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"

32688 results found.

  1. GRB 050408: Inconsistency of host galaxy identification
  2. GRB 050408: Subaru Observations
  3. GRB 050408: WIDGET simultaneous optical observations
  4. GRB 050408: SOAR UBVRc Observations
  5. GRB 050408: Properties of the Host Galaxy
  6. GRB 050408: Mercator Optical Observations
  7. GRB050408: Radio Observations
  8. GRB 050408: Swift XRT analysis
  9. GRB 050408, SMARTS optical/IR afterglow observations
  10. GRB 050408: Optical limit at 20 min after the burst
  11. GRB 050408, optical observations
  12. GRB050408: REM NIR and Optical observation
  13. GRB 050408: Moderate-resolution Gemini Spectroscopy
  14. GRB 050408,optical observation
  15. GRB 050408 Optical Observations
  16. GRB 050408: Emission and absorption redshift
  17. GRB 050408: Mercator Optical Observations
  18. GRB 050408: Magellan astrometry and photometry
  19. GRB 050408: First Optical observations with TFOSC at the RTT150
  20. GRB 050408: steepening of the optical decay
  21. GRB 050408: Optical afterglow confirmed
  22. GRB 050408: opitcal observation
  23. GRB 050408, optical observations
  24. GRB 050408 optical candidate
  25. GRB 050408: Swift XRT Position
  26. GRB 050408: ROTSE-III Optical Limits
  27. GRB 050408 (=H3711): A Long X-Ray-Rich GRB Detected by HETE
  28. GRB050401: Radio Detection
  29. Swift-UVOT Optical Counterpart Candidate to XRF 050406
  30. GRB 050406: Magellan optical observations
  31. GRB 050406: early Swift XRT analysis results
  32. GRB 050406 BAT refined analysis
  33. GRB 050406: Early observations with Swift-UVOT
  34. GRB 050406: Swift XRT Position
  35. Konus-Wind observation of GRB 050401
  36. GRB050401: Radio observation at 610 MHz with GMRT
  37. GRB050401, radio observation at 4.8 GHz and 8.64 GHz
  38. GRB 050401: VLT spectroscopic redshift
  39. GRB 050401 Optical Observations
  40. GRB050401: Maidanak optical observation
  41. GRB 050401 BAT refined analysis
  42. GRB050401: TNG R-band observation
  43. GRB 050402A: IR Analysis
  44. GRB050402: XDSS counterpart
  45. GRB050401: ROTSE-III Detection of Prompt Optical Counterpart
  46. GRB 050401: Optical afterglow confirmed
  47. Swift-BAT detection of GRB 050401
  48. Retraction of three Swift GRB triggers
  49. GRB050331: No Afterglow Detected
  50. Swift-BAT detection of GRB 050331b
  51. GRB 050331: Swift UVOT Source
  52. Swift-BAT detection of GRB 050331
  53. Swift Data Publicly Available Starting April 5, 2005
  54. GRB050319: radio observation
  55. Konus-Wind observation of GRB 050326
  56. GRB050326: optical limit
  57. GRB 050326: Early observations with Swift-UVOT
  58. GRB 050326 XMM-Newton observation
  59. GRB 050326 : Planned XMM-Newton observation
  60. GRB 050326: Swift XRT Position
  61. GRB050326: optical limit 33min before GRB
  62. GRB 050326 BAT refined analysis
  63. GRB050326: delayed XRT observation
  64. Swift-BAT detection of a bright GRB 050326
  65. GRB050319, optical observations
  66. GRB050319, color indices
  67. GRB050319: optical observation, March 20-22
  68. GRB050319: RTT150 Optical Observations
  69. GRB 050319: Absorption redshift from the Nordic Optical Telescope
  70. GRB 050319: ROTSE-III Refined Analysis
  71. GRB 050318: Swift-BAT refined analysis
  72. GRB050319: VLA Observations
  73. GRB050319: radio observation
  74. GRB 050319 R band observations
  75. GRB 050319: Swift-UVOT detection of the afterglow
  76. GRB 050315: Variability Analysis of Swift BAT Time History
  77. GRB050319: Radio Observations
  78. GRB 050319: NIR afterglow candidate
  79. GRB 050319:Near IR afterglow
  80. GRB050319: BR optical photometry
  81. GRB 050318: SWIFT-UVOT refined analysis
  82. GRB 050318: Absorption redshift from Magellan
  83. GRB 050319: Optical observation
  84. GRB 050319: Swift-BAT refined analysis
  85. GRB050319,optical observation
  86. GRB 050318: Swift/UVOT detection of afterglow emission
  87. GRB 050318: Magellan optical afterglow identification
  88. GRB050318: Swift XRT position
  89. RXTE Observations of GRB050318
  90. GRB 050315, SMARTS optical afterglow decay
  91. GRB050223: analysis of the XMM-Newton observation
  92. GRB050316: MASTER before, simultanious and follow up optical
  93. GRB 050306: ROTSE-III early limits
  94. GRB 050315: Swift-BAT further refined analysis
  95. GRB 050315, SMARTS optical/IR afterglow observations
  96. GRB 050315 I-band observations
  97. GRB050315: Radio afterglow
  98. GRB 050315: Absorption redshift
  99. GRB 050315: Optical afterglow identification
  100. GRB050315: Swift-BAT Refined analysis

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