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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"

44626 results found.

  1. GRB011212: Optical Observations
  2. GRB 020331: NIR Observations
  3. GRB 020331: NIR Observations
  4. GRB020331 NIR observation at KPNO (re-submission)
  5. GRB02033 NIR observation at KPNO
  6. GRB020331 field photometry
  7. GRB 020331 Optical Observations
  8. GRB 020331, NIR observations
  9. GRB 020331: Optical observations
  10. GRB020331(=H1963): The "Easter" Burst Detected by HETE
  11. GRB 020321: Infrared observations
  12. GRB 020322: BeppoSAX observations of the X-ray afterglow
  13. SN 2002ap - peak brightness date (SN/GRB?)
  14. GRB011211: HST Observations of Optical Afterglow and Host Galaxy
  15. GRB 020322, Radio observations
  16. Near-Infrared Observations of GRB020322 at TIRGO
  17. GRB 020321, Radio Observations
  18. GRB 020322: Optical Observations
  19. GRB020127: Proposed Host Galaxy Detection and Identification of Afterglow
  20. GRB 020321: Optical observations
  21. GRB020317 BVRI field photometry
  22. GRB011211 revised BVRI field photometry
  23. GRB020305 BVRI field photometry
  24. GRB020322 BVRI field photometry
  25. GRB 020322 optical observations
  26. GRB020322: Candidate Optical Afterglow
  27. GRB 020322 optical observation
  28. GRB020317 : Near IR Observations from Mt Abu Observatory
  29. GRB 020322: Optical Sources and Improved Astrometry
  30. GRB020322, optical observations
  31. GRB 020322: Optical candidate
  32. XMM-Newton observation of GRB020322
  33. GRB020322: Optical Observations
  34. GRB020322: BeppoSAX/NFI Observations
  35. Bepposax GRB020322 The second springtime BSAX GRB
  36. GRB 020321: Optical observations
  37. GRB 011121: Fourth Epoch of HST Imaging
  38. GRB020317: optical observations
  39. GRB020321 optical observations
  40. GRB020321: BeppoSAX/NFI Observations
  41. GRB020321: a faint BeppoSAX detection
  42. GRB020305: NIR observations
  43. GRB 020317 : KISO Optical Observations
  44. BeppoSAX ALERT: GRB020321, the "Springtime Burst"
  45. GRB020317 (=H1959): Localization by HETE of a Low Fluence GRB
  46. GRB 020305: Optical Observations
  47. GRB020317, optical observations
  48. GRB 020317: Optical observations
  49. GRB 011121: Third HST Epoch
  50. GRB020305: Properties of the Candidate Optical Afterglow
  51. GRB 011121: HST Observations reveal an intermediate-time multicolor
  52. GRB011121, possible supernova association
  53. GRB011130 (XRF011130) Second Epoch Chandra Observations
  54. GRB020305: Subaru Optical Observations
  55. GRB 020305: Optical observations
  56. XRF/GRB 011030 Images
  57. XRF/GRB 011030: Detection of the Probable Host Galaxy
  58. GRB 020305: Candidate optical afterglow
  59. Type Ic SN2002bl (SN/GRB?) Radio Observations
  60. GRB020305, optical observations
  61. GRB020305: Optical Observations
  62. IPN triangulation of GRB020305 (HETE 1939)
  63. GRB020305 (=H1939): Localization of a GRB by HETE
  64. GRB 020305: Optical observations
  65. HST Imaging of the afterglow and host of GRB 011121
  66. GRB 010921: HST Observations
  67. IPN detection and localization of Cygnus X-1 flares
  68. GRB020127: Further VLA Observations of Possible Counterparts
  69. RXTE Observations of SGR 1900+14
  70. IPN detection of further SGR1900+14 activity
  71. SGR1900+14 activity
  72. IPN/HETE Detection of Bursts from SGR1900+14
  73. IPN Upper Limits to a GRB Associated With SN2002ap
  74. GRB020124 BVRI field photometry
  75. GRB020127: Palomar and VLA Observations of Possible Counterparts
  76. GRB020127: Comparison of Chandra Epochs and Identification of Possible Counterparts
  77. SN2002ap (SN/GRB?) Echelle spectra
  78. SN2002ap (SN/GRB?) optical spectrographic observations
  79. GRB020127, WSRT radio observations
  80. GRB020127 Optical Observations
  81. SN 2002ap (SN/GRB?)
  82. SN 2002ap in M74
  83. SN2002ap (SN/GRB?) UBVRI Field Photometry
  84. GRB020127: Chandra Observations and Prospective Counterparts
  85. pre-SN2002ap (SN/GRB?) imaging of M74
  86. SN 2002ap (hypernova / GRB ??): special list on VSNET
  87. Type Ib/c SN2002ap (SN/GRB?)
  88. Type Ib/c SN2002ap (SN/GRB?) Radio Observations
  89. GRB020124, optical observations
  90. GRB020127: Optical observations
  91. GRB 020127, I-band observations starting 3.14-hr after the event
  92. IPN detection of further activity from SGR1806-20
  93. IPN triangulation of GRB020127 (=H1902)
  94. GRB020127 Optical Observations -- Erratum to GCN 1230
  95. GRB010921 Optical Observations
  96. GRB020127(=H1902): Localization of a Double-Peaked GRB by HETE
  97. GRB020124: Optical observations
  98. VLT observations of GRB 020124: The fading optical/near-infrared afterglow
  99. GRB020124: Optical observations
  100. GRB 020124: Optical observations

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