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"

43864 results found.

  1. GRB 140808A: Redshift from the 10.4m GTC telescope
  2. GRB 140808A: Swift-XRT observations
  3. GRB 140808A: Fermi GBM detection
  4. GRB 140808A: optical afterglow candidate iPTF14eag
  5. GRB 140801A: AAO optical observations
  6. GRB 140801A: GROND Afterglow detection, unbroken decay
  7. GRB140801A: Swift/XRT further observations
  8. GRB 140730A: GROND Upper limits
  9. GRB 140801A: BTA confirmation of redshift
  10. GRB 140801A: Swift-XRT observations
  11. Konus-Wind observation of GRB 140801A
  12. GRB 140801A : Virtual Telescope optical observations
  13. GRB 140801A: Fermi GBM observation
  14. GRB 140801A: Redshift from the 10.4m GTC telescope
  15. GRB 140801A: NOT afterglow confirmation
  16. IPN triangulation of GRB 140801A (Fermi trigger 428612396)
  17. GRB 140801A: archival upper limits on the host galaxy
  18. GRB 140801A (FERMI trigger 428612396): MASTER brigth OT discovery
  19. GRB 140730A, Swift-BAT refined analysis
  20. GRB 140709B: TShAO optical upper limit
  21. GRB 140709A, the review of the sky area in plate archives
  22. Swift Trigger 607945: possible noise event in the direction of NGC2559
  23. Konus-Wind observation of GRB 140729A
  24. GRB 140730A: LCO-Sutherland observations
  25. GRB 140730A: Swift-XRT refined Analysis
  26. GRB 140730A: Enhanced Swift-XRT position
  27. GRB 140730A: Prompt enhanced Swift-XRT position
  28. GRB 140730A: Swift detection of a burst
  29. Radio upper limit on the GRB 140713A with the GMRT
  30. GRB 140729A: iPTF optical upper limit
  31. Swift Trigger 607506 is probably noise
  32. GRB 140729A: Swift-XRT and UVOT observations
  33. IPN Triangulation of GRB 140729A
  34. GRB 140729A: Fermi-GBM detection
  35. GRB 140729A Tiled Swift observations
  36. GRB 140729A: Fermi-LAT detection
  37. Trigger 607399: Swift detection of SGR1806-20
  38. GRB 140723A: Swift-XRT and UVOT observations
  39. GRB 140723A: LCO-Sutherland optical candidate retraction
  40. GRB 140723A: MASTER optical observation
  41. Konus-Wind observation of GRB 140723A
  42. GRB 140723A: LCO-Sutherland optical candidate
  43. GRB 140723A: Fermi GBM detection
  44. IPN Triangulation of GRB 140723A
  45. GRB 140723A Tiled Swift observations
  46. GRB 140723A: Fermi-LAT detection
  47. GRB 140709B: Swift/UVOT Upper Limits
  48. Konus-Wind observation of GRB 140721A
  49. IPN Triangulation of GRB 140721A
  50. GRB 140719B: Swift XRT observation
  51. GRB 140721A: Fermi GBM detection
  52. GRB 140716A: Confirmation of the Swift-XRT afterglow
  53. GRB 140719B, Swift-BAT refined analysis
  54. GRB 140716A: GROND confirmation of the afterglow
  55. GRB 140719A, Swift-BAT refined analysis
  56. GRB 140719A: FTS observations
  57. GRB 140719A: GROND Afterglow candidate
  58. GRB 140719B: Zadko observatory - Gingin optical observations
  59. GRB 140719B: Swift detection of a burst
  60. GRB 140719A: Swift-XRT refined Analysis
  61. GRB 140719A: Enhanced Swift-XRT position
  62. GRB 140719A: Swift detection of a burst
  63. Konus-Wind observation of GRB 140716A
  64. GRB 140713A: AMI 15 GHz detection
  65. GRB 140713A: 10.4-m GTC deep optical observation
  66. GRB 140716A: GROND afterglow candidate
  67. GRB 140716A: Swift-XRT detection of an afterglow candidate
  68. GRB 140716A: A Fermi GBM Detection
  69. GRB 140716A BAT refined analysis
  70. Swift observations of a flare from UX Ari
  71. GRB 140716A found in ground analysis of Swift-BAT data
  72. GRB 140709A: Possible AMI 15 GHz detection
  73. Swift detection of UX Ari
  74. GRB 140713A: CARMA mm detection
  75. GRB 140714A: Fermi GBM detection
  76. Radio upper limits on the GRB 140703A with the GMRT
  77. GRB 140713A: Fermi GBM detection
  78. GRB 140713A: Swift-XRT refined Analysis
  79. GRB 140713A: Swift/UVOT Upper Limits
  80. GRB 140713A: NOT upper limits
  81. GRB 140713A: Enhanced Swift-XRT position
  82. GRB 140713A: Swift-BAT refined analysis
  83. GRB 140713A: T100 observations
  84. GRB 140710A: iTelescope.Net T11 Optical Observation
  85. GRB 140713A: Swift detection of a burst
  86. Swift Trigger 604111 is not a GRB
  87. GRB 140710B: Fermi GBM detection
  88. GRB 140710B: improved INTEGRAL position
  89. Fermi GBM Observations of SGR 1935+2154
  90. GRB 140710B: a long GRB detected with INTEGRAL
  91. GRB 140709A: Continued RATIR Optical and NIR Observations
  92. GRB 140710A: Swift-XRT refined Analysis
  93. GRB 140710A: Swift-BAT refined analysis
  94. GRB 140709B: update of Khureltogot optical upper limit
  95. GRB 140710A: Gemini-N redshift of likely host
  96. GRB 140710A: Enhanced Swift-XRT position
  97. GRB 140710A: RATIR Optical and NIR Observations
  98. GRB 140710A: P60 Confirmation of Afterglow
  99. GRB 140710A: GROND Detection of NIR Afterglow Candidate
  100. GRB 140709A: 10.4m GTC optical decay

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