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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"

32494 results found.

  1. VLA upper limit on the short hard burst GRB 070729
  2. GRB 070810: Keck redshift and photometry
  3. No radio detection in superAGILE burst 070724B
  4. GRB 070809: Keck Imaging
  5. GRB 070810: Swift-XRT Team Refined Analysis
  6. GRB 070809: Swift-XRT refined analysis
  7. GRB 070810: Swift/UVOT Optical Counterpart
  8. GRB 070809, Swift-BAT refined analysis
  9. GRB 070809: Optical Pre-imaging from Palomar
  10. GRB 070808: Swift/UVOT upper limits
  11. GRB 070809: ROTSE-III Optical Limits
  12. GRB 070808 : Faulkes Telescope South Observations
  13. GCN Swift XRT update position notices and enhanced position circulars
  14. GRB 070808: Swift XRT refined analysis
  15. GRB 070808, Swift-BAT refined analysis
  16. GRB 070808: OPTIMA-Burst optical upper limit
  17. GRB 070808: Xinglong TNT optical Upper Limit
  18. GRB070808: Optical observations with KANATA
  19. GRB 070808: ROTSE-III Optical Limits
  20. GRB061121A: PROMPT Observations
  21. GRB070805 XRT and UVOT afterglow candidate
  22. GRB070612A: Radio upper limit from GMRT
  23. GRB 070721B: correct afterglow position
  24. Swift/UVOT observations of GRB070805
  25. GRB 070805, Swift-BAT refined analysis
  26. GRB 070805: Swift XRT initial analysis.
  27. UVOT observations of SAXJ1810.8-2609
  28. VLA non-detection of GRB 070721B
  29. GRB 070802: REM optical observations
  30. GRB 070724B: Swift-XRT afterglow confirmation
  31. GRB 070802: Swift-XRT refined analysis
  32. GRB070802: Swift/UVOT upper limits
  33. GRB 070802: Confirmation of the optical afterglow
  34. GRB 070802, Swift-BAT refined analysis
  35. GRB 070802: VLT redshift
  36. GRB 070802: refined Swift XRT position
  37. GRB 070802: V-band detection of the candidate afterglow
  38. GRB 070802: LCO I-band candidate
  39. GRB 070802: GROND J band candidate
  40. GRB 070802: LCO optical observations
  41. GRB 070802: Swift detection of a burst
  42. Konus-A observation of GRB 070729
  43. Swift/UVOT detection of GRB070714B
  44. AGILE-ACS position for the SGR 1806-20 July 27 burst
  45. GRB 070729: LCO optical imaging
  46. VLA upper limit on short hard burst GRB 070714B
  47. Intense burst from SGR 1806-20 detected on July 27
  48. GRB070729: Swift/UVOT upper limits
  49. GRB 070729: Swift-XRT refined analysis
  50. GRB 070729, Swift-BAT refined analysis
  51. GRB 070729: Magellan NIR Observations
  52. GRB 070724B: P60 Observations
  53. GRB 070724B: Swift/UVOT Upper limits
  54. GRB070721A: Swift/UVOT Detection of a Weak Afterglow
  55. GRB 070724B: Swift-XRT afterglow likely candidate
  56. GRB 070721A: optical observations
  57. GRB 070724A: further VLT observations
  58. GRB 070724B: Suzaku WAM observation of the prompt emission
  59. Konus-Wind observation of GRB 070724B
  60. GRB 070724B: Analysis of AGILE gamma-ray data
  61. GRB 070724B: Swift-XRT afterglow candidates
  62. Four radio sources in Swift-XRT error box of GRB 070724
  63. GRB 070724: optical observations
  64. GRB070724: Host galaxy redshift
  65. GRB 070724: P60 and Gemini Observations
  66. GRB 060814 - Keck host detection and redshift
  67. GRB 070724: Closer association with DSS source
  68. Swift/UVOT refined analysis of GRB070724
  69. GRB 070724: Swift-XRT Team refined analysis
  70. GRB 070724: Pre-Imaging Shows a Source in the XRT Error Circle
  71. Short-Hard GRB070714B: PROMPT Observations
  72. GRB 070724, Swift-BAT refined analysis of a short burst
  73. GRB 070721B: further observations and analysis
  74. GRB 070714B: Keck observations
  75. GRB 070721B: optical observations and proposed redshift
  76. Swift/UVOT observations of GRB070721B optical afterglow.
  77. GRB 070721B, Further Swift-BAT refined analysis
  78. Swift/UVOT Observations of GRB070721A
  79. GRB 070721B : Faulkes Telescope South observations
  80. GRB 070721B: Swift-XRT refined analysis
  81. GRB 070721A : Faulkes Telescope South optical limit
  82. GRB 070721A: Swift/XRT refined analysis
  83. GRB 070721B, Swift-BAT refined analysis
  84. GRB 070721A, Swift-BAT refined analysis
  85. GRB070721B: A bright UVOT candidate
  86. GRB 070721B: Swift detection of a burst
  87. GRB 070721: Swift detection of a possible burst
  88. GRB 070714B: Swift/BAT and Suzaku/WAM joint spectral analysis
  89. GRB 070714B : Suzaku WAM observation of the prompt emission
  90. GRB070714B: TNG NIR observations
  91. Erratum : Suzaku WAM observation of GRB 070704
  92. GRB 070714A: Swift/UVOT Upper limits
  93. GRB 070714B: Swift/UVOT Upper Limits
  94. GRB 070616: No Evidence for I Band Afterglow
  95. GRB 070714A: Swift XRT refined analysis
  96. GRB070714B: Swift-XRT refined analysis
  97. GRB 070707: Swift-XRT follow-up observations
  98. GRB 070714b ("Bastille"): Optical Pre-Imaging (Clarification)
  99. GRB 070714 ("Bastille"): Optical Pre-Imaging
  100. GRB 070714B, Swift-BAT refined analysis of the short hard burst

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