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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').

22285 results found.

  1. GRB000210: BeppoSAX GRBM and WFC Detection
  2. SAX_WFC_GRB_NOTICE
  3. SAX_WFC_GRB_NOTICE
  4. GRB000201 Optical Observations
  5. GRB 000201: TAROT optical observations
  6. GRB 991208, radio observations
  7. BATSE+IPN location of GRB000131
  8. IPN localization of GRB000131
  9. GRB 000126, optical observations
  10. BATSE Observations of GRB000115
  11. Second RXTE Observation of GRB 000115
  12. GRB991216, UBVRIJHK field photometry
  13. GCN resumes full operations
  14. GRB 991216 VLBA Observations
  15. GRB 991216: J band spectrophotometry
  16. GRB 991216: Detection of the Host and/or Absorber Galaxy
  17. IPN localization of GRB991226
  18. GRB 991216 RXTE ASM Observations
  19. GRB 991216: Updated BATSE parameters
  20. GRB 991217 (SAX J2303.2+0015) Optical observations
  21. Chandra observation of the X-ray afterglow of GRB991216
  22. GRB 991216, optical observations
  23. GRB 991216 Optical spectroscopy/imaging
  24. SAX J2303.2+0015 Optical observations
  25. IR observations of GRB991216
  26. GRB 991217 (SAX J2303.2+0015) Optical observations
  27. GRB991216 Optical and infrared observations of Beethoven Burst
  28. GRB 991216 Radio Observations
  29. GRB 991208 Keck Spectroscopy
  30. GRB 991208 Infrared Detection
  31. GRB991216
  32. GRB 991216--Summary of RXTE Observations
  33. GRB 991216 Optical Observations
  34. GRB 991216, optical observations
  35. GRB 991208 SAO-RAS Spectroscopy
  36. SAX J2303.2+0015: an x-ray/GRB?
  37. GRB 991216, Optical Transient
  38. GRB991216 ('Beethoven Burst') B, R, and K Observations
  39. GRB991216, infrared observations
  40. GRB 991208 optical observations
  41. GRB 991216 Optical Observation
  42. GRB 991216: Extremely bright BATSE burst
  43. R-band Observations of GRB991208 at TNG
  44. GRB991208, optical observations
  45. GRB 991208, Optical Observation
  46. GRB991208, optical observations
  47. GRB 991208 optical observations
  48. Optical Observations of GRB991105
  49. GRB991106: BeppoSAX/BATSE results
  50. GRB991106, near-infrared observations
  51. BeppoSAX NFI Observation of GRB991106
  52. GRB 991106, radio observations
  53. GRB991106: the first BeppoSAX short GRB detection?
  54. GRB 991105: BATSE Observations
  55. GRB 991106 Optical Observations
  56. GRB991106, optical observation at SAO-RAS
  57. GRB 991106, LOTIS Optical Observations
  58. GRB991105: SAX-GRBM/-WFC detection
  59. GRB 991014 - X-ray afterglow identification by BeppoSAX-NFI
  60. GRB 991014, Optical Observations
  61. GRB 991014 - BeppoSAX NFI observations
  62. GRB 991014, radio observations
  63. GRB 991014, Optical Observations
  64. GRB 991014, optical observations
  65. GRB 990915 optical observations
  66. Optical Observations of GRB990907
  67. GRB990907: BeppoSAX follow up and X-ray afterglow
  68. GRB990907 and 990908
  69. GRB 990712 Late Optical Decay and Host Galaxy
  70. GRB990806 BeppoSAX follow up
  71. GRB990806: BATSE Observations
  72. GRB 990806 Optical observations
  73. GRB 990806, Optical Observations
  74. GRB 990806, optical observations
  75. GRB 990806, Optical Observations
  76. GRB990806 UBVRIJHK observations
  77. GRB 990712 Optical Observations
  78. GRB 990712
  79. Late-time HST/STIS Observations of GRB 990510
  80. BeppoSAX NFI Observation of GRB990705
  81. BeppoSAX NFI Observation of GRB990705
  82. GRB 990705, R-band observations
  83. Infrared and Optical Observations of GRB990705
  84. GRB990704: SAX-NFI results summary
  85. GRB990704 radio and optical observations
  86. GRB990704
  87. GRB990704, optical observations
  88. BeppoSAX NFI Observation of GRB990627 X-ray afterglow
  89. Optical Observations of GRB990627
  90. BeppoSAX: GRB990625
  91. Late-time HST/STIS Observation of GRB 990123
  92. Optical Observations of GRB 990506
  93. GRB990527 Optical Observations
  94. X-ray/GRB 1SAX J0835.9+5118, Optical Observation
  95. Late Afterglows of GRBs 990510, 990123
  96. X-ray/GRB 1SAX J0835.9+5118, TNG V and R observations
  97. X-ray/GRB 1SAX J0835.9+5118, BATSE Observation
  98. X-ray/GRB 1SAX J0835.9+5118, Optical Observations
  99. X-ray/GRB 1SAX J0835.9+5118, Optical Observation
  100. X-ray/GRB 1SAX J0835.9+5118, Optical Observation

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