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GCN Circulars

GCN Circulars are rapid bulletins submitted by and distributed to the community. 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"
  1. IR observations of GRB991216
  2. GRB991216 radio observations
  3. GRB 991217 (SAX J2303.2+0015) Optical observations
  4. GRB991216 radio observations
  5. GRB991216 Spectroscopy
  6. Lowell/Perkins observation of GRB 991216
  7. GRB991216, optical observations
  8. GRB991216 Optical and infrared observations of Beethoven Burst
  9. Refined IPN localization of GRB991216
  10. GRB 991216 Radio Observations
  11. GRB 991217
  12. GRB 991208 Keck Spectroscopy
  13. GRB 991208 Infrared Detection
  14. GRB991216
  15. GRB 991216--Summary of RXTE Observations
  16. GRB 991216 Optical Observations
  17. GRB 991216, optical observations
  18. GRB 991208 SAO-RAS Spectroscopy
  19. SAX J2303.2+0015: an x-ray/GRB?
  20. GRB 991216, Optical Transient
  21. GRB 991216, Optical Afterglow
  22. GRB991216 ('Beethoven Burst') B, R, and K Observations
  23. GRB 991216: Comparison with DPOSS images
  24. GRB991216, infrared observations
  25. GRB991216 Optical Observations
  26. GRB 991208 optical observations
  27. Lowell/Perkins observation of GRB 991216
  28. GRB 991216 Optical Observation
  29. GRB 991208 Keck Spectroscopy
  30. GRB 991216: Extremely bright BATSE burst
  31. R-band Observations of GRB991208 at TNG
  32. GRB991208, optical observations
  33. GRB 991208 Keck Spectroscopy
  34. GRB991208 - millimeter detection
  35. GRB 991208, Optical Observation
  36. GRB991208 15-GHz observations
  37. GRB991208, optical observations
  38. GRB 991208 - OVRO detection
  39. GRB 991208 Optical Decay
  40. GRB 991208 optical observations
  41. GRB 991208 optical observations
  42. GRB 991208: Radio Observations
  43. IPN localization of GRB991208
  44. Optical Observations of GRB991105
  45. GRB991106: BeppoSAX/BATSE results
  46. GRB 991106, optical observations
  47. GRB991106, near-infrared observations
  48. BeppoSAX NFI Observation of GRB991106
  49. GRB 991106, radio observations
  50. GRB991106: the first BeppoSAX short GRB detection?
  51. GRB 991105: BATSE Observations
  52. IPN localization of GRB991105
  53. GRB 991106 Optical Observations
  54. GRB 991105, optical observations
  55. GRB991106, optical observation at SAO-RAS
  56. GRB 991106, LOTIS Optical Observations
  57. GRB 991106, optical observations
  58. BeppoSAX refined position for GRB991106
  59. BeppoSAX GRB Alert: GRB991106
  60. Revised BeppoSAX WFC position of GRB991105
  61. GRB991105: SAX-GRBM/-WFC detection
  62. BeppoSAX MAIL n. 99/30: GRB991105 refined position (fwd)
  63. GRB ALERT: GRB991105
  64. GRB 991014 - X-ray afterglow identification by BeppoSAX-NFI
  65. GRB 991014, Optical Observations
  66. GRB 991014 - BeppoSAX NFI observations
  67. GRB 991014, Optical Observations
  68. GRB 991014, radio observations
  69. GRB991014 BATSE Observations
  70. GRB 991014, Optical Observations
  71. GRB 991014, optical observations
  72. Super-LOTIS optical observation of GRB991014
  73. IPN/NFI error box for GRB991014
  74. IPN localization of GRB991014 - CORRECTION
  75. IPN localization of GRB991014
  76. BeppoSAX ALERT: GRB991014
  77. GRB 990915 optical observations
  78. GRB 990907 optical observations
  79. BATSE GRB trigger criteria
  80. Optical Observations of GRB990907
  81. IPN error box for GRB990915 (=BATSE 7766)
  82. IPN localization of BATSE #7766 (GRB990915)
  83. GRB990907: BeppoSAX follow up and X-ray afterglow
  84. GRB990907 and 990908
  85. IPN localization of GRB990907
  86. GRB990908, another BeppoSAX-GRBM/WFC burst detection
  87. GRB990907: refined WFC position
  88. BeppoSAX MAIL n. 99/24: GRB ALERT: GRB990907
  89. GRB 990712 Late Optical Decay and Host Galaxy
  90. GRB 990712, Optical Observation
  91. GRB990806 BeppoSAX follow up
  92. GRB990806: BATSE Observations
  93. GRB 990806 Optical observations
  94. Optical Observations of GRB990806
  95. GRB 990806, Optical Observations
  96. GRB 990806, optical observations
  97. GRB 990806, Optical Observations
  98. GRB990806 UBVRIJHK observations
  99. GRB990806: possible X-ray afterglow, BeppoSAX
  100. BeppoSAX ALERT GRB990806: Summer GRB

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