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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"

44421 results found.

  1. BeppoSAX GRB: extension of BSAX operations upto April 30, 2002
  2. BeppoSAX GRB ALERT: GRB010412
  3. GRB Observation Report
  4. GRB010324, revised field photometry
  5. REVISED LOCATION OF GRB010326A
  6. GRB 980326: Late-time HST/STIS observations
  7. GRB010324, field photometry
  8. GRB010326B, field photometry
  9. GRB010326, field photometry
  10. GRB010220, field photometry
  11. Further Optical Observations of GRB 010324
  12. GRB010222, CXO X-ray observations
  13. GRB 010326A: Further optical observations
  14. GRB010324: BeppoSAX/GRBM data
  15. GRB 010326B: Optical observations
  16. GRB010324, optical observations
  17. GRB010326B: Localization by HETE (2nd GRB for this date)
  18. GRB 010326: Optical observations
  19. GRB 010326 optical observations
  20. GRB010326: Refined Localization by HETE
  21. GRB010326: Localization by HETE
  22. Duration, ECT, peak flux and fluence of GRB010324
  23. Optical Observations of GRB 010324
  24. IPN TRIANGULATION OF GRB010324
  25. GRB990705, VLT-FORS1 observations of the host galaxy
  26. GRB010222, late-time optical observation
  27. Support extension to the BeppoSAX mission
  28. GRB 010222 - HEGRA GeV/TeV Observations
  29. Congratulate Scott on the 1000th GRB Coordinates Network Circular!
  30. GRB010222: Chandra X-ray Observatory Observation
  31. GRB010222: Sub-millimeter vanishing act
  32. GRB010222 - Optical observation
  33. GRB 010222, Optical Observations
  34. GRB010220 optical obsercations
  35. GRB010222 - Optical observation
  36. GRB 010222: High-Resolution Keck Spectroscopy
  37. GRB010222: Optical observation and decay
  38. GRB 010214, I-band data
  39. Sub-millimeter Excess/GRB 010222
  40. GRB 010222
  41. GRB 010222 HST/Chandra TOO
  42. GRB 010222
  43. GRB010222 further R-band photometry
  44. GRB010222: R-band data
  45. GRB010222 Optical observations
  46. GRB 010222: Keck Spectroscopy
  47. GRB010214, field photometry
  48. GRB010222, field photometry
  49. GRB010222 further R-band photometry
  50. GRB010222, possible increase of optical decay slope
  51. GRB 010222 Kyoto optical observation
  52. GRB010222: fading behavior
  53. GRB 010222 BV optical observations
  54. GRB010220, Optical Observations
  55. GRB010222 R-BAND OBSERVATION
  56. GRB 010220: Near-IR Observations
  57. GRB010214 follow-up from Hanle
  58. GRB 010222: Near-IR Observations
  59. GRB 010222: Optical Observations
  60. GRB 010222, Decay Slope Confirmed
  61. GRB010222: Another absorption line system
  62. GRB010222: Optical decay slope
  63. GRB 010214, Optical Observations
  64. GRB010222: Sub-millimeter detection
  65. GRB010222: R-band fading behavior
  66. GRB010222: Optical Observations
  67. GRB010222, radio observations
  68. GRB010222, optical observations
  69. GRB010222: BeppoSAX/NFI Observations
  70. Redshift of the Optical Transient of GRB010222
  71. GRB010214B,Gamma Ray Observations
  72. GRB010222: possible optical counterpart
  73. GRB010222
  74. GRB010222: BeppoSAX refined position
  75. ALERT: GRB010222: the brightest GRB observed by BeppoSAX
  76. GRB010220, Radio and Optical Observations
  77. GRB 010220, simultaneous optical observations
  78. GRB010220: BeppoSAX WFC and GRBM preliminary data
  79. GRB010214, candidate optical afterglow
  80. GRB010214, optical observations
  81. BeppoSAX GRB010220: refined position
  82. BeppoSAX ALERT: GRB010220
  83. GRB010214: BeppoSAX WFC and GRBM preliminary data
  84. GRB 010214: X-Ray afterglow
  85. GRB 010214, Optical Observations
  86. GRB 010214 optical observation
  87. GRB010213, Radio Observations
  88. GRB010213 Optical Observation
  89. GRB010213, Radio Observations
  90. J-Band Observation of GRB 010214.
  91. GRB010214, Radio Observations
  92. GRB010214, optical observations
  93. GRB010213, optical observations
  94. GRB010213, Near-IR observations
  95. Possible InfraRed Transient of GRB 010214.
  96. GRB010214 Optical Observation
  97. GRB010214: BeppoSAX/NFI Observations
  98. GRB010213 (HETE) TAROT observations
  99. GRB 010214, optical observations
  100. GRB010213 detected by HETE

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