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"

16007 results found.

  1. Probable SGR or Short Duration GRB Detected by HETE
  2. GRB000926 Host Galaxy Observations
  3. GRB 010222 - WHT BVRI images
  4. GRB 010629 Optical Observations
  5. GRB010629: Optical Observations
  6. SGR1900+14: High Fluence Burst Localized by HETE
  7. GRB010629, optical observations
  8. GRB010629: A Burst Localized by HETE
  9. SGR1900+14: Second Burst Localized by HETE
  10. SGR1900+14: A Burst Localized by HETE
  11. SGR1806-20: A Second, Intense Burst Localized by HETE
  12. GRB 00630: Host Galaxy
  13. SGR1806-20: Localization by HETE
  14. GRB000418: HST/STIS Second-epoch Observations
  15. GRB010214, optical observations
  16. GRB010412, field photometry
  17. GRB 010326b Optical Observations
  18. GRB010412: Optical observations
  19. GRB010412: Optical observations
  20. GRB010324, revised field photometry
  21. GRB010326B, field photometry
  22. GRB010326, field photometry
  23. Further Optical Observations of GRB 010324
  24. GRB010222, CXO X-ray observations
  25. GRB 010326A: Further optical observations
  26. GRB 010326B: Optical observations
  27. GRB010324, optical observations
  28. GRB010326B: Localization by HETE (2nd GRB for this date)
  29. GRB 010326: Optical observations
  30. GRB 010326 optical observations
  31. GRB010326: Refined Localization by HETE
  32. GRB010326: Localization by HETE
  33. Optical Observations of GRB 010324
  34. GRB010222, late-time optical observation
  35. GRB010222 - Optical observation
  36. GRB 010222, Optical Observations
  37. GRB010220 optical obsercations
  38. GRB010222 - Optical observation
  39. GRB 010222: High-Resolution Keck Spectroscopy
  40. GRB010222: Optical observation and decay
  41. GRB 010214, I-band data
  42. GRB 010222 HST/Chandra TOO
  43. GRB 010222
  44. GRB010222: R-band data
  45. GRB010222 Optical observations
  46. GRB 010222: Keck Spectroscopy
  47. GRB010222, possible increase of optical decay slope
  48. GRB 010222 Kyoto optical observation
  49. GRB010222: fading behavior
  50. GRB 010222 BV optical observations
  51. GRB010220, Optical Observations
  52. GRB010214 follow-up from Hanle
  53. GRB 010222: Near-IR Observations
  54. GRB 010222: Optical Observations
  55. GRB 010222, Decay Slope Confirmed
  56. GRB010222: Another absorption line system
  57. GRB010222: Optical decay slope
  58. GRB 010214, Optical Observations
  59. GRB010222: Sub-millimeter detection
  60. GRB010222: R-band fading behavior
  61. GRB010222: Optical Observations
  62. GRB010222, radio observations
  63. GRB010222, optical observations
  64. GRB010222: BeppoSAX/NFI Observations
  65. Redshift of the Optical Transient of GRB010222
  66. GRB010222: possible optical counterpart
  67. GRB010222
  68. GRB010220, Radio and Optical Observations
  69. GRB 010220, simultaneous optical observations
  70. GRB010214, candidate optical afterglow
  71. GRB010214, optical observations
  72. GRB 010214, Optical Observations
  73. GRB 010214 optical observation
  74. GRB010213 Optical Observation
  75. GRB010213, Radio Observations
  76. GRB010214, optical observations
  77. GRB010213, optical observations
  78. GRB010214 Optical Observation
  79. GRB 010214, optical observations
  80. GRB010213 detected by HETE
  81. HETE Status
  82. GRB010126: CONCAM crude optical limits during GRB
  83. GRB010126, TNG R-band observations
  84. GRB010126 Optical Observations
  85. GRB010126 optical observations
  86. GRB010126: Optical observations
  87. GRB 010119, optical observations
  88. GRB010119: Optical observations
  89. Optical Observations of GRB 001018 at Keck
  90. Optical observations of GRB 001018 with JCAM
  91. GRB010103, optical observations
  92. GRB 001212 Optical Observation
  93. GRB 001212 Optical Observation
  94. GRB 001212 optical observation
  95. GRB 001212 possible OA in 2MASS
  96. GRB 001212 possible OA
  97. GRB001204: Optical observations
  98. GRB 001105, further optical observations
  99. GRB001120: Gunn-i observations
  100. GRB001120: 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