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"

3400 results found.

  1. Enhanced Swift-XRT position of SGR 0501+4516
  2. SGR 0501+4516: Swift XRT measure of the spin period
  3. GRB 080825B: Swift-XRT team analysis
  4. GRB 080810: Swift-XRT Team refined analysis
  5. GRB 080810: KANATA optical-NIR observation, update
  6. GRB 080723B: XMM-Newton observation
  7. GRB 080805: Swift-XRT Refined Analysis
  8. GRB 080804: Swift-XRT Refined Analysis
  9. GRB080804: Gemini South redshift confirmation
  10. GRB 080727C: Swift XRT refined analysis
  11. GRB 080727B: Swift-XRT refined analysis
  12. GRB 080727A: Swift-XRT refined analysis
  13. GRB080723B: Swift/UVOT Upper Limits
  14. GRB 080723B - Swift-XRT refined analysis
  15. GRB 080723B - Swift-XRT position
  16. GRB 080723A: Swift-XRT refined analysis
  17. GRB 080721: Swift-XRT refined analysis
  18. GRB 080702B: Swift XRT confirmation of the afterglow
  19. GRB 080710: Swift-XRT refined analysis
  20. GRB 080707: possible break in the X-rays
  21. GRB 080707: Swift XRT refined analysis
  22. Refined analysis of Swift Trigger 316063, is IGR J08408-4503
  23. GRB 080703: Swift-XRT refined analysis
  24. GRB 080702B: Swift XRT and UVOT observations
  25. GRB 080702A: Swift-XRT Team refined analysis
  26. GRB 080625:Swift-XRT detection of the afterglow
  27. Swift trigger 314975 is not a GRB
  28. GRB 080613A: Swift-XRT detection of the afterglow
  29. GRB 080613B - NOT optical and IR nondetections
  30. Swift observations of BAT Slew Survey event (Trigger=010)
  31. GRB 080603A: final Swift-XRT observations.
  32. GRB 080607: Swift-XRT refined analysis
  33. GRB 080607 - PAIRITEL NIR detection
  34. GRB 080605: Swift-XRT refined analysis
  35. GRB 080603B: PAIRITEL infrared detection
  36. GRB 080603A: PAIRITEL infrared detection
  37. GRB 080603A: Swift-XRT detection of the afterglow
  38. SGR 1627-41: Chandra/RXTE/Swift Observations Scheduled
  39. GRB 080602: Swift-XRT refined analysis
  40. Swift analysis of BAT Slew Survey event (Trigger=009)
  41. Reactivation of SGR 1627-41
  42. GRB 080524: Swift XRT and UVOT analysis
  43. GRB 080514B: second epoch Swift XRT data confirms the X-ray afterglow
  44. GRB 080517: Swift-XRT refined analysis
  45. GRB 080516: Swift-XRT Team refined analysis
  46. GRB 080514B: Swift-XRT analysis
  47. GRB 080507: Swift XRT analysis confirms the X-ray afterglow
  48. GRB 080503: Chandra Observation of X-ray Rebrightening or Flattening
  49. GRB 080507: Swift-XRT position of a possible afterglow
  50. GRB 080506: Swift XRT refined analysis
  51. GRB 080506: Optical observation with KANATA/TRISPEC
  52. GRB080503 XRT refined analysis
  53. GRB 080411: Continued Swift Monitoring
  54. GRB 080430: Swift-XRT refined analysis
  55. GRB 080426: Swift-XRT refined analysis
  56. Possible GRB 080315: XRT non-detection of afterglow
  57. Swift XRT and UVOT observations of GRB080414
  58. GRB 080413B: Swift XRT refined analysis
  59. GRB 080413A: Swift-XRT refined analysis
  60. GRB 080411: Swift-XRT Refined Analysis
  61. GRB 080409: Swift XRT refined analysis
  62. GRB 080408: Swift-XRT position of a possible afterglow
  63. GRB 080319B: Potential Jet Break Observed by Swift-XRT and UVOT
  64. GRB080330: Swift XRT refined analysis
  65. GRB 080328: Swift XRT refined analysis
  66. GRB 080325: Subaru detection of NIR afterglow candidate
  67. GRB080325: XRT Refined Analysis
  68. GRB 080319D: Swift XRT refined analysis
  69. GRB 080319B: Swift-XRT Team Refined Analysis
  70. Swift trigger 306323: Swift-BAT/XRT refined analysis
  71. GRB 080310: Swift/UVOT Refined Analysis
  72. GRB 080307: Swift-XRT Team refined analysis
  73. Swift UVOT observations of GRB080229B
  74. GRB080229B: Swift XRT afterglow observation
  75. GRB080229: Swift XRT refined analysis
  76. ESO optical and NIR observations of GRB 080218B
  77. GRB 080218B: Swift-XRT refined analysis
  78. GRB 080212: Swift-XRT Team refined analysis
  79. GRB 080207: Swift-XRT Refined Analysis
  80. GRB 080205: Swift XRT refined analysis
  81. GRB 080130: further Swift XRT observations confirm fading source
  82. GRB 080129: Swift-XRT refined analysis
  83. GRB 080121: Upper limit on X-ray afterglow
  84. SNe 2008D and 2007uy: Chandra Detections
  85. GRB 080123: Swift-XRT refined analysis
  86. GRB 080120: Swift-XRT refined analysis
  87. GRB080120: Swift XRT position
  88. Swift observations of the X-ray transient in NGC 2770 (aka SN2008D)
  89. Refined Swift-XRT analysis of the transient in NGC 2770
  90. GRB 071122 Swift-XRT refined analysis
  91. GRB 071117: Swift-XRT revised position
  92. Swift XRT follow-up observations of GRB071008
  93. GRB071118: Swift XRT refined analysis
  94. GRB 071117: Swift-XRT refined analysis
  95. GRB 071112C: Optical and NIR data observed with KANATA
  96. GRB 071112C: Swift XRT refined analysis
  97. GRB 071112B: Swift-XRT preliminary analysis
  98. Swift XRT follow-up observations of GRB071028B
  99. GRB 071109: further Swift-XRT analysis
  100. GRB 071109: Swift-XRT possible X-ray counterpart

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