Skip to main content
End of Swift Science Operations, CHIME Notices Unavailable During Upgrade. 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"

28251 results found.

  1. GRB 121011A: NOT optical observations
  2. GRB 121011A: optical observations
  3. GRB 121011A: MASTER-Net bell light curve
  4. GRB 121011A: TNG optical observations
  5. GRB 121011A: Enhanced Swift-XRT position
  6. GRB 121011A: MITSuME Okayama Optical Observation
  7. GRB 121011A: Swift detection of a burst with optical afterglow
  8. Trigger 535747: Swift detection of an outburst from SGR1806-20
  9. Trigger 535733: Swift possible detection of SAX J1828.5-1037
  10. GRB 120927A: optical upper limit
  11. GRB 120804A: Late-time Chandra observation
  12. GRB 121001A: GROND Afterglow Confirmation
  13. GRB 121001A: Swift/UVOT Upper Limits
  14. GRB 121001A: Swift-XRT refined Analysis
  15. GRB 121001A: Enhanced Swift-XRT Position
  16. Swift Trigger 535026: Optical decay confirmation with IAC80 and BOOTES-2/TELMA.
  17. GRB 121001A: possible optical counterpart
  18. Swift Trigger 535026: ROTSE-III Optical Limits
  19. Swift Trigger 535026: Galactic Transient or possible GRB
  20. GRB 120927A: Swift/UVOT Upper Limits
  21. GRB 120927A: GROND upper limits
  22. GRB 120927A: Swift-XRT refined Analysis
  23. GRB 120927A: Enhanced Swift-XRT position
  24. GRB 120923A: JHK Observation
  25. GRB 120927A: Swift detection of a burst
  26. Further Swift-XRT observations of the GRB 120919A field.
  27. GRB 120921A: Fermi GBM detection of its 1000th GRB
  28. GRB 120923A: RAPTOR Early Afterglow Limits
  29. GRB 120923A: MITSuME Okayama Optical upper limits
  30. GRB 120916A Suzaku WAM observation of the prompt emission
  31. GRB 120923A: CARMA Observations
  32. GRB 120923A: EVLA Observations
  33. GRB 120923A: Swift-XRT refined Analysis
  34. GRB 120922A: GROND photometric redshift
  35. GRB 120922A: Fermi GBM detection
  36. GRB 120922A: Swift/UVOT Detection
  37. GRB 120923A: Swift/UVOT Upper Limit
  38. GRB 120922A: Swift-XRT refined Analysis
  39. GRB 120922A: Swift/UVOT Observations
  40. GRB 120923A: Gemini afterglow detection, high-z candidate
  41. GRB 120923A: Enhanced Swift-XRT position
  42. GRB 120922A: Enhanced Swift-XRT position
  43. GRB 120923A: TAROT La Silla observatory optical observations
  44. GRB 120923A: Swift detection of a burst
  45. GRB 120922A: GROND afterglow candidate
  46. GRB 120922A: Prompt enhanced Swift-XRT position
  47. GRB 120922A: Swift detection of a burst
  48. GRB 120919A: Swift/UVOT Upper Limits
  49. GRB 120919A: Swift-XRT observations
  50. Konus-Wind observation of GRB 120919B
  51. Konus-Wind observation of GRB 120919A
  52. IPN Triangulation of long GRB 120919A
  53. GRB 120919A: Fermi GBM detection
  54. Swift trigger 534017 was not an astrophysical event
  55. Konus-Wind observation of GRB 120916A
  56. Swift Trigger 534017 is probably not real.
  57. GRB 120918A: Swift detection of a burst
  58. IPN Triangulation of long GRB 120916A
  59. GRB 120916A: Fermi-LAT detection of a burst
  60. Swift Trigger 533836 is a new Galactic transient
  61. GRB 120913B: FRAM early follow up and detection
  62. GRB 120913B: REM NIR early time detection
  63. GRB 120913B: TAROT La Silla observatory optical photometry
  64. GRB 120913B: TAROT La Silla observatory optical detection
  65. GRB 120913B: Swift detection of a burst
  66. GRB 120913A: Swift detection of a burst
  67. GRB 120907A: optical observations of ISON-Kislovodsk
  68. GRB 120911A: optical upper limit CrAO
  69. GRB 120911A: optical upper limit ISON-NM
  70. Konus-Wind observation of GRB 120911B
  71. GRB 120911B: Fermi-LAT detection of a burst
  72. GRB120911A: MITSuME Okayama Optical upper limits
  73. GRB 120911A: Swift/UVOT Upper Limits
  74. GRB 120911A: Swift-XRT refined Analysis
  75. GRB 120911A: Enhanced Swift-XRT position
  76. GRB 120911A: Faulkes Telescope North observations
  77. GRB 120911A: Swift-XRT observations
  78. GRB 120911A: Swift detection of a burst
  79. GRB 120907A: SMA upper limits
  80. GRB 120908A: Fermi GBM detection
  81. GRB 120908A: Swift Observations
  82. GRB 120909A: Pi of the Sky upper limits
  83. GRB 120909A: Swift/UVOT Detection
  84. GRB 120909A: Swift-XRT refined Analysis
  85. GRB 120909A: Enhanced Swift-XRT position
  86. GRB 120908A: MAXI/GSC detection
  87. GRB 120909A: GROND detection of the afterglow
  88. GRB 120909A: Swift detection of a burst
  89. GRB 120907A: EVLA observations
  90. GRB 120907A: Swift/UVOT Detection
  91. GRB 120907A: Swift-XRT refined Analysis
  92. GRB 120907A: Spectroscopy from OSIRIS/GTC
  93. GRB 120907A: Enhanced Swift-XRT position
  94. GRB 120907A: Fermi GBM detection
  95. GRB 120907A: NOT optical observations
  96. GRB 120907A: ROTSE-III Optical Limits
  97. GRB 120907A: Swift detection of a burst with optical counterpart
  98. XMM observations of the short GRB120804A
  99. GRB 120819A: optical upper limit
  100. GRB 120802A: optical observations in CrAO

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