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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"

43681 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. GRB 020127, I-band observations starting 3.14-hr after the event
  17. IPN detection of further activity from SGR1806-20
  18. IPN triangulation of GRB020127 (=H1902)
  19. GRB010921 Optical Observations
  20. GRB020127(=H1902): Localization of a Double-Peaked GRB by HETE
  21. VLT observations of GRB 020124: The fading optical/near-infrared afterglow
  22. GRB020124: Optical observations
  23. GRB 020124: Optical observations
  24. GRB 020124 Optical Observations
  25. IPN triangulation of GRB020124 (HETE 1896)
  26. IPN observations of SGR1806-20
  27. GRB 020124: Optical afterglow
  28. GRB020124(=H1896): Localization of a Long GRB by HETE
  29. HETE 1896: Optical observations
  30. GRB optical counterpart candidate in GCN 1217 is M dwarf
  31. Possible optical counterpart to a GRB
  32. GRB011212, Optical Observations
  33. GRB011211: BeppoSAX/GRBM data
  34. Optical polarization observations for GRB011211
  35. GRB 011211: Detection of the Probable Host Galaxy
  36. GRB 011130 and GRB 011212 - Milagro GeV/TeV Observations
  37. Color indices of the afterglow of GRB011211
  38. GRB011212: Optical observations at Gunma
  39. GRB 011211, spectrum and optical photometry
  40. GRB 011130: Optical Observations of X-ray and Radio Sources
  41. GRB 011130, Radio/X-ray Comparison
  42. GRB011212: Optical observations
  43. GRB 011212: optical observation at Asiago
  44. GRB 011211: Evidence for an Optical Break
  45. GRB 011211: TNG Spectroscopic Observations
  46. GRB 011212: optical observation at Oslo (relayed)
  47. GRB 011211: Optical Spectroscopy
  48. GRB 011211, Optical Observations
  49. GRB011212, BVRI field photometry
  50. GRB011211, BVRI field photometry
  51. GRB 011211: BVRi-band photometry
  52. GRB011212 (=H10001): An X-Ray Rich GRB Detected by HETE
  53. Fading of the optical source associated of XRF 011211
  54. XMM-Newton observation of GRB011211
  55. GRB 011211 Optical Observations: Likely Afterglow
  56. GRB011130 (=XRF011130): Further analysis of Chandra Target of
  57. GRB011211(=XRF011211): BeppoSAX refined positions
  58. GRB 011130: Optical Observations of Chandra Sources
  59. GRB011130 (XRF011130) Chandra Observations
  60. GRB011130 (=XRF011130): Scheduled Target of Opportunity
  61. GRB 011130: Magellan spectroscopy
  62. Sub-mm and Centimeter Detections of the Host Galaxy of GRB000418
  63. GRB011130, optical observations
  64. GRB 011130, K band observations
  65. GRB011130, optical observations
  66. GRB011130 (=XRF011130): Second Revised Localization by HETE
  67. GRB 011130 I-band Observation
  68. GRB011130 (XRF011130) optical observations
  69. GRB011130 (XRF011130) SDSS PT i-band observations
  70. XRF011130: Infrared Observations
  71. GRB011130, Radio Observations
  72. Detection of the X-ray afterglow of GRB011121 by BeppoSAX
  73. GRB011130 (=XRF011130), Optical Observations
  74. GRB011130 (=XRF011130): Revised Localization of an X-ray
  75. GRB001109, Radio Monitoring
  76. GRB 011121
  77. GRB011130 (=H1864): An X-Ray Rich GRB Detected by HETE
  78. GRB 011121: J-band observations
  79. GRB 011121: NIR observations, host galaxy?
  80. GRB010921 - Milagro GeV/TeV Observations
  81. GRB 011121: HST Scheduled
  82. GRB011121: fainter still
  83. GRB011121: UBRI Observations
  84. GRB011121
  85. GRB 011121: Radio Observations
  86. GRB 011121 J-Band Astrometry
  87. GRB011121: continued decay
  88. GRB 011121: Detection of Bright IR Counterpart
  89. GRB011121: possible redshift, continued decay
  90. GRB011121: fading behavior
  91. GRB011121: possible optical counterpart
  92. GRB011121: BeppoSAX-WFC refined positions
  93. IPN triangulation of GRB011121
  94. BEPPOSAX GRB011121
  95. GRB 011030: TNG K-band observation
  96. XRF011030: J and K band observations
  97. XRF011030: Chandra Observations
  98. GRB 011030: K-band observations
  99. GRB011030: Z-band observations
  100. GRB 011030 R band observations

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