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"

26052 results found.

  1. GRB 060605: ROTSE-III Optical Counterpart
  2. GRB 060605: Swift detection of a burst with optical counterpart
  3. GRB 060605: ROTSE-III Detection of Optical Counterpart
  4. GRB060604: Swift/UVOT detections
  5. GRB 060604: redshift
  6. GRB 060512: Keck Redshift
  7. GRB 060604 optical photometry
  8. GRB 060604: Swift-XRT Team refined analysis
  9. GRB 060604: BAT refined analysis
  10. GRB 060604A: ROTSE-III Optical Limits
  11. GRB 060604: Swift detection of a burst with possible optical counterpart
  12. GRB 060602A: Swift-BAT Refined Analysis: Correction
  13. GRB 060602B: XMM-Newton Survey Source
  14. GRB 060602B: Swift-XRT Refined Analysis
  15. GRB 060602B: Swift-BAT Refined Analysis
  16. GRB 060602B: Swift/UVOT observations
  17. GRB 060602A: Swift-BAT Refined Analysis
  18. GRB 060602B: RTT150 optical observations
  19. GRB 060211A : WIDGET simultaneous optical observations
  20. GRB 060526: Tautenburg Second Epoch Observations
  21. GRB 060602B: Swift detection of a burst
  22. GRB060602B: BOOTES-IR candidate afterglow
  23. GRB060602 - SDSS Pre-Burst Observations
  24. GRB 060602: Swift detection of a burst
  25. GRB 060502A: Optical afterglow observations
  26. GRB 060526: Break in X-ray light curve
  27. GRB 060526: RTT150 optical observations
  28. GRB 051227 : WIDGET simultaneous optical observations
  29. GRB 051028 : WIDGET pre-trigger limit
  30. GRB 060526: RTT150 optical observations
  31. GRB 060526: Multiple Optical Flares
  32. GRB060526: afterglow fitting and probable jet break
  33. GRB 060526: RTT150 optical observations
  34. GRB060526: Optical counterpart from MIRO
  35. GRB060502b: optical observations
  36. GRB 060526: RTT150 optical observations
  37. GRB 060526: Tautenburg OT observation and light curve fitting
  38. GRB 060526: SMARTS optical/IR afterglow observations
  39. GRB 060526: REM observations
  40. GRB 060526: RTT150 optical observations, afterglow flattening
  41. GRB 060526: Optical Flare
  42. GRB 060526: MDM-2.4m Observations
  43. GRB 060526: Refined analysis of the Swift-BAT burst
  44. GRB 060526: RTT150 optical observations
  45. GRB060526: Further Swift-UVOT Observations
  46. GRB 060526: Magellan Redshift
  47. GRB 060526 Lulin optical observation
  48. GRB 060526: Swift/XRT Team refined analysis
  49. GRB 060526: TNG optical observations
  50. GRB 060526: ROTSE-III Observations of Optical Counterpart
  51. GRB 060526: Watcher Observations
  52. GRB 060526: Continued emission for the Swift burst
  53. GRB 060526: Swift detection of a burst with x-ray and optical afterglow
  54. GRB060505: VLT observations of the optical afterglow
  55. GRB 060413 : WIDGET simultaneous optical observations
  56. GRB 060522: Swift/UVOT Observations: Correction
  57. GRB 060522: Swift/UVOT Observations of the Optical Afterglow
  58. XMM-Newton observation of GRB060510b
  59. GRB060512: Late-Time P200 Observations
  60. GRB060522: z = 5.11 Keck-LRIS Redshift
  61. GRB 060522: Swift/XRT Team refined analysis
  62. GRB 060522: Swift-BAT Refined Analysis
  63. GRB 060522: REM NIR observations
  64. GRB 060522: TNG optical observations
  65. GRB 060522: Swift detection of a burst with possible optical afterglow
  66. GRB 060515: NIR observation
  67. GRB 060210: Jet Break in the XRT light curve
  68. GRB 060516: Refined analysis of the Swift-BAT burst
  69. GRB 060516: Swift detection of a burst
  70. GRB060515: P200 NIR Observations
  71. GRB 060505 BAT refined analysis
  72. GRB 060515 BAT refined analysis
  73. GRB 060512: TAROT optical observation
  74. GRB 060515: Swift/XRT Team refined analysis
  75. GRB 060515: Swift/UVOT Upper Limits
  76. GRB 060515: Swift/XRT position
  77. GRB 060515: Super-LOTIS Observations
  78. GRB060515: Swift/UVOT initial observation
  79. GRB 060515: TAROT optical observation
  80. GRB 060515: ROTSE-III Optical Limits
  81. GRB 060515: Swift detection of a burst
  82. VLT optical spectroscopy of GRB 060512
  83. Swift/UVOT observations of GRB060512.
  84. GRB060512: Swift XRT Team refined analysis
  85. GRB 060512: Detection of NIR afterglow
  86. GRB 060512: P60 Observations
  87. GRB 060512: Swift-BAT Refined Analysis
  88. GRB 060505 - OT candidate + galaxy spectrum
  89. GRB 060512: optical decay
  90. GRB 060512: REM NIR observations
  91. GRB060512 Name Correction: LT Afterglow detection
  92. GRB060512: Liverpool Telescope Afterglow detection
  93. GRB 060512: Swift detection of a burst with an optical afterglow
  94. GRB 060510A: Swift/UVOT Detection of an Optical Afterglow
  95. GRB 060505: X-ray afterglow - Correction -
  96. GRB 060505: X-ray afterglow
  97. Konus-Wind observation of GRB 060510A
  98. GRB060418: optical observations
  99. GRB 060428a, SMARTS optical/IR afterglow detection
  100. GRB060510B: Swift XRT refined analysis

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