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"

28230 results found.

  1. Radio observation of GRB 080229b with ATCA
  2. GRB 081024B: VLA radio observation
  3. GRB 081029: UVOT Detection of the Optical Afterglow
  4. GRB 081029: Swift-BAT refined analysis
  5. GRB081029: Swift XRT refined analysis
  6. GRB 081025: Suzaku WAM observation of the prompt emission
  7. GRB 081029: Enhanced Swift-XRT position
  8. GRB 081028: GROND Confirmation of the Optical/NIR Afterglow
  9. GRB 081029: REM observations
  10. Radio observation of GRB 080303 with ATCA
  11. Radio observation of GRB 080411 with ATCA
  12. GRB 081029: GROND Detection of the Optical/NIR Afterglow
  13. GRB 081029: ROTSE-III Detection of Optical Counterpart
  14. GRB 081028B: Fermi GBM detection
  15. GRB 081021: Fermi GBM detection
  16. Swift UVOT observations of GRB081028
  17. GRB 081028: Swift-XRT refined analysis
  18. GRB 081028, Swift-BAT refined analysis
  19. GRB 081028: Enhanced Swift-XRT position
  20. GRB 081028: TAROT Calern observatory optical observations
  21. GRB 081028: optical observations at the NOT
  22. GRB 081028: GROND Detection of the Optical/NIR Afterglow Candidate
  23. Fermi LAT/GBM short-hard GRB 081024B: Possible TLS Afterglow (Corrected)
  24. Fermi LAT/GBM short-hard GRB 081024B: Possible TLS Afterglow
  25. GRB 081028: Swift detection of a burst
  26. GRB 081024: No radio detection with the VLA
  27. GRB081025: RTT150 optical observations
  28. GRB081024B: P200 Observations
  29. GRB 081024B: Swift-XRT further observations
  30. GRB 081025 BAT refined analysis
  31. Swift UVOT observations of GRB081024B
  32. Konus-Wind observation of GRB 081025
  33. GRB 081025: Swift-XRT position
  34. GRB 081024B: Swift-XRT observations
  35. GRB 081025: Burst detection from Swift-BAT slew data
  36. GRB 081024: Swift-XRT refined analysis
  37. GRB 081024, Swift-BAT refined analysis
  38. GRB 081024: Enhanced Swift-XRT position
  39. GRB 081024: Faulkes Telescope North optical observations
  40. GRB 081024A: ROTSE-III Optical Limits
  41. GRB 081024: Swift detection of a burst
  42. GRB 081022, Swift-BAT refined analysis
  43. GRB 081016A: Swift-XRT refined analysis
  44. Swift detection of a possible burst (trigger 332287)
  45. GRB 081017, Swift-BAT refined analysis
  46. GRB 081017: REM early observations
  47. GRB 081016B, Swift-BAT refined analysis
  48. GRB 081011: Swift XRT refined analysis
  49. GRB 081016B: Swift-XRT Team refined Analysis
  50. GRB 081016B: Enhanced Swift-XRT position
  51. GRB 081016B: ROTSE-III Optical Limits
  52. GRB 081016B: Swift detection of a burst
  53. GRB 081011: Enhanced Swift-XRT position
  54. Swift detection of flare on CC Eri
  55. GRB 081016: A long GRB discovered by INTEGRAL
  56. Trigger 331721 Due to Swift startracker loss-of-lock
  57. Detection of flare star Algol in Swift-BAT slew data
  58. GRB 081009: Fermi GBM detection
  59. GRB 081012: GROND upper limits
  60. Swift-BAT triggered on the flare star Algol
  61. GRB 081012: Fermi GBM detection
  62. GRB 081007 and GRB 081007B: Fermi GBM detection
  63. GRB 080430: optical observations
  64. GRB 081012: Observations from NOT
  65. GRB 081012: Swift/XRT detection
  66. GRB 081012, Swift-BAT refined analysis
  67. GRB081011: UVOT detection of an optical afterglow
  68. GRB 081011: Swift/XRT detection
  69. GRB 081011, Swift-BAT refined analysis
  70. GRB 081008, SMARTS optical/IR afterglow observations
  71. GRB 081011: Swift detection of a burst
  72. GRB 081007: Radio Detection
  73. GRB 081008, Swift-BAT refined analysis
  74. GRB 081008: Swift-XRT Refined Analysis
  75. GRB081008: Swift/UVOT observations
  76. GRB 081008: Enhanced Swift-XRT position
  77. GRB 081008: Swift detection of a burst with optical afterglow
  78. GRB 081008: ROTSE-III Detection of Optical Counterpart
  79. GRB081006B: Fermi GBM detection
  80. GRB081006: Fermi GBM detection
  81. GRB081007: Swift/UVOT Observations
  82. GRB 081007, SMARTS optical afterglow observations
  83. GRB 081007, Swift-BAT refined analysis
  84. GRB 081007: Early RAPTOR measurements of optical counterpart
  85. GRB 081007: Swift-XRT Team refined analysis
  86. GRB 081007: Enhanced Swift-XRT position
  87. GRB 081007, Faulkes Telescope North optical observations
  88. GRB 081007: REM NIR and optical counterpart
  89. GRB 081007: Swift detection of a burst with optical afterglow
  90. GRB081003C: GLAST Burst Monitor detection
  91. GRB 081003B: TAROT Calern observatory optical observations
  92. AXP 1E 1547.0-5408: Swift/UVOT Upper Limits
  93. GRB 081003B: Swift-XRT upper limit
  94. GRB 081003A: OSN optical observations
  95. GRB 081001: Further observations from OSN
  96. AXP 1E1547.0-5408: Swift-XRT Team refined analysis
  97. GRB 081003A: Swift-XRT Team position and analysis
  98. GRB 081003B: a long GRB detected with INTEGRAL
  99. GRB 080928: Fermi GBM detection
  100. GRB 081003: A long GRB discovered by INTEGRAL

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