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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"

26482 results found.

  1. IPN localization of GRB020405
  2. GRB011212: Optical Observations
  3. GRB 020331: NIR Observations
  4. GRB 020331, NIR observations
  5. GRB020331(=H1963): The "Easter" Burst Detected by HETE
  6. GRB 020321: Infrared observations
  7. GRB 020322: BeppoSAX observations of the X-ray afterglow
  8. SN 2002ap - peak brightness date (SN/GRB?)
  9. Near-Infrared Observations of GRB020322 at TIRGO
  10. GRB 020322: Optical Observations
  11. GRB011211 revised BVRI field photometry
  12. GRB020305 BVRI field photometry
  13. GRB020322 BVRI field photometry
  14. GRB 020322 optical observations
  15. GRB020317 : Near IR Observations from Mt Abu Observatory
  16. GRB 020322: Optical Sources and Improved Astrometry
  17. GRB020322, optical observations
  18. XMM-Newton observation of GRB020322
  19. GRB020322: Optical Observations
  20. GRB 020321: Optical observations
  21. GRB020317: optical observations
  22. GRB020321: a faint BeppoSAX detection
  23. GRB020305: NIR observations
  24. GRB 020317 : KISO Optical Observations
  25. GRB020317 (=H1959): Localization by HETE of a Low Fluence GRB
  26. GRB 020305: Optical Observations
  27. GRB020317, optical observations
  28. GRB 011121: Third HST Epoch
  29. GRB020305: Properties of the Candidate Optical Afterglow
  30. GRB 011121: HST Observations reveal an intermediate-time multicolor
  31. GRB011121, possible supernova association
  32. GRB011130 (XRF011130) Second Epoch Chandra Observations
  33. GRB020305: Subaru Optical Observations
  34. GRB020305, optical observations
  35. IPN triangulation of GRB020305 (HETE 1939)
  36. GRB020305 (=H1939): Localization of a GRB by HETE
  37. HST Imaging of the afterglow and host of GRB 011121
  38. GRB 010921: HST Observations
  39. IPN detection and localization of Cygnus X-1 flares
  40. RXTE Observations of SGR 1900+14
  41. SGR1900+14 activity
  42. IPN/HETE Detection of Bursts from SGR1900+14
  43. IPN Upper Limits to a GRB Associated With SN2002ap
  44. GRB020124 BVRI field photometry
  45. GRB020127: Comparison of Chandra Epochs and Identification of Possible Counterparts
  46. SN2002ap (SN/GRB?) Echelle spectra
  47. GRB020127 Optical Observations
  48. SN 2002ap (SN/GRB?)
  49. SN 2002ap in M74
  50. SN2002ap (SN/GRB?) UBVRI Field Photometry
  51. GRB020127: Chandra Observations and Prospective Counterparts
  52. GRB020124, optical observations
  53. GRB020127: Optical observations
  54. GRB020127(=H1902): Localization of a Double-Peaked GRB by HETE
  55. VLT observations of GRB 020124: The fading optical/near-infrared afterglow
  56. GRB 020124 Optical Observations
  57. IPN triangulation of GRB020124 (HETE 1896)
  58. GRB 020124: Optical afterglow
  59. GRB020124(=H1896): Localization of a Long GRB by HETE
  60. Possible optical counterpart to a GRB
  61. GRB011211: BeppoSAX/GRBM data
  62. Optical polarization observations for GRB011211
  63. GRB 011211: Detection of the Probable Host Galaxy
  64. GRB 011130 and GRB 011212 - Milagro GeV/TeV Observations
  65. Color indices of the afterglow of GRB011211
  66. GRB011212: Optical observations at Gunma
  67. GRB 011211, spectrum and optical photometry
  68. GRB 011130: Optical Observations of X-ray and Radio Sources
  69. GRB 011130, Radio/X-ray Comparison
  70. GRB 011211: Evidence for an Optical Break
  71. GRB 011211: TNG Spectroscopic Observations
  72. GRB 011212: optical observation at Oslo (relayed)
  73. GRB 011211, Optical Observations
  74. GRB011211, BVRI field photometry
  75. GRB011212 (=H10001): An X-Ray Rich GRB Detected by HETE
  76. Fading of the optical source associated of XRF 011211
  77. GRB011130 (=XRF011130): Further analysis of Chandra Target of
  78. GRB 011130: Optical Observations of Chandra Sources
  79. GRB 011130: Optical Observations of Chandra sources
  80. GRB011130 (XRF011130) Chandra Observations
  81. GRB011130 (=XRF011130): Scheduled Target of Opportunity
  82. GRB 011130: Magellan spectroscopy
  83. GRB011130, optical observations
  84. GRB 011130, K band observations
  85. GRB011130 (=XRF011130): Second Revised Localization by HETE
  86. GRB 011130 I-band Observation
  87. GRB011130 (XRF011130) optical observations
  88. GRB011130 (XRF011130) SDSS PT i-band observations
  89. Detection of the X-ray afterglow of GRB011121 by BeppoSAX
  90. GRB011130 (=XRF011130): Revised Localization of an X-ray
  91. GRB001109, Radio Monitoring
  92. GRB011130 (=H1864): An X-Ray Rich GRB Detected by HETE
  93. GRB010921 - Milagro GeV/TeV Observations
  94. GRB011121: fainter still
  95. GRB011121
  96. GRB 011121: Radio Observations
  97. GRB 011121 J-Band Astrometry
  98. GRB011121: continued decay
  99. GRB011121: possible redshift, continued decay
  100. GRB011121: fading behavior

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