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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"

24621 results found.

  1. GRB 020322: BeppoSAX observations of the X-ray afterglow
  2. SN 2002ap - peak brightness date (SN/GRB?)
  3. GRB 020322 optical observations
  4. GRB 011121: Fourth Epoch of HST Imaging
  5. GRB020321: a faint BeppoSAX detection
  6. GRB 020317 : KISO Optical Observations
  7. GRB020317 (=H1959): Localization by HETE of a Low Fluence GRB
  8. GRB 020305: Optical Observations
  9. GRB020317, optical observations
  10. GRB 011121: Third HST Epoch
  11. GRB 011121: HST Observations reveal an intermediate-time multicolor
  12. GRB011121, possible supernova association
  13. XRF/GRB 011030: Detection of the Probable Host Galaxy
  14. GRB020305, optical observations
  15. IPN triangulation of GRB020305 (HETE 1939)
  16. GRB020305 (=H1939): Localization of a GRB by HETE
  17. HST Imaging of the afterglow and host of GRB 011121
  18. IPN detection and localization of Cygnus X-1 flares
  19. RXTE Observations of SGR 1900+14
  20. IPN detection of further SGR1900+14 activity
  21. SGR1900+14 activity
  22. IPN/HETE Detection of Bursts from SGR1900+14
  23. IPN Upper Limits to a GRB Associated With SN2002ap
  24. GRB020127: Palomar and VLA Observations of Possible Counterparts
  25. GRB020127: Comparison of Chandra Epochs and Identification of Possible Counterparts
  26. SN2002ap (SN/GRB?) Echelle spectra
  27. GRB020127 Optical Observations
  28. SN2002ap (SN/GRB?) UBVRI Field Photometry
  29. GRB020127: Chandra Observations and Prospective Counterparts
  30. GRB020124, optical observations
  31. IPN detection of further activity from SGR1806-20
  32. GRB020127(=H1902): Localization of a Double-Peaked GRB by HETE
  33. GRB020124: Optical observations
  34. IPN observations of SGR1806-20
  35. GRB 020124: Optical afterglow
  36. GRB020124(=H1896): Localization of a Long GRB by HETE
  37. GRB 011211, spectrum and optical photometry
  38. GRB 011211: TNG Spectroscopic Observations
  39. GRB011212 (=H10001): An X-Ray Rich GRB Detected by HETE
  40. GRB011130, optical observations
  41. GRB011130 (=XRF011130): Second Revised Localization by HETE
  42. GRB011130 (XRF011130) optical observations
  43. GRB011130 (=XRF011130): Revised Localization of an X-ray
  44. GRB011130 (=H1864): An X-Ray Rich GRB Detected by HETE
  45. GRB 011121: J-band observations
  46. GRB011121
  47. GRB011030: Z-band observations
  48. GRB 010921: HST Detection of the Afterglow and Host Galaxy
  49. GRB 970828: HST Observations of the Host Galaxy
  50. GRB 000131: HST Detection of the Host Galaxy
  51. GRB 970828: HST Observations of the Host Galaxy
  52. GRB010921, optical observation
  53. Optical observation of SGR 1806-20 at the 6-m SAO telescope
  54. GRB011019: Subaru Optical Observations
  55. GRB010921, optical observation at early time
  56. GRB 010921, I-band observations
  57. GRB011019: A Faint, X-ray Rich GRB localized by HETE
  58. GRB010921: Spectroscopy of the Host Galaxy
  59. GRB010923 as seen by BeppoSAX GRBM
  60. GRB010928(=H1770): Localization of a Long GRB by HETE
  61. GRB010923(=H1764): A Short Duration GRB Detected by HETE
  62. GRB010921, negative optical observations
  63. GRB010921 Optical Observations
  64. H1761: A Bright GRB Detected by HETE
  65. HETE Trigger #1760 (GRB 010920B?): a new optical source
  66. HETE Trigger #1759 (GRB 010920?) optical observations
  67. GRB 010222: HST observations -- host galaxy and late-time decay
  68. Dramatic Increase in the Rate of X-ray Bursts Reported by HETE
  69. SGR1900+14 burst seen by HETE: BeppoSAX data
  70. SGR1900+14: High Fluence Burst Localized by HETE
  71. GRB010629: A Burst Localized by HETE
  72. SGR1900+14: Second Burst Localized by HETE
  73. SGR1900+14: A Burst Localized by HETE
  74. Possible burst from SGR1806-20
  75. IPN detection of SGR1900+14
  76. SGR1806-20: A Second, Intense Burst Localized by HETE
  77. SGR1806-20: Localization by HETE
  78. HETE Fully-Automated GCN Notices
  79. GRB000301C: Late-time HST/STIS observation
  80. GRB010518: a faint BeppoSAX detection
  81. GRB000418: HST/STIS Second-epoch Observations
  82. X-ray precursors to the large flare from SGR 1900+14
  83. GRB010427, Gamma Ray Observations
  84. SGR 1900+14 : RXTE observations
  85. Chandra Observations of SGR 1900+14
  86. Possible precursor to the SGR1900+14 giant burst
  87. SGR1900+14, I-band observations
  88. IPN Triangulation of the Giant Flare from SGR1900+14
  89. Giant flare from SGR1900+14
  90. GRB010412: BeppoSAX GRBM and WFC observations
  91. BeppoSAX GRB: extension of BSAX operations upto April 30, 2002
  92. REVISED LOCATION OF GRB010326A
  93. GRB 980326: Late-time HST/STIS observations
  94. GRB010324, field photometry
  95. GRB010326B, field photometry
  96. GRB010326, field photometry
  97. Further Optical Observations of GRB 010324
  98. GRB010324: BeppoSAX/GRBM data
  99. GRB010324, optical observations
  100. GRB010326B: Localization by HETE (2nd GRB for this date)

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