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"

36215 results found.

  1. GRB051016: Swift XRT refined analysis.
  2. GRB 051016: LCO optical and near-IR imaging
  3. GRB 051016: PROMPT Observations
  4. GRB051016: Swift detection of a burst
  5. Photometric calibration of Swift/UVOT and Re-analysis of Swift/UVOT GRB 050922C data
  6. GRB051006: optical observations
  7. GRB 051012: Swift-BAT detection of burst yesterday
  8. Swift trigger 159578 is not a burst
  9. GRB 051006: Swift/UVOT Upper Limits
  10. IBAS Alert 2675 : not a GRB
  11. GRB051008: optical candidate
  12. GRB 051008: - a high redshift high-luminosity burst?
  13. GRB 051008 - a low redshift low-luminosity burst?
  14. IBAS Alert 2673: not a real GRB
  15. GRB051011: MASTER optical observation
  16. GRB051008: optical observation
  17. GRB051008: Swift XRT refined analysis
  18. GRB051008 - Swift UVOT upper limits
  19. Konus-Wind observation of GRB 051008
  20. GRB051008: Final refined analysis of the Swift-BAT burst
  21. GRB 051008: R-band upper limit
  22. GRB051008: Radio Observation
  23. GRB 051008: Swift XRT position
  24. GRB 051008, optical observations
  25. GRB 051008: early Swift XRT analysis
  26. GRB 051008: Swift UVOT Candidate
  27. GRB 051006: P60 Observations
  28. grb test
  29. GRB 051006: XRT refined analysis
  30. GRB 051006: optical observations at Sierra Nevada
  31. GRB 051006: XRT position
  32. GRB 050906, summary of radio observations
  33. GRB 050925: Second Epoch WSRT Radio Observations
  34. GRB 051001: Swift XRT refined analysis
  35. GRB 051001, optical observations at Mt. John
  36. GRB 051001: I-band limit
  37. GRB 051001: AAT infra-red observations
  38. GRB 051001: Swift-BAT refined analysis
  39. GRB 051001: Swift Detection of a Burst
  40. GRB 051001: ROTSE-III Optical Limits
  41. GRB050908: optical observations
  42. GRB050922C: optical observation
  43. GRB050922B: optical limit
  44. GRB 050922C: further VLT observations
  45. GRB 050820A: NIR photometry at the TNG
  46. GRB050922C: UVES/VLT high resolution spectroscopy
  47. GRB050925: Swift/XRT limits
  48. GRB/SGR 050925: IR Observations
  49. GRB 050922C: break in the lightcurve
  50. GRB 050925: WSRT Radio Observations
  51. GRB 050925 : I-band observation at Xinglong observatory
  52. GRB050925: Faulkes Telescope North R-band limit
  53. GRB050925: Swift-BAT detection of a short burst
  54. GRB 050922B: Correction to BAT refined analysis, longer burst
  55. GRB050922C: TNG spectroscopic observations
  56. GRB050922B: refined XRT analysis
  57. Konus-Wind observation of GRB 050922C
  58. GRB 050922C: Refined redshift
  59. GRB OT observation
  60. GRB050922C: observation at MonteBoo
  61. INT 2.5m limit for GRB050922B
  62. GRB 050922B: optical limit
  63. GRB050922C: Optical Observations
  64. GRB 050922C: Swift XRT refined analysis
  65. HETE Fregate observations of GRB 050922C
  66. GRB 050922C: Swift-BAT refined analysis
  67. GRB 050922B: Swift-BAT refined analysis
  68. GRB 050922C: Absorption redshift from the Nordic Optical Telescope
  69. GRB 050922C: optical obserations
  70. GRB 050922C: NOT optical observations
  71. GRB 050922A: Analysis of Swift/XRT TOO observation
  72. GRB 050922C: Swift detection of a bright burst
  73. GRB 050922C: ROTSE-IIId Refined Analysis
  74. GRB 050922C: ROTSE-III Detection of Possible Counterpart
  75. GRB 050922B: ROTSE-III Optical Limits
  76. GRB 050922B,optical observation
  77. GRB050922B: Swift-BAT detection of a weak long burst
  78. Possible GRB 050922 detected by INTEGRAL
  79. GRB050820B: analysis of the XMM-Newton observation
  80. GRB050916: Swift/UVOT Upper Limits
  81. GRB 050916: Swift-BAT refined analysis
  82. GRB 050918 - A long GRB detected by INTEGRAL
  83. GRB 050915a: Radio Observations
  84. Swift-BAT trigger 155764 is not a GRB
  85. Swift-BAT trigger 155764 is probably not a GRB
  86. Swift-BAT trigger 155535 is definitely not a GRB
  87. GRB 050916: XRT position
  88. GRB 050915b, SMARTS optical/IR observations of the XRT position
  89. GRB 050915B: Swift-BAT refined analysis
  90. GRB 050915B: Swift/UVOT Upper Limits
  91. GRB 050915a: IR Transient
  92. GRB 050915B: XRT position
  93. GRB 050915b, SMARTS optical/IR observations
  94. GRB 050915: KAIT optical limit
  95. GRB 050915: IR Observations
  96. GRB 050915: Swift XRT refined analysis
  97. GRB 050915: Swift-BAT refined analysis
  98. GRB050915: P60 Optical Observations
  99. GRB 050915: ROTSE-III optical limits
  100. GRB 050915: Swift detection of a GRB

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