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GCN Circulars

GCN Circulars are rapid bulletins submitted by and distributed to the community. 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.

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subject:"Swift"
body:"GRB"
submitter:"Judith Racusin"

12404 results found.

  1. LIGO/Virgo G284239: Swift/BAT data search
  2. LIGO/Virgo G284239: AGILE GRID observations
  3. LIGO/Virgo G284239: INTEGRAL search for a prompt gamma-ray counterpart
  4. GRB 170428A: 15 GHz upper limits from AMI
  5. Swift Trigger 748858: 15 GHz upper limits from AMI
  6. GRB 170428A: RATIR Afterglow Confirmation
  7. GRB 170428A: Swift/UVOT Upper Limits
  8. GRB 170428A: Xinglong 2.16-m upper limit and host galaxy candidate
  9. GRB 170428A: MASTER-OAFA early optical observations
  10. Swift Trigger 750337 is probably a noise fluctuation
  11. GRB 170428A: Swift detection of a short burst
  12. GRB170426.95 MASTER-Net OT detection
  13. Swift Trigger 750044 is probably a noise fluctuation
  14. Konus-Wind observation of GRB 170424A
  15. GRB 170419A: Swift/UVOT Upper Limits
  16. Swift Trigger 748858: RATIR Optical and NIR Observations
  17. Swift Trigger 748858: MASTER-OAFA early optical observations
  18. GRB 170419A: Swift detection of a burst
  19. Swift Trigger 748858: a possible GRB
  20. GRB170405A, Swift-UVOT Detection
  21. GRB 170405A: Etelman observatory optical observations
  22. Trigger 745966: Swift detection of 4U1850-03
  23. LIGO/Virgo G275404: European VLBI Network (EVN) follow-up of the near-IR transient in the AGL J1914+1043 field
  24. IceCube-170321A: Konus-Wind upper limits
  25. Swift Trigger 745090 is a noise trigger near NGC 5195
  26. Fermi-LAT Gamma-ray Observations of IceCube-170321
  27. Swift triggered on SAX J1806.5-221
  28. GRB 170331A: Swift/UVOT Upper Limits
  29. IceCube-170321A: Swift-XRT observations
  30. GRB 170330A: Swift/UVOT Detection of a Fading Afterglow
  31. GRB 170325A: 15 GHz upper limits from AMI
  32. GRB 170318B: 15 GHz upper limits from AMI
  33. GRB 170318A: 15 GHz upper limits from AMI
  34. GRB 170317A: 15 GHz upper limits from AMI
  35. Konus-Wind observation of GRB 170329A
  36. GRB 170330A: Swift detection of a burst
  37. LIGO/Virgo G277583: Konus-Wind observations
  38. INTEGRAL pointed follow-up of IceCube-170321A
  39. LIGO/Virgo G277583: Fermi GBM Observations
  40. LIGO/Virgo G277583: INTEGRAL search for an X-ray and gamma-ray counterpart
  41. Fermi GBM Observation of IceCube-170321A
  42. LIGO/Virgo G275697: AMI Large Array Search for a Radio Afterglow
  43. INTEGRAL SPI-ACS observation of AMON IceCube EHE 80305071 129307
  44. Search for counterpart to IceCube-170321A with ANTARES
  45. GRB 170318A: KAIT Optical Upper Limit
  46. GRB 170318B: RATIR Optical and NIR Observations
  47. GRB 170317A: RATIR Optical and NIR Observations
  48. GRB 170318B: Swift/UVOT Upper Limits
  49. GRB 170318A: RATIR Optical and NIR Observations
  50. GRB 170318A: Swift/UVOT Upper Limits
  51. GRB 170317A: RATIR Optical and NIR Observations
  52. GRB 170318B: Swift detection of a burst
  53. GRB 170318A: Swift detection of a burst
  54. LIGO/Virgo G277583 : MAXI/GSC observations
  55. GRB 170317A: MITSuME Okayama Optical Observation
  56. LIGO/Virgo G277583: AstroSat CZTI upper limits
  57. GRB 170317A: Swift/UVOT Detection
  58. GRB 170317A: MITSuME Okayama Ks-band upper-limit
  59. IceCube-170312A: Swift-XRT observations
  60. LIGO/Virgo G277583: Swift/BAT data search
  61. GRB 170307A: 15 GHz upper limit from AMI
  62. LIGO/Virgo G275697: Fermi-LAT search for a high-energy gamma-ray counterpart
  63. LIGO/Virgo G277583 ANTARES search
  64. LIGO/Virgo G277583: AGILE GRID observations
  65. LIGO/Virgo G270580: optical observations and classification of PS and MASTER sources
  66. INTEGRAL observation of IceCube HESE 65274589 129281
  67. GRB 170311A: Further GROND analysis
  68. GRB 170311A: Swift/UVOT Upper Limits
  69. GRB 170311A: GROND upper limits
  70. GRB 170311A: MASTER-OAFA early optical observations
  71. GRB 170311A: Swift detection of a burst
  72. LIGO/Virgo G275404: Swift-XRT observations of sources in the AGILE error region
  73. LIGO/Virgo G275697: Swift-XRT source 23 is fading
  74. Swift trigger 741567: MASTER red star flare detection
  75. LIGO/Virgo G275404 and AGL J1914+1043: INTEGRAL follow-up
  76. GRB 170306B: Swift-XRT observations
  77. GRB 170306A: Swift/UVOT Upper Limits
  78. LIGO/Virgo G275697: Further Swift-XRT sources
  79. GRB 170306A: Swift detection of a burst
  80. LIGO/Virgo G275697: Further Swift-XRT sources
  81. LIGO/Virgo G275697: Further Swift-XRT sources
  82. Konus-Wind observation of GRB 170228A
  83. LIGO/Virgo G275697: MAXI/GSC observations
  84. LIGO/Virgo G275697: Further Swift-XRT sources
  85. LIGO/Virgo G275697: Fermi GBM Upper Limits
  86. LIGO/Virgo G275697: AstroSat CZTI upper limits
  87. LIGO/Virgo G268556, G270580, G274296, and G275404: Konus-Wind observations
  88. LIGO/Virgo G275404: Fermi GBM Upper Limits
  89. GRB 170206B: 15 GHz upper limits from AMI
  90. LIGO/Virgo G275697: MASTER automatic follow up detection
  91. LIGO/Virgo G274296 and G275404 : MAXI/GSC observations
  92. LIGO/Virgo G275697: Fermi-LAT search for a high-energy gamma-ray counterpart
  93. LIGO/Virgo G275697: REM optical/NIR observations
  94. LIGO/Virgo G275697: Konus-Wind observations
  95. LIGO/Virgo G275697: Swift-XRT sources
  96. LIGO/Virgo G275697: Swift/BAT data search
  97. LIGO/Virgo G275697: AGILE-GRID preliminary analysis
  98. LIGO/Virgo G275697: INTEGRAL search for a prompt gamma-ray counterpart
  99. LIGO/VIRGO G275697: Fermi GBM Observations
  100. LIGO/Virgo G275404: AstroSat CZTI upper limits

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