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GCN Circulars

GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. 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"

41624 results found.

  1. GRB020331 field photometry
  2. GRB 020331 Optical Observations
  3. GRB 020331, NIR observations
  4. GRB 020331: Optical 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. GRB011211: HST Observations of Optical Afterglow and Host Galaxy
  10. GRB 020322, Radio observations
  11. Near-Infrared Observations of GRB020322 at TIRGO
  12. GRB 020321, Radio Observations
  13. GRB 020322: Optical Observations
  14. GRB020127: Proposed Host Galaxy Detection and Identification of Afterglow
  15. GRB 020321: Optical observations
  16. GRB020317 BVRI field photometry
  17. GRB011211 revised BVRI field photometry
  18. GRB020305 BVRI field photometry
  19. GRB020322 BVRI field photometry
  20. GRB 020322 optical observations
  21. GRB 020322 optical observation
  22. GRB020317 : Near IR Observations from Mt Abu Observatory
  23. GRB 020322: Optical Sources and Improved Astrometry
  24. GRB020322, optical observations
  25. GRB 020322: Optical candidate
  26. XMM-Newton observation of GRB020322
  27. GRB020322: Optical Observations
  28. GRB020322: BeppoSAX/NFI Observations
  29. Bepposax GRB020322 The second springtime BSAX GRB
  30. GRB 020321: Optical observations
  31. GRB020317: optical observations
  32. GRB020321 optical observations
  33. GRB020321: BeppoSAX/NFI Observations
  34. GRB020321: a faint BeppoSAX detection
  35. GRB020305: NIR observations
  36. GRB 020317 : KISO Optical Observations
  37. GRB020317 (=H1959): Localization by HETE of a Low Fluence GRB
  38. GRB 020305: Optical Observations
  39. GRB020317, optical observations
  40. GRB 020317: Optical observations
  41. GRB 011121: Third HST Epoch
  42. GRB020305: Properties of the Candidate Optical Afterglow
  43. GRB 011121: HST Observations reveal an intermediate-time multicolor
  44. GRB011121, possible supernova association
  45. GRB011130 (XRF011130) Second Epoch Chandra Observations
  46. GRB020305: Subaru Optical Observations
  47. GRB 020305: Optical observations
  48. XRF/GRB 011030: Detection of the Probable Host Galaxy
  49. GRB 020305: Candidate optical afterglow
  50. Type Ic SN2002bl (SN/GRB?) Radio Observations
  51. GRB020305, optical observations
  52. GRB020305: Optical Observations
  53. IPN triangulation of GRB020305 (HETE 1939)
  54. GRB020305 (=H1939): Localization of a GRB by HETE
  55. GRB 020305: Optical observations
  56. HST Imaging of the afterglow and host of GRB 011121
  57. GRB 010921: HST Observations
  58. IPN detection and localization of Cygnus X-1 flares
  59. GRB020127: Further VLA Observations of Possible Counterparts
  60. RXTE Observations of SGR 1900+14
  61. SGR1900+14 activity
  62. IPN/HETE Detection of Bursts from SGR1900+14
  63. IPN Upper Limits to a GRB Associated With SN2002ap
  64. GRB020124 BVRI field photometry
  65. GRB020127: Palomar and VLA Observations of Possible Counterparts
  66. GRB020127: Comparison of Chandra Epochs and Identification of Possible Counterparts
  67. SN2002ap (SN/GRB?) Echelle spectra
  68. SN2002ap (SN/GRB?) optical spectrographic observations
  69. GRB020127, WSRT radio observations
  70. GRB020127 Optical Observations
  71. SN 2002ap (SN/GRB?)
  72. SN 2002ap in M74
  73. SN2002ap (SN/GRB?) UBVRI Field Photometry
  74. GRB020127: Chandra Observations and Prospective Counterparts
  75. pre-SN2002ap (SN/GRB?) imaging of M74
  76. SN 2002ap (hypernova / GRB ??): special list on VSNET
  77. Type Ib/c SN2002ap (SN/GRB?)
  78. Type Ib/c SN2002ap (SN/GRB?) Radio Observations
  79. GRB020124, optical observations
  80. GRB020127: Optical observations
  81. GRB 020127, I-band observations starting 3.14-hr after the event
  82. IPN detection of further activity from SGR1806-20
  83. IPN triangulation of GRB020127 (=H1902)
  84. GRB020127 Optical Observations -- Erratum to GCN 1230
  85. GRB010921 Optical Observations
  86. GRB020127(=H1902): Localization of a Double-Peaked GRB by HETE
  87. GRB020124: Optical observations
  88. VLT observations of GRB 020124: The fading optical/near-infrared afterglow
  89. GRB020124: Optical observations
  90. GRB 020124: Optical observations
  91. GRB 020124 Optical Observations
  92. IPN triangulation of GRB020124 (HETE 1896)
  93. IPN observations of SGR1806-20
  94. GRB 020124: Optical afterglow
  95. GRB020124(=H1896): Localization of a Long GRB by HETE
  96. HETE 1896: Optical observations
  97. GRB optical counterpart candidate in GCN 1217 is M dwarf
  98. Possible optical counterpart to a GRB
  99. GRB011212, Optical Observations
  100. GRB011211: BeppoSAX/GRBM data

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