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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"

41686 results found.

  1. GRB02033 NIR observation at KPNO
  2. GRB020331 field photometry
  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. GRB020322: Candidate Optical Afterglow
  22. GRB 020322 optical observation
  23. GRB020317 : Near IR Observations from Mt Abu Observatory
  24. GRB 020322: Optical Sources and Improved Astrometry
  25. GRB020322, optical observations
  26. GRB 020322: Optical candidate
  27. XMM-Newton observation of GRB020322
  28. GRB020322: Optical Observations
  29. GRB020322: BeppoSAX/NFI Observations
  30. Bepposax GRB020322 The second springtime BSAX GRB
  31. GRB 020321: Optical observations
  32. GRB 011121: Fourth Epoch of HST Imaging
  33. GRB020317: optical observations
  34. GRB020321 optical observations
  35. GRB020321: BeppoSAX/NFI Observations
  36. GRB020321: a faint BeppoSAX detection
  37. GRB020305: NIR observations
  38. GRB 020317 : KISO Optical Observations
  39. BeppoSAX ALERT: GRB020321, the "Springtime Burst"
  40. GRB020317 (=H1959): Localization by HETE of a Low Fluence GRB
  41. GRB 020305: Optical Observations
  42. GRB020317, optical observations
  43. GRB 020317: Optical observations
  44. GRB 011121: Third HST Epoch
  45. GRB020305: Properties of the Candidate Optical Afterglow
  46. GRB 011121: HST Observations reveal an intermediate-time multicolor
  47. GRB011121, possible supernova association
  48. GRB011130 (XRF011130) Second Epoch Chandra Observations
  49. GRB020305: Subaru Optical Observations
  50. GRB 020305: Optical observations
  51. XRF/GRB 011030 Images
  52. XRF/GRB 011030: Detection of the Probable Host Galaxy
  53. GRB 020305: Candidate optical afterglow
  54. Type Ic SN2002bl (SN/GRB?) Radio Observations
  55. GRB020305, optical observations
  56. GRB020305 (=H1939): Localization of a GRB by HETE
  57. HST Imaging of the afterglow and host of GRB 011121
  58. GRB 010921: HST Observations
  59. IPN detection and localization of Cygnus X-1 flares
  60. GRB020127: Further VLA Observations of Possible Counterparts
  61. RXTE Observations of SGR 1900+14
  62. IPN detection of further SGR1900+14 activity
  63. SGR1900+14 activity
  64. IPN/HETE Detection of Bursts from SGR1900+14
  65. IPN Upper Limits to a GRB Associated With SN2002ap
  66. GRB020124 BVRI field photometry
  67. GRB020127: Palomar and VLA Observations of Possible Counterparts
  68. GRB020127: Comparison of Chandra Epochs and Identification of Possible Counterparts
  69. SN2002ap (SN/GRB?) Echelle spectra
  70. SN2002ap (SN/GRB?) optical spectrographic observations
  71. GRB020127, WSRT radio observations
  72. GRB020127 Optical Observations
  73. SN 2002ap (SN/GRB?)
  74. SN 2002ap in M74
  75. SN2002ap (SN/GRB?) UBVRI Field Photometry
  76. GRB020127: Chandra Observations and Prospective Counterparts
  77. pre-SN2002ap (SN/GRB?) imaging of M74
  78. Type Ib/c SN2002ap (SN/GRB?)
  79. Type Ib/c SN2002ap (SN/GRB?) Radio Observations
  80. GRB020124, optical observations
  81. GRB020127: Optical observations
  82. GRB 020127, I-band observations starting 3.14-hr after the event
  83. IPN detection of further activity from SGR1806-20
  84. IPN triangulation of GRB020127 (=H1902)
  85. GRB020127 Optical Observations -- Erratum to GCN 1230
  86. GRB010921 Optical Observations
  87. GRB020127(=H1902): Localization of a Double-Peaked GRB by HETE
  88. GRB020124: Optical observations
  89. VLT observations of GRB 020124: The fading optical/near-infrared afterglow
  90. GRB020124: Optical observations
  91. GRB 020124: Optical observations
  92. GRB 020124 Optical Observations
  93. IPN triangulation of GRB020124 (HETE 1896)
  94. IPN observations of SGR1806-20
  95. GRB 020124: Optical afterglow
  96. GRB020124(=H1896): Localization of a Long GRB by HETE
  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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