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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"

18697 results found.

  1. Swift UVOT Monitoring of the SN 2008D Brightening (Transient in NGC 2770)
  2. Swift observations of the X-ray transient in NGC 2770 (aka SN2008D)
  3. XRB 080109/SN 2008D: Early decline in brightness and change in colors
  4. XRB 080109/SN 2008D:PAIRITEL NIR observations and t_0 from Swift
  5. XRF 080109 in NGC2770: Detectable Superluminal Motion
  6. XRF in NGC 2770: Search for X-ray periodicity
  7. Refined Swift-XRT analysis of the transient in NGC 2770
  8. Refined Swift UVOT Analysis of SN 2008D (Transient in NGC 2770)
  9. Swift UVOT Observations of the X-ray transient in NGC 2770
  10. Early OT detection of XRF in NGC 2770 in Asiago frames
  11. Bright X-ray Transient in NGC 2770 - A low-luminosity XRF?
  12. GRB 071227: Suzaku WAM observation of the prompt emission
  13. Further Swift-BAT analysis of GRB 071227
  14. Konus-Wind observation of GRB 071227
  15. GRB 071227: Swift-XRT refined analysis
  16. GRB071227: Swift/UVOT refined analysis
  17. Swift-BAT refined analysis of short GRB 071227
  18. GRB 071227: Swift detection of a burst
  19. GRB 070429B: Possible UVOT Detection of an Optical Afterglow
  20. Swift-BAT trigger 298308 is not a GRB
  21. GRB 071208?: Swift detection of a possible burst
  22. GRB 071129, Swift-BAT refined analysis
  23. GRB 071129: Swift detection of a burst
  24. GRB 071126: Enhanced Swift-XRT position
  25. VLA radio detection of GRB 071122
  26. GRB071122: Swift/UVOT Observations
  27. GRB 071122, Swift-BAT refined analysis
  28. GRB 071122 Swift XRT position update sent in error.
  29. GRB 071122 Swift-XRT refined analysis
  30. GRB 071122: ROTSE-III Optical Limits
  31. GRB 071122: Swift detection of a burst
  32. Swift/UVOT observations of GRB071118
  33. GRB 071117: Swift-XRT revised position
  34. Konus-Wind and Konus-A observations of GRB 071117
  35. Swift XRT follow-up observations of GRB071008
  36. Swift/UVOT upper limits for GRB 071117
  37. GRB071118: Swift XRT refined analysis
  38. GRB 071118, Swift-BAT refined analysis
  39. GRB 071117: TAROT La Silla observatory optical observations
  40. GRB 071118: Swift detection of a burst
  41. GRB 071117: Swift-XRT refined analysis
  42. GRB 071117, Swift-BAT refined analysis
  43. GRB 071117: Swift/XRT position
  44. GRB 071117: Initial Swift/UVOT observations
  45. GRB 071117: Swift detection of a bright burst
  46. Swift detection of MXB 0656-072
  47. VLA radio upper limit on GRB 071112C
  48. ATCA radio observations of short hard burst GRB 071112B
  49. Correction to the Swift-BAT Transient Identification (trigger=296683)
  50. GRB 071112C: Swift-BAT refined analysis
  51. GRB 071112C: Swift/UVOT observations
  52. GRB 071112C: Swift XRT refined analysis
  53. Swift UVOT upper limits of GRB071112B
  54. GRB 071112B: Swift-XRT preliminary analysis
  55. GRB 071112B, Swift-BAT partial refined analysis of the SHB
  56. Swift-BAT trigger 296491 is not a GRB
  57. GRB 071112C: TAROT Calern observatory optical observations
  58. Swift XRT follow-up observations of GRB071028B
  59. GRB 071112C: ROTSE-III Confirmation of Optical Counterpart
  60. GRB 071112B: ROTSE-III Rapid Optical Limits
  61. GRB 071112C: Swift detection of a burst with an optical counterpart
  62. GRB 071112B: Swift detection of a short hard burst
  63. GRB 071112: Swift detection of a possible burst
  64. VLA IInd observation of INTEGRAL burst GRB 071109
  65. Swift/UVOT initial analysis of GRB071109
  66. GRB 071109: further Swift-XRT analysis
  67. No radio detection at Swift-XRT position
  68. GRB 071109: Swift-XRT possible X-ray counterpart
  69. GRB 071104: Swift-XRT Team Refined Analysis
  70. GRB 071104: Possible Swift UVOT Afterglow Candidate
  71. GRB 071104: Swift-XRT position
  72. Swift XRT and UVOT observations of GRB071028B
  73. GRB 071101, Swift-BAT refined analysis
  74. GRB 071101: Swift-XRT Team refined analysis
  75. GRB 071101: TAROT Calern observatory optical observations
  76. GRB 071101: Swift XRT position
  77. GRB 071101: BOOTES-2 prompt optical observations
  78. GRB 071101: a nearby galaxy
  79. GRB 071101: Swift detection of a burst
  80. GRB 071031, Swift-BAT refined analysis
  81. GRB 071031: Swift/UVOT detection of afterglow
  82. GRB 071031: Swift-XRT Team refined analysis
  83. GRB 071031: Swift detection of a burst with an optical counterpart
  84. GRB 071028B Swift-BAT detection of a burst
  85. Swift UVOT upper limits to GRB071028
  86. GRB 071028: Swift-XRT Team refined analysis
  87. GRB 071028, Swift-BAT refined analysis
  88. GRB 071028: Swift detection of a burst
  89. GRB 071025: Kuiper Telescope Optical Observations
  90. GRB 071018: Revised BAT position
  91. GRB 071025A: RAPTOR Observations of Complex Early Optical Behavior
  92. GRB071021: MARGE Optical Limits
  93. GRB071020, optical upper limit
  94. GRB 071025 Milagro GeV/TeV Observations
  95. Swift UVOT upper limits
  96. GRB 071025: Swift-XRT Team refined analysis
  97. GRB 071025, Swift-BAT refined analysis
  98. GRB 071025: Early Super-LOTIS Observations
  99. GRB 071025: ROTSE-III Refined Analysis
  100. GRB 071025: Swift XRT refined position

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