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"

19599 results found.

  1. GRB 130623A: Fermi GBM detection
  2. GRB130627B: Swift/UVOT Observations
  3. GRB 130627B: Swift-XRT observations
  4. GRB 130626A: Swift-XRT possible detection and UVOT upper limits
  5. GRB 130627B: Swift detection of a burst
  6. GRB 130627A: Swift-XRT observations
  7. GRB 130627A: Swift/UVOT Observation
  8. GRB 130627A: Swift detection of a burst
  9. Swift Trigger 559108 is not astrophysical
  10. GRB 130626A: Swift detection of a short burst
  11. GRB 130625A: Swift-XRT refined Analysis
  12. GRB 130625A: MASTER afterglow limit
  13. GRB 130625A: Swift/UVOT Upper Limits
  14. GRB 130623A: Swift-XRT and UVOT observations
  15. GRB 130625A: Swift-BAT refined analysis
  16. GRB 130625A: Enhanced Swift-XRT position
  17. GRB 130625A: Swift detection of a burst
  18. GRB 130603B: First epoch of XMM-Newton observations
  19. GRB 130623A detected in ground analysis of Swift-BAT data
  20. Swift Trigger 558828 is not an interesting event
  21. Swift Trigger 558631: AAO optical observations
  22. GRB 130614A: Suzaku WAM observation of the prompt emission
  23. Swift Trigger 558631 is not a real source
  24. GRB 130612A: Swift-BAT refined analysis
  25. GRB 130612A: Continued Skynet/PROMPT/GORT/DSO observations
  26. Fermi/GBM observation of the Soft Gamma Repeater SGR J1550-5418
  27. Trigger 558399: Swift detection of the Soft Gamma Repeater AXP 1E1547.0-5408
  28. Swift Trigger 557910 is not astrophysical
  29. GRB 130615A: Continued Skynet/PROMPT Observations
  30. GRB 130610A: TAROT La Silla observatory optical observations
  31. GRB 130610A: CrAO optical observations
  32. GRB 130615A: Zadko observatory - Gingin optical observations
  33. GRB 130615A: TAROT La Silla observatory optical observations
  34. GRB 130615A: Swift-XRT refined Analysis
  35. GRB 130615A: Swift/UVOT Upper Limits
  36. GRB 130615A: Skynet/PROMPT Observations
  37. GRB 130615A: Enhanced Swift-XRT position
  38. GRB 130615A: Swift-BAT refined analysis
  39. GRB 130615A: GROND afterglow candidate
  40. GRB 130615A: Swift detection of a burst
  41. GRB 130612A: Fermi GBM observation
  42. GRB 130603B: Detection of possible afterglow/kilonova in HST observations
  43. GRB 130606B: Suzaku WAM observation of the prompt emission
  44. GRB 130612A: ISON-NM optical observations
  45. GRB 130612A: Swift/UVOT Detection
  46. GRB 130612A: Swift-XRT refined Analysis
  47. GRB 130612A: Zadko observatory - Gingin optical observations
  48. GRB 130612A: Enhanced Swift-XRT position
  49. GRB 130612A: TAROT La Silla observatory optical observations
  50. GRB 130612A: RATIR Optical Observations
  51. GRB 130612A: P60 Observations
  52. GRB 130612A: Skynet/PROMPT detection of the optical afterglow
  53. GRB 130612A: PAIRITEL NIR Afterglow Observations
  54. GRB 130612A: Liverpool Telescope Afterglow detection
  55. GRB 130612A: Swift detection of a burst with an optical counterpart
  56. GRB 130609A: Swift/UVOT Upper Limits
  57. GRB 130608A: Swift/UVOT Upper Limits
  58. GRB 130609B: Fermi GBM observation
  59. GRB 130609B, Further Swift-BAT refined analysis
  60. GRB 130609B: GROND observations
  61. GRB 130606A: CrAO optical upper limit
  62. GRB 130609A: Radio Observations (5.8, 22 and 85 GHz)
  63. GRB 130609B, Swift-BAT refined analysis
  64. GRB 130610A: ISON-NM optical observations
  65. GRB 130610A: Swift/UVOT Observations
  66. GRB 130610A: Fermi GBM Observation
  67. GRB 130609B: Swift/UVOT Observations
  68. Konus-Wind observation of GRB 130609B
  69. GRB 130606B: Swift/UVOT Upper Limit
  70. GRB 130610A: Swift-XRT refined Analysis
  71. GRB 130609B: Swift-XRT refined Analysis
  72. GRB 130610A: Enhanced Swift-XRT position
  73. GRB 130608A: Further Swift-BAT analysis
  74. GRB 130610A, Swift-BAT refined analysis
  75. GRB 130609B: Enhanced Swift-XRT position
  76. GRB 130610A: P60 Observations
  77. GRB 130610A: PAIRITEL NIR Afterglow Observations
  78. GRB 130610A: Skynet/PROMPT detection of the optical afterglow
  79. GRB 130610A - Liverpool Telescope Optical Afterglow Confirmation
  80. GRB 130610A: Swift detection of a burst with an optical counterpart
  81. GRB 130609B: Swift detection of a burst with an optical counterpart
  82. GRB 130609A: Fermi GBM observation
  83. GRB 130608A: Swift-XRT refined Analysis
  84. GRB 130609A: Swift-XRT refined Analysis
  85. GRB 130608A: RATIR Optical and NIR Observations
  86. GRB 130609A: Enhanced Swift-XRT position
  87. GRB 130609A, Swift-BAT refined analysis
  88. GRB 130608A: Swift-BAT refined analysis
  89. GRB 130608A: Enhanced Swift-XRT position
  90. GRB 130609A: RATIR Optical and NIR Observations
  91. GRB 130609A: Swift detection of a burst
  92. GRB 130608A: Swift detection of a burst
  93. GRB 130606A: Continued Skynet/PROMPT observations
  94. Swift Trigger 557674 was due to an onboard position error
  95. Swift Trigger 557674 is a probable new Galactic transient
  96. GRB 130606B: Swift-XRT observations
  97. GRB 130606A, Swift-BAT refined analysis
  98. GRB 130606A: TAROT Calern observatory early optical observations
  99. GRB 130606A: Skynet/PROMPT detection of the optical afterglow
  100. GRB 130606A: Swift/UVOT Upper Limits

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