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"

36138 results found.

  1. GRB051022 (=H3590), A GRB Detected By HETE
  2. GRB 051022: Optical observations
  3. GRB 051021,optical observation
  4. GRB051021B: Swift XRT Position
  5. GRB 051021: SOAR NIR Observations
  6. GRB 051021B: Swift detection of a burst
  7. GRB051021 (=H3947): Refined Analysis
  8. GRB 051021 : optical afterglow observation at Lulin
  9. GRB 051021: Optical observations
  10. GRB 051021: ROTSE-III Confirmation of Optical Counterpart
  11. GRB 051021: Optical observations and candidate afterglow
  12. GRB051021.63
  13. GRB051021.6: MASTER optical observation
  14. Swift-BAT trigger 160640 is not a real GRB
  15. GRB051021: A GRB Localized by HETE
  16. Swift-BAT trigger 160619 is not a GRB
  17. Swift-BAT triggered on a posible CR Shower or possible GRB
  18. GRB 050502b: Optical limit
  19. GRB 051016b: Optical limit
  20. Afterglow candidate of GRB 051016B observed at Lulin
  21. GRB 051016b: Gemini Near IR Observations
  22. GRB 051016A: Swift/UVOT upper limits
  23. GRB 051016B: refined analysis of the Swift/XRT data
  24. GRB 051016B: Swift/UVOT detection
  25. GRB 051016B,optical observation
  26. GRB 051016B : Optical follow-up at Lulin
  27. GRB 051016B: Refined analysis of the Swift-BAT burst
  28. GRB 051016B: Swift detection of a soft burst
  29. GRB 051016: Swift-BAT refined analysis
  30. GRB051016: Swift XRT refined analysis.
  31. GRB 051016: LCO optical and near-IR imaging
  32. GRB 051016: PROMPT Observations
  33. GRB051016: Swift detection of a burst
  34. Photometric calibration of Swift/UVOT and Re-analysis of Swift/UVOT GRB 050922C data
  35. GRB051006: optical observations
  36. GRB 051012: Swift-BAT detection of burst yesterday
  37. Swift trigger 159578 is not a burst
  38. GRB 051006: Swift/UVOT Upper Limits
  39. IBAS Alert 2675 : not a GRB
  40. GRB051008: optical candidate
  41. GRB 051008: - a high redshift high-luminosity burst?
  42. GRB 051008 - a low redshift low-luminosity burst?
  43. IBAS Alert 2673: not a real GRB
  44. GRB051011: MASTER optical observation
  45. GRB051008: optical observation
  46. GRB051008: Swift XRT refined analysis
  47. GRB051008 - Swift UVOT upper limits
  48. Konus-Wind observation of GRB 051008
  49. GRB051008: Final refined analysis of the Swift-BAT burst
  50. GRB 051008: R-band upper limit
  51. GRB051008: Radio Observation
  52. GRB 051008: Swift XRT position
  53. GRB 051008, optical observations
  54. GRB 051008: early Swift XRT analysis
  55. GRB 051008: Swift UVOT Candidate
  56. GRB 051006: P60 Observations
  57. grb test
  58. GRB 051006: XRT refined analysis
  59. GRB 051006: optical observations at Sierra Nevada
  60. GRB 051006: XRT position
  61. GRB 050906, summary of radio observations
  62. GRB 050925: Second Epoch WSRT Radio Observations
  63. GRB 051001: Swift XRT refined analysis
  64. GRB 051001, optical observations at Mt. John
  65. GRB 051001: I-band limit
  66. GRB 051001: AAT infra-red observations
  67. GRB 051001: Swift-BAT refined analysis
  68. GRB 051001: Swift Detection of a Burst
  69. GRB 051001: ROTSE-III Optical Limits
  70. GRB050908: optical observations
  71. GRB050922C: optical observation
  72. GRB050922B: optical limit
  73. GRB 050922C: further VLT observations
  74. GRB 050820A: NIR photometry at the TNG
  75. GRB050922C: UVES/VLT high resolution spectroscopy
  76. GRB050925: Swift/XRT limits
  77. GRB/SGR 050925: IR Observations
  78. GRB 050922C: break in the lightcurve
  79. GRB 050925: WSRT Radio Observations
  80. GRB 050925 : I-band observation at Xinglong observatory
  81. GRB050925: Faulkes Telescope North R-band limit
  82. GRB050925: Swift-BAT detection of a short burst
  83. GRB 050922B: Correction to BAT refined analysis, longer burst
  84. GRB050922C: TNG spectroscopic observations
  85. GRB050922B: refined XRT analysis
  86. Konus-Wind observation of GRB 050922C
  87. GRB 050922C: Refined redshift
  88. GRB OT observation
  89. GRB050922C: observation at MonteBoo
  90. INT 2.5m limit for GRB050922B
  91. GRB 050922B: optical limit
  92. GRB050922C: Optical Observations
  93. GRB 050922C: Swift XRT refined analysis
  94. HETE Fregate observations of GRB 050922C
  95. GRB 050922C: Swift-BAT refined analysis
  96. GRB 050922B: Swift-BAT refined analysis
  97. GRB 050922C: Absorption redshift from the Nordic Optical Telescope
  98. GRB 050922C: optical obserations
  99. GRB 050922C: NOT optical observations
  100. GRB 050922A: Analysis of Swift/XRT TOO observation

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