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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"

32491 results found.

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

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