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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"

41682 results found.

  1. GRB020331(=H1963): The "Easter" Burst Detected by HETE
  2. GRB 020321: Infrared observations
  3. GRB 020322: BeppoSAX observations of the X-ray afterglow
  4. SN 2002ap - peak brightness date (SN/GRB?)
  5. GRB011211: HST Observations of Optical Afterglow and Host Galaxy
  6. GRB 020322, Radio observations
  7. Near-Infrared Observations of GRB020322 at TIRGO
  8. GRB 020321, Radio Observations
  9. GRB 020322: Optical Observations
  10. GRB020127: Proposed Host Galaxy Detection and Identification of Afterglow
  11. GRB 020321: Optical observations
  12. GRB020317 BVRI field photometry
  13. GRB011211 revised BVRI field photometry
  14. GRB020305 BVRI field photometry
  15. GRB020322 BVRI field photometry
  16. GRB 020322 optical observations
  17. GRB020322: Candidate Optical Afterglow
  18. GRB 020322 optical observation
  19. GRB020317 : Near IR Observations from Mt Abu Observatory
  20. GRB 020322: Optical Sources and Improved Astrometry
  21. GRB020322, optical observations
  22. GRB 020322: Optical candidate
  23. XMM-Newton observation of GRB020322
  24. GRB020322: Optical Observations
  25. GRB020322: BeppoSAX/NFI Observations
  26. Bepposax GRB020322 The second springtime BSAX GRB
  27. GRB 020321: Optical observations
  28. GRB 011121: Fourth Epoch of HST Imaging
  29. GRB020317: optical observations
  30. GRB020321 optical observations
  31. GRB020321: BeppoSAX/NFI Observations
  32. GRB020321: a faint BeppoSAX detection
  33. GRB020305: NIR observations
  34. GRB 020317 : KISO Optical Observations
  35. BeppoSAX ALERT: GRB020321, the "Springtime Burst"
  36. GRB020317 (=H1959): Localization by HETE of a Low Fluence GRB
  37. GRB 020305: Optical Observations
  38. GRB020317, optical observations
  39. GRB 020317: Optical observations
  40. GRB 011121: Third HST Epoch
  41. GRB020305: Properties of the Candidate Optical Afterglow
  42. GRB 011121: HST Observations reveal an intermediate-time multicolor
  43. GRB011121, possible supernova association
  44. GRB011130 (XRF011130) Second Epoch Chandra Observations
  45. GRB020305: Subaru Optical Observations
  46. GRB 020305: Optical observations
  47. XRF/GRB 011030 Images
  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 (=H1939): Localization of a GRB by HETE
  53. HST Imaging of the afterglow and host of GRB 011121
  54. GRB 010921: HST Observations
  55. IPN detection and localization of Cygnus X-1 flares
  56. GRB020127: Further VLA Observations of Possible Counterparts
  57. RXTE Observations of SGR 1900+14
  58. IPN detection of further SGR1900+14 activity
  59. SGR1900+14 activity
  60. IPN/HETE Detection of Bursts from SGR1900+14
  61. IPN Upper Limits to a GRB Associated With SN2002ap
  62. GRB020124 BVRI field photometry
  63. GRB020127: Palomar and VLA Observations of Possible Counterparts
  64. GRB020127: Comparison of Chandra Epochs and Identification of Possible Counterparts
  65. SN2002ap (SN/GRB?) Echelle spectra
  66. SN2002ap (SN/GRB?) optical spectrographic observations
  67. GRB020127, WSRT radio observations
  68. GRB020127 Optical Observations
  69. SN 2002ap (SN/GRB?)
  70. SN 2002ap in M74
  71. SN2002ap (SN/GRB?) UBVRI Field Photometry
  72. GRB020127: Chandra Observations and Prospective Counterparts
  73. pre-SN2002ap (SN/GRB?) imaging of M74
  74. Type Ib/c SN2002ap (SN/GRB?)
  75. Type Ib/c SN2002ap (SN/GRB?) Radio Observations
  76. GRB020124, optical observations
  77. GRB020127: Optical observations
  78. GRB 020127, I-band observations starting 3.14-hr after the event
  79. IPN detection of further activity from SGR1806-20
  80. IPN triangulation of GRB020127 (=H1902)
  81. GRB020127 Optical Observations -- Erratum to GCN 1230
  82. GRB010921 Optical Observations
  83. GRB020127(=H1902): Localization of a Double-Peaked GRB by HETE
  84. GRB020124: Optical observations
  85. VLT observations of GRB 020124: The fading optical/near-infrared afterglow
  86. GRB020124: Optical observations
  87. GRB 020124: Optical observations
  88. GRB 020124 Optical Observations
  89. IPN triangulation of GRB020124 (HETE 1896)
  90. IPN observations of SGR1806-20
  91. GRB 020124: Optical afterglow
  92. GRB020124(=H1896): Localization of a Long GRB by HETE
  93. GRB optical counterpart candidate in GCN 1217 is M dwarf
  94. Possible optical counterpart to a GRB
  95. GRB011212, Optical Observations
  96. GRB011211: BeppoSAX/GRBM data
  97. Optical polarization observations for GRB011211
  98. GRB 011211: Detection of the Probable Host Galaxy
  99. GRB 011130 and GRB 011212 - Milagro GeV/TeV Observations
  100. Color indices of the afterglow of GRB011211

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