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"

36308 results found.

  1. GRB 051105a: MDM Observations
  2. GRB 051105A: TNG optical observations
  3. GRB051105A: Swift/UVOT Observations
  4. GRB 051105A, radio observations
  5. GRB051103:_MASTER_optical_observations
  6. IPN triangulation and Konus spectrum of the bright short/hard GRB051103
  7. GRB 051105A, optical observations
  8. XRT observations of GRB 051105A
  9. GRB 051105: Swift-BAT improved refined analysis
  10. GRB 051105b: ART optical limits
  11. GRB051105B - A long GRB detected by INTEGRAL
  12. GRB 051105B (INTEGRAL 2701): Optical observation
  13. GRB 051105: Swift-BAT refined analysis
  14. GRB 051105: Optical limit
  15. GRB 051105: Swift detection of a short burst
  16. IBAS Alert 2700: Not a GRB
  17. GRB 051016B host spectroscopy and redshift
  18. GRB051016B: optical observation
  19. Recent GRB UBVRcIc field photometry
  20. Konus-Wind observation of GRB 051028
  21. GRB051028:MASTER correction and final results
  22. GRB 051022: RTT150 optical observations
  23. GRB 051021A: RTT150 optical observations
  24. GRB051028 SARA Observation
  25. GRB051028: optical observations
  26. GRB051028: Swift/UVOT upper limits
  27. GRB051028: confirmation of the afterglow
  28. GRB051028: WHT optical candidate
  29. GRB051028: Swift XRT Position
  30. GRB051028:MASTER observations
  31. GRB 051028 (=H3951): A GRB localized by HETE
  32. GRB051028:MASTER optical observations
  33. GRB 051022: XRT Refined Spectral and Temporal Analysis--Correction
  34. GRB051022: Swift XRT measurement of jet break
  35. GRB051021B: Swift/UVOT Upper limits
  36. GRB 051021, Optical Observations
  37. GRB 051022: XRT Refined Spectral and Temporal Analysis
  38. GRB 051022, refined optical astrometry
  39. Chandra Observations of GRB 051022
  40. GRB 051022 Chandra Observations scheduled
  41. GRB051021a: optical observations
  42. GRB 051022: WSRT Radio Detection
  43. GRB 051022, mm counterpart
  44. GRB051022: host galaxy redshift
  45. GRB 051022: Swift/UVOT Upper Limits
  46. GRB051022: Radio Counterpart
  47. GRB 051022: SOAR JKs Observations
  48. Konus-Wind observation of GRB 051022
  49. GRB051022: Optical Observations
  50. GRB 051022: Magellan NIR imaging
  51. GRB 051021: PROMPT RcIc Observations
  52. GRB051021b: Magellan IR Imaging
  53. GRB 051022: Spectral Analysis Indicates That The Spectrum Is Absorbed
  54. GRB 051021: Correction
  55. GRB 051022, J & K-band observation
  56. GRB 051021, SMARTS optical/IR observations
  57. GRB 051021: P200 Ks Observations
  58. IPN triangulation of GRB051022 (=H3950)
  59. GRB 051021: MDM Upper Limit
  60. GRB 051022 (=H3950): SXC Flight Localization is Valid
  61. GRB051021: Swift/UVOT Upper Limits
  62. GRB 051021B: Refined analysis of the Swift-BAT burst
  63. GRB 051022: SSO40 Optical Observations
  64. GRB 051022A: ROTSE-III Optical Limits
  65. GRB051022 (=H3590), A GRB Detected By HETE
  66. GRB 051022: Optical observations
  67. GRB 051021,optical observation
  68. GRB051021B: Swift XRT Position
  69. GRB 051021: SOAR NIR Observations
  70. GRB 051021B: Swift detection of a burst
  71. GRB051021 (=H3947): Refined Analysis
  72. GRB 051021 : optical afterglow observation at Lulin
  73. GRB 051021: Optical observations
  74. GRB 051021: ROTSE-III Confirmation of Optical Counterpart
  75. GRB 051021: Optical observations and candidate afterglow
  76. GRB051021.63
  77. GRB051021.6: MASTER optical observation
  78. Swift-BAT trigger 160640 is not a real GRB
  79. GRB051021: A GRB Localized by HETE
  80. Swift-BAT trigger 160619 is not a GRB
  81. Swift-BAT triggered on a posible CR Shower or possible GRB
  82. GRB 050502b: Optical limit
  83. GRB 051016b: Optical limit
  84. Afterglow candidate of GRB 051016B observed at Lulin
  85. GRB 051016b: Gemini Near IR Observations
  86. GRB 051016A: Swift/UVOT upper limits
  87. GRB 051016B: refined analysis of the Swift/XRT data
  88. GRB 051016B: Swift/UVOT detection
  89. GRB 051016B,optical observation
  90. GRB 051016B : Optical follow-up at Lulin
  91. GRB 051016B: Refined analysis of the Swift-BAT burst
  92. GRB 051016B: Swift detection of a soft burst
  93. GRB 051016: Swift-BAT refined analysis
  94. GRB051016: Swift XRT refined analysis.
  95. GRB 051016: LCO optical and near-IR imaging
  96. GRB 051016: PROMPT Observations
  97. GRB051016: Swift detection of a burst
  98. Photometric calibration of Swift/UVOT and Re-analysis of Swift/UVOT GRB 050922C data
  99. GRB051006: optical observations
  100. GRB 051012: Swift-BAT detection of burst yesterday

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