Skip to main content
New! Super-Kamiokande JSON Notices and Schema v4.5.0. 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"

26144 results found.

  1. GRB 991216: Extremely bright BATSE burst
  2. R-band Observations of GRB991208 at TNG
  3. GRB991208, optical observations
  4. GRB 991208, Optical Observation
  5. GRB991208, optical observations
  6. GRB 991208 optical observations
  7. Optical Observations of GRB991105
  8. GRB991106: BeppoSAX/BATSE results
  9. GRB991106, near-infrared observations
  10. BeppoSAX NFI Observation of GRB991106
  11. GRB 991106, radio observations
  12. GRB991106: the first BeppoSAX short GRB detection?
  13. GRB 991105: BATSE Observations
  14. GRB 991106 Optical Observations
  15. GRB991106, optical observation at SAO-RAS
  16. GRB 991106, LOTIS Optical Observations
  17. GRB991105: SAX-GRBM/-WFC detection
  18. GRB 991014 - X-ray afterglow identification by BeppoSAX-NFI
  19. GRB 991014, Optical Observations
  20. GRB 991014 - BeppoSAX NFI observations
  21. GRB 991014, radio observations
  22. GRB 991014, Optical Observations
  23. GRB 991014, optical observations
  24. GRB 990915 optical observations
  25. Optical Observations of GRB990907
  26. GRB990907: BeppoSAX follow up and X-ray afterglow
  27. GRB990907 and 990908
  28. GRB 990712 Late Optical Decay and Host Galaxy
  29. GRB990806 BeppoSAX follow up
  30. GRB990806: BATSE Observations
  31. GRB 990806 Optical observations
  32. GRB 990806, Optical Observations
  33. GRB 990806, optical observations
  34. GRB 990806, Optical Observations
  35. GRB990806 UBVRIJHK observations
  36. GRB 990712 Optical Observations
  37. GRB 990712
  38. Late-time HST/STIS Observations of GRB 990510
  39. BeppoSAX NFI Observation of GRB990705
  40. BeppoSAX NFI Observation of GRB990705
  41. GRB 990705, R-band observations
  42. Infrared and Optical Observations of GRB990705
  43. GRB990704: SAX-NFI results summary
  44. GRB990704 radio and optical observations
  45. GRB990704
  46. GRB990704, optical observations
  47. BeppoSAX NFI Observation of GRB990627 X-ray afterglow
  48. Optical Observations of GRB990627
  49. BeppoSAX: GRB990625
  50. Late-time HST/STIS Observation of GRB 990123
  51. Optical Observations of GRB 990506
  52. GRB990527 Optical Observations
  53. X-ray/GRB 1SAX J0835.9+5118, Optical Observation
  54. Late Afterglows of GRBs 990510, 990123
  55. X-ray/GRB 1SAX J0835.9+5118, TNG V and R observations
  56. X-ray/GRB 1SAX J0835.9+5118, BATSE Observation
  57. X-ray/GRB 1SAX J0835.9+5118, Optical Observations
  58. X-ray/GRB 1SAX J0835.9+5118, Optical Observation
  59. X-ray/GRB 1SAX J0835.9+5118, Optical Observation
  60. X-ray/GRB 1SAX J0835.9+5118, Optical Observation
  61. radio observations of X-ray/GRB transient field
  62. optical observation of the X-ray/GRB transient SAX J0835.9+5118
  63. Optical report on X-ray/GRB transient
  64. radio detection of X-ray/GRB transient
  65. BeppoSAX: A new fast X-ray transient
  66. GRB 990510: optical observations
  67. GRB 990510: optical linear polarization
  68. GRB 990510: optical observations
  69. GRB990510: X-ray afterglow
  70. GRB 990510: Broad Band Break
  71. GRB 990510: BATSE Observations
  72. GRB 990510: BeppoSAX/GRBM observations
  73. GRB990510 optical observations
  74. GRB 990510 optical observations
  75. GRB 990506 Radio Observations
  76. GRB 990123, optical monitoring
  77. GRB 990506: BATSE Observations
  78. GRB 990506, optical observations
  79. GRB 990506, Optical Observations
  80. GRB 990506 optical observations
  81. GRB 990506, optical observations
  82. GRB 990506, armchair astronomy
  83. GRB 990506, optical observations from +1 to +3 hours
  84. GRB 990506, optical observations
  85. GRB990506 observation plan
  86. IPN localization for GRB990506
  87. GRB990323 PRECISE IPN POSITION
  88. GRB 990316 Optical Observations
  89. GRB 990316 optical observations
  90. GRB990316: simultaneous optical observation
  91. GRB990316 - Optical null results
  92. GRB990308 not a new SGR
  93. GRB 990308a and GRB 990308b
  94. GRB990308, Possible new SGR~0209+70
  95. GRB 990123, Field Photometry
  96. GRB 990217 Optical Observations
  97. BATSE Flight Anomaly
  98. GRB990217: BeppoSAX/GRBM data
  99. GRB990123 observations
  100. GRB990217 Optical observation

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