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"

28237 results found.

  1. GRB050421: P60 Observations
  2. GRB 050421: BOOTES-2 simultaneous optical observations
  3. GRB 050416b: Tentative Swift XRT Position
  4. GRB 050315: potential host galaxy
  5. GRB050326: analysis of the XMM-Newton observation
  6. GRB050418: Null Optical Observations
  7. GRB050416A, optical observations
  8. GRB 050418: Swift-BAT refined analysis
  9. GRB 050416: Mitsume optical observation
  10. GRB050416B: IR observations
  11. GRB050412: Radio Observations
  12. GRB 050416: Swift/UVOT detection of afterglow emission
  13. GRB050416: Refined Swift-XRT analysis
  14. GRB 050416,optical observation
  15. GRB050416: P200 NIR Observations
  16. GRB 050416: Radio observations
  17. Swift BAT/XRT Detection of GRB 050416
  18. GRB 050412: PROMPT VRcIc Observations
  19. GRB 050408: Kuiper 1.5m observations
  20. GRB 050412: early Swift XRT analysis results
  21. GRB 050412: Early Optical/Ultraviolet Observations with
  22. GRB 050408: SDSS Field Calibration
  23. GRB050412: P60 Observations
  24. GRB 050412: Swift XRT Position
  25. Swift-BAT Detection of GRB 050412: A Bright, Long Burst
  26. GRB 050412: IR and Optical observations
  27. GRB 050412: IR Observations
  28. GRB050408: Radio Observations
  29. GRB 050401: Optical limit
  30. GRB050410: P60 Observations
  31. GRB 050410: Early Optical/Ultraviolet Observations with Swift/UVOT
  32. GRB 050408: Early Optical/Ultraviolet Observations with Swift/UVOT
  33. GRB050410: Radio Observations
  34. GRB050410: MASTER optical observations
  35. GRB 050410: Early observations with Swift-UVOT
  36. Swift-BAT detection of GRB 050410
  37. GRB 050408: Inconsistency of host galaxy identification
  38. GRB 050408: Subaru Observations
  39. GRB 050408: WIDGET simultaneous optical observations
  40. GRB 050408: Properties of the Host Galaxy
  41. GRB050408: Radio Observations
  42. GRB 050408: Swift XRT analysis
  43. GRB 050408: Optical limit at 20 min after the burst
  44. GRB050408: REM NIR and Optical observation
  45. GRB 050408,optical observation
  46. GRB 050408: Mercator Optical Observations
  47. GRB 050408: Optical afterglow confirmed
  48. GRB 050408: opitcal observation
  49. GRB 050408, optical observations
  50. GRB 050408 optical candidate
  51. GRB 050408: Swift XRT Position
  52. GRB050408: MASTER optical observations
  53. GRB050401: Radio Detection
  54. GRB 050406: early Swift XRT analysis results
  55. GRB 050406 BAT refined analysis
  56. GRB 050406: Early observations with Swift-UVOT
  57. Swift-BAT detection of GRB 050406
  58. GRB050401, radio observation at 4.8 GHz and 8.64 GHz
  59. GRB 050401: VLT spectroscopic redshift
  60. GRB 050401 BAT refined analysis
  61. GRB050401: TNG R-band observation
  62. GRB 050402: Early observations with Swift-UVOT
  63. Swift Trigger 113225: P60 Observations
  64. GRB 050401: Optical afterglow confirmed
  65. GRB 050401: Prompt XRT position
  66. Retraction of three Swift GRB triggers
  67. GRB050331: No Afterglow Detected
  68. Swift-BAT detection of GRB 050331b
  69. GRB 050331: Swift UVOT Source
  70. Swift-BAT detection of GRB 050331
  71. GRB 050326: Early observations with Swift-UVOT
  72. GRB 050326 XMM-Newton observation
  73. GRB 050326: Swift XRT Position
  74. GRB 050326 BAT refined analysis
  75. GRB050326: delayed XRT observation
  76. GRB050319, color indices
  77. GRB050319: optical observation, March 20-22
  78. GRB050319: RTT150 Optical Observations
  79. Swift-BAT trigger 112060 is not a real GRB
  80. GRB 050318: Swift-BAT refined analysis
  81. GRB050319: VLA Observations
  82. GRB050319: radio observation
  83. GRB 050319: Swift-UVOT detection of the afterglow
  84. GRB 050315: Variability Analysis of Swift BAT Time History
  85. GRB050319: Radio Observations
  86. GRB 050319: NIR afterglow candidate
  87. GRB 050319:Near IR afterglow
  88. GRB 050318: SWIFT-UVOT refined analysis
  89. GRB 050319 : Confirmation of optical afterglow decay
  90. GRB 050319: Swift-BAT refined analysis
  91. GRB050319,optical observation
  92. GRB 050318: Swift/UVOT detection of afterglow emission
  93. RXTE Observations of GRB050318
  94. GRB050223: analysis of the XMM-Newton observation
  95. GRB050316: MASTER before, simultanious and follow up optical
  96. GRB 050306: ROTSE-III early limits
  97. GRB050316: MASTER optical observations
  98. GRB 050315: Swift-BAT further refined analysis
  99. GRB 050315 I-band observations
  100. GRB050315: Radio afterglow

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