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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"

36310 results found.

  1. GRB 011121: HST Scheduled
  2. GRB011121: fainter still
  3. Correction: GCN1157 (GRB 011121)
  4. GRB 011121: Radio Observations
  5. GRB 011121 J-Band Astrometry
  6. GRB011121: continued decay
  7. GRB 011121: Detection of Bright IR Counterpart
  8. GRB011121: possible redshift, continued decay
  9. IPN triangulation of GRB011121
  10. BEPPOSAX GRB011121
  11. GRB 011030: TNG K-band observation
  12. XRF011030: Chandra Observations
  13. GRB 011030: K-band observations
  14. GRB 011030 R band observations
  15. GRB 011030 I-band Observation
  16. The X-ray Flash 011030 ('GRB 011030')
  17. Non-triggered burst 011030 ("GRB 011030")
  18. The Radio Afterglow from the X-ray Rich GRB 011030
  19. GRB 010921: HST Detection of the Afterglow and Host Galaxy
  20. GRB 970828: HST Observations of the Host Galaxy
  21. GRB 000131: HST Detection of the Host Galaxy
  22. GRB 970828: HST Observations of the Host Galaxy
  23. GRB010921, optical observation
  24. GRB 011019 optical observation
  25. GRB011019: Subaru Optical Observations
  26. GRB 011030 I-band Observations
  27. GRB 011030 K-band Observations
  28. GRB010921, optical observations
  29. GRB 011030, WSRT radio observations
  30. GRB011030 - further refinement WFC position
  31. GRB 011030, Radio observations
  32. GRB 011030, R-band observations
  33. BeppoSAX ALERT: Possible X-ray rich GRB011030
  34. GRB 010921: Possible supernova component
  35. GRB011019: NEAT Optical Observations
  36. GRB010921, optical observation at early time
  37. GRB 010921, I-band observations
  38. GRB011019: Optical observations
  39. GRB011019, optical observations
  40. GRB011019: A Faint, X-ray Rich GRB localized by HETE
  41. GRB010921: Spectroscopy of the Host Galaxy
  42. GRB 010921: The afterglow of HETE #1761
  43. Optical Observations of the field of HETE trigger #1793/GRB 011012?
  44. Optical Observations of the field of HETE trigger #1793/GRB 011012?
  45. GRB010923 as seen by BeppoSAX GRBM
  46. GRB010928(=H1770): Localization of a Long GRB by HETE
  47. GRB010923(=H1764): A Short Duration GRB Detected by HETE
  48. GRB010921, negative optical observations
  49. GRB010921 field photometry
  50. GRB010921 Optical Observations
  51. GRB 010921 DPOSS Images Available
  52. IPN triangulation of GRB010921 (=H1761)
  53. H1761: A Bright GRB Detected by HETE
  54. HETE Trigger #1760 (GRB 010920B?): new optical source = asteroid
  55. HETE Trigger #1760 (GRB 010920B?): a new optical source
  56. HETE Trigger #1759 (GRB 010920?) optical observations
  57. GRB001109, Host Galaxy Astrometry
  58. GRB000926, Host Galaxy Observations
  59. GRB001109, Host Galaxy Spectroscopic Observations
  60. Probable SGR or Short Duration GRB Detected by HETE
  61. GRB000926 Host Galaxy Observations
  62. GRB 010222: HST observations -- host galaxy and late-time decay
  63. BeppoSAX/GRBM detection of GRB 010801
  64. Dramatic Increase in the Rate of X-ray Bursts Reported by HETE
  65. GRB 010222 - WHT BVRI images
  66. GRB 010629 Optical Observations
  67. GRB010629: Optical Observations
  68. GRB010629, optical observations
  69. IPN triangulation of GRB010629
  70. GRB010629: A Burst Localized by HETE
  71. Possible burst from SGR1806-20
  72. IPN detection of SGR1900+14
  73. GRB 00630: Host Galaxy
  74. IPN triangulation of GRB010613
  75. IPN triangulation of GRB010612
  76. HETE Fully-Automated GCN Notices
  77. GRB000301C: Late-time HST/STIS observation
  78. GRB010518: a faint BeppoSAX detection
  79. GRB000418: HST/STIS Second-epoch Observations
  80. GRB010427, Gamma Ray Observations
  81. SGR1900+14
  82. GRB 010222 /corrections to VBT data
  83. Possible precursor to the SGR1900+14 giant burst
  84. IPN Triangulation of the Giant Flare from SGR1900+14
  85. GRB010412, field photometry
  86. GRB 010326b Optical Observations
  87. GRB010412: Optical observations
  88. GRB010412: Optical observations
  89. IPN Triangulation of GRB010412
  90. BeppoSAX GRB: extension of BSAX operations upto April 30, 2002
  91. BeppoSAX GRB ALERT: GRB010412
  92. GRB Observation Report
  93. GRB010324, revised field photometry
  94. REVISED LOCATION OF GRB010326A
  95. GRB 980326: Late-time HST/STIS observations
  96. GRB010324, field photometry
  97. GRB010326B, field photometry
  98. GRB010326, field photometry
  99. GRB010220, field photometry
  100. Further Optical Observations of GRB 010324

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