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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"
  1. HETE Trigger #1760 (GRB 010920B?): new optical source = asteroid
  2. HETE Trigger #1760 (GRB 010920B?): a new optical source
  3. HETE Trigger #1759 (GRB 010920?) optical observations
  4. GRB001109, Host Galaxy Astrometry
  5. GRB000926, Host Galaxy Observations
  6. GRB001109, Host Galaxy Spectroscopic Observations
  7. Probable SGR or Short Duration GRB Detected by HETE
  8. GRB000926 Host Galaxy Observations
  9. GRB 010222: HST observations -- host galaxy and late-time decay
  10. BeppoSAX/GRBM detection of GRB 010801
  11. GCN and HETE status
  12. Dramatic Increase in the Rate of X-ray Bursts Reported by HETE
  13. BeppoSAX/GRBM detection of GRB010728
  14. GRB 010222 - WHT BVRI images
  15. SGR1900+14 burst seen by HETE: BeppoSAX data
  16. GRB 010629 Optical Observations
  17. GRB010629: Optical Observations
  18. SGR1900+14: High Fluence Burst Localized by HETE
  19. GRB010629, optical observations
  20. IPN triangulation of GRB010629
  21. GRB010629: A Burst Localized by HETE
  22. SGR1900+14: Second Burst Localized by HETE
  23. SGR1900+14: A Burst Localized by HETE
  24. Possible burst from SGR1806-20
  25. IPN detection of SGR1900+14
  26. SGR1806-20: A Second, Intense Burst Localized by HETE
  27. GRB 00630: Host Galaxy
  28. SGR1806-20: Localization by HETE
  29. IPN triangulation of GRB010613
  30. IPN triangulation of GRB010612
  31. IPN triangulation of GRB010612
  32. HETE Fully-Automated GCN Notices
  33. GRB000301C: Late-time HST/STIS observation
  34. GRB010518: a faint BeppoSAX detection
  35. GRB000418: HST/STIS Second-epoch Observations
  36. X-ray precursors to the large flare from SGR 1900+14
  37. GRB010214, optical observations
  38. GRB010427, Gamma Ray Observations
  39. SGR 1900+14: No evidence of extended X-ray emission
  40. SGR 1900+14 : RXTE observations
  41. BeppoSAX/NFI Follow-up Observation of SGR 1900+14
  42. SGR1900+14 - correction
  43. SGR1900+14
  44. SGR 1900+14: Correction to GCN 1049
  45. GRB 010222 /corrections to VBT data
  46. Millimeter observation of SGR 1900+14
  47. SGR 1900+14: Detection of extended X-ray emission
  48. Chandra Observations of SGR 1900+14
  49. SGR 1900+14, Chandra observations
  50. Chandra Observations of SGR 1900+14
  51. Possible precursor to the SGR1900+14 giant burst
  52. SGR1900+14, I-band observations
  53. IPN Triangulation of the Giant Flare from SGR1900+14
  54. GRB010412, field photometry
  55. Giant flare from SGR1900+14
  56. GRB 010326b Optical Observations
  57. GRB010412: Optical observations
  58. GRB010412: Optical observations
  59. GRB010412: BeppoSAX GRBM and WFC observations
  60. IPN Triangulation of GRB010412
  61. GRB010412: refined positions from BeppoSAX
  62. BeppoSAX GRB: extension of BSAX operations upto April 30, 2002
  63. BeppoSAX GRB ALERT: GRB010412
  64. GRB Observation Report
  65. GRB010324, revised field photometry
  66. REVISED LOCATION OF GRB010326A
  67. GRB 980326: Late-time HST/STIS observations
  68. GRB010324, field photometry
  69. GRB010326B, field photometry
  70. GRB010326, field photometry
  71. GRB010220, field photometry
  72. Further Optical Observations of GRB 010324
  73. GRB010222, CXO X-ray observations
  74. GRB 010326A: Further optical observations
  75. GRB010324: BeppoSAX/GRBM data
  76. GRB 010326B: Optical observations
  77. GRB010324, optical observations
  78. GRB010326B: Localization by HETE (2nd GRB for this date)
  79. GRB 010326: Optical observations
  80. GRB 010326 optical observations
  81. GRB010326: Refined Localization by HETE
  82. GRB010326: Localization by HETE
  83. Duration, ECT, peak flux and fluence of GRB010324
  84. Optical Observations of GRB 010324
  85. IPN TRIANGULATION OF GRB010324
  86. GRB990705, VLT-FORS1 observations of the host galaxy
  87. GRB010222, late-time optical observation
  88. Support extension to the BeppoSAX mission
  89. GRB 010222 - HEGRA GeV/TeV Observations
  90. Congratulate Scott on the 1000th GRB Coordinates Network Circular!
  91. GRB010222: Chandra X-ray Observatory Observation
  92. GRB010222: Sub-millimeter vanishing act
  93. GRB010222 - Optical observation
  94. GRB 010222, Optical Observations
  95. GRB010220 optical obsercations
  96. GRB010222 - Optical observation
  97. GRB 010222: High-Resolution Keck Spectroscopy
  98. GRB010222: Optical observation and decay
  99. GRB 010214, I-band data
  100. Sub-millimeter Excess/GRB 010222

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