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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').
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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"

12312 results found.

  1. GRB 071118: P60 Observations
  2. GRB 071117: VLT observations and probable redshift
  3. Swift/UVOT observations of GRB071118
  4. Swift XRT follow-up observations of GRB071008
  5. Swift/UVOT upper limits for GRB 071117
  6. GRB 071118: Swift detection of a burst
  7. VLT FORS2 observations of short hard GRB071112B
  8. GRB 071117: Initial Swift/UVOT observations
  9. Swift detection of MXB 0656-072
  10. VLA radio upper limit on GRB 071112C
  11. GRB 071112C: Optical and NIR data observed with KANATA
  12. GRB 071112C: SARA upper limit
  13. GRB 071112C: Swift/UVOT observations
  14. Swift UVOT upper limits of GRB071112B
  15. GRB 071112B: Swift-XRT preliminary analysis
  16. Swift XRT follow-up observations of GRB071028B
  17. GRB071109: Super-LOTIS observations
  18. Swift/UVOT initial analysis of GRB071109
  19. GRB 071109: further Swift-XRT analysis
  20. GRB 071104: Swift-XRT Team Refined Analysis
  21. Swift XRT and UVOT observations of GRB071028B
  22. GRB071101: Optical and NIR upper limits by KANATA
  23. GRB071101 LOAO B,V,R,I observation
  24. GRB 071101: Swift detection of a burst
  25. GRB 071031: Swift/UVOT detection of afterglow
  26. GRB 071020: MITSuME Akeno optical observations
  27. GRB 071031: REM NIR and Optical observation
  28. GRB071025: Optical+NIR observations
  29. Swift UVOT upper limits to GRB071028
  30. GRB071028: Xinglong EST V-band upper limit
  31. GRB071021: MARGE Optical Limits
  32. GRB071020, optical upper limit
  33. GRB 071025: SARA VRI upper limits
  34. GRB 071025 Milagro GeV/TeV Observations
  35. Swift UVOT upper limits
  36. GRB071025: Xinglong TNT I-band upper limit
  37. GRB 060602A: host redshift
  38. GRB 071025: Early Super-LOTIS Observations
  39. GRB 071025: ROTSE-III Refined Analysis
  40. GRB 071025: Swift detection of a burst
  41. GRB071021: Optical+NIR observations
  42. GRB 071021: (Relatively shallow) IR non-detections; motivation for optical spectroscopy
  43. GRB071021: MITSuME Okayama Optical Upper Limits
  44. GRB 071021: Xinglong TNT optical Upper Limit
  45. Konus-Wind observation of GRB 071020
  46. GRB 071017 - Swift XRT observations
  47. GRB 071013: TLS Upper Limit
  48. GRB 20071013: Xinglong TNT optical Upper Limit
  49. GRB 071011: Optical Limit after 13.95hrs
  50. GRB 071011: Kanazawa Optical limits
  51. GRB 071010B: Super-LOTIS upper limit
  52. GRB 071010B: Keck/LRIS Spectroscopy
  53. GRB 071010: Keck/LRIS Spectroscopy
  54. GRB070920A: MAGIC telescope GeV observation
  55. GRB 070810B: further XRT analysis
  56. GRB 071003: Keck HIRES spectroscopy
  57. VLA observation of GRB 070923
  58. GRB 070917: MITSuME Akeno Ic upper limit
  59. GRB 070917: R band observations
  60. IPN search for a GRB associated with TAROT transient on August 31
  61. GRB 070731: Swift/UVOT Upper Limit
  62. GRB070810B: Swift/UVOT Upper Limits
  63. GRB 070809: Swift/UVOT Corrected Photometry
  64. GRB 070810B: Xinglong TNT optical Upper Limit
  65. GRB 070809: Swift/UVOT Upper Limits
  66. GRB 070810B: Swift detection of a short burst
  67. VLA upper limit on the short hard burst GRB 070729
  68. GRB 070810: Swift detection of a burst
  69. GRB 070808: Swift/UVOT upper limits
  70. GRB 070808: OPTIMA-Burst optical upper limit
  71. GRB 070808: Xinglong TNT optical Upper Limit
  72. GRB 070808: Swift detection of a burst
  73. GRB070612A: Radio upper limit from GMRT
  74. Swift/UVOT observations of GRB070805
  75. GRB 070805: Swift XRT initial analysis.
  76. GRB 070805: Swift/UVOT initial analysis
  77. UVOT observations of SAXJ1810.8-2609
  78. GRB070802: Swift/UVOT upper limits
  79. GRB 070802: Swift detection of a burst
  80. Swift/UVOT detection of GRB070714B
  81. VLA upper limit on short hard burst GRB 070714B
  82. GRB070729: Swift/UVOT upper limits
  83. GRB 070729: Swift-XRT refined analysis
  84. GRB 070729: Swift detection of a short hard burst
  85. GRB 070724B: Swift/UVOT Upper limits
  86. Swift/UVOT refined analysis of GRB070724
  87. GRB 070724: Swift detection of a burst
  88. Swift/UVOT observations of GRB070721B optical afterglow.
  89. Swift/UVOT Observations of GRB070721A
  90. GRB 070721B : Faulkes Telescope South observations
  91. GRB 070721A : Faulkes Telescope South optical limit
  92. GRB070714B: TNG NIR observations
  93. GRB 070714A: Swift/UVOT Upper limits
  94. GRB 070714B: Swift/UVOT Upper Limits
  95. GRB 070707: Swift-XRT follow-up observations
  96. Swift/UVOT Observations of GRB070707
  97. GRB070704: FAVOR optical observations
  98. Swift/UVOT Observations of GRB070704
  99. GRB 070628 Swift-UVOT Refined Analysis
  100. INTEGRAL burst GRB070615: X-ray continued observations

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