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"

21469 results found.

  1. GRB 051105A, optical observations
  2. XRT observations of GRB 051105A
  3. GRB 051105: Swift-BAT improved refined analysis
  4. GRB 051105: Swift-BAT refined analysis
  5. GRB 051105: Swift detection of a short burst
  6. GRB 051022: RTT150 optical observations
  7. GRB051028: Swift/UVOT upper limits
  8. GRB051028: WHT optical candidate
  9. GRB051028: Swift XRT Position
  10. GRB 051022: XRT Refined Spectral and Temporal Analysis--Correction
  11. GRB051022: Swift XRT measurement of jet break
  12. GRB051021B: Swift/UVOT Upper limits
  13. GRB 051022: XRT Refined Spectral and Temporal Analysis
  14. GRB051012: Swift-XRT analysis
  15. GRB051021B: Swift XRT refined analysis
  16. GRB 051022: WSRT Radio Detection
  17. GRB051022: host galaxy redshift
  18. GRB 051022: Swift/UVOT Upper Limits
  19. GRB051022: IR observations
  20. GRB 051022: SOAR JKs Observations
  21. GRB051021A: Swift XRT refined analysis
  22. GRB051022: Optical Observations
  23. GRB 051022: Magellan NIR imaging
  24. GRB051021b: Magellan IR Imaging
  25. GRB 051022, J & K-band observation
  26. GRB051022: Swift XRT Position
  27. GRB051021: Swift/UVOT Upper Limits
  28. GRB 051021B: Refined analysis of the Swift-BAT burst
  29. GRB051021B: Swift XRT Position
  30. GRB 051021B: Swift detection of a burst
  31. GRB051021: Swift XRT analysis
  32. GRB051021.63
  33. Swift-BAT trigger 160640 is not a real GRB
  34. Swift-BAT trigger 160619 is not a GRB
  35. Swift-BAT triggered on a posible CR Shower or possible GRB
  36. GRB 051016b: Gemini Near IR Observations
  37. GRB 051016A: Swift/UVOT upper limits
  38. GRB 051016B: refined analysis of the Swift/XRT data
  39. GRB 051016B: Swift/UVOT detection
  40. GRB 051016B : Optical follow-up at Lulin
  41. GRB 051016B: Refined analysis of the Swift-BAT burst
  42. GRB 051016B: Swift detection of a soft burst
  43. GRB 051016: Swift-BAT refined analysis
  44. GRB051016 XMM-Newton observation
  45. GRB051016: Swift XRT refined analysis.
  46. GRB 051016: LCO optical and near-IR imaging
  47. GRB 051016: PROMPT Observations
  48. GRB051016: Swift detection of a burst
  49. Photometric calibration of Swift/UVOT and Re-analysis of Swift/UVOT GRB 050922C data
  50. GRB051006: optical observations
  51. GRB 051012: Swift-BAT detection of burst yesterday
  52. Swift trigger 159578 is not a burst
  53. Swift-BAT Trigger 159578 is a possible burst
  54. GRB050805A: Rc optical observations
  55. GRB 051006: Swift/UVOT Upper Limits
  56. GRB051008: optical candidate
  57. GRB 051008 - a low redshift low-luminosity burst?
  58. GRB051008: optical observation
  59. GRB051008: Swift XRT refined analysis
  60. GRB051008 - Swift UVOT upper limits
  61. Konus-Wind observation of GRB 051008
  62. GRB051008: Final refined analysis of the Swift-BAT burst
  63. GRB 051008: R-band upper limit
  64. GRB051008: Refined analysis of the Swift-BAT burst
  65. GRB051008: Radio Observation
  66. GRB 051008: Swift XRT position
  67. GRB 051008: early Swift XRT analysis
  68. GRB 051008: Swift UVOT Candidate
  69. GRB051008: Swift-BAT detection of a bright burst
  70. GRB 051006: P60 Observations
  71. GRB 051006: XRT refined analysis
  72. Swift-BAT trigger 158700 is a probable Cosmic Ray Shower Event
  73. GRB 051006: optical observations at Sierra Nevada
  74. GRB051006: Refined analysis of the Swift-BAT burst
  75. GRB 051006: XRT position
  76. GRB051006: Swift detection of a burst
  77. GRB 050906, summary of radio observations
  78. Swift-BAT triggers 158261 and 158262 Retraction
  79. GRB051001: Swift UVOT Upper Limits
  80. GRB 050925: Second Epoch WSRT Radio Observations
  81. GRB 051001: Swift XRT refined analysis
  82. GRB 051001, optical observations at Mt. John
  83. GRB 051001: I-band limit
  84. GRB 051001: AAT infra-red observations
  85. GRB 051001: Swift-BAT refined analysis
  86. GRB 051001: Swift Detection of a Burst
  87. GRB 051001: ROTSE-III Optical Limits
  88. GRB050922B: optical limit
  89. GRB050925: Swift/XRT limits
  90. GRB/SGR 050925: IR Observations
  91. GRB050922C - Swift UVOT preliminary analysis
  92. GRB 050925: WSRT Radio Observations
  93. GRB050925: Swift UVOT upper limits
  94. Refined analysis of the Swift-BAT soft short burst
  95. GRB050925: Faulkes Telescope North R-band limit
  96. GRB050925: Swift-BAT detection of a short burst
  97. GRB 050922B: Correction to BAT refined analysis, longer burst
  98. GRB050922B: refined XRT analysis
  99. Konus-Wind observation of GRB 050922C
  100. GRB050922B: Swift UVOT early upper limits.

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