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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').

18342 results found.

  1. UVOT observations of SAXJ1810.8-2609
  2. Swift detection of a outburst from SAX J1810.8-2609
  3. VLA non-detection of GRB 070721B
  4. GRB 070802: REM optical observations
  5. GRB 070724B: Swift-XRT afterglow confirmation
  6. GRB 070802: Swift-XRT refined analysis
  7. GRB070802: Swift/UVOT upper limits
  8. GRB 070802, Swift-BAT refined analysis
  9. GRB 070802: refined Swift XRT position
  10. GRB 070802: GROND J band candidate
  11. GRB 070802: Swift detection of a burst
  12. GRB 070731, Swift-BAT refined analysis
  13. Konus-A observation of GRB 070729
  14. Swift/UVOT detection of GRB070714B
  15. VLA upper limit on short hard burst GRB 070714B
  16. GRB070729: Swift/UVOT upper limits
  17. GRB 070729: Swift-XRT refined analysis
  18. GRB 070729, Swift-BAT refined analysis
  19. GRB 070729: Swift detection of a short hard burst
  20. GRB 070724B: Swift/UVOT Upper limits
  21. GRB070721A: Swift/UVOT Detection of a Weak Afterglow
  22. GRB 070724B: Swift-XRT afterglow likely candidate
  23. GRB 070724B: Swift-XRT afterglow candidates
  24. Four radio sources in Swift-XRT error box of GRB 070724
  25. GRB 060814 - Keck host detection and redshift
  26. Swift/UVOT refined analysis of GRB070724
  27. GRB 070724: Swift-XRT Team refined analysis
  28. GRB 070724, Swift-BAT refined analysis of a short burst
  29. GRB 070724: Swift detection of a burst
  30. GRB 070326: Detection of first burst from BAT Slew Survey (BATSS)
  31. GRB 070714B: Keck observations
  32. Swift/UVOT observations of GRB070721B optical afterglow.
  33. GRB 070721B, Further Swift-BAT refined analysis
  34. Swift/UVOT Observations of GRB070721A
  35. GRB 070721B: Swift-XRT refined analysis
  36. GRB 070721A: Swift/XRT refined analysis
  37. GRB 070721B, Swift-BAT refined analysis
  38. GRB 070721A, Swift-BAT refined analysis
  39. GRB070721B: A bright UVOT candidate
  40. GRB 070721B: Swift detection of a burst
  41. GRB 070721: Swift detection of a possible burst
  42. GRB 070714B: Swift/BAT and Suzaku/WAM joint spectral analysis
  43. GRB 070714B : Suzaku WAM observation of the prompt emission
  44. GRB 070714A: Swift-BAT T_zero
  45. GRB 070714A: Swift/UVOT Upper limits
  46. GRB 070714B: Swift/UVOT Upper Limits
  47. GRB 070714B: Swift-BAT spectral lag for the SHB
  48. GRB 070714A: Swift XRT refined analysis
  49. GRB070714B: Swift-XRT refined analysis
  50. GRB 070707: Swift-XRT follow-up observations
  51. GRB 070714B, Swift-BAT refined analysis of the short hard burst
  52. GRB 070714A, Swift-BAT refined analysis
  53. GRB 070714: Swift detection of a bright burst, possibly short
  54. Swift detection of a possible burst (Trigger 284850)
  55. GRB 070704: Suzaku/WAM observation of the prompt emission
  56. Updated Swift/UVOT calibration
  57. GRB 070707: object inside XRT error circle
  58. Swift/UVOT Observations of GRB070707
  59. Swift XRT observation of GRB 070707
  60. GRB070704: FAVOR optical observations
  61. GRB 070704: Swift-XRT refined analysis
  62. Swift/UVOT Observations of GRB070704
  63. GRB 070704, Swift-BAT refined analysis
  64. GRB 070704: Correction to GCN Circ 6594
  65. GRB 070704: Swift detection of a burst
  66. GRB 070628 Swift-UVOT Refined Analysis
  67. GRB 070628: NIR detection of afterglow
  68. GRB 070628, Swift-BAT refined analysis
  69. GRB 070628: TAROT La Silla observatory optical observations
  70. GRB 070628: Swift XRT refined analysis
  71. GRB 070628: Watcher Observations
  72. Swift UVOT Observations of GRB 070628
  73. GRB 070628: Swift detection of a possible burst
  74. INTEGRAL burst GRB070615: X-ray continued observations
  75. GRB 070616 : WIDGET simultaneous optical observations
  76. GRB 070616: Suzaku/WAM observation of the prompt emission
  77. GRB 070621: Swift/UVOT Upper Limits
  78. GRB 070621: Swift-BAT refined analysis
  79. GRB070621: Swift XRT refined analysis
  80. GRB 070621: UVOT-enhanced XRT position
  81. GRB070621: OPTIMA-Burst optical upper limit
  82. GRB 070621: TAROT Calern observatory optical observations
  83. GRB 070621: Watcher Observations
  84. GRB 070621: ROTSE-III Prompt Optical Limits
  85. GRB 070621: Swift detection of a burst
  86. GMRT upper limit of GRB 070610/SWIFT J195509.6+261406 in 610 MHz
  87. Swift/UVOT detection of GRB070616 optical afterglow.
  88. GRB 070616, Swift-BAT further refined analysis
  89. GRB 070616: Swift XRT refined circular
  90. GRB 070616: BTA optical observations
  91. Swift/UVOT observations of GRB070616
  92. GRB 070616: TLS observation
  93. Swift XRT observations of the INTEGRAL burst GRB070615: Possible
  94. GRB 070616, Swift-BAT partial refined analysis
  95. GRB 070616: Swift detection of a burst
  96. UVOT Observations of INTEGRAL burst GRB070615
  97. SWIFT J195509.6+261406 (GRB 070610): further observations
  98. GRB 070612A: Rapid Decay
  99. GRB 070612A: Suzaku/WAM observation of the prompt emission
  100. SWIFT J195509.6+261406 / GRB 070610: OPTIMA-Burst observations

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