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"

24436 results found.

  1. GRB 061110A: Swift XRT refined analysis
  2. GRB 061110B: Swift/XRT position
  3. GRB 061110B : Liverpool Telescope Optical Afterglow Detection
  4. GRB 061110A, Swift-BAT refined analysis
  5. GRB 061110: ROTSE-III Optical Limits
  6. GRB 061109: optical observation
  7. GRB061028: MAGIC telescope GeV observation
  8. GRB 061028: Swift/XRT Astrometry Correction
  9. GRB 061004: Further VLT/NTT observations
  10. GRB 061028: Optical R passband observations
  11. GRB 061102B: Swift detection of a possible burst
  12. GRB 061102, Swift-BAT refined analysis
  13. GRB 061004: Swift/XRT Astrometry Correction
  14. GRB 060801: Swift/XRT Astrometry Correction
  15. GRB 061028, Swift-BAT refined analysis
  16. GRB 061027, Swift refined analysis of a possible burst
  17. GRB061025: Swift/UVOT observations
  18. GRB 061025: ROTSE-III Optical Limits
  19. GRB 061025: a long GRB detected by INTEGRAL
  20. Swift XRT boresight update
  21. GRB 061021 - VLT spectrum without lines
  22. GRB 061021: Swift/UVOT Observation
  23. GRB 061021, Swift-BAT refined analysis
  24. GRB060904b: optical observations
  25. GRB061019: optical observations
  26. GRB 061019: dust-scattered X-ray halo detected in Swift/XRT
  27. GRB 061019: SMARTS afterglow confirmation
  28. GRB061019: Swift XRT refined analysis
  29. GRB 061019, Swift-BAT refined analysis
  30. GRB061019: Swift/XRT position
  31. GRB 060825: GORT Observations
  32. GRB 061007: RHESSI Spectral Fit
  33. GRB 061007: Suzaku/WAM observation of the prompt emission
  34. Konus-Wind observation of GRB 061007
  35. GRB 060928: Confirmation of the X-ray afterglow detected by Swift
  36. GRB061007: Swift UVOT followup observations
  37. GRB 061006 : Suzaku/WAM observation of the prompt emission
  38. GRB 061007: Swift-BAT refined analysis
  39. GRB 061006: Swift/UVOT optical observations
  40. GRB 061007 - FTS early brightening and power law decay
  41. GRB 061007 - Faulkes Telescope South Afterglow Confirmation
  42. GRB 061007: ROTSE-III Detection of Optical Counterpart
  43. GRB 061006: Swift-BAT refined analysis of the short-hard burst
  44. GRB 061006: Swift-XRT Team Refined Analysis
  45. GRB 060930: near-IR afterglow candidate retraction
  46. GRB 061004: Swift-XRT Team Refined Analysis
  47. GRB 061004, Swift BAT refined analysis
  48. Konus-Wind observation of GRB 060928
  49. GRB 060928: Suzaku/WAM observation of the prompt emission
  50. GRB 060928: Swift observations
  51. GRB 060928: RHESSI Spectral Fit
  52. GRB 061002, Swift-BAT refined analysis
  53. GRB061002: MASTER-VWF-Kislovodsk observations
  54. GRB060930: Faulkes Telescope South observation
  55. GRB 060930: Xinglong TNT optical observations
  56. GRB 060929: Swift/UVOT Optical Observations
  57. GRB 060930: ROTSE-III Optical Limits
  58. GRB 060930: A long X-ray rich GRB detected by INTEGRAL
  59. GRB060929: Swift-XRT refined analysis.
  60. GRB 060929, Swift-BAT further refined analysis - late-time flare
  61. GRB 060929, Swift-BAT refined analysis
  62. GRB 060929: BART observation
  63. GRB 060929: MASTER-VWF-Kislovodsk observations
  64. GRB 060929: Swift detection of a burst
  65. GRB060908: optical observations
  66. GRB 060729: An update on the late-time Swift observations
  67. IBAS Alert n.3501: not a GRB
  68. IBAS Alert n.3500: not a GRB
  69. GRB060923C: optical limit
  70. GRB060927: optical observations
  71. GRB 060926: Swift-UVOT UVW1 Detection Retraction
  72. GRB 060927: Early color
  73. GRB 060927, Swift-BAT refined analysis
  74. GRB 060927: Xinglong TNT optical observations
  75. GRB060927: Faulkes Telescope South observation
  76. GRB 060926: MASTER: first minutes decay
  77. GRB 060927A: ROTSE-III Detection of Optical Counterpart
  78. GRB 060927: Swift detection of a burst
  79. GRB 060926: OPTIMA-Burst -- further observations
  80. GRB 060926: Swift XRT refined analysis
  81. GRB 060926, Swift-BAT refined analysis
  82. GRB 060926: MASTER OT alert observation
  83. GRB 060926: MASTER optical observation
  84. GRB 060923C, Swift-BAT refined analysis
  85. GRB060923C: AROMA optical obsevation
  86. GRB 060923C: Gemini Observations and Afterglow Candidate
  87. GRB 060923A: Gemini Second Epoch and Afterglow Confirmation
  88. GRB060923B: Swift/UVOT upper limits
  89. GRB 060923C: Swift XRT refined analysis
  90. GRB 060923A: Keck and Gemini Observations
  91. GRB 060923B, Swift-BAT refined analysis
  92. GRB060923C: Faulkes Telescope North optical observations
  93. GRB 060923B: Swift detection of a burst
  94. GRB 060923, Swift-BAT refined analysis
  95. GRB060923: Faulkes Telescope North optical observations
  96. Swift detects a hard X-ray burst from AXP CXOU J164710.2-455216
  97. GRB 060919, Swift-BAT refined analysis
  98. GRB 060912A: Probable Host Galaxy
  99. IBAS Alert n.3470: not a GRB
  100. Konus-Wind observation of GRB 060912

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