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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"

15716 results found.

  1. GRB 020531, simultaneous optical observations
  2. GRB 020604, optical observations
  3. GRB020604, optical observations
  4. GRB020531 Optical observations with TAROT
  5. GRB020531 Optical observations with TAROT
  6. GRB 020418, optical/near-IR observations
  7. GRB020531 Optical Observations
  8. GRB020531: Observations with the Chandra X-ray Observatory
  9. GRB 020603: Optical Observations
  10. GRB 020603: Optical observations
  11. GRB 020531 optical observations with TAROT
  12. GRB020531, optical observations
  13. GRB020531: optical observations
  14. GRB020531, optical observation
  15. GRB020531(=H2042): Optical Observations
  16. GRB020531(=H2042): Optical Observations
  17. GRB020531: Optical observations
  18. GRB020531(=H2042): A Short, Hard Burst Localized by HETE
  19. GRB 020525: Optical Observations
  20. GRB020525, optical observations
  21. HETE Observations of GX354-0 (= MXB1728-34, so-called "Slow
  22. HST detection of the likely host galaxy of GRB 020124
  23. GRB020321 : Optical observations.
  24. GRB020331: Third Epoch and Revised Second Epoch Optical
  25. The end of BSAX GRB activities
  26. GRB 020418: Optical observations
  27. GRB 020124: Optical observations
  28. GRB 020418: Optical observations
  29. GRB 020409: Optical Observations
  30. GRB 020409, 2-nd epoch optical observations at Terskol.
  31. GRB 020409: Optical observations
  32. GRB 020409, No Optical Detection to R = 22
  33. GRB 020409: No Evidence for an Optical Afterglow
  34. GRB 020409, 2nd epoch optical observations
  35. GRB 020331 Kyoto observation on March 31
  36. GRB 020409, No Optical Detection to R = 20
  37. GRB 020409: Optical observations
  38. GRB 020410, optical observations
  39. GRB 020409, optical observations
  40. GRB 020409: Optical Observations
  41. GRB020406(?), optical observations
  42. GRB020410, optical observations
  43. X-ray afterglow of GRB020321
  44. GRB020331: Confirmation of Afterglow Candidate with Magellan
  45. GRB020405: VLT optical observations and V band decay slope
  46. GRB020331 optical observations with RIMOTS
  47. GRB020124 optical observations with RIBOTS/RIMOTS
  48. GRB020331: Optical Observations of Afterglow Candidate
  49. GRB020406(?), optical observations
  50. GRB020405: VLT optical observations
  51. Revised Photometry of the Optical Afterglow of GRB 020405
  52. GRB 020331: Candidate Optical Afterglow
  53. GRB 020405: Decay index
  54. GRB020405, Radio Observations
  55. Fading Optical Afterglow and Possible Host Galaxy of GRB 020405
  56. GRB 020405, U-band observations
  57. GRB 020405: Optical afterglow candidate
  58. GRB011212: Optical Observations
  59. GRB 020331 Optical Observations
  60. GRB 020331: Optical observations
  61. GRB020331(=H1963): The "Easter" Burst Detected by HETE
  62. GRB011211: HST Observations of Optical Afterglow and Host Galaxy
  63. GRB 020322, Radio observations
  64. Near-Infrared Observations of GRB020322 at TIRGO
  65. GRB 020322: Optical Observations
  66. GRB 020321: Optical observations
  67. GRB020317 BVRI field photometry
  68. GRB011211 revised BVRI field photometry
  69. GRB020305 BVRI field photometry
  70. GRB020322 BVRI field photometry
  71. GRB 020322 optical observations
  72. GRB020322: Candidate Optical Afterglow
  73. GRB 020322 optical observation
  74. GRB 020322: Optical Sources and Improved Astrometry
  75. GRB020322, optical observations
  76. GRB 020322: Optical candidate
  77. GRB020322: Optical Observations
  78. GRB 020321: Optical observations
  79. GRB 011121: Fourth Epoch of HST Imaging
  80. GRB020317: optical observations
  81. GRB020321 optical observations
  82. GRB 020317 : KISO Optical Observations
  83. GRB020317 (=H1959): Localization by HETE of a Low Fluence GRB
  84. GRB 020305: Optical Observations
  85. GRB020317, optical observations
  86. GRB 020317: Optical observations
  87. GRB020305: Properties of the Candidate Optical Afterglow
  88. GRB 011121: HST Observations reveal an intermediate-time multicolor
  89. GRB020305: Subaru Optical Observations
  90. GRB 020305: Optical observations
  91. XRF/GRB 011030: Detection of the Probable Host Galaxy
  92. GRB 020305: Candidate optical afterglow
  93. Type Ic SN2002bl (SN/GRB?) Radio Observations
  94. GRB020305, optical observations
  95. GRB020305: Optical Observations
  96. IPN triangulation of GRB020305 (HETE 1939)
  97. GRB020305 (=H1939): Localization of a GRB by HETE
  98. GRB 020305: Optical observations
  99. HST Imaging of the afterglow and host of GRB 011121
  100. GRB020124 BVRI field photometry

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