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"

45576 results found.

  1. GRB 051022A: ROTSE-III Optical Limits
  2. GRB051022 (=H3590), A GRB Detected By HETE
  3. GRB 051022: Optical observations
  4. GRB 051021,optical observation
  5. GRB051021B: Swift XRT Position
  6. GRB 051021: SOAR NIR Observations
  7. GRB 051021B: Swift detection of a burst
  8. GRB051021: Swift XRT analysis
  9. GRB051021 (=H3947): Refined Analysis
  10. GRB 051021 : optical afterglow observation at Lulin
  11. GRB 051021: Optical observations
  12. GRB 051021: ROTSE-III Confirmation of Optical Counterpart
  13. GRB 051021: Optical observations and candidate afterglow
  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 XMM-Newton observation
  31. GRB051016: Swift XRT refined analysis.
  32. GRB051016: Planned XMM-Newton observation
  33. GRB 051016: LCO optical and near-IR imaging
  34. GRB 051016: PROMPT Observations
  35. GRB051016: Swift detection of a burst
  36. Photometric calibration of Swift/UVOT and Re-analysis of Swift/UVOT GRB 050922C data
  37. GRB051006: optical observations
  38. GRB 051012: Swift-BAT detection of burst yesterday
  39. Swift trigger 159578 is not a burst
  40. Swift-BAT Trigger 159578 is a possible burst
  41. GRB050805A: Rc optical observations
  42. GRB 051006: Swift/UVOT Upper Limits
  43. IBAS Alert 2675 : not a GRB
  44. GRB051008: optical candidate
  45. GRB 051008: - a high redshift high-luminosity burst?
  46. GRB 051008 - a low redshift low-luminosity burst?
  47. IBAS Alert 2673: not a real GRB
  48. GRB051011: bright nebulae near error box
  49. GRB051008: optical observation
  50. GRB051008: Swift XRT refined analysis
  51. GRB051008 - Swift UVOT upper limits
  52. Konus-Wind observation of GRB 051008
  53. GRB051008: Final refined analysis of the Swift-BAT burst
  54. GRB 051008: R-band upper limit
  55. GRB051008: Refined analysis of the Swift-BAT burst
  56. GRB051008: Radio Observation
  57. GRB 051008: Swift XRT position
  58. GRB 051008, optical observations
  59. GRB 051008: early Swift XRT analysis
  60. GRB 051008: Swift UVOT Candidate
  61. GRB051008: Swift-BAT detection of a bright burst
  62. GRB 051006: P60 Observations
  63. grb test
  64. GRB 051006: XRT refined analysis
  65. Swift-BAT trigger 158700 is a probable Cosmic Ray Shower Event
  66. GRB 051006: optical observations at Sierra Nevada
  67. GRB051006: Refined analysis of the Swift-BAT burst
  68. GRB 051006: XRT position
  69. GRB051006: Swift detection of a burst
  70. GRB 050906, summary of radio observations
  71. Swift-BAT triggers 158261 and 158262 Retraction
  72. GRB051001: Swift UVOT Upper Limits
  73. GRB 050925: Second Epoch WSRT Radio Observations
  74. GRB 051001: Swift XRT refined analysis
  75. GRB 051001, optical observations at Mt. John
  76. GRB 051001: I-band limit
  77. GRB 051001: AAT infra-red observations
  78. GRB 051001: Swift-BAT refined analysis
  79. GRB 051001: Swift Detection of a Burst
  80. GRB 051001: ROTSE-III Optical Limits
  81. GRB050908: optical observations
  82. GRB050922C: optical observation
  83. GRB050922B: optical limit
  84. GRB 050922C: further VLT observations
  85. GRB 050820A: NIR photometry at the TNG
  86. GRB050922C: UVES/VLT high resolution spectroscopy
  87. GRB050925: Swift/XRT limits
  88. GRB/SGR 050925: IR Observations
  89. GRB050922C - Swift UVOT preliminary analysis
  90. GRB 050922C: break in the lightcurve
  91. GRB 050925: WSRT Radio Observations
  92. GRB050925: Swift UVOT upper limits
  93. Refined analysis of the Swift-BAT soft short burst
  94. GRB 050925 : I-band observation at Xinglong observatory
  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. GRB050922C: TNG spectroscopic observations
  99. GRB050922B: refined XRT analysis
  100. Konus-Wind observation of GRB 050922C

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