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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"

36310 results found.

  1. GRB020321: a faint BeppoSAX detection
  2. GRB 020317 : KISO Optical Observations
  3. BeppoSAX ALERT: GRB020321, the "Springtime Burst"
  4. GRB020317 (=H1959): Localization by HETE of a Low Fluence GRB
  5. GRB 020305: Optical Observations
  6. GRB020317, optical observations
  7. GRB 020317: Optical observations
  8. GRB 011121: Third HST Epoch
  9. GRB020305: Properties of the Candidate Optical Afterglow
  10. GRB 011121: HST Observations reveal an intermediate-time multicolor
  11. GRB011121, possible supernova association
  12. GRB011130 (XRF011130) Second Epoch Chandra Observations
  13. GRB020305: Subaru Optical Observations
  14. GRB 020305: Optical observations
  15. XRF/GRB 011030 Images
  16. XRF/GRB 011030: Detection of the Probable Host Galaxy
  17. GRB 020305: Candidate optical afterglow
  18. Type Ic SN2002bl (SN/GRB?) Radio Observations
  19. GRB020305: Optical Observations
  20. IPN triangulation of GRB020305 (HETE 1939)
  21. GRB020305 (=H1939): Localization of a GRB by HETE
  22. GRB 020305: Optical observations
  23. HST Imaging of the afterglow and host of GRB 011121
  24. GRB 010921: HST Observations
  25. IPN detection and localization of Cygnus X-1 flares
  26. GRB020127: Further VLA Observations of Possible Counterparts
  27. IPN detection of further SGR1900+14 activity
  28. SGR1900+14 activity
  29. IPN/HETE Detection of Bursts from SGR1900+14
  30. IPN Upper Limits to a GRB Associated With SN2002ap
  31. GRB020124 BVRI field photometry
  32. GRB020127: Comparison of Chandra Epochs and Identification of Possible Counterparts
  33. SN2002ap (SN/GRB?) Echelle spectra
  34. SN2002ap (SN/GRB?) optical spectrographic observations
  35. GRB020127 Optical Observations
  36. SN 2002ap (SN/GRB?)
  37. SN2002ap (SN/GRB?) UBVRI Field Photometry
  38. GRB020127: Chandra Observations and Prospective Counterparts
  39. pre-SN2002ap (SN/GRB?) imaging of M74
  40. SN 2002ap (hypernova / GRB ??): special list on VSNET
  41. Type Ib/c SN2002ap (SN/GRB?)
  42. Type Ib/c SN2002ap (SN/GRB?) Radio Observations
  43. GRB020124, optical observations
  44. GRB020127: Optical observations
  45. GRB 020127, I-band observations starting 3.14-hr after the event
  46. IPN detection of further activity from SGR1806-20
  47. IPN triangulation of GRB020127 (=H1902)
  48. GRB010921 Optical Observations
  49. GRB020127(=H1902): Localization of a Double-Peaked GRB by HETE
  50. GRB020124: Optical observations
  51. VLT observations of GRB 020124: The fading optical/near-infrared afterglow
  52. GRB020124: Optical observations
  53. GRB 020124: Optical observations
  54. GRB 020124 Optical Observations
  55. IPN triangulation of GRB020124 (HETE 1896)
  56. IPN observations of SGR1806-20
  57. GRB 020124: Optical afterglow
  58. GRB020124(=H1896): Localization of a Long GRB by HETE
  59. GRB optical counterpart candidate in GCN 1217 is M dwarf
  60. Possible optical counterpart to a GRB
  61. GRB011212, Optical Observations
  62. GRB 011211: Detection of the Probable Host Galaxy
  63. GRB 011130 and GRB 011212 - Milagro GeV/TeV Observations
  64. GRB 011211, spectrum and optical photometry
  65. GRB 011130: Optical Observations of X-ray and Radio Sources
  66. GRB 011130, Radio/X-ray Comparison
  67. GRB 011212: optical observation at Asiago
  68. GRB 011211: Evidence for an Optical Break
  69. GRB 011211: TNG Spectroscopic Observations
  70. optical follow-up of GRB(XRF) 011211
  71. GRB 011212: optical observation at Oslo (relayed)
  72. GRB 011211: Optical Spectroscopy
  73. GRB 011211, Optical Observations
  74. GRB011212, BVRI field photometry
  75. GRB011211, BVRI field photometry
  76. GRB011212: Optical observations
  77. GRB 011211: BVRi-band photometry
  78. GRB011212 (=H10001): An X-Ray Rich GRB Detected by HETE
  79. Fading of the optical source associated of XRF 011211
  80. GRB 011211 Optical Observations: Likely Afterglow
  81. BeppoSAX Alert: GRB011211(=XRF011211)
  82. GRB 011130: Optical Observations of Chandra Sources
  83. GRB 011130: Optical Observations of Chandra sources
  84. GRB 011130: Magellan spectroscopy
  85. Sub-mm and Centimeter Detections of the Host Galaxy of GRB000418
  86. GRB011130, optical observations
  87. GRB 011130, K band observations
  88. GRB011130, optical observations
  89. GRB 011130 I-band Observation
  90. GRB011130 (XRF011130) optical observations
  91. GRB011130 (XRF011130) SDSS PT i-band observations
  92. Detection of the X-ray afterglow of GRB011121 by BeppoSAX
  93. XRF011130: NEAT Optical Observations
  94. GRB011130 (=XRF011130): Revised Localization of an X-ray
  95. GRB001109, Radio Monitoring
  96. GRB 011121: Errata URL
  97. GRB 011121
  98. GRB011130 (=H1864): An X-Ray Rich GRB Detected by HETE
  99. GRB 011121: J-band observations
  100. GRB 011121: NIR observations, host galaxy?

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