Skip to main content
JSON Notices via Email, Kafka Cron Jobs, Submitter Profile, GCN is Hiring. See news and announcements

GCN Circulars

GCN Circulars are rapid bulletins submitted by and distributed to the community. 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"

19607 results found.

  1. GRB 151021A: Skynet PROMPT-CTIO/DSO17 observations of the optical afterglow
  2. GRB 151023A: Swift-BAT refined analysis
  3. LIGO/Virgo G194575: Swift observations
  4. GRB 151023A: Swift-XRT refined Analysis
  5. GRB 151023A: Swift/UVOT Upper Limits
  6. GRB 151023A
  7. GRB 151023A: Enhanced Swift-XRT position
  8. GRB 151022A: Swift/UVOT Upper Limits
  9. GRB 151022A: Swift-BAT refined analysis
  10. GRB 151023A: Swift detection of a burst
  11. GRB 151022A: RATIR Upper Limits
  12. GRB 151022A: Swift-XRT refined Analysis
  13. LIGO/Virgo G194575: Fermi GBM Observations
  14. GRB 151022A: Enhanced Swift-XRT position
  15. LIGO/Virgo G194575: Identification of a GW CBC Candidate
  16. GRB 151022A: Mondy optical upper limit
  17. GRB 151022A: Kanata/HOWPol optical observation
  18. GRB 151022A: Prompt enhanced Swift-XRT position
  19. GRB 151022A: MASTER-Ural observations
  20. GRB 151022A: Swift detection of a burst
  21. Konus-Wind observation of GRB 151021A
  22. GRB 151021A: Swift/UVOT Detection
  23. GRB 151021A: Swift-XRT refined Analysis
  24. GRB 151021A: Swift-BAT refined analysis
  25. GRB 151021A: Enhanced Swift-XRT position
  26. GRB 151021A: MASTER-NET bright OT detection
  27. GRB 151021A: Swift detection of a burst
  28. GRB 151004A: Swift-XRT follow-up observations
  29. Trigger 659734: Swift detection of SAX J1750.8-2900 or other source near Galactic center
  30. GRB 151006A: Mondy optical upper limit
  31. Konus-Wind observation of GRB 151006A
  32. Swift Trigger 658045 is not a GRB
  33. GRB 151006A: Swift-BAT refined analysis
  34. GRB 151006A: Swift-XRT refined Analysis
  35. GRB 151006A: Fermi-LAT detection
  36. GRB 151006A: Swift/UVOT Upper Limits
  37. GRB 151006A: Fermi GBM detection
  38. GRB 151006A: Enhanced Swift-XRT position
  39. Konus-Wind observation of GRB 151001B
  40. GRB 151006A: Kanata/HOWPol optical imaging polarimetry
  41. GRB 151006A: Prompt enhanced Swift-XRT position
  42. GRB 151006A: Swift detection of a burst
  43. Trigger 657564 / GRB 151004A: Swift BAT and XRT refined analysis
  44. Trigger 657564 / GRB 151004A: Swift/UVOT Upper Limits
  45. Swift Trigger 657564: MASTER-NET early optical observations.
  46. Swift Trigger 657564: XRT prompt analysis
  47. Swift Trigger 657564: a probable GRB
  48. GRB 151001A: Swift-BAT refined analysis
  49. GRB 151001A: RATIR Observations
  50. GRB 151001B: Swift/UVOT Upper Limits
  51. GRB 151001B: Swift-XRT refined Analysis
  52. GRB 151001B: Swift-BAT refined analysis
  53. GRB 151001A: Swift/UVOT Detection
  54. GRB 151001B: MASTER-NET early optical observations.
  55. GRB 151001A: NOT imaging
  56. GRB 151001A: Swift-XRT refined Analysis
  57. GRB 151001B: Enhanced Swift-XRT position
  58. GRB 151001A: Enhanced Swift-XRT position
  59. GRB 151001A: Fermi GBM detection
  60. GRB 151001B: Swift detection of a burst
  61. GRB 151001A: Swift detection of a burst with an optical counterpart
  62. GRB 150925A: Swift/UVOT Upper Limits
  63. GRB 150925A: Swift-BAT refined analysis
  64. GRB 150925A: Swift-XRT refined Analysis
  65. GRB 150925A: Enhanced Swift-XRT position
  66. GRB 150925A: Swift detection of a burst
  67. ANTARES neutrino detection: Fermi GBM Observations
  68. LIGO/Virgo G184098: Swift follow-up observations
  69. LIGO/Virgo G184098: Nearby Galaxies in Error Circle
  70. LIGO/Virgo G184098: Swift follow-up observations
  71. GRB 150915A: Swift-XRT refined Analysis
  72. GRB 150915A, Swift-BAT refined analysis
  73. Konus-Wind observation of GRB 150911A
  74. GRB 150915A: Swift UVOT upper limits
  75. GRB 150915A: GROND detection of an optical counterpart candidate
  76. GRB 150915A: MASTER-NET optical observations
  77. GRB 150915A: Swift detection of a burst
  78. GRB 150910A: T100 observations
  79. GRB 150911A: GROND Upper Limits
  80. GRB 150907A: Swift-XRT afterglow detection
  81. GRB 150912A: Swift-XRT and UVOT observations
  82. GRB 150912A: Swift ToO observations
  83. GRB150911A: P60 Observations
  84. GRB 150911A: Swift/UVOT Upper Limits
  85. GRB 150911A: Swift-BAT refined analysis
  86. GRB 150911A: Swift-XRT refined Analysis
  87. GRB 150910A: VLA Detection
  88. GRB 150911A: Enhanced Swift-XRT position
  89. GRB 150911A: Swift detection of a burst
  90. GRB 150910A: GROND observation of the afterglow
  91. GRB 150910A: Swift-XRT refined Analysis
  92. GRB 150910A: Enhanced Swift-XRT position
  93. GRB 150910A: Swift/UVOT Detection of a Brightening Afterglow
  94. GRB 150910A: Swift-BAT refined analysis
  95. GRB 150910A: LCOGT FTN afterglow observations
  96. GRB 150910A: KAIT Optical Afterglow Detection
  97. GRB 150910A: Swift detection of a burst with an optical afterglow
  98. Swift Trigger 654954 is not an astrophysical event
  99. GRB 150907B: Swift-XRT refined Analysis
  100. IPN Triangulation of GRB 150906B (short/intense)

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