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"

36398 results found.

  1. IPN Triangulation of GRB 120709A
  2. GRB 120712A: Swift/UVOT Detection
  3. GRB 120712A: VLT/Xshooter redshift
  4. GRB 120712A: Swift-XRT refined Analysis
  5. GRB 120712A Gemini-S redshift
  6. GRB 120712A: GROND Detection of the Optical/NIR Afterglow Candidate and photo-z
  7. GRB 120712A: Enhanced Swift-XRT position
  8. GRB 120712A: Swift-BAT refined analysis
  9. GRB 120712A: Swift detection of a burst with optical afterglow
  10. GRB 120711B: Swift-XRT refined Analysis
  11. GRB 120711A: Fermi LAT Detection
  12. GRB 120711A: ATCA 34GHz upper limit
  13. GRB 120711B: Swift-BAT refined analysis
  14. GRB 120711B: Swift/UVOT Upper Limits
  15. GRB 120711A: Swift/UVOT Observations
  16. GRB 120709A: Swift/UVOT Observations
  17. Konus-Wind observation of GRB 120711A
  18. GRB 120711A: Fermi LAT detection
  19. GRB 120711A: MASTER early OT detection
  20. GRB 120711A: Swift-XRT observations
  21. GRB 120711A Gemini-S likely redshift
  22. Konus-Wind observation of GRB 120709A
  23. GRB 120711A: REM NIR early time detection
  24. GRB 120711A: GROND photometric redshift
  25. GRB 120711A: Fermi GBM observation
  26. GRB 120711A: MAXI/GSC detection
  27. GRB 120711A: a possible X-ray transient
  28. GRB 120711A: an bright long GRB detected with INTEGRAL
  29. Continued Skynet/PROMPT observations of GRB120711A
  30. GRB 120711A: ROTSE-III confirm of Optical Counterpart
  31. Swift detection of GRB 120711B or a new Galactic transient
  32. GRB 120709A: Fermi GBM detection
  33. GRB 120709A: Swift-XRT observations
  34. GRB 120709A: Matched filter analysis of Fermi-LAT data
  35. GRB 120709A: optical afterglow limits
  36. Konus-Wind observation of GRB 120707A
  37. IPN Triangulation of GRB 120707A
  38. GRB 120709A: Fermi-LAT Detection
  39. GRB 120707A: Fermi GBM Detection of a Bright Burst
  40. GRB 120624B: mm detection at PdBI
  41. GRB 120703A: SMARTS optical/IR observations
  42. GRB 120703A: Swift/UVOT Detection
  43. GRB 120703A: Fermi GBM detection
  44. GRB 120703A: Swift-XRT refined Analysis
  45. GRB 120703A: Enhanced Swift-XRT position
  46. GRB 120703A: Swift-BAT refined analysis
  47. GRB 120624B Suzaku WAM observation of the prompt emission
  48. Konus-Wind observation of GRB 120703A
  49. GRB 120703A: NOT optical observation
  50. GRB 120701A: Swift/UVOT Detection
  51. GRB 120701A: GROND detection of the afterglow
  52. GRB 120703A: Swift detection of a bright burst with an optical afterglow
  53. GRB 120701A: Swift-XRT afterglow detection and analysis
  54. GRB 120630A: Swift-BAT/-XRT/-UVOT refined analysis
  55. GRB 120701A: Swift-BAT refined analysis
  56. GRB 120630A: NOT optical source within the XRT error circle
  57. Swift Trigger 525554 is probably not a GRB
  58. GRB120624B: Chandra observations and afterglow detection
  59. Fermi Gamma-ray Burst Monitor trigger 120628.973 is not a GRB
  60. GRB 120624B Further Swift-XRT analysis
  61. GRB 120624B: Swift/UVOT Upper Limits
  62. GRB 120624B: Further analysis of the HAWKI observations
  63. GRB 120624B: Swift-XRT observations
  64. GRB 120624B: GROND upper limits
  65. GRB 120624B: NIR counterpart candidate from HAWKI
  66. GRB 120624B: Discussion of Fermi and Swift measurements and future Swift observations
  67. GRB 120624B: NOT optical upper limit
  68. GRB 120624B: optical observations
  69. GRB 120624B, Swift-BAT refined analysis
  70. GRB 120624B: Fermi GBM fluence and peak photon flux correction
  71. Konus-Wind observation of GRB 120624B
  72. GRB 120624B: Swift detection of a burst
  73. GRB 120624A: Fermi GBM observation
  74. GRB 120624B: Fermi-LAT Detection
  75. Konus-Wind observation of GRB 120624A
  76. GRB 120624B: Fermi GBM detection
  77. IPN Triangulation of GRB 120624A (short/intense)
  78. GRB 120622A: MAXI/GSC detection
  79. Swift trigger 524642 / SwJ1910.2-0546
  80. GRB 120602A: Suzaku WAM observation of the prompt emission
  81. Konus-Wind observation of GRB 120617A
  82. IPN Triangulation of GRB 120617A (short/intense)
  83. Konus-Wind observation of GRB 120602A
  84. IPN Triangulation of GRB 120602A (long/very bright)
  85. GRB 120614A: MAXI/GSC detection of a burst
  86. GRB 120612A: optical observations
  87. GRB 120612A: Swift/UVOT observations
  88. GRB 120612A: Swift-XRT refined Analysis
  89. GRB 120612A: Swift-BAT refined analysis
  90. GRB 120612A: Enhanced Swift-XRT position
  91. GRB 120612A: BOOTES-3 optical upper limit
  92. GRB 120612A: Swift detection of a burst
  93. GRB 120603A: Suzaku WAM observation of the prompt emission
  94. Konus-Wind observation of GRB 120603A
  95. IPN Triangulation of short GRB 120603A
  96. Fermi GBM trigger 120602.539 is not a GRB
  97. Konus-Wind observation of GRB 120528B
  98. GRB 120519A: Suzaku WAM observation of the prompt emission
  99. GRB 120528C: MAXI/GSC detection
  100. GRB 120521C redshift estimate

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