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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"

36155 results found.

  1. GRB020405: OT observations
  2. GRB 020331: Candidate Optical Afterglow
  3. GRB 020405: Decay index
  4. Short RXTE/ASM transient 020406; may be a GRB
  5. GRB020405, Radio Observations
  6. Fading Optical Afterglow and Possible Host Galaxy of GRB 020405
  7. GRB 020405, U-band observations
  8. GRB 020405: Optical afterglow candidate
  9. IPN localization of GRB020405
  10. GRB011212: Optical Observations
  11. GRB 020331: NIR Observations
  12. GRB 020331: NIR Observations
  13. GRB020331 NIR observation at KPNO (re-submission)
  14. GRB02033 NIR observation at KPNO
  15. GRB020331 field photometry
  16. GRB 020331 Optical Observations
  17. GRB 020331, NIR observations
  18. GRB 020331: Optical observations
  19. GRB020331(=H1963): The "Easter" Burst Detected by HETE
  20. GRB 020321: Infrared observations
  21. GRB 020322: BeppoSAX observations of the X-ray afterglow
  22. SN 2002ap - peak brightness date (SN/GRB?)
  23. GRB 020322, Radio observations
  24. Near-Infrared Observations of GRB020322 at TIRGO
  25. GRB 020321, Radio Observations
  26. GRB 020322: Optical Observations
  27. GRB020127: Proposed Host Galaxy Detection and Identification of Afterglow
  28. GRB 020321: Optical observations
  29. GRB020317 BVRI field photometry
  30. GRB011211 revised BVRI field photometry
  31. GRB020305 BVRI field photometry
  32. GRB020322 BVRI field photometry
  33. GRB 020322 optical observations
  34. GRB 020322 optical observation
  35. GRB020317 : Near IR Observations from Mt Abu Observatory
  36. GRB 020322: Optical Sources and Improved Astrometry
  37. GRB020322, optical observations
  38. GRB 020322: Optical candidate
  39. GRB020322: BeppoSAX/NFI Observations
  40. Bepposax GRB020322 The second springtime BSAX GRB
  41. GRB 020321: Optical observations
  42. GRB 011121: Fourth Epoch of HST Imaging
  43. GRB020317: optical observations
  44. GRB020321 optical observations
  45. GRB020321: BeppoSAX/NFI Observations
  46. GRB020321: a faint BeppoSAX detection
  47. GRB 020317 : KISO Optical Observations
  48. BeppoSAX ALERT: GRB020321, the "Springtime Burst"
  49. GRB020317 (=H1959): Localization by HETE of a Low Fluence GRB
  50. GRB 020305: Optical Observations
  51. GRB020317, optical observations
  52. GRB 020317: Optical observations
  53. GRB 011121: Third HST Epoch
  54. GRB020305: Properties of the Candidate Optical Afterglow
  55. GRB 011121: HST Observations reveal an intermediate-time multicolor
  56. GRB011121, possible supernova association
  57. GRB011130 (XRF011130) Second Epoch Chandra Observations
  58. GRB020305: Subaru Optical Observations
  59. GRB 020305: Optical observations
  60. XRF/GRB 011030 Images
  61. XRF/GRB 011030: Detection of the Probable Host Galaxy
  62. GRB 020305: Candidate optical afterglow
  63. Type Ic SN2002bl (SN/GRB?) Radio Observations
  64. GRB020305: Optical Observations
  65. IPN triangulation of GRB020305 (HETE 1939)
  66. GRB020305 (=H1939): Localization of a GRB by HETE
  67. GRB 020305: Optical observations
  68. HST Imaging of the afterglow and host of GRB 011121
  69. GRB 010921: HST Observations
  70. IPN detection and localization of Cygnus X-1 flares
  71. GRB020127: Further VLA Observations of Possible Counterparts
  72. IPN detection of further SGR1900+14 activity
  73. SGR1900+14 activity
  74. IPN/HETE Detection of Bursts from SGR1900+14
  75. IPN Upper Limits to a GRB Associated With SN2002ap
  76. GRB020124 BVRI field photometry
  77. GRB020127: Comparison of Chandra Epochs and Identification of Possible Counterparts
  78. SN2002ap (SN/GRB?) Echelle spectra
  79. SN2002ap (SN/GRB?) optical spectrographic observations
  80. GRB020127 Optical Observations
  81. SN 2002ap (SN/GRB?)
  82. SN2002ap (SN/GRB?) UBVRI Field Photometry
  83. GRB020127: Chandra Observations and Prospective Counterparts
  84. pre-SN2002ap (SN/GRB?) imaging of M74
  85. SN 2002ap (hypernova / GRB ??): special list on VSNET
  86. Type Ib/c SN2002ap (SN/GRB?)
  87. Type Ib/c SN2002ap (SN/GRB?) Radio Observations
  88. GRB020124, optical observations
  89. GRB020127: Optical observations
  90. GRB 020127, I-band observations starting 3.14-hr after the event
  91. IPN detection of further activity from SGR1806-20
  92. IPN triangulation of GRB020127 (=H1902)
  93. GRB010921 Optical Observations
  94. GRB020127(=H1902): Localization of a Double-Peaked GRB by HETE
  95. GRB020124: Optical observations
  96. VLT observations of GRB 020124: The fading optical/near-infrared afterglow
  97. GRB020124: Optical observations
  98. GRB 020124: Optical observations
  99. GRB 020124 Optical Observations
  100. IPN triangulation of GRB020124 (HETE 1896)

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