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"

36789 results found.

  1. GRB 991216: Comparison with DPOSS images
  2. GRB 991208 optical observations
  3. Lowell/Perkins observation of GRB 991216
  4. GRB 991216 Optical Observation
  5. GRB 991208 Keck Spectroscopy
  6. GRB 991216: Extremely bright BATSE burst
  7. GRB991208, optical observations
  8. GRB 991208 Keck Spectroscopy
  9. GRB991208 - millimeter detection
  10. GRB 991208, Optical Observation
  11. GRB 991208 - OVRO detection
  12. GRB 991208 Optical Decay
  13. GRB 991208 optical observations
  14. GRB 991208 optical observations
  15. GRB 991208: Radio Observations
  16. IPN localization of GRB991208
  17. Optical Observations of GRB991105
  18. GRB991106: BeppoSAX/BATSE results
  19. GRB 991106, optical observations
  20. GRB991106, near-infrared observations
  21. BeppoSAX NFI Observation of GRB991106
  22. GRB 991106, radio observations
  23. GRB991106: the first BeppoSAX short GRB detection?
  24. GRB 991105: BATSE Observations
  25. IPN localization of GRB991105
  26. GRB 991106 Optical Observations
  27. GRB 991105, optical observations
  28. GRB991106, optical observation at SAO-RAS
  29. GRB 991106, LOTIS Optical Observations
  30. GRB 991106, optical observations
  31. BeppoSAX GRB Alert: GRB991106
  32. BeppoSAX MAIL n. 99/30: GRB991105 refined position (fwd)
  33. GRB ALERT: GRB991105
  34. GRB 991014 - X-ray afterglow identification by BeppoSAX-NFI
  35. GRB 991014, Optical Observations
  36. GRB 991014 - BeppoSAX NFI observations
  37. GRB 991014, Optical Observations
  38. GRB 991014, radio observations
  39. GRB991014 BATSE Observations
  40. GRB 991014, Optical Observations
  41. GRB 991014, optical observations
  42. Super-LOTIS optical observation of GRB991014
  43. IPN/NFI error box for GRB991014
  44. IPN localization of GRB991014 - CORRECTION
  45. IPN localization of GRB991014
  46. BeppoSAX ALERT: GRB991014
  47. GRB 990915 optical observations
  48. GRB 990907 optical observations
  49. BATSE GRB trigger criteria
  50. Optical Observations of GRB990907
  51. IPN error box for GRB990915 (=BATSE 7766)
  52. IPN localization of BATSE #7766 (GRB990915)
  53. IPN localization of GRB990907
  54. GRB990908, another BeppoSAX-GRBM/WFC burst detection
  55. BeppoSAX MAIL n. 99/24: GRB ALERT: GRB990907
  56. GRB 990712 Late Optical Decay and Host Galaxy
  57. GRB 990712, Optical Observation
  58. GRB990806: BATSE Observations
  59. GRB 990806 Optical observations
  60. Optical Observations of GRB990806
  61. GRB 990806, Optical Observations
  62. GRB 990806, optical observations
  63. GRB 990806, Optical Observations
  64. GRB990806 UBVRIJHK observations
  65. BeppoSAX ALERT GRB990806: Summer GRB
  66. GRB 990712 Optical Observations
  67. GRB990705: No Evidence for Neutrino Signal
  68. GRB 990712 Optical Decay: Indication of Bright Host Galaxy
  69. VLT spectrum of GRB990712
  70. GRB 990712
  71. Late-time HST/STIS Observations of GRB 990510
  72. Refined BeppoSAX-WFC position of GRB990712
  73. GRB 990705, R-band observations
  74. Updated IPN localization of GRB990705
  75. IPN localization of GRB990704
  76. IPN localization of GRB990705
  77. Infrared and Optical Observations of GRB990705
  78. GRB 990705, radio observations
  79. GRB990704 radio and optical observations
  80. GRB 990704 X-ray Observations
  81. GRB 990704 Optical Observations
  82. GRB 990704, optical observations
  83. GRB990704
  84. GRB990705: Intriguing Positional Coincidences
  85. GRB990704
  86. GRB990704, optical observations
  87. Identification of a possible optical counterpart for GRB990704
  88. GRB990704
  89. Refined BeppoSAX-WFC position of GRB990704
  90. GRB990704: BeppoSAX detection
  91. Optical Observations of GRB990627
  92. GRB 990627, radio observations
  93. GRB990627: BeppoSAX-WFC final location
  94. BeppoSAX: GRB990625
  95. Late-time HST/STIS Observation of GRB 990123
  96. GRB 990506 - clarification to GCN 352
  97. GRB 990506 - Optical Observations
  98. Optical Observations of GRB 990506
  99. GRB 990506 Radio Transient
  100. GRB990527 Optical Observations

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