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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"

32551 results found.

  1. GRB000326 Optical Observations
  2. GRB000301C - Addendum to GCN 623
  3. GRB000326, Further VLA observations
  4. GRB 000323, optical observations
  5. GRB 000326: Optical Observations
  6. GRB000326, Radio observations
  7. GRB 000307 optical observations
  8. Single error box for GRB000315
  9. GRB000313, Radio observations
  10. GRB000301C - B and R photometry
  11. GRB 000307, Optical Observations
  12. GRB 000301C: Optical Spectrum and Redshift
  13. GRB 000301C: Optical Spectrum and Redshift
  14. GRB 000301C: A Precise Redshift Determination
  15. GRB 000301C, Optical Observation
  16. GRB 000301C: HST/STIS-PRISM NUV-MAMA spectroscopy
  17. GRB 000301C: HST/STIS CCD Imaging of the field
  18. GRB000301C, optical R-band observations
  19. GRB000301c - R photometry and nearby faint source confirmation
  20. GRB 000301C, Optical Observation
  21. GRB 000301C Optical Observations
  22. GRB 000301C: K' Observations
  23. GRB000301C OT candidate optical observations
  24. Optical observations of GRB000301c
  25. GRB000301C, Radio observations
  26. GRB000301C, Radio observations
  27. GRB000301C, near-infrared observations (JHK' imaging)
  28. GRB 000301C, Optical Color
  29. GRB 000301C, UBVRI field photometry
  30. GRB 000301C, Optical Observation
  31. GRB000301C, optical observations
  32. GRB000301C 250 GHz detection
  33. GRB 000301C R-band observation
  34. GRB 000301C, Optical Observation
  35. GRB000301C, near-infrared observations (JHK' photometry)
  36. GRB 000301C: OT confirmed
  37. GRB000301c optical observations
  38. GRB 000301A, Radio Observations
  39. GRB000301C, optical observations
  40. GRB000301c, near-infrared observations
  41. GRB000301C
  42. GRB 000301C : Optical Candidate
  43. Radio observations of the error box of GRB000301A
  44. HST Observations of GRB 990712
  45. GRB 000115 Optical observations
  46. GRB 000214, Radio Observations
  47. GRB 000214 ``Valentine's Day Burst'': BeppoSAX NFI Observation
  48. GRB000210, Radio Observations
  49. Correction to GCN 557 (GRB000214: BeppoSAX GRBM and WFC Detection)
  50. IPN annulus for GRB000214
  51. Optical observations of GRB000210
  52. GRB000210 X-ray afterglow
  53. GRB 000210: BATSE Observations
  54. Correction to Chandra Position of GRB000210 afterglow
  55. Optical observations of the Chandra X-ray source for GRB000210
  56. GRB000210, Radio Observations
  57. Optical candidate for GRB000210
  58. Chandra Observations of GRB000210 X-ray Afterglow
  59. IPN triangulation of GRB000210
  60. GRB000201, Radio Observations
  61. Optical observations of GRB000131
  62. GRB000201 Optical Observations
  63. GRB 000131 Optical Observations
  64. GRB000126 Optical Observations
  65. GRB 991208, radio observations
  66. BATSE+IPN location of GRB000131
  67. GRB 000126, optical observations
  68. GRB000126, optical observations
  69. BATSE location of GRB000126
  70. GRB 000115 Optical observations
  71. BATSE Observations of GRB000115
  72. Correction to GCN 520 (IPN annulus for GRB000115)
  73. IPN annulus for GRB000115
  74. GRB991216, UBVRIJHK field photometry
  75. GRB991216 late optical observation
  76. Single IPN error box for GRB991229
  77. GCN resumes full operations
  78. GRB 991216 VLBA Observations
  79. BEPPOSAX GRBM Localization of GRB991226
  80. GRB 991216: J band spectrophotometry
  81. GRB 991216: Detection of the Host and/or Absorber Galaxy
  82. Single IPN error box for GRB991221
  83. GRB 991216 RXTE ASM Observations
  84. IPN error box for GRB991216
  85. Lowell/Perkins observation of GRB 991216
  86. GRB 991217 (SAX J2303.2+0015) Optical observations
  87. GRB991217/SAX J2303.2+0015, optical observations
  88. Chandra observation of the X-ray afterglow of GRB991216
  89. GRB 991216, optical observations
  90. GRB 991216 Optical Observations
  91. GRB 991216 Optical spectroscopy/imaging
  92. VLT spectra of GRB991216
  93. GRB991216 Optical and IR observations
  94. SAX J2303.2+0015 Optical observations
  95. IR observations of GRB991216
  96. GRB991216 radio observations
  97. GRB 991217 (SAX J2303.2+0015) Optical observations
  98. GRB991216 radio observations
  99. Lowell/Perkins observation of GRB 991216
  100. GRB991216, optical observations

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Download all Circulars as a .tar.gz archive (updated once a day):
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