Skip to main content
New! BOOM Notices and Schema v7.0.0. See news and announcements

GCN Circulars

GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. 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"

15714 results found.

  1. HETE Trigger #1759 (GRB 010920?) optical observations
  2. GRB000926, Host Galaxy Observations
  3. Probable SGR or Short Duration GRB Detected by HETE
  4. GRB000926 Host Galaxy Observations
  5. GRB 010222 - WHT BVRI images
  6. GRB 010629 Optical Observations
  7. GRB010629: Optical Observations
  8. SGR1900+14: High Fluence Burst Localized by HETE
  9. GRB010629, optical observations
  10. GRB010629: A Burst Localized by HETE
  11. SGR1900+14: Second Burst Localized by HETE
  12. SGR1900+14: A Burst Localized by HETE
  13. SGR1806-20: A Second, Intense Burst Localized by HETE
  14. GRB 00630: Host Galaxy
  15. SGR1806-20: Localization by HETE
  16. GRB000301C: Late-time HST/STIS observation
  17. GRB000418: HST/STIS Second-epoch Observations
  18. GRB010214, optical observations
  19. SGR 1900+14 : RXTE observations
  20. GRB010412, field photometry
  21. GRB 010326b Optical Observations
  22. GRB010412: Optical observations
  23. GRB010412: Optical observations
  24. GRB010324, revised field photometry
  25. GRB010326B, field photometry
  26. GRB010326, field photometry
  27. Further Optical Observations of GRB 010324
  28. GRB010222, CXO X-ray observations
  29. GRB 010326A: Further optical observations
  30. GRB 010326B: Optical observations
  31. GRB010324, optical observations
  32. GRB010326B: Localization by HETE (2nd GRB for this date)
  33. GRB 010326: Optical observations
  34. GRB 010326 optical observations
  35. GRB010326: Refined Localization by HETE
  36. GRB010326: Localization by HETE
  37. Optical Observations of GRB 010324
  38. GRB010222, late-time optical observation
  39. GRB010222 - Optical observation
  40. GRB 010222, Optical Observations
  41. GRB010220 optical obsercations
  42. GRB010222 - Optical observation
  43. GRB 010222: High-Resolution Keck Spectroscopy
  44. GRB010222: Optical observation and decay
  45. GRB 010214, I-band data
  46. Sub-millimeter Excess/GRB 010222
  47. GRB 010222 HST/Chandra TOO
  48. GRB 010222
  49. GRB010222: R-band data
  50. GRB010222 Optical observations
  51. GRB 010222: Keck Spectroscopy
  52. GRB010222, possible increase of optical decay slope
  53. GRB 010222 Kyoto optical observation
  54. GRB010222: fading behavior
  55. GRB 010222 BV optical observations
  56. GRB010220, Optical Observations
  57. GRB010214 follow-up from Hanle
  58. GRB 010222: Near-IR Observations
  59. GRB 010222: Optical Observations
  60. GRB 010222, Decay Slope Confirmed
  61. GRB010222: Another absorption line system
  62. GRB010222: Optical decay slope
  63. GRB 010214, Optical Observations
  64. GRB010222: Sub-millimeter detection
  65. GRB010222: R-band fading behavior
  66. GRB010222: Optical Observations
  67. GRB010222, radio observations
  68. GRB010222, optical observations
  69. GRB010222: BeppoSAX/NFI Observations
  70. Redshift of the Optical Transient of GRB010222
  71. GRB010222: possible optical counterpart
  72. GRB010222
  73. GRB010220, Radio and Optical Observations
  74. GRB 010220, simultaneous optical observations
  75. GRB010214, candidate optical afterglow
  76. GRB010214, optical observations
  77. GRB 010214, Optical Observations
  78. GRB 010214 optical observation
  79. GRB010213 Optical Observation
  80. GRB010213, Radio Observations
  81. GRB010214, optical observations
  82. GRB010213, optical observations
  83. GRB010214 Optical Observation
  84. GRB 010214, optical observations
  85. GRB010213 detected by HETE
  86. HETE Status
  87. GRB010126: CONCAM crude optical limits during GRB
  88. GRB010126, TNG R-band observations
  89. GRB010126 Optical Observations
  90. GRB010126 optical observations
  91. GRB010126: Optical observations
  92. GRB 010119, optical observations
  93. GRB010119: Optical observations
  94. Optical Observations of GRB 001018 at Keck
  95. Optical observations of GRB 001018 with JCAM
  96. GRB010103, optical observations
  97. GRB 001212 Optical Observation
  98. GRB 001212 Optical Observation
  99. GRB 001212 optical observation
  100. GRB 001212 possible OA in 2MASS

Advanced

Download all Circulars as a .tar.gz archive:
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