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"

43849 results found.

  1. GRB 050406: Swift XRT Position
  2. Swift-BAT detection of GRB 050406
  3. Konus-Wind observation of GRB 050401
  4. GRB050401: Radio observation at 610 MHz with GMRT
  5. GRB050401, radio observation at 4.8 GHz and 8.64 GHz
  6. GRB 050401: VLT spectroscopic redshift
  7. GRB 050401 Optical Observations
  8. GRB 050401 BAT refined analysis
  9. Very questionable identity of Swift-BAT GRB050402 (Trig=113225)
  10. GRB050401: TNG R-band observation
  11. GRB 050402A: IR Analysis
  12. GRB050402: XDSS counterpart
  13. GRB 050402A: IR Observations
  14. GRB 050402: Early observations with Swift-UVOT
  15. GRB050401: ROTSE-III Detection of Prompt Optical Counterpart
  16. GRB 050401: Optical afterglow confirmed
  17. GRB 050401: Optical afterglow candidate
  18. Swift-BAT detection of GRB 050401
  19. GRB 050401: Prompt XRT position
  20. Retraction of three Swift GRB triggers
  21. GRB050331: No Afterglow Detected
  22. Swift-BAT detection of GRB 050331b
  23. GRB 050331: Swift UVOT Source
  24. Swift-BAT detection of GRB 050331
  25. GRB 050331: Swift XRT Position
  26. Swift Data Publicly Available Starting April 5, 2005
  27. GRB050319: radio observation
  28. Konus-Wind observation of GRB 050326
  29. GRB050326: optical limit
  30. GRB 050326: Early observations with Swift-UVOT
  31. GRB 050326 XMM-Newton observation
  32. GRB 050326: Swift XRT Position
  33. GRB 050326 BAT refined analysis
  34. GRB050326: delayed XRT observation
  35. Swift-BAT detection of a bright GRB 050326
  36. GRB050319, optical observations
  37. GRB050319, color indices
  38. GRB050319: optical observation, March 20-22
  39. GRB050319: RTT150 Optical Observations
  40. Swift-BAT detection of a bright outburst from SGR1806-20
  41. Swift-BAT trigger 112060 is not a real GRB
  42. GRB 050319: Absorption redshift from the Nordic Optical Telescope
  43. GRB 050319: ROTSE-III Refined Analysis
  44. GRB 050318: Swift-BAT refined analysis
  45. Refined Swift XRT positions for GRB050315, GRB050318 and GRB050319
  46. GRB050319: VLA Observations
  47. GRB 050319 R band observations
  48. GRB 050319: Swift-UVOT detection of the afterglow
  49. GRB 050315: Variability Analysis of Swift BAT Time History
  50. GRB050319: Radio Observations
  51. GRB 050319: NIR afterglow candidate
  52. GRB 050319:Near IR afterglow
  53. GRB050319: BR optical photometry
  54. GRB 050318: SWIFT-UVOT refined analysis
  55. GRB 050318: Absorption redshift from Magellan
  56. GRB 050319: Swift-BAT refined analysis
  57. GRB050319,optical observation
  58. Swift Detection of GRB 050319
  59. GRB 050319: Detection of Possible Optical Counterpart
  60. GRB 050318: Swift/UVOT detection of afterglow emission
  61. GRB 050318: Magellan optical afterglow identification
  62. GRB050318: Swift XRT position
  63. RXTE Observations of GRB050318
  64. Swift-BAT detection of GRB 050318
  65. GRB 050315, SMARTS optical afterglow decay
  66. GRB050223: analysis of the XMM-Newton observation
  67. GRB050316: MASTER before, simultanious and follow up optical
  68. GRB 050306: ROTSE-III early limits
  69. GRB 050315: Swift-BAT further refined analysis
  70. GRB 050315 I-band observations
  71. GRB050315: Radio afterglow
  72. GRB 050315: Absorption redshift
  73. GRB 050315: Optical afterglow identification
  74. GRB050315: Swift-BAT Refined analysis
  75. Non-detection of GRB050315 in ATCA Radio Observations
  76. GRB 050315: Swift XRT Position
  77. GRB 050219b: Gemini/GNIRS near-infrared spectroscopy
  78. GRB 050315: Early Observations with Swift/UVOT
  79. Swift-BAT detection of GRB 050315
  80. GRB050223: No XMM-Newton OM detection of afterglow emission
  81. GRB 050306: Radio Observations
  82. GRB050306: 250 GHz upper limit with MAMBO at the IRAM 30m
  83. GRB050309: CONCAM pre-trigger and trigger coincident optical
  84. GRB 050306: optical afterglow
  85. GRB 050126: Redshift determination
  86. Swift-BAT trigger 107873: No Swift XRT counterpart
  87. GRB 050306: Confirmation of X-ray afterglow
  88. GRB 050309, Early optical limits from RAPTOR
  89. GRB 050306: further TAROT optical data
  90. GRB050309: Early optical limit from P60
  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: R-band observations
  96. GRB 050306: No Swift UVOT Optical Counterpart Detected
  97. GRB 050306: REM optical-infrared observations
  98. GRB 050306: Possible X-ray Afterglow Position from the Swift
  99. Swift trigger 107518: optical observation
  100. GRB 050306: TAROT optical 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