UVOT Upper Limits
  63. GRB 060507: Swift XRT Team Refined Analysis
  64. GRB 060507: MDM Optical Upper Limit
  65. GRB060507: Swift XRT position
  66. GRB 060507: Swift detection of a burst
  67. GRB060505: Swift/UVOT Observations
  68. GRB 060505: Swift XRT Team Refined Analysis
  69. GRB 060505: Swift XRT afterglow canditate position
  70. GRB 060505: Swift-BAT detection of a weak burst
  71. GRB 060502B MDM Follow-up Observation
  72. GRB060502A, optical observation
  73. GRB 060502B: Swift/UVOT upper limits
  74. GRB 060502A: Swift/UVOT source detection
  75. GRB 060502B: MDM Optical Observation
  76. GRB 060502B: Refined analysis of the Swift-BAT short burst
  77. GRB060502B: Swift XRT Team refined analysis
  78. GRB060502B: correction to XRT position
  79. GRB 060502B: MASTER optical observations
  80. GRB 060502B: Swift detection of a short burst
  81. GRB060502: Swift-XRT refined analysis
  82. GRB 060502: Swift-BAT refined analysis
  83. GRB 060502: APO Spectroscopic Observations
  84. GRB060501: Swift UVOT followup observations
  85. GRB060502: Super-LOTIS Observations
  86. GRB 060502: Swift detection of a burst with an optical counterpart
  87. GRB 060501: MDM Observations
  88. GRB060501: Super-LOTIS observations
  89. GRB060501: P60 imaging and afterglow candidate
  90. GRB 060501: Refined analysis of the Swift-BAT burst
  91. GRB060501: Swift XRT position
  92. GRB 060501: ROTSE-III Optical Limits
  93. GRB 060501: Swift detection of a burst
  94. GRB060428B: optical observation
  95. GRB060428B: possible detection of an optical counterpart by Swift/UVOT.
  96. GRB 060428B: MDM Observations
  97. GRB060428B: Swift XRT Team refined analysis
  98. GRB 060427B: IPN localization of a short hard burst
  99. GRB 060428B: Refined analysis of the Swift-BAT burst
  100. GRB 060428B: KAIT observations

Advanced

Download all Circulars as a .tar.gz archive:
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