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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"

35959 results found.

  1. GRB020331 optical observations with RIMOTS
  2. GRB020124 optical observations with RIBOTS/RIMOTS
  3. GRB 020321: Candidate X-ray Counterparts
  4. ASM GRB candidate 020406 refined error box
  5. GRB 020405: Moderate-resolution spectroscopy
  6. GRB020406(?), optical observations
  7. GRB020405: VLT optical observations
  8. Revised Photometry of the Optical Afterglow of GRB 020405
  9. GRB020405: OT observations
  10. GRB 020331: Candidate Optical Afterglow
  11. GRB 020405: Decay index
  12. Short RXTE/ASM transient 020406; may be a GRB
  13. GRB020405, Radio Observations
  14. Fading Optical Afterglow and Possible Host Galaxy of GRB 020405
  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. GRB 020322, Radio observations
  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. GRB020322: BeppoSAX/NFI Observations
  48. Bepposax GRB020322 The second springtime BSAX GRB
  49. GRB 020321: Optical observations
  50. GRB 011121: Fourth Epoch of HST Imaging
  51. GRB020317: optical observations
  52. GRB020321 optical observations
  53. GRB020321: BeppoSAX/NFI Observations
  54. GRB020321: a faint BeppoSAX detection
  55. GRB 020317 : KISO Optical Observations
  56. BeppoSAX ALERT: GRB020321, the "Springtime Burst"
  57. GRB020317 (=H1959): Localization by HETE of a Low Fluence GRB
  58. GRB 020305: Optical Observations
  59. GRB020317, optical observations
  60. GRB 020317: Optical observations
  61. GRB 011121: Third HST Epoch
  62. GRB020305: Properties of the Candidate Optical Afterglow
  63. GRB 011121: HST Observations reveal an intermediate-time multicolor
  64. GRB011121, possible supernova association
  65. GRB011130 (XRF011130) Second Epoch Chandra Observations
  66. GRB020305: Subaru Optical Observations
  67. GRB 020305: Optical observations
  68. XRF/GRB 011030 Images
  69. XRF/GRB 011030: Detection of the Probable Host Galaxy
  70. GRB 020305: Candidate optical afterglow
  71. Type Ic SN2002bl (SN/GRB?) Radio Observations
  72. GRB020305: Optical Observations
  73. IPN triangulation of GRB020305 (HETE 1939)
  74. GRB020305 (=H1939): Localization of a GRB by HETE
  75. GRB 020305: Optical observations
  76. HST Imaging of the afterglow and host of GRB 011121
  77. GRB 010921: HST Observations
  78. IPN detection and localization of Cygnus X-1 flares
  79. GRB020127: Further VLA Observations of Possible Counterparts
  80. IPN detection of further SGR1900+14 activity
  81. SGR1900+14 activity
  82. IPN/HETE Detection of Bursts from SGR1900+14
  83. IPN Upper Limits to a GRB Associated With SN2002ap
  84. GRB020124 BVRI field photometry
  85. GRB020127: Comparison of Chandra Epochs and Identification of Possible Counterparts
  86. SN2002ap (SN/GRB?) Echelle spectra
  87. SN2002ap (SN/GRB?) optical spectrographic observations
  88. GRB020127 Optical Observations
  89. SN 2002ap (SN/GRB?)
  90. SN2002ap (SN/GRB?) UBVRI Field Photometry
  91. GRB020127: Chandra Observations and Prospective Counterparts
  92. pre-SN2002ap (SN/GRB?) imaging of M74
  93. SN 2002ap (hypernova / GRB ??): special list on VSNET
  94. Type Ib/c SN2002ap (SN/GRB?)
  95. Type Ib/c SN2002ap (SN/GRB?) Radio Observations
  96. GRB020124, optical observations
  97. GRB020127: Optical observations
  98. GRB 020127, I-band observations starting 3.14-hr after the event
  99. IPN detection of further activity from SGR1806-20
  100. IPN triangulation of GRB020127 (=H1902)

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