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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"

32689 results found.

  1. GRB 020409, No Optical Detection to R = 20
  2. GRB 020409: Optical observations
  3. GRB 020410, optical observations
  4. GRB 020409, optical observations
  5. GRB 020409: Optical Observations
  6. GRB020406(?), optical observations
  7. X-ray afterglow of GRB020321
  8. GRB020331: Confirmation of Afterglow Candidate with Magellan
  9. GRB020405: VLT optical observations and V band decay slope
  10. GRB020331 optical observations with RIMOTS
  11. GRB020124 optical observations with RIBOTS/RIMOTS
  12. GRB 020321: Candidate X-ray Counterparts
  13. ASM GRB candidate 020406 refined error box
  14. GRB 020405: Moderate-resolution spectroscopy
  15. GRB020331: Optical Observations of Afterglow Candidate
  16. GRB020406(?), optical observations
  17. GRB020405: VLT optical observations
  18. Revised Photometry of the Optical Afterglow of GRB 020405
  19. GRB020405: OT observations
  20. GRB 020331: Candidate Optical Afterglow
  21. GRB 020405: Decay index
  22. GRB020405, Radio Observations
  23. GRB020405: VLT spectroscopy
  24. Fading Optical Afterglow and Possible Host Galaxy of GRB 020405
  25. V band observations of GRB020405
  26. GRB 020405, U-band observations
  27. IPN localization of GRB020405
  28. GRB011212: Optical Observations
  29. GRB 020331: NIR Observations
  30. GRB 020331: NIR Observations
  31. GRB020331 field photometry
  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. GRB 020322: Optical Sources and Improved Astrometry
  53. GRB020322, optical observations
  54. GRB 020322: Optical candidate
  55. XMM-Newton observation of GRB020322
  56. GRB020322: Optical Observations
  57. GRB 020321: Optical observations
  58. GRB 011121: Fourth Epoch of HST Imaging
  59. GRB020317: optical observations
  60. GRB020321 optical observations
  61. GRB020305: NIR observations
  62. GRB 020317 : KISO Optical Observations
  63. GRB020317 (=H1959): Localization by HETE of a Low Fluence GRB
  64. GRB 020305: Optical Observations
  65. GRB020317, optical observations
  66. GRB 011121: Third HST Epoch
  67. GRB020305: Properties of the Candidate Optical Afterglow
  68. GRB 011121: HST Observations reveal an intermediate-time multicolor
  69. GRB011121, possible supernova association
  70. GRB011130 (XRF011130) Second Epoch Chandra Observations
  71. GRB020305: Subaru Optical Observations
  72. GRB 020305: Optical observations
  73. XRF/GRB 011030 Images
  74. XRF/GRB 011030: Detection of the Probable Host Galaxy
  75. GRB 020305: Candidate optical afterglow
  76. Type Ic SN2002bl (SN/GRB?) Radio Observations
  77. GRB020305 (=H1939): Localization of a GRB by HETE
  78. HST Imaging of the afterglow and host of GRB 011121
  79. GRB 010921: HST Observations
  80. GRB020127: Further VLA Observations of Possible Counterparts
  81. IPN detection of further SGR1900+14 activity
  82. SGR1900+14 activity
  83. GRB020124 BVRI field photometry
  84. GRB020127: Palomar and VLA Observations of Possible Counterparts
  85. GRB020127, WSRT radio observations
  86. GRB020127 Optical Observations
  87. SN2002ap (SN/GRB?) UBVRI Field Photometry
  88. GRB020127: Chandra Observations and Prospective Counterparts
  89. pre-SN2002ap (SN/GRB?) imaging of M74
  90. Type Ib/c SN2002ap (SN/GRB?)
  91. GRB020127: Optical observations
  92. GRB 020127, I-band observations starting 3.14-hr after the event
  93. IPN triangulation of GRB020127 (=H1902)
  94. GRB020127 Optical Observations -- Erratum to GCN 1230
  95. GRB010921 Optical Observations
  96. GRB020127(=H1902): Localization of a Double-Peaked GRB by HETE
  97. GRB020124: Optical observations
  98. VLT observations of GRB 020124: The fading optical/near-infrared afterglow
  99. GRB020124: Optical observations
  100. GRB 020124: Optical observations

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