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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"

43668 results found.

  1. ASM GRB candidate 020406 refined error box
  2. GRB 020405: Moderate-resolution spectroscopy
  3. GRB020331: Optical Observations of Afterglow Candidate
  4. GRB020406(?), optical observations
  5. GRB020405: VLT optical observations
  6. Revised Photometry of the Optical Afterglow of GRB 020405
  7. GRB020405: OT observations
  8. GRB 020331: Candidate Optical Afterglow
  9. GRB 020405: Decay index
  10. Short RXTE/ASM transient 020406; may be a GRB
  11. GRB020405, Radio Observations
  12. GRB020405: VLT spectroscopy
  13. Fading Optical Afterglow and Possible Host Galaxy of GRB 020405
  14. V band observations of GRB020405
  15. GRB 020405, U-band observations
  16. GRB 020405: Optical afterglow candidate
  17. IPN localization of GRB020405
  18. GRB011212: Optical Observations
  19. GRB 020331: NIR Observations
  20. GRB 020331: NIR Observations
  21. GRB020331 NIR observation at KPNO (re-submission)
  22. GRB02033 NIR observation at KPNO
  23. GRB020331 field photometry
  24. GRB 020331 Optical Observations
  25. GRB 020331, NIR observations
  26. GRB 020331: Optical observations
  27. GRB020331(=H1963): The "Easter" Burst Detected by HETE
  28. GRB 020321: Infrared observations
  29. GRB 020322: BeppoSAX observations of the X-ray afterglow
  30. SN 2002ap - peak brightness date (SN/GRB?)
  31. GRB011211: HST Observations of Optical Afterglow and Host Galaxy
  32. Near-Infrared Observations of GRB020322 at TIRGO
  33. GRB 020321, Radio Observations
  34. GRB 020322: Optical Observations
  35. GRB020127: Proposed Host Galaxy Detection and Identification of Afterglow
  36. GRB 020321: Optical observations
  37. GRB020317 BVRI field photometry
  38. GRB011211 revised BVRI field photometry
  39. GRB020305 BVRI field photometry
  40. GRB020322 BVRI field photometry
  41. GRB 020322 optical observations
  42. GRB 020322 optical observation
  43. GRB020317 : Near IR Observations from Mt Abu Observatory
  44. GRB 020322: Optical Sources and Improved Astrometry
  45. GRB020322, optical observations
  46. GRB 020322: Optical candidate
  47. XMM-Newton observation of GRB020322
  48. GRB020322: Optical Observations
  49. GRB020322: BeppoSAX/NFI Observations
  50. Bepposax GRB020322 The second springtime BSAX GRB
  51. GRB 020321: Optical observations
  52. GRB 011121: Fourth Epoch of HST Imaging
  53. GRB020317: optical observations
  54. GRB020321 optical observations
  55. GRB020321: BeppoSAX/NFI Observations
  56. GRB020321: a faint BeppoSAX detection
  57. GRB020305: NIR observations
  58. GRB 020317 : KISO Optical Observations
  59. BeppoSAX ALERT: GRB020321, the "Springtime Burst"
  60. GRB020317 (=H1959): Localization by HETE of a Low Fluence GRB
  61. GRB 020305: Optical Observations
  62. GRB020317, optical observations
  63. GRB 020317: Optical observations
  64. GRB 011121: Third HST Epoch
  65. GRB020305: Properties of the Candidate Optical Afterglow
  66. GRB 011121: HST Observations reveal an intermediate-time multicolor
  67. GRB011121, possible supernova association
  68. GRB011130 (XRF011130) Second Epoch Chandra Observations
  69. GRB020305: Subaru Optical Observations
  70. GRB 020305: Optical observations
  71. XRF/GRB 011030 Images
  72. XRF/GRB 011030: Detection of the Probable Host Galaxy
  73. GRB 020305: Candidate optical afterglow
  74. Type Ic SN2002bl (SN/GRB?) Radio Observations
  75. GRB020305, optical observations
  76. IPN triangulation of GRB020305 (HETE 1939)
  77. GRB020305 (=H1939): Localization of a GRB by HETE
  78. GRB 020305: Optical observations
  79. HST Imaging of the afterglow and host of GRB 011121
  80. GRB 010921: HST Observations
  81. IPN detection and localization of Cygnus X-1 flares
  82. GRB020127: Further VLA Observations of Possible Counterparts
  83. RXTE Observations of SGR 1900+14
  84. IPN detection of further SGR1900+14 activity
  85. SGR1900+14 activity
  86. IPN/HETE Detection of Bursts from SGR1900+14
  87. IPN Upper Limits to a GRB Associated With SN2002ap
  88. GRB020124 BVRI field photometry
  89. GRB020127: Palomar and VLA Observations of Possible Counterparts
  90. GRB020127: Comparison of Chandra Epochs and Identification of Possible Counterparts
  91. SN2002ap (SN/GRB?) Echelle spectra
  92. SN2002ap (SN/GRB?) optical spectrographic observations
  93. GRB020127, WSRT radio observations
  94. GRB020127 Optical Observations
  95. SN 2002ap (SN/GRB?)
  96. SN 2002ap in M74
  97. SN2002ap (SN/GRB?) UBVRI Field Photometry
  98. GRB020127: Chandra Observations and Prospective Counterparts
  99. pre-SN2002ap (SN/GRB?) imaging of M74
  100. SN 2002ap (hypernova / GRB ??): special list on VSNET

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