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GCN Circulars

GCN Circulars are rapid bulletins submitted by and distributed to the community. 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"

36079 results found.

  1. GRB 020409: No Evidence for an Optical Afterglow
  2. GRB 020409, 2nd epoch optical observations
  3. GRB 020331 Kyoto observation on March 31
  4. GRB 020409
  5. GRB 020409 SARA Observations
  6. GRB "020411"
  7. GRB 020409, No Optical Detection to R = 20
  8. GRB020410: BeppoSAX NFI observation
  9. GRB 020409: Optical observations
  10. April 11 BeppoSAX event (GRB020411) is likely not a GRB
  11. GRB 020410, optical observations
  12. BeppoSAX ALERT: possible GRB020411
  13. GRB 020409, optical observations
  14. GRB 020409: Optical Observations
  15. GRB020406(?), optical observations
  16. GRB020410, optical observations
  17. BeppoSAX ALERT: possible GRB020410
  18. X-ray afterglow of GRB020321
  19. BeppoSAX GRB : GRB020409
  20. GRB020405: VLT optical observations and V band decay slope
  21. GRB020331 optical observations with RIMOTS
  22. GRB020124 optical observations with RIBOTS/RIMOTS
  23. GRB 020321: Candidate X-ray Counterparts
  24. ASM GRB candidate 020406 refined error box
  25. GRB 020405: Moderate-resolution spectroscopy
  26. GRB020406(?), optical observations
  27. GRB020405: VLT optical observations
  28. Revised Photometry of the Optical Afterglow of GRB 020405
  29. GRB020405: OT observations
  30. GRB 020331: Candidate Optical Afterglow
  31. GRB 020405: Decay index
  32. Short RXTE/ASM transient 020406; may be a GRB
  33. GRB020405, Radio Observations
  34. Fading Optical Afterglow and Possible Host Galaxy of GRB 020405
  35. GRB 020405, U-band observations
  36. GRB 020405: Optical afterglow candidate
  37. IPN localization of GRB020405
  38. GRB011212: Optical Observations
  39. GRB 020331: NIR Observations
  40. GRB 020331: NIR Observations
  41. GRB020331 NIR observation at KPNO (re-submission)
  42. GRB02033 NIR observation at KPNO
  43. GRB020331 field photometry
  44. GRB 020331 Optical Observations
  45. GRB 020331, NIR observations
  46. GRB 020331: Optical observations
  47. GRB020331(=H1963): The "Easter" Burst Detected by HETE
  48. GRB 020321: Infrared observations
  49. GRB 020322: BeppoSAX observations of the X-ray afterglow
  50. SN 2002ap - peak brightness date (SN/GRB?)
  51. GRB 020322, Radio observations
  52. Near-Infrared Observations of GRB020322 at TIRGO
  53. GRB 020321, Radio Observations
  54. GRB 020322: Optical Observations
  55. GRB020127: Proposed Host Galaxy Detection and Identification of Afterglow
  56. GRB 020321: Optical observations
  57. GRB020317 BVRI field photometry
  58. GRB011211 revised BVRI field photometry
  59. GRB020305 BVRI field photometry
  60. GRB020322 BVRI field photometry
  61. GRB 020322 optical observations
  62. GRB 020322 optical observation
  63. GRB020317 : Near IR Observations from Mt Abu Observatory
  64. GRB 020322: Optical Sources and Improved Astrometry
  65. GRB020322, optical observations
  66. GRB 020322: Optical candidate
  67. GRB020322: BeppoSAX/NFI Observations
  68. Bepposax GRB020322 The second springtime BSAX GRB
  69. GRB 020321: Optical observations
  70. GRB 011121: Fourth Epoch of HST Imaging
  71. GRB020317: optical observations
  72. GRB020321 optical observations
  73. GRB020321: BeppoSAX/NFI Observations
  74. GRB020321: a faint BeppoSAX detection
  75. GRB 020317 : KISO Optical Observations
  76. BeppoSAX ALERT: GRB020321, the "Springtime Burst"
  77. GRB020317 (=H1959): Localization by HETE of a Low Fluence GRB
  78. GRB 020305: Optical Observations
  79. GRB020317, optical observations
  80. GRB 020317: Optical observations
  81. GRB 011121: Third HST Epoch
  82. GRB020305: Properties of the Candidate Optical Afterglow
  83. GRB 011121: HST Observations reveal an intermediate-time multicolor
  84. GRB011121, possible supernova association
  85. GRB011130 (XRF011130) Second Epoch Chandra Observations
  86. GRB020305: Subaru Optical Observations
  87. GRB 020305: Optical observations
  88. XRF/GRB 011030 Images
  89. XRF/GRB 011030: Detection of the Probable Host Galaxy
  90. GRB 020305: Candidate optical afterglow
  91. Type Ic SN2002bl (SN/GRB?) Radio Observations
  92. GRB020305: Optical Observations
  93. IPN triangulation of GRB020305 (HETE 1939)
  94. GRB020305 (=H1939): Localization of a GRB by HETE
  95. GRB 020305: Optical observations
  96. HST Imaging of the afterglow and host of GRB 011121
  97. GRB 010921: HST Observations
  98. IPN detection and localization of Cygnus X-1 flares
  99. GRB020127: Further VLA Observations of Possible Counterparts
  100. IPN detection of further SGR1900+14 activity

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