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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').

23953 results found.

  1. GRB 991216 Optical Observations
  2. GRB 991216, optical observations
  3. GRB 991208 SAO-RAS Spectroscopy
  4. SAX J2303.2+0015: an x-ray/GRB?
  5. GRB 991216, Optical Transient
  6. GRB991216 ('Beethoven Burst') B, R, and K Observations
  7. GRB991216, infrared observations
  8. GRB 991208 optical observations
  9. GRB 991216 Optical Observation
  10. GRB 991216: Extremely bright BATSE burst
  11. R-band Observations of GRB991208 at TNG
  12. GRB991208, optical observations
  13. GRB 991208, Optical Observation
  14. GRB991208, optical observations
  15. GRB 991208 optical observations
  16. Optical Observations of GRB991105
  17. GRB991106: BeppoSAX/BATSE results
  18. GRB991106, near-infrared observations
  19. BeppoSAX NFI Observation of GRB991106
  20. GRB 991106, radio observations
  21. GRB991106: the first BeppoSAX short GRB detection?
  22. GRB 991105: BATSE Observations
  23. GRB 991106 Optical Observations
  24. GRB991106, optical observation at SAO-RAS
  25. GRB 991106, LOTIS Optical Observations
  26. GRB991105: SAX-GRBM/-WFC detection
  27. GRB 991014 - X-ray afterglow identification by BeppoSAX-NFI
  28. GRB 991014, Optical Observations
  29. GRB 991014 - BeppoSAX NFI observations
  30. GRB 991014, radio observations
  31. GRB 991014, Optical Observations
  32. GRB 991014, optical observations
  33. GRB 990915 optical observations
  34. Optical Observations of GRB990907
  35. GRB990907: BeppoSAX follow up and X-ray afterglow
  36. GRB990907 and 990908
  37. GRB 990712 Late Optical Decay and Host Galaxy
  38. GRB990806 BeppoSAX follow up
  39. GRB990806: BATSE Observations
  40. GRB 990806 Optical observations
  41. GRB 990806, Optical Observations
  42. GRB 990806, optical observations
  43. GRB 990806, Optical Observations
  44. GRB990806 UBVRIJHK observations
  45. GRB 990712 Optical Observations
  46. GRB 990712
  47. Late-time HST/STIS Observations of GRB 990510
  48. BeppoSAX NFI Observation of GRB990705
  49. BeppoSAX NFI Observation of GRB990705
  50. GRB 990705, R-band observations
  51. Infrared and Optical Observations of GRB990705
  52. GRB990704: SAX-NFI results summary
  53. GRB990704 radio and optical observations
  54. GRB990704
  55. GRB990704, optical observations
  56. BeppoSAX NFI Observation of GRB990627 X-ray afterglow
  57. Optical Observations of GRB990627
  58. BeppoSAX: GRB990625
  59. Late-time HST/STIS Observation of GRB 990123
  60. Optical Observations of GRB 990506
  61. GRB990527 Optical Observations
  62. X-ray/GRB 1SAX J0835.9+5118, Optical Observation
  63. Late Afterglows of GRBs 990510, 990123
  64. X-ray/GRB 1SAX J0835.9+5118, TNG V and R observations
  65. X-ray/GRB 1SAX J0835.9+5118, BATSE Observation
  66. X-ray/GRB 1SAX J0835.9+5118, Optical Observations
  67. X-ray/GRB 1SAX J0835.9+5118, Optical Observation
  68. X-ray/GRB 1SAX J0835.9+5118, Optical Observation
  69. X-ray/GRB 1SAX J0835.9+5118, Optical Observation
  70. radio observations of X-ray/GRB transient field
  71. optical observation of the X-ray/GRB transient SAX J0835.9+5118
  72. Optical report on X-ray/GRB transient
  73. radio detection of X-ray/GRB transient
  74. BeppoSAX: A new fast X-ray transient
  75. GRB 990510: optical observations
  76. GRB 990510: optical linear polarization
  77. GRB 990510: optical observations
  78. GRB990510: X-ray afterglow
  79. GRB 990510: Broad Band Break
  80. GRB 990510: BATSE Observations
  81. GRB 990510: BeppoSAX/GRBM observations
  82. GRB990510 optical observations
  83. GRB 990510 optical observations
  84. GRB 990506 Radio Observations
  85. GRB 990123, optical monitoring
  86. GRB 990506: BATSE Observations
  87. GRB 990506, optical observations
  88. GRB 990506, Optical Observations
  89. GRB 990506 optical observations
  90. GRB 990506, optical observations
  91. GRB 990506, armchair astronomy
  92. GRB 990506, optical observations from +1 to +3 hours
  93. GRB 990506, optical observations
  94. GRB990506 observation plan
  95. IPN localization for GRB990506
  96. GRB990323 PRECISE IPN POSITION
  97. GRB 990316 Optical Observations
  98. GRB 990316 optical observations
  99. GRB990316: simultaneous optical observation
  100. GRB990316 - Optical null results

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