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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"

19215 results found.

  1. GRB010921 - Milagro GeV/TeV Observations
  2. GRB011121: UBRI Observations
  3. XRF011030: Chandra Observations
  4. GRB011030: Z-band observations
  5. GRB 011030 R band observations
  6. GRB 011030 I-band Observation
  7. The X-ray Flash 011030 ('GRB 011030')
  8. Non-triggered burst 011030 ("GRB 011030")
  9. The Radio Afterglow from the X-ray Rich GRB 011030
  10. GRB 010921: HST Detection of the Afterglow and Host Galaxy
  11. Optical observation of SGR 1806-20 at the 6-m SAO telescope
  12. GRB 011030 I-band Observations
  13. GRB 011030 K-band Observations
  14. GRB010921, optical observations
  15. GRB011030 - further refinement WFC position
  16. GRB 011030, Radio observations
  17. GRB011019: A Faint, X-ray Rich GRB localized by HETE
  18. GRB 010921: The afterglow of HETE #1761
  19. Optical Observations of the field of HETE trigger #1793/GRB 011012?
  20. GRB010923 as seen by BeppoSAX GRBM
  21. GRB010928(=H1770): Localization of a Long GRB by HETE
  22. GRB010923(=H1764): A Short Duration GRB Detected by HETE
  23. H1761: A Bright GRB Detected by HETE
  24. Probable SGR or Short Duration GRB Detected by HETE
  25. GCN and HETE status
  26. Dramatic Increase in the Rate of X-ray Bursts Reported by HETE
  27. GRB 010222 - WHT BVRI images
  28. SGR1900+14 burst seen by HETE: BeppoSAX data
  29. GRB010629: Optical Observations
  30. SGR1900+14: High Fluence Burst Localized by HETE
  31. GRB010629: A Burst Localized by HETE
  32. SGR1900+14: Second Burst Localized by HETE
  33. SGR1900+14: A Burst Localized by HETE
  34. Possible burst from SGR1806-20
  35. SGR1806-20: A Second, Intense Burst Localized by HETE
  36. SGR1806-20: Localization by HETE
  37. HETE Fully-Automated GCN Notices
  38. GRB000301C: Late-time HST/STIS observation
  39. GRB010518: a faint BeppoSAX detection
  40. X-ray precursors to the large flare from SGR 1900+14
  41. GRB010427, Gamma Ray Observations
  42. SGR 1900+14: No evidence of extended X-ray emission
  43. SGR 1900+14 : RXTE observations
  44. BeppoSAX/NFI Follow-up Observation of SGR 1900+14
  45. SGR 1900+14: Correction to GCN 1049
  46. GRB 010222 /corrections to VBT data
  47. Millimeter observation of SGR 1900+14
  48. SGR 1900+14: Detection of extended X-ray emission
  49. Chandra Observations of SGR 1900+14
  50. SGR 1900+14, Chandra observations
  51. SGR1900+14, I-band observations
  52. Giant flare from SGR1900+14
  53. GRB010412: BeppoSAX GRBM and WFC observations
  54. IPN Triangulation of GRB010412
  55. REVISED LOCATION OF GRB010326A
  56. GRB 980326: Late-time HST/STIS observations
  57. GRB010222, CXO X-ray observations
  58. GRB010326: Localization by HETE
  59. Duration, ECT, peak flux and fluence of GRB010324
  60. Support extension to the BeppoSAX mission
  61. GRB 010222 - HEGRA GeV/TeV Observations
  62. GRB010222: Chandra X-ray Observatory Observation
  63. GRB010222: Sub-millimeter vanishing act
  64. GRB010222 - Optical observation
  65. GRB010222 - Optical observation
  66. GRB 010222: High-Resolution Keck Spectroscopy
  67. GRB 010214, I-band data
  68. GRB 010222
  69. GRB010222: R-band data
  70. GRB010222, possible increase of optical decay slope
  71. GRB 010222: Optical Observations
  72. GRB010222: Optical decay slope
  73. GRB 010214, Optical Observations
  74. GRB010222: BeppoSAX/NFI Observations
  75. GRB010214B,Gamma Ray Observations
  76. GRB 010220, simultaneous optical observations
  77. GRB010214, candidate optical afterglow
  78. GRB 010214: X-Ray afterglow
  79. GRB010213, Radio Observations
  80. GRB 010214, optical observations
  81. IPN Status Report
  82. HETE Status
  83. IPN/RXTE TRIANGULATION OF GRB010126
  84. GRB010126 Optical Observations
  85. IPN TRIANGULATION OF GRB010126
  86. IPN/RXTE TRIANGULATION OF GRB010126
  87. Optical Observations of GRB 001018 at Keck
  88. IPN TRIANGULATION OF GRB010119 (SHORT/HARD)
  89. IPN TRIANGULATION OF GRB010115
  90. IPN TRIANGULATION OF GRB010109
  91. IPN TRIANGULATION OF GRB010109
  92. IPN triangulation of GRB010104
  93. IPN triangulation of GRB010103
  94. H band observation of GRB 001212
  95. GRB & BeppoSAX: ground operations restored back to 24 hrs a day
  96. IPN triangulation of GRB001219
  97. GRB 001212 Optical Observation
  98. GRB 001212 possible OA in 2MASS
  99. IPN triangulation of GRB001212
  100. Confirmation of IPN position for GRB001204

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