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"

27919 results found.

  1. GRB 091117: Swift-XRT late time observations
  2. GRB 091221 Swift-BAT refined analysis
  3. GRB091221: Swift/UVOT refined analysis, correction.
  4. GRB 091221: Swift/UVOT refined analysis
  5. GRB 091221: Swift-XRT refined analysis
  6. GRB 091221: Enhanced Swift-XRT position
  7. GRB 091221: UVOT Confirmation of an Optical Afterglow
  8. GRB 091221: ROTSE-III Detection of Optical Counterpart
  9. GRB 091221: Swift detection of a burst
  10. Swift trigger 379449 (possible GRB) is not a burst
  11. Trigger 379449: Swift detection of a possible burst
  12. GRB 091208A: Suzaku WAM observation of the prompt emission
  13. Konus-Wind observation of GRB 091208A
  14. GRB091208A: Swift/UVOT refined analysis
  15. GRB 091208B: optical observations
  16. GRB 091208B: GROND observations
  17. GRB 091208A: Swift-XRT observations
  18. GRB 091208B: Swift-XRT refined analysis
  19. GRB091208B: Swift/UVOT refined analysis
  20. GRB 091208B: Fermi GBM observation
  21. GRB 091208B, Swift-BAT refined analysis
  22. GRB 091208A Swift-BAT refined analysis
  23. GRB 091208B: Faulkes Telescope North and South Optical Afterglow
  24. GRB 091208A, RIMOTS optical upper limits
  25. GRB 091208B: Enhanced Swift-XRT position
  26. GRB 091208B, RIMOTS optical upper limits
  27. GRB 091208B: Swift detection of a burst with an optical afterglow
  28. GRB 091208B: BOOTES-3 optical afterglow
  29. GRB 091208: ROTSE-III Optical Limits
  30. GRB 091208: Swift detection of a burst
  31. GRB091127: Continuing Swift/UVOT Observations
  32. GRB091202: Swift-XRT refined analysis
  33. GRB 091202: Swift/UVOT Upper Limits
  34. GRB 091202 - UVOT-enhanced XRT position
  35. GRB 091127: Zadko Telescope Observations
  36. GRB 091117: Chandra Observations
  37. Short X-ray Transient Detection by MAXI/GSC
  38. GRB 091123: Fermi GBM detection of a very long burst
  39. GRB 091126B: Fermi GBM detection
  40. GRB 091127: Suzaku WAM observation of the prompt emission
  41. GRB 091126: Fermi GBM detection
  42. GRB 091130B: Swift-XRT team refined analysis
  43. GRB 091130B: Swift-BAT refined analysis
  44. GRB 091130B: Swift/UVOT Upper Limits
  45. GRB 091127: Skynet/PROMPT Observations of Fading
  46. GRB 091130B: Enhanced Swift-XRT position
  47. Swift trigger 377436 (possible GRB 091130A) is not a burst
  48. GRB 091130B: MASTER observations
  49. GRB 091130B: SDSS galaxy at XRT location
  50. GRB 091130B: Swift detection of a burst
  51. GRB 091130: Swift detection of a possible burst
  52. GRB 091127: Radio observations
  53. GRB 091128: Fermi GBM detection
  54. Konus-Wind observation of GRB 091127
  55. GRB 091127: TAROT La Silla observatory optical observations
  56. GRB 091127: optical observations
  57. GRB 091127: Fermi GBM detection
  58. GRB 091127: Gemini-N redshift
  59. GRB 091127: Swift-XRT afterglow detection and analysis
  60. GRB 091127: TAROT La Silla observatory optical decay
  61. GRB 091127: Swift/UVOT observations
  62. GRB 091127: Swift-BAT refined analysis
  63. GRB 091127 : GROND observations
  64. GRB 091127: REM NIR afterglow detection
  65. GRB 091127: Swift/UVOT Detection of an Optical Afterglow
  66. GRB 091127: Liverpool Telescope afterglow candidate
  67. GRB 091127: Swift detection of a burst
  68. GRB 091120: MAXI GSC detection
  69. GRB 091117A: Suzaku WAM observation of the prompt emission
  70. GRB 091117A: Swift/UVOT followup observations
  71. GRB 091117: Swift-XRT observations
  72. GRB 091117 BAT refined analysis
  73. GRB 091117: Evidence for Variability of XRT Source #1
  74. GRB 091117: Swift XRT refined analysis
  75. GRB 091117: Gemini-North spectroscopy of DSS galaxy
  76. Konus-Wind observations of GRB 091117A
  77. GRB 091117: XRT source coincident with a DSS galaxy
  78. GRB 091117A Detected in ground analysis of BAT data and IPN triangulation
  79. GRB 091112: Suzaku WAM observation of the prompt emission
  80. GRB 091102A: Suzaku WAM observation of the prompt emission
  81. GRB 091109B: Suzaku WAM observation of the prompt emission
  82. GRB091111: Swift XRT refined analysis
  83. GRB 091112: Swift-BAT refined analysis
  84. GRB 091112: Fermi GBM observation
  85. GRB 091031: Fermi LAT detection of a faint burst
  86. GRB 091112: Swift detection of a possible burst
  87. GRB 091109B: Swift/UVOT Upper Limits
  88. GRB 091109B: Swift-XRT Team refined analysis
  89. GRB 091109B: Swift-BAT refined analysis
  90. GRB 091109B: Enhanced Swift-XRT position
  91. GRB 091109B: Optical limits from Watcher
  92. GRB 091109B: ROTSE-III Optical Limits
  93. GRB 091109B: Swift detection of a short burst
  94. GRB091109: Correction to GCN 10139
  95. GRB 091030: Fermi GBM detection
  96. GRB 091109: Swift-XRT refined analysis
  97. GRB 091109: BOOTES-3 observations
  98. GRB 091109: Swift/UVOT observations
  99. GRB 091109: Swift-BAT refined analysis
  100. GRB 091109: Enhanced Swift-XRT position

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