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"

36196 results found.

  1. GRB 051105: Swift-BAT refined analysis
  2. GRB 051105: Optical limit
  3. GRB 051105: Swift detection of a short burst
  4. IBAS Alert 2700: Not a GRB
  5. GRB 051016B host spectroscopy and redshift
  6. GRB051016B: optical observation
  7. Recent GRB UBVRcIc field photometry
  8. Konus-Wind observation of GRB 051028
  9. GRB051028:MASTER correction and final results
  10. GRB 051022: RTT150 optical observations
  11. GRB 051021A: RTT150 optical observations
  12. GRB051028 SARA Observation
  13. GRB051028: optical observations
  14. GRB051028: Swift/UVOT upper limits
  15. GRB051028: confirmation of the afterglow
  16. GRB051028: WHT optical candidate
  17. GRB051028: Swift XRT Position
  18. GRB051028:MASTER observations
  19. GRB 051028 (=H3951): A GRB localized by HETE
  20. GRB051028:MASTER optical observations
  21. GRB 051022: XRT Refined Spectral and Temporal Analysis--Correction
  22. GRB051022: Swift XRT measurement of jet break
  23. GRB051021B: Swift/UVOT Upper limits
  24. GRB 051021, Optical Observations
  25. GRB 051022: XRT Refined Spectral and Temporal Analysis
  26. GRB 051022, refined optical astrometry
  27. Chandra Observations of GRB 051022
  28. GRB 051022 Chandra Observations scheduled
  29. GRB051021a: optical observations
  30. GRB 051022: WSRT Radio Detection
  31. GRB 051022, mm counterpart
  32. GRB051022: host galaxy redshift
  33. GRB 051022: Swift/UVOT Upper Limits
  34. GRB051022: Radio Counterpart
  35. GRB 051022: SOAR JKs Observations
  36. Konus-Wind observation of GRB 051022
  37. GRB051022: Optical Observations
  38. GRB 051022: Magellan NIR imaging
  39. GRB 051021: PROMPT RcIc Observations
  40. GRB051021b: Magellan IR Imaging
  41. GRB 051022: Spectral Analysis Indicates That The Spectrum Is Absorbed
  42. GRB 051021: Correction
  43. GRB 051022, J & K-band observation
  44. GRB 051021, SMARTS optical/IR observations
  45. GRB 051021: P200 Ks Observations
  46. IPN triangulation of GRB051022 (=H3950)
  47. GRB 051021: MDM Upper Limit
  48. GRB 051022 (=H3950): SXC Flight Localization is Valid
  49. GRB051021: Swift/UVOT Upper Limits
  50. GRB 051021B: Refined analysis of the Swift-BAT burst
  51. GRB 051022: SSO40 Optical Observations
  52. GRB 051022A: ROTSE-III Optical Limits
  53. GRB051022 (=H3590), A GRB Detected By HETE
  54. GRB 051022: Optical observations
  55. GRB 051021,optical observation
  56. GRB051021B: Swift XRT Position
  57. GRB 051021: SOAR NIR Observations
  58. GRB 051021B: Swift detection of a burst
  59. GRB051021 (=H3947): Refined Analysis
  60. GRB 051021 : optical afterglow observation at Lulin
  61. GRB 051021: Optical observations
  62. GRB 051021: ROTSE-III Confirmation of Optical Counterpart
  63. GRB 051021: Optical observations and candidate afterglow
  64. GRB051021.63
  65. GRB051021.6: MASTER optical observation
  66. Swift-BAT trigger 160640 is not a real GRB
  67. GRB051021: A GRB Localized by HETE
  68. Swift-BAT trigger 160619 is not a GRB
  69. Swift-BAT triggered on a posible CR Shower or possible GRB
  70. GRB 050502b: Optical limit
  71. GRB 051016b: Optical limit
  72. Afterglow candidate of GRB 051016B observed at Lulin
  73. GRB 051016b: Gemini Near IR Observations
  74. GRB 051016A: Swift/UVOT upper limits
  75. GRB 051016B: refined analysis of the Swift/XRT data
  76. GRB 051016B: Swift/UVOT detection
  77. GRB 051016B,optical observation
  78. GRB 051016B : Optical follow-up at Lulin
  79. GRB 051016B: Refined analysis of the Swift-BAT burst
  80. GRB 051016B: Swift detection of a soft burst
  81. GRB 051016: Swift-BAT refined analysis
  82. GRB051016: Swift XRT refined analysis.
  83. GRB 051016: LCO optical and near-IR imaging
  84. GRB 051016: PROMPT Observations
  85. GRB051016: Swift detection of a burst
  86. Photometric calibration of Swift/UVOT and Re-analysis of Swift/UVOT GRB 050922C data
  87. GRB051006: optical observations
  88. GRB 051012: Swift-BAT detection of burst yesterday
  89. Swift trigger 159578 is not a burst
  90. GRB 051006: Swift/UVOT Upper Limits
  91. IBAS Alert 2675 : not a GRB
  92. GRB051008: optical candidate
  93. GRB 051008: - a high redshift high-luminosity burst?
  94. GRB 051008 - a low redshift low-luminosity burst?
  95. IBAS Alert 2673: not a real GRB
  96. GRB051011: MASTER optical observation
  97. GRB051008: optical observation
  98. GRB051008: Swift XRT refined analysis
  99. GRB051008 - Swift UVOT upper limits
  100. Konus-Wind observation of GRB 051008

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