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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"

36194 results found.

  1. Non-triggered burst 011030 ("GRB 011030")
  2. The Radio Afterglow from the X-ray Rich GRB 011030
  3. GRB 010921: HST Detection of the Afterglow and Host Galaxy
  4. GRB 970828: HST Observations of the Host Galaxy
  5. GRB 000131: HST Detection of the Host Galaxy
  6. GRB 970828: HST Observations of the Host Galaxy
  7. GRB010921, optical observation
  8. GRB 011019 optical observation
  9. GRB011019: Subaru Optical Observations
  10. GRB 011030 I-band Observations
  11. GRB 011030 K-band Observations
  12. GRB010921, optical observations
  13. GRB 011030, WSRT radio observations
  14. GRB011030 - further refinement WFC position
  15. GRB 011030, Radio observations
  16. GRB 011030, R-band observations
  17. BeppoSAX ALERT: Possible X-ray rich GRB011030
  18. GRB 010921: Possible supernova component
  19. GRB011019: NEAT Optical Observations
  20. GRB010921, optical observation at early time
  21. GRB 010921, I-band observations
  22. GRB011019: Optical observations
  23. GRB011019, optical observations
  24. GRB011019: A Faint, X-ray Rich GRB localized by HETE
  25. GRB010921: Spectroscopy of the Host Galaxy
  26. GRB 010921: The afterglow of HETE #1761
  27. Optical Observations of the field of HETE trigger #1793/GRB 011012?
  28. Optical Observations of the field of HETE trigger #1793/GRB 011012?
  29. GRB010923 as seen by BeppoSAX GRBM
  30. GRB010928(=H1770): Localization of a Long GRB by HETE
  31. GRB010923(=H1764): A Short Duration GRB Detected by HETE
  32. GRB010921, negative optical observations
  33. GRB010921 field photometry
  34. GRB010921 Optical Observations
  35. GRB 010921 DPOSS Images Available
  36. IPN triangulation of GRB010921 (=H1761)
  37. H1761: A Bright GRB Detected by HETE
  38. HETE Trigger #1760 (GRB 010920B?): new optical source = asteroid
  39. HETE Trigger #1760 (GRB 010920B?): a new optical source
  40. HETE Trigger #1759 (GRB 010920?) optical observations
  41. GRB001109, Host Galaxy Astrometry
  42. GRB000926, Host Galaxy Observations
  43. GRB001109, Host Galaxy Spectroscopic Observations
  44. Probable SGR or Short Duration GRB Detected by HETE
  45. GRB000926 Host Galaxy Observations
  46. GRB 010222: HST observations -- host galaxy and late-time decay
  47. BeppoSAX/GRBM detection of GRB 010801
  48. Dramatic Increase in the Rate of X-ray Bursts Reported by HETE
  49. GRB 010222 - WHT BVRI images
  50. GRB 010629 Optical Observations
  51. GRB010629: Optical Observations
  52. GRB010629, optical observations
  53. IPN triangulation of GRB010629
  54. GRB010629: A Burst Localized by HETE
  55. Possible burst from SGR1806-20
  56. IPN detection of SGR1900+14
  57. GRB 00630: Host Galaxy
  58. IPN triangulation of GRB010613
  59. IPN triangulation of GRB010612
  60. HETE Fully-Automated GCN Notices
  61. GRB000301C: Late-time HST/STIS observation
  62. GRB010518: a faint BeppoSAX detection
  63. GRB000418: HST/STIS Second-epoch Observations
  64. GRB010427, Gamma Ray Observations
  65. SGR1900+14
  66. GRB 010222 /corrections to VBT data
  67. Possible precursor to the SGR1900+14 giant burst
  68. IPN Triangulation of the Giant Flare from SGR1900+14
  69. GRB010412, field photometry
  70. GRB 010326b Optical Observations
  71. GRB010412: Optical observations
  72. GRB010412: Optical observations
  73. IPN Triangulation of GRB010412
  74. BeppoSAX GRB: extension of BSAX operations upto April 30, 2002
  75. BeppoSAX GRB ALERT: GRB010412
  76. GRB Observation Report
  77. GRB010324, revised field photometry
  78. REVISED LOCATION OF GRB010326A
  79. GRB 980326: Late-time HST/STIS observations
  80. GRB010324, field photometry
  81. GRB010326B, field photometry
  82. GRB010326, field photometry
  83. GRB010220, field photometry
  84. Further Optical Observations of GRB 010324
  85. GRB 010326A: Further optical observations
  86. GRB010324: BeppoSAX/GRBM data
  87. GRB 010326B: Optical observations
  88. GRB010324, optical observations
  89. GRB010326B: Localization by HETE (2nd GRB for this date)
  90. GRB 010326: Optical observations
  91. GRB 010326 optical observations
  92. GRB010326: Refined Localization by HETE
  93. GRB010326: Localization by HETE
  94. Duration, ECT, peak flux and fluence of GRB010324
  95. Optical Observations of GRB 010324
  96. IPN TRIANGULATION OF GRB010324
  97. GRB990705, VLT-FORS1 observations of the host galaxy
  98. GRB010222, late-time optical observation
  99. Support extension to the BeppoSAX mission
  100. GRB 010222 - HEGRA GeV/TeV Observations

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