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"

27947 results found.

  1. GRB 121001A: GROND Afterglow Confirmation
  2. GRB 121001A: Swift/UVOT Upper Limits
  3. GRB 121001A: Swift-XRT refined Analysis
  4. GRB 121001A: Enhanced Swift-XRT Position
  5. Swift Trigger 535026 is GRB 121001A: Swift-BAT refined analysis
  6. Swift Trigger 535026: Optical decay confirmation with IAC80 and BOOTES-2/TELMA.
  7. GRB 121001A: MASTER optical observations
  8. GRB 121001A: possible optical counterpart
  9. Swift Trigger 535026: ROTSE-III Optical Limits
  10. Swift Trigger 535026: Galactic Transient or possible GRB
  11. GRB 120927A: Swift/UVOT Upper Limits
  12. GRB 120927A, Swift-BAT refined analysis
  13. GRB 120927A: GROND upper limits
  14. GRB 120927A: Swift-XRT refined Analysis
  15. GRB 120927A: Enhanced Swift-XRT position
  16. GRB 120923A: JHK Observation
  17. GRB 120927A: Swift detection of a burst
  18. Further Swift-XRT observations of the GRB 120919A field.
  19. GRB 120923A: optical upper limit
  20. GRB 120921A: Fermi GBM detection of its 1000th GRB
  21. GRB 120923A: RAPTOR Early Afterglow Limits
  22. GRB 120916A Suzaku WAM observation of the prompt emission
  23. GRB 120923A: RAPTOR Limits During Gamma-Ray Emitting Interval
  24. GRB 120923A: CARMA Observations
  25. GRB 120923A: EVLA Observations
  26. GRB 120923A: Swift-XRT refined Analysis
  27. GRB 120923A: GROND Upper limits
  28. GRB 120922A: GROND photometric redshift
  29. GRB 120922A: Fermi GBM detection
  30. GRB 120922A: Swift/UVOT Detection
  31. GRB 120923A: Swift-BAT refined analysis
  32. GRB 120922A: Swift-BAT refined analysis
  33. GRB 120923A: Swift/UVOT Upper Limit
  34. GRB 120922A: Swift-XRT refined Analysis
  35. GRB 120922A: Swift/UVOT Observations
  36. GRB 120923A: Gemini afterglow detection, high-z candidate
  37. GRB 120923A: Enhanced Swift-XRT position
  38. GRB 120922A: Enhanced Swift-XRT position
  39. GRB 120922A: TAROT La Silla observatory optical observations
  40. GRB 120923A: TAROT La Silla observatory optical observations
  41. GRB 120923A: ROTSE-III Optical Limits
  42. GRB 120923A: Swift detection of a burst
  43. GRB 120922A: GROND afterglow candidate
  44. GRB 120922A: Prompt enhanced Swift-XRT position
  45. GRB 120922A: Swift detection of a burst
  46. GRB 120919A: Swift/UVOT Upper Limits
  47. GRB 120919A: Swift-XRT observations
  48. Konus-Wind observation of GRB 120919B
  49. Konus-Wind observation of GRB 120919A
  50. IPN Triangulation of long GRB 120919A
  51. GRB 120919A: Fermi GBM detection
  52. GRB 120918A: Swift-BAT refined analysis
  53. Swift trigger 534017 was not an astrophysical event
  54. Konus-Wind observation of GRB 120916A
  55. Swift Trigger 534017 is probably not real.
  56. GRB 120918A: Swift detection of a burst
  57. IPN Triangulation of long GRB 120916A
  58. GRB 120916A: Fermi-LAT detection of a burst
  59. Swift Transient Swift J174510.8-262411: Swift-BAT refined analysis
  60. Swift Trigger 533836 is a new Galactic transient
  61. GRB 120913B: Fermi GBM observation
  62. GRB 120913B: Swift-BAT refined analysis
  63. GRB 120913A: Fermi GBM observation
  64. GRB 120913B: FRAM early follow up and detection
  65. GRB 120913A: Swift-BAT refined analysis
  66. GRB 120913B: REM NIR early time detection
  67. Continued Skynet/PROMPT observations of GRB120913B
  68. GRB 120913B: TAROT La Silla observatory optical detection
  69. Skynet/PROMPT observations of GRB120913B
  70. GRB 120913B: Swift detection of a burst
  71. GRB 120913A: Swift detection of a burst
  72. GRB 120911A: optical upper limit CrAO
  73. GRB 120911A: optical upper limit ISON-NM
  74. Konus-Wind observation of GRB 120911B
  75. GRB 120911B: Fermi-LAT detection of a burst
  76. GRB 120911A: Fermi GBM observation
  77. GRB 120911A: Fermi/LAT upper limit
  78. GRB 120911A: Swift/UVOT Upper Limits
  79. GRB 120911A: Swift-XRT refined Analysis
  80. GRB 120911A: Swift-BAT refined analysis
  81. GRB 120911A: Enhanced Swift-XRT position
  82. GRB 120911A: Swift-XRT observations
  83. GRB 120911A: ROTSE-III Optical Limits
  84. GRB 120911A: Swift detection of a burst
  85. GRB 120907A: SMA upper limits
  86. GRB 120908A and GRB 120909A : Fermi/LAT upper limit
  87. GRB 120908A: Fermi GBM detection
  88. GRB 120908A: Swift Observations
  89. GRB 120909A: TAROT La Silla observatory optical observations
  90. GRB 120909A: Pi of the Sky upper limits
  91. GRB 120909A: Fermi GBM observation
  92. Konus-Wind observation of GRB 120909A
  93. GRB 120909A: Swift/UVOT Detection
  94. GRB 120909A: Swift-XRT refined Analysis
  95. GRB 120909A: Swift-BAT refined analysis
  96. GRB 120909A: Enhanced Swift-XRT position
  97. GRB 120908A: MAXI/GSC detection
  98. GRB 120909A: GROND detection of the afterglow
  99. Skynet/PROMPT Observations of GRB120909A
  100. GRB 120909A: Swift detection of a burst

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