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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"

45650 results found.

  1. X-ray afterglow of GRB020321
  2. BeppoSAX GRB : GRB020409
  3. GRB020331: Confirmation of Afterglow Candidate with Magellan
  4. GRB020405: VLT optical observations and V band decay slope
  5. GRB020331 optical observations with RIMOTS
  6. GRB020124 optical observations with RIBOTS/RIMOTS
  7. GRB 020321: Candidate X-ray Counterparts
  8. ASM GRB candidate 020406 refined error box
  9. GRB 020405: Moderate-resolution spectroscopy
  10. GRB020331: Optical Observations of Afterglow Candidate
  11. GRB020406(?), optical observations
  12. GRB020405: VLT optical observations
  13. Revised Photometry of the Optical Afterglow of GRB 020405
  14. GRB020405: OT observations
  15. GRB 020331: Candidate Optical Afterglow
  16. GRB 020405: Decay index
  17. Short RXTE/ASM transient 020406; may be a GRB
  18. GRB020405, Radio Observations
  19. GRB020405: VLT spectroscopy
  20. Fading Optical Afterglow and Possible Host Galaxy of GRB 020405
  21. V band observations of GRB020405
  22. GRB 020405, U-band observations
  23. GRB 020405: Optical afterglow candidate
  24. IPN localization of GRB020405
  25. GRB011212: Optical Observations
  26. GRB 020331: NIR Observations
  27. GRB 020331: NIR Observations
  28. GRB020331 NIR observation at KPNO (re-submission)
  29. GRB02033 NIR observation at KPNO
  30. GRB020331 field photometry
  31. GRB 020331 Optical Observations
  32. GRB 020331, NIR observations
  33. GRB 020331: Optical observations
  34. GRB020331(=H1963): The "Easter" Burst Detected by HETE
  35. GRB 020321: Infrared observations
  36. GRB 020322: BeppoSAX observations of the X-ray afterglow
  37. SN 2002ap - peak brightness date (SN/GRB?)
  38. GRB011211: HST Observations of Optical Afterglow and Host Galaxy
  39. GRB 020322, Radio observations
  40. Near-Infrared Observations of GRB020322 at TIRGO
  41. GRB 020321, Radio Observations
  42. GRB 020322: Optical Observations
  43. GRB020127: Proposed Host Galaxy Detection and Identification of Afterglow
  44. GRB 020321: Optical observations
  45. GRB020317 BVRI field photometry
  46. GRB011211 revised BVRI field photometry
  47. GRB020305 BVRI field photometry
  48. GRB020322 BVRI field photometry
  49. GRB 020322 optical observations
  50. GRB020322: Candidate Optical Afterglow
  51. GRB 020322 optical observation
  52. GRB020317 : Near IR Observations from Mt Abu Observatory
  53. GRB 020322: Optical Sources and Improved Astrometry
  54. GRB020322, optical observations
  55. GRB 020322: Optical candidate
  56. XMM-Newton observation of GRB020322
  57. GRB020322: Optical Observations
  58. GRB020322: BeppoSAX/NFI Observations
  59. Bepposax GRB020322 The second springtime BSAX GRB
  60. GRB 020321: Optical observations
  61. GRB 011121: Fourth Epoch of HST Imaging
  62. GRB020317: optical observations
  63. GRB020321 optical observations
  64. GRB020321: BeppoSAX/NFI Observations
  65. GRB020321: a faint BeppoSAX detection
  66. GRB020305: NIR observations
  67. GRB 020317 : KISO Optical Observations
  68. BeppoSAX ALERT: GRB020321, the "Springtime Burst"
  69. GRB020317 (=H1959): Localization by HETE of a Low Fluence GRB
  70. GRB 020305: Optical Observations
  71. GRB020317, optical observations
  72. GRB 020317: Optical observations
  73. GRB 011121: Third HST Epoch
  74. GRB020305: Properties of the Candidate Optical Afterglow
  75. GRB 011121: HST Observations reveal an intermediate-time multicolor
  76. GRB011121, possible supernova association
  77. GRB011130 (XRF011130) Second Epoch Chandra Observations
  78. GRB020305: Subaru Optical Observations
  79. GRB 020305: Optical observations
  80. XRF/GRB 011030 Images
  81. XRF/GRB 011030: Detection of the Probable Host Galaxy
  82. GRB 020305: Candidate optical afterglow
  83. Type Ic SN2002bl (SN/GRB?) Radio Observations
  84. GRB020305, optical observations
  85. GRB020305: Optical Observations
  86. IPN triangulation of GRB020305 (HETE 1939)
  87. GRB020305 (=H1939): Localization of a GRB by HETE
  88. GRB 020305: Optical observations
  89. HST Imaging of the afterglow and host of GRB 011121
  90. GRB 010921: HST Observations
  91. IPN detection and localization of Cygnus X-1 flares
  92. GRB020127: Further VLA Observations of Possible Counterparts
  93. RXTE Observations of SGR 1900+14
  94. IPN detection of further SGR1900+14 activity
  95. SGR1900+14 activity
  96. IPN/HETE Detection of Bursts from SGR1900+14
  97. IPN Upper Limits to a GRB Associated With SN2002ap
  98. GRB020124 BVRI field photometry
  99. GRB020127: Palomar and VLA Observations of Possible Counterparts
  100. GRB020127: Comparison of Chandra Epochs and Identification of Possible Counterparts

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