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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"

28084 results found.

  1. GRB 070808: OPTIMA-Burst optical upper limit
  2. GRB 070808: Xinglong TNT optical Upper Limit
  3. GRB070808: Optical observations with KANATA
  4. GRB070808 - SDSS Pre-Burst Observations
  5. GRB 070808: ROTSE-III Optical Limits
  6. GRB070805 XRT and UVOT afterglow candidate
  7. GRB070612A: Radio upper limit from GMRT
  8. GRB 070721B: correct afterglow position
  9. Swift/UVOT observations of GRB070805
  10. GRB 070805, Swift-BAT refined analysis
  11. UVOT observations of SAXJ1810.8-2609
  12. Swift detection of a outburst from SAX J1810.8-2609
  13. VLA non-detection of GRB 070721B
  14. GRB 070802: REM optical observations
  15. GRB 070802: Swift-XRT refined analysis
  16. GRB070802: Swift/UVOT upper limits
  17. GRB 070802, Swift-BAT refined analysis
  18. GRB 070802: V-band detection of the candidate afterglow
  19. GRB 070802: GROND J band candidate
  20. GRB 070731, Swift-BAT refined analysis
  21. Konus-A observation of GRB 070729
  22. Swift/UVOT detection of GRB070714B
  23. VLA upper limit on short hard burst GRB 070714B
  24. Intense burst from SGR 1806-20 detected on July 27
  25. GRB070729: Swift/UVOT upper limits
  26. GRB 070729: Swift-XRT refined analysis
  27. GRB 070729, Swift-BAT refined analysis
  28. GRB 070724B: P60 Observations
  29. GRB 070724B: Swift/UVOT Upper limits
  30. GRB 070724B: Swift-XRT afterglow likely candidate
  31. GRB 070721A: optical observations
  32. GRB 070724A: further VLT observations
  33. GRB 070724B: Suzaku WAM observation of the prompt emission
  34. GRB 070724B: Swift-XRT afterglow candidates
  35. Four radio sources in Swift-XRT error box of GRB 070724
  36. GRB 070724: P60 and Gemini Observations
  37. GRB 060814 - Keck host detection and redshift
  38. Swift/UVOT refined analysis of GRB070724
  39. GRB 070724: Swift-XRT Team refined analysis
  40. GRB 070724, Swift-BAT refined analysis of a short burst
  41. GRB 070721B: further observations and analysis
  42. GRB 070724: Swift detection of a burst
  43. GRB 070326: Detection of first burst from BAT Slew Survey (BATSS)
  44. GRB 070714B: Keck observations
  45. GRB 070721B: optical observations and proposed redshift
  46. GRB 070721B, Further Swift-BAT refined analysis
  47. Swift/UVOT Observations of GRB070721A
  48. GRB 070721B : Faulkes Telescope South observations
  49. GRB 070721B: Swift-XRT refined analysis
  50. GRB 070721A : Faulkes Telescope South optical limit
  51. GRB 070721A: Swift/XRT refined analysis
  52. GRB 070721B, Swift-BAT refined analysis
  53. GRB 070721A, Swift-BAT refined analysis
  54. GRB070721B: A bright UVOT candidate
  55. GRB 070714B: Swift/BAT and Suzaku/WAM joint spectral analysis
  56. GRB 070714B : Suzaku WAM observation of the prompt emission
  57. GRB070714B: TNG NIR observations
  58. Erratum : Suzaku WAM observation of GRB 070704
  59. GRB 070714A: Swift/UVOT Upper limits
  60. GRB 070714B: Swift/UVOT Upper Limits
  61. GRB 070714B: confirmation of optical afterglow
  62. GRB 070616: No Evidence for I Band Afterglow
  63. GRB 070714A: Swift XRT refined analysis
  64. GRB070714B: Swift-XRT refined analysis
  65. GRB 070707: Swift-XRT follow-up observations
  66. GRB 070714B, Swift-BAT refined analysis of the short hard burst
  67. GRB 070714A, Swift-BAT refined analysis
  68. GRB 070714 : Liverpool Telescope optical counterpart ?
  69. GRB 070714: Swift detection of a bright burst, possibly short
  70. SN 2007bg - off-axis GRB?
  71. GRB 070704: RTT150 optical observations
  72. GRB 070704: Suzaku/WAM observation of the prompt emission
  73. Konus-Wind observation of GRB 070707
  74. GRB 070707: optical afterglow
  75. Swift/UVOT Observations of GRB070707
  76. Swift XRT observation of GRB 070707
  77. GRB 070707: VLT observations
  78. GRB070704: FAVOR optical observations
  79. GRB 070704 : Liverpool Telescope Observations
  80. GRB 070611: VLT observations
  81. VLA detection of GRB 070612A in C Band
  82. GRB 070704: Swift-XRT refined analysis
  83. Swift/UVOT Observations of GRB070704
  84. GRB 070704, Swift-BAT refined analysis
  85. GRB 070704: Correction to GCN Circ 6594
  86. GRB 070704: Swift detection of a burst
  87. GRB 070626: Suzaku/WAM observation of the prompt emission
  88. GRB 070628 Swift-UVOT Refined Analysis
  89. GRB 070628: NIR detection of afterglow
  90. GRB 070628, Swift-BAT refined analysis
  91. GRB 070628: TAROT La Silla observatory optical observations
  92. Swift UVOT Observations of GRB 070628
  93. OT20050728 was not an optical GRB afterglow
  94. GRB 070616 : WIDGET simultaneous optical observations
  95. GRB 070616: Suzaku/WAM observation of the prompt emission
  96. GRB070621: RTT150 optical observations
  97. GRB 070621: VLT optical observations
  98. GRB 070621: Swift/UVOT Upper Limits
  99. Keck Laser Guide Star Adaptive Optics Imaging of GRB 070621
  100. GRB 070621: Swift-BAT refined analysis

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