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"

19594 results found.

  1. GRB 061019: dust-scattered X-ray halo detected in Swift/XRT
  2. GRB 061019: Swift/UVOT upper limit
  3. GRB061019: Swift XRT refined analysis
  4. GRB 061019, Swift-BAT refined analysis
  5. GRB 061019: TAROT La Silla observatory optical observations
  6. GRB061019: Swift/XRT position
  7. GRB 061019: Swift-BAT detection of a burst
  8. GRB 061006: astrometry-corrected XRT position
  9. Konus-Wind observation of GRB 061007
  10. GRB 060928: Confirmation of the X-ray afterglow detected by Swift
  11. GRB061007: Swift UVOT followup observations
  12. GRB 061007: Magellan Spectroscopy
  13. GRB 061007: Correction to GCN 5712
  14. GRB 061007: Swift-BAT refined analysis
  15. GRB 061007: Swift XRT refined analysis
  16. GRB 061006: Swift/UVOT optical observations
  17. Konus-Wind observation of the short hard GRB 061006
  18. GRB 061007 - Faulkes Telescope South Afterglow Confirmation
  19. GRB 061007: Swift detection of a burst with an optical counterpart
  20. GRB 061007: ROTSE-III Detection of Optical Counterpart
  21. GRB 061006: Swift-BAT refined analysis of the short-hard burst
  22. GRB 061006: Swift-XRT Team Refined Analysis
  23. GRB061006 (Swift 232585) might be a short-hard GRB
  24. GRB061006: Faulkes Telescope South Observations
  25. GRB 061006: Swift detection of a burst
  26. GRB061004: Swift/UVOT optical observations
  27. GRB 061004: Swift-XRT Team Refined Analysis
  28. GRB 061004, Swift BAT refined analysis
  29. GRB 061004: Swift detection of a burst
  30. IGR J08408-4503 (= V* LM Vel): Swift detection of a transient
  31. GRB 060928: Swift observations
  32. IPN triangulation of GRB060928 (long, exceptionally bright)
  33. GRB061002: Swift UVOT followup observations
  34. GRB 061002: Swift-XRT Team Refined Analysis
  35. GRB 061002, Swift-BAT refined analysis
  36. GRB061002: MASTER-VWF-Kislovodsk observations
  37. GRB 061002: Swift detection of a burst: CORRECTED CONTENT
  38. GRB 061002: Swift detection of a burst
  39. GRB 060929: Further XRT Refined Analysis
  40. GRB 060929: Swift/UVOT Optical Observations
  41. GRB060929: Swift-XRT refined analysis.
  42. GRB 060929, Swift-BAT further refined analysis - late-time flare
  43. GRB 060929, Swift-BAT refined analysis
  44. GRB 060929: BART observation
  45. GRB 060929: MASTER-VWF-Kislovodsk observations
  46. GRB 060929: BOOTES-IR & OSN observations
  47. Liverpool Telescope observations of GRB 060929
  48. GRB 060929: Swift detection of a burst
  49. GRB 060729: An update on the late-time Swift observations
  50. GRB 060926: Swift-UVOT UVW1 Detection Retraction
  51. GRB 060927: pseudo-z from spectral parameters of the prompt emission
  52. GRB 060927: Swift/UVOT Optical Observations
  53. GRB 060927: Swift XRT Team refined analysis
  54. GRB 060927, Swift-BAT refined analysis
  55. GRB060927: Faulkes Telescope South observation
  56. GRB060927 - SDSS Pre-Burst Observations
  57. GRB 060927A: ROTSE-III Detection of Optical Counterpart
  58. Swift XRT boresight
  59. GRB 060927: Swift detection of a burst
  60. GRB060926: VLT redshift
  61. GRB 060926: Swift-UVOT Detections
  62. GRB 060926: Swift XRT refined analysis
  63. GRB 060926, Swift-BAT refined analysis
  64. GRB 060926: RTT150, UVOT afterglow candidate confirmation
  65. GRB 060926: BOOTES-IR observations
  66. GRB060926 OPTIMA-Burst optical observation
  67. GRB 060926: Swift detection of a burst
  68. GRB 060923C, Swift-BAT refined analysis
  69. GRB 060923C: VLA Observation
  70. GRB 060923A: Gemini Second Epoch and Afterglow Confirmation
  71. GRB060923B: Swift/UVOT upper limits
  72. GRB 060923B: Swift XRT Refined Analysis
  73. GRB 060923C: Swift XRT refined analysis
  74. GRB 060923C, Swift-BAT partial refined analysis
  75. GRB 060923A: Swift XRT refined analysis
  76. GRB 060923A: Keck and Gemini Observations
  77. GRB 060923B, Swift-BAT refined analysis
  78. GRB060923C : Faulkes Telescope South optical limits
  79. GRB060923C: Faulkes Telescope North optical observations
  80. GRB 060923C: Swift detection of a burst
  81. GRB 060923B: Swift detection of a burst
  82. GRB 060923, Swift-BAT refined analysis
  83. GRB 060923: Early Super-LOTIS Observations
  84. GRB060923: Faulkes Telescope North optical observations
  85. GRB 060923: KAIT observations
  86. GRB 060923: Swift detection of a burst
  87. Swift detection of IGR J17497-2821 (trigger 230504)
  88. Swift detects a hard X-ray burst from AXP CXOU J164710.2-455216
  89. GRB060919: Swift/UVOT optical observations
  90. GRB 060919, Swift-BAT refined analysis
  91. GRB060919: XRT refined analysis
  92. GRB 060919: TAROT optical observations
  93. GRB 060919: Swift detection of a burst
  94. GRB 060912A: VLA Observation
  95. GRB060825: MAGIC telescope GeV observation
  96. Konus-Wind observation of GRB 060912
  97. GRB060912: Swift/UVOT Observations
  98. GRB060912: OPTIMA-Burst optical observations
  99. GRB 060912: Swift XRT Team Refined Analysis
  100. GRB 060912, Swift-BAT 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