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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').

18011 results found.

  1. Swift/UVOT observations of GRB070721B optical afterglow.
  2. GRB 070721B, Further Swift-BAT refined analysis
  3. Swift/UVOT Observations of GRB070721A
  4. GRB 070721B: Swift-XRT refined analysis
  5. GRB 070721A: Swift/XRT refined analysis
  6. GRB 070721B, Swift-BAT refined analysis
  7. GRB 070721A, Swift-BAT refined analysis
  8. GRB070721B: A bright UVOT candidate
  9. GRB 070721B: Swift detection of a burst
  10. GRB 070721: Swift detection of a possible burst
  11. GRB 070714B: Swift/BAT and Suzaku/WAM joint spectral analysis
  12. GRB 070714B : Suzaku WAM observation of the prompt emission
  13. GRB 070714A: Swift-BAT T_zero
  14. GRB 070714A: Swift/UVOT Upper limits
  15. GRB 070714B: Swift/UVOT Upper Limits
  16. GRB 070714B: Swift-BAT spectral lag for the SHB
  17. GRB 070714A: Swift XRT refined analysis
  18. GRB070714B: Swift-XRT refined analysis
  19. GRB 070707: Swift-XRT follow-up observations
  20. GRB 070714B, Swift-BAT refined analysis of the short hard burst
  21. GRB 070714A, Swift-BAT refined analysis
  22. GRB 070714: Swift detection of a bright burst, possibly short
  23. Swift detection of a possible burst (Trigger 284850)
  24. GRB 070704: Suzaku/WAM observation of the prompt emission
  25. Updated Swift/UVOT calibration
  26. GRB 070707: object inside XRT error circle
  27. Swift/UVOT Observations of GRB070707
  28. Swift XRT observation of GRB 070707
  29. GRB070704: FAVOR optical observations
  30. GRB 070704: Swift-XRT refined analysis
  31. Swift/UVOT Observations of GRB070704
  32. GRB 070704, Swift-BAT refined analysis
  33. GRB 070704: Correction to GCN Circ 6594
  34. GRB 070704: Swift detection of a burst
  35. GRB 070628 Swift-UVOT Refined Analysis
  36. GRB 070628: NIR detection of afterglow
  37. GRB 070628, Swift-BAT refined analysis
  38. GRB 070628: TAROT La Silla observatory optical observations
  39. GRB 070628: Swift XRT refined analysis
  40. GRB 070628: Watcher Observations
  41. Swift UVOT Observations of GRB 070628
  42. GRB 070628: Swift detection of a possible burst
  43. INTEGRAL burst GRB070615: X-ray continued observations
  44. GRB 070616 : WIDGET simultaneous optical observations
  45. GRB 070616: Suzaku/WAM observation of the prompt emission
  46. GRB 070621: Swift/UVOT Upper Limits
  47. GRB 070621: Swift-BAT refined analysis
  48. GRB070621: Swift XRT refined analysis
  49. GRB 070621: UVOT-enhanced XRT position
  50. GRB070621: OPTIMA-Burst optical upper limit
  51. GRB 070621: TAROT Calern observatory optical observations
  52. GRB 070621: Watcher Observations
  53. GRB 070621: ROTSE-III Prompt Optical Limits
  54. GRB 070621: Swift detection of a burst
  55. GMRT upper limit of GRB 070610/SWIFT J195509.6+261406 in 610 MHz
  56. Swift/UVOT detection of GRB070616 optical afterglow.
  57. GRB 070616, Swift-BAT further refined analysis
  58. GRB 070616: Swift XRT refined circular
  59. GRB 070616: BTA optical observations
  60. Swift/UVOT observations of GRB070616
  61. GRB 070616: TLS observation
  62. Swift XRT observations of the INTEGRAL burst GRB070615: Possible
  63. GRB 070616, Swift-BAT partial refined analysis
  64. GRB 070616: Swift detection of a burst
  65. UVOT Observations of INTEGRAL burst GRB070615
  66. SWIFT J195509.6+261406 (GRB 070610): further observations
  67. GRB 070612A: Rapid Decay
  68. GRB 070612A: Suzaku/WAM observation of the prompt emission
  69. SWIFT J195509.6+261406 / GRB 070610: OPTIMA-Burst observations
  70. GRB 070611: Watcher Observations
  71. Swift Trigger 282176 is Cygnus X-1
  72. GRB 070612A: MDM Observations
  73. GRB 070612B, Swift-BAT refined analysis
  74. GRB 070612A, Swift-BAT refined analysis
  75. GRB 070612B: Swift-XRT refined analysis
  76. SWIFT J195509.6+261406 / GRB 070610: SWIFT continued observations
  77. GRB 070612B: Swift/UVOT upper limits
  78. GRB 070612B: FRAM limit
  79. GRB 070612B: KAIT limits
  80. GRB 070612B: Swift XRT position from downlink data
  81. GRB 070610: TAROT Calern observatory optical observations
  82. GRB 070612B: Swift detection of a burst
  83. GRB 070612: Swift detection of a burst
  84. GRB 070610: Swift-XRT refined analysis
  85. GRB 070610: TLS RRM sees flaring behaviour - Galactic transient?
  86. GRB 070611: Swift/UVOT Observations
  87. GRB 070611: Swift-XRT refined analysis
  88. GRB 070611, Swift-BAT refined analysis
  89. GRB 070610: Watcher Observations
  90. GRB 070611: ROTSE-III Detection of Late Rising Optical Counterpart
  91. GRB 070611; Swift-XRT position
  92. GRB 070611: ROTSE-III Optical Limits
  93. GRB 070611: Swift detection of a burst
  94. GRB 070610: Swift-UVOT Upper Limits
  95. GRB 070610: OPTIMA-Burst high-time-resolution optical observations
  96. GRB 070610, Swift-BAT refined analysis
  97. GRB 070610; Swift-XRT position
  98. GRB 070610: Swift detection of a burst
  99. GRB 070412: TAROT Calern observatory optical observations
  100. GRB 070411: TAROT Calern observatory optical observations

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