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"

11538 results found.

  1. GRB 150523A: LCOGT Cerro-Tololo optical afterglow candidate
  2. GRB 150523A Swift-XRT afterglow detection
  3. GRB 150523B: Swift ToO observations
  4. GRB 150523A: Fermi-LAT detection
  5. GRB 150523A: Fermi GBM detection
  6. GRB 150518A: MASTER-net before, early and after optical stereoscopic observations with possible MP discovery inside MAXI error box
  7. Konus-Wind observation of GRB 150514A
  8. GRB 150514A: GROND Bright Afterglow Confirmation
  9. GRB 150514A: Fermi GBM Detection
  10. GRB 150514A: Swift-XRT afterglow detection
  11. GRB 150514A: Swift ToO observations
  12. GRB 150514A: Fermi-LAT detection
  13. GRB 150512A: CrAO optical observations
  14. GRB 150513A: Fermi GBM detection
  15. GRB 150513A: Fermi-LAT detection
  16. GRB 150512A: Fermi GBM detection
  17. GRB 150512A: iPTF Optical Observations
  18. Konus-Wind observation of GRB 150510A
  19. GRB 150510A: Fermi GBM detection
  20. GRB 150510A: Fermi-LAT Refined Analysis
  21. GRB 150510A: Fermi-LAT detection
  22. Konus-Wind observation of GRB 150430A
  23. GRB 150430A: Fermi GBM Detection
  24. GRB 150426A: Fermi GBM detection
  25. Fermi GBM trigger 150424722 is not a GRB
  26. GRB 150424B: Fermi GBM detection
  27. GRB 150422A: Fermi GBM detection
  28. GRB 150416A: Fermi GBM detection
  29. GRB 150416A: Fermi-LAT detection
  30. Konus-Wind observation of a bright burst from SGR 1935+2154
  31. GRB 150404A: Fermi GBM detection
  32. Konus-Wind observation of GRB 150403A
  33. Fermi trigger 449861706: MASTER-SAAO possible candidate to OT of Short GRB
  34. GRB 150403A: Fermi GBM Detection
  35. GRB 150403A: Fermi-LAT detection
  36. Konus-Wind observation of GRB 150330A
  37. IPN Triangulation of GRB 150330A (long/very intense)
  38. GRB 150330A: Fermi GBM detection
  39. Konus-Wind observation of GRB 150323B
  40. GRB150323C: Fermi GBM detection
  41. GRB 150323B: Fermi GBM observation
  42. GRB 150323B detected in ground analysis of Swift-BAT data
  43. Fermi GBM trigger 150319666 is not a GRB
  44. Konus-Wind observation of GRB 150314A
  45. GRB 150314A: Redshift from OSIRIS/GTC
  46. GRB 150314A: Fermi GBM observation
  47. GRB 150314A: Fermi-LAT detection
  48. Fermi GBM trigger 150312827 is not a GRB
  49. Fermi GBM trigger 150311331 is not a GRB
  50. GRB 150309A: Fermi GBM detection
  51. GRB 150309A: MASTER prompt optical observation
  52. Fermi GBM trigger 150307942 is not a GRB
  53. Fermi GBM trigger 150305751 is not a GRB
  54. GRB 150301B: LCOGT-Sutherland observations
  55. GRB 150301B: Fermi GBM detection
  56. GRB 150301A: Swift-BAT refined analysis
  57. GRB 150301A: Fermi GBM observation
  58. Fermi GBM Observations of Magnetar 4U 0142+61
  59. GRB 150220A: Fermi GBM observation
  60. IPN Triangulation of GRB 150220A
  61. Fermi GBM Observations of SGR 1935+2154
  62. Fermi GBM trigger 150223068 is not a GRB
  63. Fermi GBM trigger 150220229 is not a GRB
  64. GRB 150219A: Fermi GBM observation
  65. GRB 150213A: Fermi GBM detection
  66. GRB 150210A: Swift-XRT observations
  67. GRB 150210A: MASTER SN detection during LAT error box inspection
  68. GRB 150210A: Tiled Swift observations
  69. Konus-Wind observation of GRB 150210A
  70. IPN Triangulation of GRB 150210A
  71. GRB 150210A: Fermi-LAT detection
  72. GRB 150210A: Fermi GBM detection
  73. Konus-Wind observation of GRB 150202B
  74. GRB 150206B: Fermi GBM detection
  75. GRB 150206B: iPTF Optical Observations
  76. GRB 150204A: LCOGT-Sutherland and Siding Springs observations
  77. GRB 150204A: Fermi GBM detection
  78. GRB 150202B: Swift XRT/UVOT observations
  79. GRB 150204A found in ground analysis of Swift-BAT data
  80. IPN Triangulation of GRB 150202B
  81. GRB 150202B: Tiled Swift observations
  82. Fermi GBM trigger 150202624 is not a GRB
  83. GRB 150203A: Fermi GBM observation
  84. GRB 150202B: Fermi GBM detection
  85. GRB 150202B: Fermi-LAT detection
  86. Konus-Wind observation of GRB 150201A
  87. GRB 150201A: Fermi GBM observation
  88. GRB 150128A: MASTER OT detction during inspection
  89. GRB 150127B: Fermi GBM detection
  90. IPN Triangulation of GRB 150127B
  91. IPN Triangulation of GRB 150127A
  92. Konus-Wind observation of GRB 150126A reveals its ultra-long nature
  93. GRB 150127A: Fermi-LAT detection
  94. GRB150127A: Fermi GBM Detection
  95. GRB 150126A: Fermi GBM Detection
  96. GRB 150126A: MAXI/GSC afterglow candidate detection
  97. Konus-Wind observation of GRB 150118B
  98. IPN Triangulation of GRB 150118B (long/intense)
  99. GRB 150118C: Fermi GBM Detection
  100. IPN triangulation of GRB 150118C (short/hard)

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