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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').

24224 results found.

  1. GRB 000307, BVRI Field Photometry
  2. GRB 000301C: A Precise Redshift Determination
  3. GRB 000301C, Optical Observation
  4. GRB 000301C: HST/STIS CCD Imaging of the field
  5. IPN error box for GRB000307
  6. GRB000301C, optical R-band observations
  7. GRB 000301C Optical Observations
  8. GRB 000301C: K' Observations
  9. GRB000301C OT candidate optical observations
  10. GRB000301C - Host galaxy not detected in R (?)
  11. Optical observations of GRB000301c
  12. GRB000301C, Radio observations
  13. GRB000301C, Radio observations
  14. GRB000301C, near-infrared observations (JHK' imaging)
  15. GRB 000301c near-IR observations
  16. GRB 000301C, UBVRI field photometry
  17. GRB 000301C: OT confirmed
  18. GRB000301c optical observations
  19. GRB000301C, optical observations
  20. GRB000301C
  21. GRB 000301C : Optical Candidate
  22. GRB000301C: RXTE/ASM and IPN localizations
  23. GRB000226 [IPN Position]
  24. HST Observations of GRB 990712
  25. GRB 000214 near-IR observations
  26. GRB 000214 ``Valentine's Day Burst'': BeppoSAX NFI Observation
  27. GRB000210, Radio Observations
  28. GRB 000115, BVRI field photometry
  29. GRB000214: BeppoSAX GRBM and WFC Detection
  30. Optical observations of GRB000210
  31. GRB000210 X-ray afterglow
  32. GRB000214: X-ray afterglow candidate
  33. GRB000214 refined BeppoSAX-WFC position
  34. GRB 000210: BATSE Observations
  35. Optical observations of the Chandra X-ray source for GRB000210
  36. GRB000210, Radio Observations
  37. IPN triangulation of GRB000210
  38. GRB000210: possible afterglow detection with BeppoSAX NFI
  39. GRB000201, Radio Observations
  40. GRB000210: BeppoSAX GRBM and WFC Detection
  41. SAX_WFC_GRB_NOTICE
  42. SAX_WFC_GRB_NOTICE
  43. GRB000201 Optical Observations
  44. GRB 000201: TAROT optical observations
  45. GRB 991208, radio observations
  46. BATSE+IPN location of GRB000131
  47. IPN localization of GRB000131
  48. GRB 000126, optical observations
  49. BATSE Observations of GRB000115
  50. Second RXTE Observation of GRB 000115
  51. GRB991216, UBVRIJHK field photometry
  52. GCN resumes full operations
  53. GRB 991216 VLBA Observations
  54. GRB 991216: J band spectrophotometry
  55. GRB 991216: Detection of the Host and/or Absorber Galaxy
  56. IPN localization of GRB991226
  57. GRB 991216 RXTE ASM Observations
  58. GRB 991216: Updated BATSE parameters
  59. GRB 991217 (SAX J2303.2+0015) Optical observations
  60. Chandra observation of the X-ray afterglow of GRB991216
  61. GRB 991216, optical observations
  62. GRB 991216 Optical spectroscopy/imaging
  63. SAX J2303.2+0015 Optical observations
  64. IR observations of GRB991216
  65. GRB 991217 (SAX J2303.2+0015) Optical observations
  66. GRB991216 Optical and infrared observations of Beethoven Burst
  67. GRB 991216 Radio Observations
  68. GRB 991208 Keck Spectroscopy
  69. GRB 991208 Infrared Detection
  70. GRB991216
  71. GRB 991216--Summary of RXTE Observations
  72. GRB 991216 Optical Observations
  73. GRB 991216, optical observations
  74. GRB 991208 SAO-RAS Spectroscopy
  75. SAX J2303.2+0015: an x-ray/GRB?
  76. GRB 991216, Optical Transient
  77. GRB991216 ('Beethoven Burst') B, R, and K Observations
  78. GRB991216, infrared observations
  79. GRB 991208 optical observations
  80. GRB 991216 Optical Observation
  81. GRB 991216: Extremely bright BATSE burst
  82. R-band Observations of GRB991208 at TNG
  83. GRB991208, optical observations
  84. GRB 991208, Optical Observation
  85. GRB991208, optical observations
  86. GRB 991208 optical observations
  87. Optical Observations of GRB991105
  88. GRB991106: BeppoSAX/BATSE results
  89. GRB991106, near-infrared observations
  90. BeppoSAX NFI Observation of GRB991106
  91. GRB 991106, radio observations
  92. GRB991106: the first BeppoSAX short GRB detection?
  93. GRB 991105: BATSE Observations
  94. GRB 991106 Optical Observations
  95. GRB991106, optical observation at SAO-RAS
  96. GRB 991106, LOTIS Optical Observations
  97. GRB991105: SAX-GRBM/-WFC detection
  98. GRB 991014 - X-ray afterglow identification by BeppoSAX-NFI
  99. GRB 991014, Optical Observations
  100. GRB 991014 - BeppoSAX NFI observations

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