Skip to main content
Updates to LVK & CHIME Notices, Schema v7.2.3! 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"

28055 results found.

  1. GRB991216
  2. GRB 991216--Summary of RXTE Observations
  3. GRB 991216 Optical Observations
  4. GRB 991216, optical observations
  5. GRB 991208 SAO-RAS Spectroscopy
  6. SAX J2303.2+0015: an x-ray/GRB?
  7. GRB 991216, Optical Transient
  8. GRB991216 ('Beethoven Burst') B, R, and K Observations
  9. GRB991216, infrared observations
  10. GRB 991208 optical observations
  11. GRB 991216 Optical Observation
  12. GRB 991216: Extremely bright BATSE burst
  13. R-band Observations of GRB991208 at TNG
  14. GRB991208, optical observations
  15. GRB 991208, Optical Observation
  16. GRB991208, optical observations
  17. GRB 991208 optical observations
  18. Optical Observations of GRB991105
  19. GRB991106: BeppoSAX/BATSE results
  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. GRB 991106 Optical Observations
  26. GRB991106, optical observation at SAO-RAS
  27. GRB 991106, LOTIS Optical Observations
  28. GRB991105: SAX-GRBM/-WFC detection
  29. GRB 991014 - X-ray afterglow identification by BeppoSAX-NFI
  30. GRB 991014, Optical Observations
  31. GRB 991014 - BeppoSAX NFI observations
  32. GRB 991014, radio observations
  33. GRB 991014, Optical Observations
  34. GRB 991014, optical observations
  35. GRB 990915 optical observations
  36. Optical Observations of GRB990907
  37. GRB990907: BeppoSAX follow up and X-ray afterglow
  38. GRB990907 and 990908
  39. GRB 990712 Late Optical Decay and Host Galaxy
  40. GRB990806 BeppoSAX follow up
  41. GRB990806: BATSE Observations
  42. GRB 990806 Optical observations
  43. GRB 990806, Optical Observations
  44. GRB 990806, optical observations
  45. GRB 990806, Optical Observations
  46. GRB990806 UBVRIJHK observations
  47. GRB 990712 Optical Observations
  48. GRB 990712
  49. Late-time HST/STIS Observations of GRB 990510
  50. BeppoSAX NFI Observation of GRB990705
  51. BeppoSAX NFI Observation of GRB990705
  52. GRB 990705, R-band observations
  53. Infrared and Optical Observations of GRB990705
  54. GRB990704: SAX-NFI results summary
  55. GRB990704 radio and optical observations
  56. GRB990704
  57. GRB990704, optical observations
  58. BeppoSAX NFI Observation of GRB990627 X-ray afterglow
  59. Optical Observations of GRB990627
  60. BeppoSAX: GRB990625
  61. Late-time HST/STIS Observation of GRB 990123
  62. Optical Observations of GRB 990506
  63. GRB990527 Optical Observations
  64. X-ray/GRB 1SAX J0835.9+5118, Optical Observation
  65. Late Afterglows of GRBs 990510, 990123
  66. X-ray/GRB 1SAX J0835.9+5118, TNG V and R observations
  67. X-ray/GRB 1SAX J0835.9+5118, BATSE Observation
  68. X-ray/GRB 1SAX J0835.9+5118, Optical Observations
  69. X-ray/GRB 1SAX J0835.9+5118, Optical Observation
  70. X-ray/GRB 1SAX J0835.9+5118, Optical Observation
  71. X-ray/GRB 1SAX J0835.9+5118, Optical Observation
  72. radio observations of X-ray/GRB transient field
  73. optical observation of the X-ray/GRB transient SAX J0835.9+5118
  74. Optical report on X-ray/GRB transient
  75. radio detection of X-ray/GRB transient
  76. BeppoSAX: A new fast X-ray transient
  77. GRB 990510: optical observations
  78. GRB 990510: optical linear polarization
  79. GRB 990510: optical observations
  80. GRB990510: X-ray afterglow
  81. GRB 990510: Broad Band Break
  82. GRB 990510: BATSE Observations
  83. GRB 990510: BeppoSAX/GRBM observations
  84. GRB990510 optical observations
  85. GRB 990510 optical observations
  86. GRB 990506 Radio Observations
  87. GRB 990123, optical monitoring
  88. GRB 990506: BATSE Observations
  89. GRB 990506, optical observations
  90. GRB 990506, Optical Observations
  91. GRB 990506 optical observations
  92. GRB 990506, optical observations
  93. GRB 990506, armchair astronomy
  94. GRB 990506, optical observations from +1 to +3 hours
  95. GRB 990506, optical observations
  96. GRB990506 observation plan
  97. IPN localization for GRB990506
  98. GRB990323 PRECISE IPN POSITION
  99. GRB 990316 Optical Observations
  100. GRB 990316 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