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"

3408 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 140730A: Swift-XRT refined Analysis
  6. GRB 140729A: Swift-XRT and UVOT observations
  7. GRB 140723A: Swift-XRT and UVOT observations
  8. GRB 140719B: Swift XRT observation
  9. GRB 140716A: Confirmation of the Swift-XRT afterglow
  10. GRB 140719A: Swift-XRT refined Analysis
  11. GRB 140716A: Swift-XRT detection of an afterglow candidate
  12. Swift observations of a flare from UX Ari
  13. GRB 140713A: Swift-XRT refined Analysis
  14. GRB 140710A: Swift-XRT refined Analysis
  15. GRB 140709B: Swift-XRT refined Analysis
  16. GRB 140709A: Swift-XRT refined Analysis
  17. GRB 140706A: Swift-XRT refined Analysis
  18. GRB 140705A: Swift-XRT refined Analysis
  19. GRB 140703A: Swift-XRT refined Analysis
  20. GRB 140629A: Nishi-Harima NIR Observations
  21. GRB 140629A: Swift-XRT refined Analysis
  22. GRB 140628A: Swift-XRT refined Analysis
  23. Swift Trigger 602668: XRT and UVOT confirm is not astrophysical source
  24. GRB 140623A: further Swift-XRT observations
  25. GRB 140626A: Swift-XRT refined Analysis
  26. Further Swift/XRT observations of GRB140620A/iPTFcva
  27. GRB 140623A: Swift-XRT and UVOT observations
  28. GRB 140621A: Swift-XRT observations
  29. GRB 140622A: Swift-XRT refined Analysis
  30. GRB 140620A: Swift/UVOT Detection
  31. GRB 140620A: Swift-XRT observations
  32. GRB 140619B: Swift-XRT observations
  33. GRB 140619A: Swift-XRT refined Analysis
  34. GRB 140606B: Swift XRT final light curve
  35. GRB 140614B: MOSFIRE Ks-band nondetection
  36. GRB 140614B: Swift-XRT refined Analysis
  37. GRB 140614B: Swift/UVOT Upper Limits
  38. GRB 140614A: Swift-XRT refined Analysis
  39. GRB 140611A: Swift-XRT observations
  40. GRB 140610A: Swift-XRT refined Analysis
  41. GRB 140606B / iPTF 14bfu: MOSFIRE NIR imaging
  42. GRB 140606B: Swift XRT refined analysis
  43. GRB 140606B: Swift/UVOT Upper Limits
  44. GRB 140606B: Swift XRT position
  45. GRB 140606A: Swift-XRT upper limits
  46. GRB 140523A: further Swift-XRT observations
  47. GRB 140529A: Swift-XRT afterglow detection.
  48. Chandra late-time observations of GRB140515A
  49. GRB 140523A: possible X-ray afterglow candidate from tiled Swift/XRT observations
  50. GRB 140516A: further Swift-XRT analysis
  51. GRB 140518A: Swift-XRT refined Analysis
  52. GRB 140516A: Swift-XRT refined Analysis
  53. GRB 140515A: Swift-XRT refined Analysis
  54. GRB 140515A: Swift/UVOT Upper Limits
  55. GRB 140512A: Continued UVOT Observations
  56. GRB 140512A: Swift-XRT refined Analysis
  57. Swift Observations of GRB 140508A
  58. GRB 140509A: Swift-XRT refined Analysis
  59. GRB 140508A: Swift-XRT observations
  60. GRB 140506A: Swift-XRT refined Analysis
  61. GRB 140502A: Swift-XRT refined Analysis
  62. GRB 140430A: Swift-XRT refined Analysis
  63. GRB 140423A: Nishi-Harima NIR Observations
  64. GRB 140423A: Swift-XRT refined Analysis
  65. GRB 140419A: Continued RATIR Optical and NIR Observations
  66. Konus-Wind observation of GRB 140419A
  67. GRB 140419A: Swift-XRT refined Analysis
  68. GRB 140414A: Swift/UVOT Upper Limit
  69. GRB 140414A: Swift-XRT observations
  70. GRB 140413A: Swift-XRT refined Analysis
  71. GRB 140412A: Swift-XRT refined Analysis
  72. Swift Trigger 595345 is not an astrophysical source
  73. GRB 140408A: Swift-XRT refined Analysis
  74. GRB 140402A: Swift-XRT observations
  75. Swift trigger 594286: Is likely a noise trigger
  76. GRB 140331A: Swift-XRT refined Analysis
  77. Retraction of the Fermi/LAT high-energy counterpart for GRB 140330A
  78. GRB 140323A: Swift-XRT refined Analysis
  79. GRB 140320C: Swift/UVOT Upper Limits
  80. GRB 140320C: Swift-XRT observations
  81. GRB 140320A: Confirmation of a fading X-ray afterglow
  82. GRB 140320C: Swift-XRT detection of the X-ray afterglow
  83. GRB 140320B: Swift-XRT detection of the afterglow
  84. GRB 140320A: Swift-XRT detection of an afterglow candidate
  85. Swift Trigger 592558 is not an astrophysical source
  86. GRB 140318A: Swift-XRT refined Analysis
  87. GRB 140311C: Swift-XRT and UVOT observations
  88. GRB 140311A: Swift-XRT refined Analysis
  89. GRB 140311B: Swift-XRT refined Analysis
  90. GRB 140304A: Swift-XRT refined Analysis
  91. GRB 140302A: Swift/UVOT Upper Limits
  92. GRB 140302A: Swift-XRT refined Analysis
  93. GRB 140301A: Swift-XRT refined Analysis
  94. iPTF14yb: Swift-XRT detection
  95. GRB 140219A: XRT afterglow candidate
  96. GRB 140221A: Results from Swift XRT tiled observations
  97. GRB 140219A: results from Swift XRT and UVOT tiled observations
  98. Swift follow-up of an Integral weak transient
  99. GRB 140211A: Swift-XRT and UVOT observations
  100. GRB 140215A: Swift-XRT 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