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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"

45431 results found.

  1. GRB020406(?), optical observations
  2. GRB020410, optical observations
  3. BeppoSAX ALERT: possible GRB020410
  4. X-ray afterglow of GRB020321
  5. GRB020331: Confirmation of Afterglow Candidate with Magellan
  6. GRB020405: VLT optical observations and V band decay slope
  7. GRB020331 optical observations with RIMOTS
  8. GRB020124 optical observations with RIBOTS/RIMOTS
  9. GRB 020321: Candidate X-ray Counterparts
  10. ASM GRB candidate 020406 refined error box
  11. GRB 020405: Moderate-resolution spectroscopy
  12. GRB020331: Optical Observations of Afterglow Candidate
  13. GRB020406(?), optical observations
  14. GRB020405: VLT optical observations
  15. Revised Photometry of the Optical Afterglow of GRB 020405
  16. GRB020405: OT observations
  17. GRB 020331: Candidate Optical Afterglow
  18. GRB 020405: Decay index
  19. Short RXTE/ASM transient 020406; may be a GRB
  20. GRB020405, Radio Observations
  21. GRB020405: VLT spectroscopy
  22. Fading Optical Afterglow and Possible Host Galaxy of GRB 020405
  23. V band observations of GRB020405
  24. GRB 020405, U-band observations
  25. GRB 020405: Optical afterglow candidate
  26. IPN localization of GRB020405
  27. GRB011212: Optical Observations
  28. GRB 020331: NIR Observations
  29. GRB 020331: NIR Observations
  30. GRB020331 NIR observation at KPNO (re-submission)
  31. GRB02033 NIR observation at KPNO
  32. GRB020331 field photometry
  33. GRB 020331 Optical Observations
  34. GRB 020331, NIR observations
  35. GRB 020331: Optical observations
  36. GRB020331(=H1963): The "Easter" Burst Detected by HETE
  37. GRB 020321: Infrared observations
  38. GRB 020322: BeppoSAX observations of the X-ray afterglow
  39. SN 2002ap - peak brightness date (SN/GRB?)
  40. GRB011211: HST Observations of Optical Afterglow and Host Galaxy
  41. GRB 020322, Radio observations
  42. Near-Infrared Observations of GRB020322 at TIRGO
  43. GRB 020321, Radio Observations
  44. GRB 020322: Optical Observations
  45. GRB020127: Proposed Host Galaxy Detection and Identification of Afterglow
  46. GRB 020321: Optical observations
  47. GRB020317 BVRI field photometry
  48. GRB011211 revised BVRI field photometry
  49. GRB020305 BVRI field photometry
  50. GRB020322 BVRI field photometry
  51. GRB 020322 optical observations
  52. GRB020322: Candidate Optical Afterglow
  53. GRB 020322 optical observation
  54. GRB020317 : Near IR Observations from Mt Abu Observatory
  55. GRB 020322: Optical Sources and Improved Astrometry
  56. GRB020322, optical observations
  57. GRB 020322: Optical candidate
  58. XMM-Newton observation of GRB020322
  59. GRB020322: Optical Observations
  60. GRB020322: BeppoSAX/NFI Observations
  61. GRB 020321: Optical observations
  62. GRB 011121: Fourth Epoch of HST Imaging
  63. GRB020317: optical observations
  64. GRB020321 optical observations
  65. GRB020321: BeppoSAX/NFI Observations
  66. GRB020321: a faint BeppoSAX detection
  67. GRB020305: NIR observations
  68. GRB 020317 : KISO Optical Observations
  69. BeppoSAX ALERT: GRB020321, the "Springtime Burst"
  70. GRB020317 (=H1959): Localization by HETE of a Low Fluence GRB
  71. GRB 020305: Optical Observations
  72. GRB020317, optical observations
  73. GRB 020317: Optical observations
  74. GRB 011121: Third HST Epoch
  75. GRB020305: Properties of the Candidate Optical Afterglow
  76. GRB 011121: HST Observations reveal an intermediate-time multicolor
  77. GRB011121, possible supernova association
  78. GRB011130 (XRF011130) Second Epoch Chandra Observations
  79. GRB020305: Subaru Optical Observations
  80. GRB 020305: Optical observations
  81. XRF/GRB 011030 Images
  82. XRF/GRB 011030: Detection of the Probable Host Galaxy
  83. GRB 020305: Candidate optical afterglow
  84. Type Ic SN2002bl (SN/GRB?) Radio Observations
  85. GRB020305, optical observations
  86. GRB020305: Optical Observations
  87. IPN triangulation of GRB020305 (HETE 1939)
  88. GRB020305 (=H1939): Localization of a GRB by HETE
  89. GRB 020305: Optical observations
  90. HST Imaging of the afterglow and host of GRB 011121
  91. GRB 010921: HST Observations
  92. IPN detection and localization of Cygnus X-1 flares
  93. GRB020127: Further VLA Observations of Possible Counterparts
  94. RXTE Observations of SGR 1900+14
  95. IPN detection of further SGR1900+14 activity
  96. SGR1900+14 activity
  97. IPN/HETE Detection of Bursts from SGR1900+14
  98. IPN Upper Limits to a GRB Associated With SN2002ap
  99. GRB020124 BVRI field photometry
  100. GRB020127: Palomar and VLA Observations of Possible Counterparts

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