Skip to main content
Testing. You are viewing the public testing version of GCN. For the production version, go to https://gcn.nasa.gov.
Introducing Einstein Probe, Astro Flavored Markdown, and Notices Schema v4.0.0. 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').
  1. GRB 991208 - OVRO detection
  2. GRB 991208 Optical Decay
  3. GRB 991208 optical observations
  4. GRB 991208 optical observations
  5. GRB 991208: Radio Observations
  6. IPN localization of GRB991208
  7. Optical Observations of GRB991105
  8. GRB991106: BeppoSAX/BATSE results
  9. GRB 991106, optical observations
  10. GRB991106, near-infrared observations
  11. BeppoSAX NFI Observation of GRB991106
  12. GRB 991106, radio observations
  13. GRB991106: the first BeppoSAX short GRB detection?
  14. GRB 991105: BATSE Observations
  15. IPN localization of GRB991105
  16. GRB 991106 Optical Observations
  17. GRB 991105, optical observations
  18. GRB991106, optical observation at SAO-RAS
  19. GRB 991106, LOTIS Optical Observations
  20. GRB 991106, optical observations
  21. BeppoSAX refined position for GRB991106
  22. BeppoSAX GRB Alert: GRB991106
  23. Revised BeppoSAX WFC position of GRB991105
  24. GRB991105: SAX-GRBM/-WFC detection
  25. BeppoSAX MAIL n. 99/30: GRB991105 refined position (fwd)
  26. GRB ALERT: GRB991105
  27. GRB 991014 - X-ray afterglow identification by BeppoSAX-NFI
  28. GRB 991014, Optical Observations
  29. GRB 991014 - BeppoSAX NFI observations
  30. GRB 991014, Optical Observations
  31. GRB 991014, radio observations
  32. GRB991014 BATSE Observations
  33. GRB 991014, Optical Observations
  34. GRB 991014, optical observations
  35. Super-LOTIS optical observation of GRB991014
  36. IPN/NFI error box for GRB991014
  37. IPN localization of GRB991014 - CORRECTION
  38. IPN localization of GRB991014
  39. BeppoSAX ALERT: GRB991014
  40. GRB 990915 optical observations
  41. GRB 990907 optical observations
  42. BATSE GRB trigger criteria
  43. Optical Observations of GRB990907
  44. IPN error box for GRB990915 (=BATSE 7766)
  45. IPN localization of BATSE #7766 (GRB990915)
  46. GRB990907: BeppoSAX follow up and X-ray afterglow
  47. GRB990907 and 990908
  48. IPN localization of GRB990907
  49. GRB990908, another BeppoSAX-GRBM/WFC burst detection
  50. GRB990907: refined WFC position
  51. BeppoSAX MAIL n. 99/24: GRB ALERT: GRB990907
  52. GRB 990712 Late Optical Decay and Host Galaxy
  53. GRB 990712, Optical Observation
  54. GRB990806 BeppoSAX follow up
  55. GRB990806: BATSE Observations
  56. GRB 990806 Optical observations
  57. Optical Observations of GRB990806
  58. GRB 990806, Optical Observations
  59. GRB 990806, optical observations
  60. GRB 990806, Optical Observations
  61. GRB990806 UBVRIJHK observations
  62. GRB990806: possible X-ray afterglow, BeppoSAX
  63. BeppoSAX ALERT GRB990806: Summer GRB
  64. GRB 990712 Optical Observations
  65. GRB990705: No Evidence for Neutrino Signal
  66. GRB 990712 Optical Decay: Indication of Bright Host Galaxy
  67. VLT spectrum of GRB990712
  68. GRB 990712
  69. Late-time HST/STIS Observations of GRB 990510
  70. Refined BeppoSAX-WFC position of GRB990712
  71. BeppoSAX NFI Observation of GRB990705
  72. BeppoSAX NFI Observation of GRB990705
  73. Updated Astrometry for the IR Counterpart of GRB990705
  74. GRB 990705, R-band observations
  75. Updated IPN localization of GRB990705
  76. IPN localization of GRB990704
  77. IPN localization of GRB990705
  78. Infrared and Optical Observations of GRB990705
  79. GRB 990705, radio observations
  80. GRB990704: SAX-NFI results summary
  81. GRB990704 radio and optical observations
  82. BeppoSAX GRB990705: possible X-ray afterglow
  83. GRB 990704 X-ray Observations
  84. GRB 990704 Optical Observations
  85. GRB 990704, optical observations
  86. GRB990704
  87. GRB990705: Intriguing Positional Coincidences
  88. GRB990704
  89. Refined BeppoSAX-WFC position of GRB990704: Errata Corrige
  90. GRB990704, optical observations
  91. GRB990704: possible X-ray afterglow
  92. Identification of a possible optical counterpart for GRB990704
  93. GRB990704
  94. Refined BeppoSAX-WFC position of GRB990704
  95. GRB990704: BeppoSAX detection
  96. BeppoSAX NFI Observation of GRB990627 X-ray afterglow
  97. Optical Observations of GRB990627
  98. GRB 990627, radio observations
  99. GRB990627: BeppoSAX-WFC final location
  100. BeppoSAX: GRB990625

Advanced

Download all Circulars as a .tar.gz archive:
Looking for U.S. government information and services? Visit USA.gov