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"

6828 results found.

  1. GRB 140808A: Swift-XRT observations
  2. GRB140801A: Swift/XRT further observations
  3. GRB 140801A: Swift/UVOT Upper Limits
  4. GRB 140801A: Swift-XRT observations
  5. GRB 140801A: Fermi GBM observation
  6. GRB 140730A: Swift-XRT refined Analysis
  7. GRB 140729A: Swift-XRT and UVOT observations
  8. GRB 140729A: Fermi-GBM detection
  9. GRB 140729A: Fermi-LAT detection
  10. GRB 140723A: Swift-XRT and UVOT observations
  11. GRB 140723A: Fermi GBM detection
  12. GRB 140723A: Fermi-LAT detection
  13. GRB 140719B: Swift XRT observation
  14. GRB 140721A: Fermi GBM detection
  15. GRB 140716A: Confirmation of the Swift-XRT afterglow
  16. GRB 140719A: Swift-XRT refined Analysis
  17. GRB 140716A: Swift-XRT detection of an afterglow candidate
  18. GRB 140716A: A Fermi GBM Detection
  19. Swift observations of a flare from UX Ari
  20. GRB 140714A: Fermi GBM detection
  21. GRB 140713A: Swift-XRT refined Analysis
  22. GRB 140713A: T100 observations
  23. GRB 140710B: Fermi GBM detection
  24. GRB 140710A: Swift-XRT refined Analysis
  25. GRB 140709B: Swift-XRT refined Analysis
  26. GRB 140709A: Fermi GBM detection
  27. GRB 140709A: Swift-XRT refined Analysis
  28. GRB 140706A: Swift-XRT refined Analysis
  29. GRB 140705A: Swift-XRT refined Analysis
  30. GRB 140629A: SAO RAS Rc band photometry
  31. GRB 140629A, Optical observations
  32. GRB 140703A: Fermi GBM detection
  33. GRB 140703A: Swift-XRT refined Analysis
  34. GRB 140629A: Nishi-Harima NIR Observations
  35. GRB 140629A: Swift-XRT refined Analysis
  36. GRB 140629A: T100 observations
  37. GRB 140629A: NOT optical observations
  38. GRB 140629A : Virtual Telescope optical observations
  39. GRB 140628A: Swift-XRT refined Analysis
  40. GRB 140628A: Swift/UVOT Detection
  41. Swift Trigger 602668: XRT and UVOT confirm is not astrophysical source
  42. GRB 140623A: further Swift-XRT observations
  43. GRB 140626A: Swift-XRT refined Analysis
  44. Further Swift/XRT observations of GRB140620A/iPTFcva
  45. GRB 140624A: Fermi GBM observation of a short burst
  46. GRB 140623A: Swift-XRT and UVOT observations
  47. GRB 140623A / iPTF14cyb: Fermi GBM detection
  48. GRB 140621A: Swift-XRT observations
  49. GRB 140621A: Fermi GBM detection
  50. GRB 140622A: Swift-XRT refined Analysis
  51. GRB 140620A: Swift/UVOT Detection
  52. GRB 140620A: Swift-XRT observations
  53. GRB 140620A / iPTF14cva: Fermi GBM observations
  54. GRB 140619B: Swift-XRT observations
  55. GRB 140619B: Fermi-LAT Detection
  56. GRB 140619B: Fermi GBM detection of a short GRB
  57. GRB 140619A: Swift-XRT refined Analysis
  58. GRB 140606B: Swift XRT final light curve
  59. GRB 140614B: MOSFIRE Ks-band nondetection
  60. GRB 140614B: Swift-XRT refined Analysis
  61. GRB 140614A: Swift-XRT refined Analysis
  62. GRB 140611A: Swift-XRT observations
  63. GRB 140610A: Swift-XRT refined Analysis
  64. GRB 140606B / iPTF 14bfu: MOSFIRE NIR imaging
  65. GRB 140610A: Fermi GBM Detection
  66. GRB 140606B: Swift XRT refined analysis
  67. GRB 140606B: Swift/UVOT Upper Limits
  68. GRB 140606B: Swift XRT position
  69. GRB 140606B: Fermi GBM detection
  70. GRB 140606A: Swift-XRT upper limits
  71. GRB 140523A: further Swift-XRT observations
  72. GRB 140528A: Fermi GBM Detection
  73. GRB 140529A: Swift-XRT afterglow detection.
  74. Chandra late-time observations of GRB140515A
  75. GRB 140523A: possible X-ray afterglow candidate from tiled Swift/XRT observations
  76. GRB 140523A: Fermi-LAT detection
  77. GRB 140523A: Fermi GBM detection
  78. GRB 140423A: TShAO optical observations
  79. GRB 140516A: further Swift-XRT analysis
  80. GRB 140518A: T100 observations
  81. GRB 140518A: Swift-XRT refined Analysis
  82. GRB 140516A: Swift-XRT refined Analysis
  83. GRB 140515A: Swift-XRT refined Analysis
  84. GRB 140423A: HCT optical observations
  85. GRB 140512A: Fermi GBM detection
  86. GRB 140512A: Swift-XRT refined Analysis
  87. Swift Observations of GRB 140508A
  88. GRB 140509A: Swift-XRT refined Analysis
  89. GRB 140508A: Optical Observations via Virtual Telescope
  90. GRB 140508A: Swift-XRT observations
  91. GRB 140508A: Fermi GBM detection
  92. GRB 140506A: Fermi GBM Detection
  93. GRB 140506A: Swift-XRT refined Analysis
  94. GRB 140502A: Swift-XRT refined Analysis
  95. GRB 140502A: Fermi GBM observation
  96. GRB 140501A: Fermi GBM detection
  97. GRB 140430A: Swift-XRT refined Analysis
  98. GRB 140428B: Fermi GBM observation
  99. GRB 140423A: RTT150 optical observations
  100. GRB 140423A: Nishi-Harima NIR Observations

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