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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"

45493 results found.

  1. GRB010921: Spectroscopy of the Host Galaxy
  2. GRB 010921: The afterglow of HETE #1761
  3. Optical Observations of the field of HETE trigger #1793/GRB 011012?
  4. Optical Observations of the field of HETE trigger #1793/GRB 011012?
  5. GRB010923 as seen by BeppoSAX GRBM
  6. GRB010928(=H1770): Localization of a Long GRB by HETE
  7. GRB010923(=H1764): A Short Duration GRB Detected by HETE
  8. GRB010921, negative optical observations
  9. GRB010921 field photometry
  10. GRB010921 Optical Observations
  11. GRB 010921 DPOSS Images Available
  12. IPN triangulation of GRB010921 (=H1761)
  13. H1761: A Bright GRB Detected by HETE
  14. HETE Trigger #1760 (GRB 010920B?): new optical source = asteroid
  15. HETE Trigger #1760 (GRB 010920B?): a new optical source
  16. HETE Trigger #1759 (GRB 010920?) optical observations
  17. GRB001109, Host Galaxy Astrometry
  18. GRB000926, Host Galaxy Observations
  19. GRB001109, Host Galaxy Spectroscopic Observations
  20. Probable SGR or Short Duration GRB Detected by HETE
  21. GRB000926 Host Galaxy Observations
  22. GRB 010222: HST observations -- host galaxy and late-time decay
  23. BeppoSAX/GRBM detection of GRB 010801
  24. GCN and HETE status
  25. Dramatic Increase in the Rate of X-ray Bursts Reported by HETE
  26. BeppoSAX/GRBM detection of GRB010728
  27. GRB 010222 - WHT BVRI images
  28. SGR1900+14 burst seen by HETE: BeppoSAX data
  29. GRB 010629 Optical Observations
  30. GRB010629: Optical Observations
  31. SGR1900+14: High Fluence Burst Localized by HETE
  32. GRB010629, optical observations
  33. IPN triangulation of GRB010629
  34. GRB010629: A Burst Localized by HETE
  35. SGR1900+14: Second Burst Localized by HETE
  36. SGR1900+14: A Burst Localized by HETE
  37. Possible burst from SGR1806-20
  38. IPN detection of SGR1900+14
  39. SGR1806-20: A Second, Intense Burst Localized by HETE
  40. GRB 00630: Host Galaxy
  41. SGR1806-20: Localization by HETE
  42. IPN triangulation of GRB010613
  43. IPN triangulation of GRB010612
  44. IPN triangulation of GRB010612
  45. HETE Fully-Automated GCN Notices
  46. GRB000301C: Late-time HST/STIS observation
  47. GRB010518: a faint BeppoSAX detection
  48. GRB000418: HST/STIS Second-epoch Observations
  49. X-ray precursors to the large flare from SGR 1900+14
  50. GRB010214, optical observations
  51. GRB010427, Gamma Ray Observations
  52. SGR 1900+14: No evidence of extended X-ray emission
  53. SGR 1900+14 : RXTE observations
  54. BeppoSAX/NFI Follow-up Observation of SGR 1900+14
  55. SGR1900+14
  56. SGR 1900+14: Correction to GCN 1049
  57. GRB 010222 /corrections to VBT data
  58. Millimeter observation of SGR 1900+14
  59. SGR 1900+14: Detection of extended X-ray emission
  60. Chandra Observations of SGR 1900+14
  61. SGR 1900+14, Chandra observations
  62. Chandra Observations of SGR 1900+14
  63. Possible precursor to the SGR1900+14 giant burst
  64. SGR1900+14, I-band observations
  65. IPN Triangulation of the Giant Flare from SGR1900+14
  66. GRB010412, field photometry
  67. Giant flare from SGR1900+14
  68. GRB 010326b Optical Observations
  69. GRB010412: Optical observations
  70. GRB010412: Optical observations
  71. GRB010412: BeppoSAX GRBM and WFC observations
  72. IPN Triangulation of GRB010412
  73. BeppoSAX GRB: extension of BSAX operations upto April 30, 2002
  74. BeppoSAX GRB ALERT: GRB010412
  75. GRB Observation Report
  76. GRB010324, revised field photometry
  77. REVISED LOCATION OF GRB010326A
  78. GRB 980326: Late-time HST/STIS observations
  79. GRB010324, field photometry
  80. GRB010326B, field photometry
  81. GRB010326, field photometry
  82. GRB010220, field photometry
  83. Further Optical Observations of GRB 010324
  84. GRB010222, CXO X-ray observations
  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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