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"

5164 results found.

  1. GRB 100418A: host galaxy detection in the SDSS
  2. GRB 100413A: Swift-XRT Refined Analysis
  3. IPN triangulation of GRB100324B
  4. Short X-ray Transient detected by MAXI/GSC
  5. GRB 100322A: Suzaku WAM observation of the prompt emission
  6. GRB 100324A: GROND observations
  7. GRB 100324A found in ground analysis of BAT data
  8. GRB 100316D: Further Gemini observations
  9. GRB 100316C: Swift-XRT team refined analysis
  10. GRB 100316A: Swift-XRT refined analysis
  11. GRB 100305A: Swift-XRT refined analysis
  12. GRB 100305A: Enhanced Swift-XRT position
  13. GRB 100305A: Gemini-N OT candidate
  14. GRB 100305A: Swift detection of a burst
  15. GRB 100302A: Swift-XRT refined analysis
  16. GRB 100224B: Fermi GBM detection
  17. GRB 100219A: GAO 150cm telescope Optical Observation
  18. GRB 100219A: XRT refined analysis
  19. GRB 100213B: Swift XRT refined analysis
  20. GRB 100206A: Swift-XRT refined analysis
  21. Short X-ray Transient detected by MAXI/GSC
  22. GRB 100119A: Suzaku WAM observation of the prompt emission
  23. GRB100111A: Swift-XRT refined analysis
  24. GRB 091221: Swift-XRT refined analysis
  25. GRB 091208B: Swift-XRT refined analysis
  26. Short X-ray Transient Detection by MAXI/GSC
  27. GRB 091130B: Swift-XRT team refined analysis
  28. GRB 091127: Swift-XRT afterglow detection and analysis
  29. GRB 091127 : GROND observations
  30. GRB 091117: 2nd epoch of Magellan optical observations
  31. GRB091117: Gemini South Observations
  32. GRB 091112: Suzaku WAM observation of the prompt emission
  33. GRB 091109B: Suzaku WAM observation of the prompt emission
  34. GRB 091109B: Swift-XRT Team refined analysis
  35. GRB 091109: Swift-XRT refined analysis
  36. GRB 091104: Swift XRT Refined Analysis
  37. GRB 091104: Enhanced Swift-XRT position
  38. GRB 091104: Swift detection of a burst
  39. GRB 091024: optical observations
  40. GRB 091029: Swift XRT refined analysis
  41. GRB 091024: Keck/LRIS Spectroscopy
  42. GRB 091026: Swift-XRT refined analysis
  43. GRB 091024: Fermi GBM Observations
  44. GRB 091024: Swift-XRT team refined analysis
  45. GRB 091024: Xinglong TNT optical observation
  46. GRB 091024: GRAS004 optical observations
  47. GRB 091020: Additional Lick observations
  48. GRB 091020: Swift-XRT refined analysis
  49. GRB 090812: Skynet/PROMPT and GORT Observations
  50. GRB 091003A: Suzaku WAM observation of the prompt emission
  51. GRB 090929B: Swift-XRT refined analysis
  52. GRB 090927: Swift XRT refined analysis
  53. GRB 090926B: Swift XRT refined analysis
  54. GRB 090926A: Skynet/PROMPT Discovery of the Optical Afterglow
  55. GRB 090823: Swift XRT confirmation of the X-ray afterglow
  56. GRB 090902B: Suzaku WAM observation of the prompt emission
  57. GRB 090904B: Fermi GBM detection
  58. GRB 090904A: Swift-XRT refined analysis
  59. GRB 090904B: Swift XRT Refined Analysis
  60. GRB 090904B: Swift detection of a burst
  61. GRB 090831C: Swift XRT Refined Analysis
  62. GRB 090831: MAXI GSC detection
  63. GRB 090823: Swift XRT possible detection of the X-ray afterglow
  64. GRB 090817: aphotometry of USNO-B1.0 341-0096763
  65. GRB 090815B: Fermi GBM detection
  66. GRB 090814B: Swift-XRT detection of a possible afterglow.
  67. GRB 090814A: Swift-XRT Team Refined Analysis
  68. GRB 090813: Swift-XRT refined analysis
  69. GRB 090812: Swift XRT refined analysis
  70. GRB 090809: Swift-XRT refined analysis
  71. GRB 090807: Liverpool Telescope observations
  72. GRB 090807: Swift-XRT refined analysis
  73. Swift trigger 358760 is probably a noise event
  74. GRB 090727: Swift-XRT refined analysis
  75. GRB 090715B: Late-time Lick 3m observations
  76. GRB 090726: Swift-XRT Team refined analysis
  77. GRB 090720: Fermi GBM detection
  78. GRB 090715B: Swift XRT Refined Analysis
  79. GRB 090621B: MTM-500 optical observations
  80. GRB 090709B: Fermi GBM detection
  81. GRB 090709A: Quasiperiodic variations in the BAT light curve
  82. GRB 090709A: NOT optical observations
  83. GRB 090709A: Swift XRT Refined Analysis
  84. GRB 090529: CrAO optical upper limit
  85. GRB 090529: Mt.Terskol optical observations
  86. GRB 090630: Fermi GBM detection
  87. Konus-Wind observation of GRB 090626
  88. GRB 090625B: Swift-XRT refined analysis
  89. GRB 090625B: Swift observation of the INTEGRAL GRB 090625B
  90. GRB 090625: Fermi GBM detection
  91. GRB 090621B: Swift-XRT refined analysis
  92. GRB 090621: Swift-XRT Team refined analysis
  93. GRB 090621: Swift detection of a burst
  94. GRB090618: Swift-XRT team refined analysis
  95. GRB 090618: planned XMM-Newton observation
  96. GRB 090530: break in light curve
  97. GRB 090529: optical observations
  98. GRB 090529: TLS Afterglow Observations
  99. GRB090529: UVOT/Swift detection of a brightening optical afterglow
  100. GRB 090524: Fermi GBM detection

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