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"

19611 results found.

  1. GRB 050410, optical observations
  2. GRB 050408: Early Optical/Ultraviolet Observations with Swift/UVOT
  3. GRB 050410 R band Optical Observations
  4. GRB050410 : Null detection report
  5. GRB 050410, optical observations
  6. GRB050410: Radio Observations
  7. GRB 050408: Swift XRT measurement of possible jet break
  8. GRB050410: MASTER optical observations
  9. GRB 050410: Early observations with Swift-UVOT
  10. Swift-BAT detection of GRB 050410
  11. GRB 050410: Swift XRT Position
  12. GRB 050408: Properties of the Host Galaxy
  13. GRB 050408: Swift XRT analysis
  14. GRB 050408, optical observations
  15. GRB050408: REM NIR and Optical observation
  16. GRB 050408 Optical Observations
  17. GRB 050408: Optical afterglow confirmed
  18. GRB 050408, optical observations
  19. GRB 050408 optical candidate
  20. GRB 050408: Swift XRT Position
  21. Swift-UVOT Optical Counterpart Candidate to XRF 050406
  22. GRB 050406: early Swift XRT analysis results
  23. GRB 050406 BAT refined analysis
  24. GRB 050406: Early observations with Swift-UVOT
  25. GRB 050406: Swift XRT Position
  26. Swift-BAT detection of GRB 050406
  27. Konus-Wind observation of GRB 050401
  28. GRB050401: Radio observation at 610 MHz with GMRT
  29. GRB 050401: VLT spectroscopic redshift
  30. GRB 050401 Optical Observations
  31. GRB050401: Maidanak optical observation
  32. GRB 050401 BAT refined analysis
  33. Very questionable identity of Swift-BAT GRB050402 (Trig=113225)
  34. GRB 050402A: IR Observations
  35. GRB 050402: Early observations with Swift-UVOT
  36. Swift Trigger 113225: P60 Observations
  37. GRB050401: ROTSE-III Detection of Prompt Optical Counterpart
  38. GRB 050401: Optical afterglow candidate
  39. Swift-BAT detection of GRB 050401
  40. GRB 050401: Prompt XRT position
  41. Retraction of three Swift GRB triggers
  42. Swift-BAT detection of GRB 050331b
  43. GRB 050331: Swift UVOT Source
  44. Swift-BAT detection of GRB 050331
  45. GRB 050331: Swift XRT Position
  46. Swift Data Publicly Available Starting April 5, 2005
  47. Konus-Wind observation of GRB 050326
  48. GRB050326: optical limit
  49. GRB 050326: Early observations with Swift-UVOT
  50. GRB 050326 XMM-Newton observation
  51. GRB 050326 : Planned XMM-Newton observation
  52. GRB 050326: Swift XRT Position
  53. GRB050326: optical limit 33min before GRB
  54. GRB 050326 BAT refined analysis
  55. GRB050326: delayed XRT observation
  56. Swift-BAT detection of a bright GRB 050326
  57. GRB050319, optical observations
  58. GRB050319, color indices
  59. GRB050319: RTT150 Optical Observations
  60. Swift-BAT detection of a bright outburst from SGR1806-20
  61. Swift-BAT trigger 112060 is not a real GRB
  62. GRB 050319: ROTSE-III Refined Analysis
  63. GRB 050318: Swift-BAT refined analysis
  64. Refined Swift XRT positions for GRB050315, GRB050318 and GRB050319
  65. GRB 050319 R band observations
  66. GRB 050319: Swift-UVOT detection of the afterglow
  67. GRB 050315: Variability Analysis of Swift BAT Time History
  68. GRB050319: BR optical photometry
  69. GRB 050318: SWIFT-UVOT refined analysis
  70. GRB 050319: Swift-BAT refined analysis
  71. GRB050319,optical observation
  72. Swift Detection of GRB 050319
  73. GRB 050319: Detection of Possible Optical Counterpart
  74. GRB 050318: Swift/UVOT detection of afterglow emission
  75. GRB050318: Swift XRT position
  76. Swift-BAT detection of GRB 050318
  77. GRB050223: analysis of the XMM-Newton observation
  78. GRB 050306: ROTSE-III early limits
  79. GRB 050315: Swift-BAT further refined analysis
  80. GRB050315: Swift-BAT Refined analysis
  81. Non-detection of GRB050315 in ATCA Radio Observations
  82. GRB 050315: Swift XRT Position
  83. GRB 050315: Early Observations with Swift/UVOT
  84. Swift-BAT detection of GRB 050315
  85. GRB050223: No XMM-Newton OM detection of afterglow emission
  86. GRB050309: CONCAM pre-trigger and trigger coincident optical
  87. GRB 050126: Redshift determination
  88. Swift-BAT trigger 107873: No Swift XRT counterpart
  89. GRB 050306: Confirmation of X-ray afterglow
  90. GRB 050309, Early optical limits from RAPTOR
  91. Swift-BAT trigger 107873 (GRB050309): possible X-ray counterparts
  92. GRB 050309 : Lulin R-band observation
  93. Swift 107873: P60 Optical Observations
  94. GRB 050306: CORRECTION to date of observation
  95. GRB 050306: No Swift UVOT Optical Counterpart Detected
  96. GRB 050306: Possible X-ray Afterglow Position from the Swift
  97. Swift trigger 107518: optical observation
  98. GRB 050306,optical observation
  99. GRB 050306: Swift-BAT detection of a long burst
  100. GRB050215B: Late-Time Swift UVOT Observations

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