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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"

26352 results found.

  1. GRB 000115 Optical observations
  2. GRB 000214 ``Valentine's Day Burst'': BeppoSAX NFI Observation
  3. GRB000210, Radio Observations
  4. IPN annulus for GRB000214
  5. GRB000210 X-ray afterglow
  6. BeppoSAX GRB000214 ("S. Valentine's day GRB")
  7. GRB 000210: BATSE Observations
  8. Correction to Chandra Position of GRB000210 afterglow
  9. Optical observations of the Chandra X-ray source for GRB000210
  10. GRB000210, Radio Observations
  11. Optical candidate for GRB000210
  12. IPN triangulation of GRB000210
  13. GRB000201, Radio Observations
  14. Optical observations of GRB000131
  15. GRB000201 Optical Observations
  16. GRB 000131 Optical Observations
  17. BATSE+IPN location of GRB000131
  18. IPN localization of GRB000131
  19. GRB 000126, optical observations
  20. GRB000126, optical observations
  21. BATSE location of GRB000126
  22. BATSE Observations of GRB000115
  23. GRB991216, UBVRIJHK field photometry
  24. GRB991216 late optical observation
  25. Single IPN error box for GRB991229
  26. GCN resumes full operations
  27. GRB 991216 VLBA Observations
  28. GRB 991216: J band spectrophotometry
  29. GRB 991216: Detection of the Host and/or Absorber Galaxy
  30. Lowell/Perkins observation of GRB 991216
  31. GRB 991217 (SAX J2303.2+0015) Optical observations
  32. GRB 991216 Optical spectroscopy/imaging
  33. GRB991216 Optical and IR observations
  34. SAX J2303.2+0015 Optical observations
  35. IR observations of GRB991216
  36. GRB991216 radio observations
  37. GRB 991217 (SAX J2303.2+0015) Optical observations
  38. GRB991216 radio observations
  39. GRB991216, optical observations
  40. GRB991216 Optical and infrared observations of Beethoven Burst
  41. Refined IPN localization of GRB991216
  42. GRB 991216 Radio Observations
  43. GRB 991208 Keck Spectroscopy
  44. GRB991216
  45. GRB 991216--Summary of RXTE Observations
  46. GRB 991216 Optical Observations
  47. GRB 991216, optical observations
  48. GRB 991216, Optical Transient
  49. GRB 991216, Optical Afterglow
  50. GRB991216 ('Beethoven Burst') B, R, and K Observations
  51. GRB 991216: Comparison with DPOSS images
  52. Lowell/Perkins observation of GRB 991216
  53. GRB 991208 Keck Spectroscopy
  54. GRB 991216: Extremely bright BATSE burst
  55. R-band Observations of GRB991208 at TNG
  56. GRB991208, optical observations
  57. GRB 991208 Keck Spectroscopy
  58. GRB991208 - millimeter detection
  59. GRB991208 15-GHz observations
  60. GRB991208, optical observations
  61. GRB 991208 Optical Decay
  62. GRB 991208 optical observations
  63. GRB 991208 optical observations
  64. IPN localization of GRB991208
  65. Optical Observations of GRB991105
  66. GRB991106: BeppoSAX/BATSE results
  67. GRB 991106, optical observations
  68. GRB991106, near-infrared observations
  69. BeppoSAX NFI Observation of GRB991106
  70. GRB 991105: BATSE Observations
  71. IPN localization of GRB991105
  72. GRB 991106 Optical Observations
  73. GRB 991105, optical observations
  74. GRB 991106, optical observations
  75. BeppoSAX GRB Alert: GRB991106
  76. BeppoSAX MAIL n. 99/30: GRB991105 refined position (fwd)
  77. GRB ALERT: GRB991105
  78. GRB 991014 - X-ray afterglow identification by BeppoSAX-NFI
  79. GRB 991014, radio observations
  80. GRB991014 BATSE Observations
  81. GRB 991014, optical observations
  82. IPN/NFI error box for GRB991014
  83. BeppoSAX ALERT: GRB991014
  84. GRB 990915 optical observations
  85. GRB 990907 optical observations
  86. GRB990907 and 990908
  87. GRB990908, another BeppoSAX-GRBM/WFC burst detection
  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. Optical Observations of GRB990806
  94. GRB 990806, Optical Observations
  95. BeppoSAX ALERT GRB990806: Summer GRB
  96. GRB 990712 Optical Observations
  97. GRB 990712 Optical Decay: Indication of Bright Host Galaxy
  98. Late-time HST/STIS Observations of GRB 990510
  99. Refined BeppoSAX-WFC position of GRB990712
  100. BeppoSAX NFI Observation of GRB990705

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