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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"

45533 results found.

  1. GRB020124 BVRI field photometry
  2. GRB020127: Palomar and VLA Observations of Possible Counterparts
  3. GRB020127: Comparison of Chandra Epochs and Identification of Possible Counterparts
  4. SN2002ap (SN/GRB?) Echelle spectra
  5. SN2002ap (SN/GRB?) optical spectrographic observations
  6. GRB020127, WSRT radio observations
  7. GRB020127 Optical Observations
  8. SN 2002ap (SN/GRB?)
  9. SN 2002ap in M74
  10. SN2002ap (SN/GRB?) UBVRI Field Photometry
  11. GRB020127: Chandra Observations and Prospective Counterparts
  12. pre-SN2002ap (SN/GRB?) imaging of M74
  13. SN 2002ap (hypernova / GRB ??): special list on VSNET
  14. Type Ib/c SN2002ap (SN/GRB?)
  15. Type Ib/c SN2002ap (SN/GRB?) Radio Observations
  16. GRB020124, optical observations
  17. GRB020127: Optical observations
  18. GRB 020127, I-band observations starting 3.14-hr after the event
  19. IPN detection of further activity from SGR1806-20
  20. IPN triangulation of GRB020127 (=H1902)
  21. GRB020127 Optical Observations -- Erratum to GCN 1230
  22. GRB010921 Optical Observations
  23. GRB020127(=H1902): Localization of a Double-Peaked GRB by HETE
  24. GRB020124: Optical observations
  25. VLT observations of GRB 020124: The fading optical/near-infrared afterglow
  26. GRB020124: Optical observations
  27. GRB 020124: Optical observations
  28. GRB 020124 Optical Observations
  29. IPN triangulation of GRB020124 (HETE 1896)
  30. IPN observations of SGR1806-20
  31. GRB 020124: Optical afterglow
  32. GRB020124(=H1896): Localization of a Long GRB by HETE
  33. HETE 1896: Optical observations
  34. GRB optical counterpart candidate in GCN 1217 is M dwarf
  35. Possible optical counterpart to a GRB
  36. GRB011212, Optical Observations
  37. GRB011211: BeppoSAX/GRBM data
  38. Optical polarization observations for GRB011211
  39. GRB 011211: Detection of the Probable Host Galaxy
  40. GRB 011130 and GRB 011212 - Milagro GeV/TeV Observations
  41. Color indices of the afterglow of GRB011211
  42. GRB011212: Optical observations at Gunma
  43. GRB 011211, spectrum and optical photometry
  44. GRB 011130: Optical Observations of X-ray and Radio Sources
  45. GRB 011130, Radio/X-ray Comparison
  46. GRB011212: Optical observations
  47. GRB 011212: optical observation at Asiago
  48. GRB 011211: Evidence for an Optical Break
  49. GRB 011211: TNG Spectroscopic Observations
  50. optical follow-up of GRB(XRF) 011211
  51. GRB 011212: optical observation at Oslo (relayed)
  52. GRB 011211: Optical Spectroscopy
  53. GRB 011211, Optical Observations
  54. GRB011212, BVRI field photometry
  55. GRB011211, BVRI field photometry
  56. GRB011212: Optical observations
  57. GRB 011211: BVRi-band photometry
  58. GRB011212 (=H10001): An X-Ray Rich GRB Detected by HETE
  59. Fading of the optical source associated of XRF 011211
  60. XMM-Newton observation of GRB011211
  61. GRB 011211 Optical Observations: Likely Afterglow
  62. GRB011130 (=XRF011130): Further analysis of Chandra Target of
  63. GRB011211(=XRF011211): BeppoSAX refined positions
  64. BeppoSAX Alert: GRB011211(=XRF011211)
  65. GRB 011130: Optical Observations of Chandra Sources
  66. GRB 011130: Optical Observations of Chandra sources
  67. GRB011130 (XRF011130) Chandra Observations
  68. GRB011130 (=XRF011130): Scheduled Target of Opportunity
  69. GRB 011130: Magellan spectroscopy
  70. Sub-mm and Centimeter Detections of the Host Galaxy of GRB000418
  71. GRB011130, optical observations
  72. GRB 011130, K band observations
  73. GRB011130, optical observations
  74. GRB011130 (=XRF011130): Second Revised Localization by HETE
  75. GRB 011130 I-band Observation
  76. GRB011130 (XRF011130) optical observations
  77. GRB011130 (XRF011130) SDSS PT i-band observations
  78. XRF011130: Infrared Observations
  79. GRB011130, Radio Observations
  80. Detection of the X-ray afterglow of GRB011121 by BeppoSAX
  81. GRB011130 (=XRF011130), Optical Observations
  82. XRF011130: NEAT Optical Observations
  83. GRB011130 (=XRF011130): Revised Localization of an X-ray
  84. GRB001109, Radio Monitoring
  85. GRB 011121
  86. GRB011130 (=H1864): An X-Ray Rich GRB Detected by HETE
  87. GRB 011121: J-band observations
  88. GRB 011121: NIR observations, host galaxy?
  89. GRB010921 - Milagro GeV/TeV Observations
  90. GRB 011121: HST Scheduled
  91. GRB011121: fainter still
  92. Correction: GCN1157 (GRB 011121)
  93. GRB011121: UBRI Observations
  94. GRB011121
  95. GRB 011121: Radio Observations
  96. GRB 011121 J-Band Astrometry
  97. GRB011121: continued decay
  98. GRB 011121: Detection of Bright IR Counterpart
  99. GRB011121: possible redshift, continued decay
  100. GRB011121: fading behavior

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