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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"

35258 results found.

  1. GRB020124 optical observations with RIBOTS/RIMOTS
  2. GRB 020321: Candidate X-ray Counterparts
  3. ASM GRB candidate 020406 refined error box
  4. GRB 020405: Moderate-resolution spectroscopy
  5. GRB020406(?), optical observations
  6. GRB020405: VLT optical observations
  7. Revised Photometry of the Optical Afterglow of GRB 020405
  8. GRB020405: OT observations
  9. GRB 020331: Candidate Optical Afterglow
  10. GRB 020405: Decay index
  11. Short RXTE/ASM transient 020406; may be a GRB
  12. GRB020405, Radio Observations
  13. Fading Optical Afterglow and Possible Host Galaxy of GRB 020405
  14. GRB 020405, U-band observations
  15. GRB 020405: Optical afterglow candidate
  16. IPN localization of GRB020405
  17. GRB011212: Optical Observations
  18. GRB 020331: NIR Observations
  19. GRB 020331: NIR Observations
  20. GRB020331 NIR observation at KPNO (re-submission)
  21. GRB02033 NIR observation at KPNO
  22. GRB020331 field photometry
  23. GRB 020331 Optical Observations
  24. GRB 020331, NIR observations
  25. GRB 020331: Optical observations
  26. GRB020331(=H1963): The "Easter" Burst Detected by HETE
  27. GRB 020321: Infrared observations
  28. GRB 020322: BeppoSAX observations of the X-ray afterglow
  29. SN 2002ap - peak brightness date (SN/GRB?)
  30. GRB 020322, Radio observations
  31. Near-Infrared Observations of GRB020322 at TIRGO
  32. GRB 020321, Radio Observations
  33. GRB 020322: Optical Observations
  34. GRB020127: Proposed Host Galaxy Detection and Identification of Afterglow
  35. GRB 020321: Optical observations
  36. GRB020317 BVRI field photometry
  37. GRB011211 revised BVRI field photometry
  38. GRB020305 BVRI field photometry
  39. GRB020322 BVRI field photometry
  40. GRB 020322 optical observations
  41. GRB 020322 optical observation
  42. GRB020317 : Near IR Observations from Mt Abu Observatory
  43. GRB 020322: Optical Sources and Improved Astrometry
  44. GRB020322, optical observations
  45. GRB 020322: Optical candidate
  46. GRB020322: BeppoSAX/NFI Observations
  47. Bepposax GRB020322 The second springtime BSAX GRB
  48. GRB 020321: Optical observations
  49. GRB 011121: Fourth Epoch of HST Imaging
  50. GRB020317: optical observations
  51. GRB020321 optical observations
  52. GRB020321: BeppoSAX/NFI Observations
  53. GRB020321: a faint BeppoSAX detection
  54. GRB 020317 : KISO Optical Observations
  55. BeppoSAX ALERT: GRB020321, the "Springtime Burst"
  56. GRB020317 (=H1959): Localization by HETE of a Low Fluence GRB
  57. GRB 020305: Optical Observations
  58. GRB020317, optical observations
  59. GRB 020317: Optical observations
  60. GRB 011121: Third HST Epoch
  61. GRB020305: Properties of the Candidate Optical Afterglow
  62. GRB 011121: HST Observations reveal an intermediate-time multicolor
  63. GRB011121, possible supernova association
  64. GRB011130 (XRF011130) Second Epoch Chandra Observations
  65. GRB020305: Subaru Optical Observations
  66. GRB 020305: Optical observations
  67. XRF/GRB 011030 Images
  68. XRF/GRB 011030: Detection of the Probable Host Galaxy
  69. GRB 020305: Candidate optical afterglow
  70. Type Ic SN2002bl (SN/GRB?) Radio Observations
  71. GRB020305: Optical Observations
  72. IPN triangulation of GRB020305 (HETE 1939)
  73. GRB020305 (=H1939): Localization of a GRB by HETE
  74. GRB 020305: Optical observations
  75. HST Imaging of the afterglow and host of GRB 011121
  76. GRB 010921: HST Observations
  77. IPN detection and localization of Cygnus X-1 flares
  78. GRB020127: Further VLA Observations of Possible Counterparts
  79. IPN detection of further SGR1900+14 activity
  80. SGR1900+14 activity
  81. IPN/HETE Detection of Bursts from SGR1900+14
  82. IPN Upper Limits to a GRB Associated With SN2002ap
  83. GRB020124 BVRI field photometry
  84. GRB020127: Comparison of Chandra Epochs and Identification of Possible Counterparts
  85. SN2002ap (SN/GRB?) Echelle spectra
  86. SN2002ap (SN/GRB?) optical spectrographic observations
  87. GRB020127 Optical Observations
  88. SN 2002ap (SN/GRB?)
  89. SN2002ap (SN/GRB?) UBVRI Field Photometry
  90. GRB020127: Chandra Observations and Prospective Counterparts
  91. pre-SN2002ap (SN/GRB?) imaging of M74
  92. SN 2002ap (hypernova / GRB ??): special list on VSNET
  93. Type Ib/c SN2002ap (SN/GRB?)
  94. Type Ib/c SN2002ap (SN/GRB?) Radio Observations
  95. GRB020124, optical observations
  96. GRB020127: Optical observations
  97. GRB 020127, I-band observations starting 3.14-hr after the event
  98. IPN detection of further activity from SGR1806-20
  99. IPN triangulation of GRB020127 (=H1902)
  100. GRB010921 Optical Observations

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