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"

27777 results found.

  1. GRB 060923: Early Super-LOTIS Observations
  2. GRB060923: Faulkes Telescope North optical observations
  3. GRB 060923: KAIT observations
  4. GRB 060923: Swift detection of a burst
  5. Swift detection of IGR J17497-2821 (trigger 230504)
  6. Swift detects a hard X-ray burst from AXP CXOU J164710.2-455216
  7. GRB060919: Swift/UVOT optical observations
  8. GRB 060919, Swift-BAT refined analysis
  9. GRB060919: XRT refined analysis
  10. GRB 060919: TAROT optical observations
  11. GRB 060919: Swift detection of a burst
  12. GRB 060912A: VLA Observation
  13. GRB060825: MAGIC telescope GeV observation
  14. Konus-Wind observation of GRB 060912
  15. GRB060912: Swift/UVOT Observations
  16. GRB060912: OPTIMA-Burst optical observations
  17. GRB 060912: Swift XRT Team Refined Analysis
  18. GRB 060912, Swift-BAT refined analysis
  19. GRB 060912: Swift detection of a burst with an optical afterglow
  20. VLA observations of GRB 060908
  21. GRB 060908, Swift/XRT refined analysis
  22. GRB 060908: Swift/UVOT Observations
  23. GRB 060908, Swift-BAT refined analysis
  24. GRB 060908 - SDSS Pre-burst Observations
  25. GRB 060908: PROMPT Detection of a Bright Counterpart
  26. GRB 060908: Swift detection of a burst with a bright optical counterpart
  27. GRB 060904A: Suzaku/WAM observation of the prompt emission
  28. GRB060904b optical detections (delayed report due to internet outage)
  29. GRB 060906: Early RAPTOR optical limits
  30. GRB 060906, Swift-BAT refined spectral analysis
  31. GRB 060906: Swift/XRT Refined Analysis
  32. GRB 060906: Swift-UVOT observations
  33. VLT redshift of GRB 060906
  34. GRB 060906, Swift-BAT refined analysis
  35. GRB 060906: KAIT observations
  36. GRB 060906 (?): P60 Optical Afterglow Candidate
  37. GRB 060906: Swift detection of a probable burst
  38. GRB 060904A Milagro GeV/TeV Observations
  39. GRB060904A: Swift/UVOT optical observations
  40. GRB 060904A: pseudo-z from spectral parameters of the prompt emission
  41. GRB 060904B: Swift-BAT refined analysis
  42. GRB060904b: Optical observations with Swift/UVOT
  43. Konus-Wind observation of GRB 060904A
  44. GRB 060904B: Swift-XRT refined analysis
  45. GRB 060904A: Refined analysis of the Swift-BAT burst
  46. GRB 060904A: Swift-XRT refined analysis
  47. GRB 060904A: Suzaku-XIS and -HXD observation plan
  48. GRB 060904B: Optical observations at Crni Vrh
  49. GRB060904B: Watcher observations
  50. GRB 060904B BOOTES-IR and 1.5m OSN observations
  51. GRB 060904B: TAROT optical counterpart observations
  52. GRB060904B - SDSS Pre-Burst Observations
  53. GRB 060904: TAROT optical observations
  54. GRB 060904B: Swift detection of a burst with optical counterpart
  55. GRB 060904B: ROTSE-III Detection of Optical Counterpart
  56. GRB060904 - SDSS Pre-Burst Observations
  57. GRB 060904: Swift detection of a bright burst
  58. 060901: Swift UVOT followup observations
  59. GRB 060901: SMARTS optical/IR observations update
  60. GRB 060901: Swift/XRT Refined Analysis
  61. GRB 060901: SMARTS optical/IR observations
  62. GRB 060901: Swift/XRT Position
  63. GRB 060901: Watcher observations
  64. GRB 060604: VLA Observation
  65. GRB 060814: Suzaku/WAM observation of the prompt emission
  66. GRB 060605: VLA Observation
  67. GRB 060707: VLA observation
  68. GRB 060825: VLA observations
  69. GRB 060825: pseudo-z from spectral parameters of the prompt emission
  70. Swift-BAT trigger 226614 is not a GRB
  71. GRB060826 - SDSS Pre-Burst Observations
  72. GRB 060826(?): Swift detection of a possible burst
  73. GRB 060825: XRT Team Refined Analysis
  74. GRB 060825: Swift-BAT Refined Analysis
  75. GRB 060813: Swift/BAT, Konus-Wind, and Suzaku/WAM joint prompt spectral analysis
  76. GRB060825: Liverpool Telescope optical observations
  77. GRB 060825: TAROT optical observations
  78. GRB060825: BOOTES-IR optical observations
  79. GRB 060825: Swift detection of a burst
  80. GRB060729: analysis of XMM-Newton observation
  81. GRB 060814: pseudo-z from spectral parameters of the prompt
  82. Radio observations of GRB 060719
  83. GRB060814: Break in the XRT light curve
  84. GRB060813: Break in the XRT light curve
  85. GRB 060813: A long, bright GRB detected with Suzaku WAM
  86. Konus-Wind observation of GRB 060814
  87. GRB 060814: Refined analysis of the Swift-BAT burst
  88. GRB060805B: optical observations
  89. GRB060814: Swift/UVOT upper limits
  90. GRB 060813: pseudo-z from spectral parameters of the prompt
  91. GRB 060814: Swift XRT refined analysis
  92. GRB 060814 - SDSS Pre-Burst Observations
  93. GRB 060814: TAROT optical observations
  94. GRB 060814: Swift detection of a bright burst
  95. Konus-Wind observation of GRB 060813
  96. GRB060813: Swift/UVOT upper limits
  97. GRB 060813: Swift XRT refined analysis
  98. GRB 060813: Refined analysis of the Swift-BAT burst
  99. GRB 060813: Swift detection of a burst
  100. Image of the dust-scattering halo around SGR 1806-20

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