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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"

19551 results found.

  1. GRB 070923, Swift-BAT refined analysis
  2. GRB 070920B: TAROT La Silla observatory optical observations
  3. GRB 070920B: NOT optical observations
  4. GRB 070920: TAROT Calern observatory optical observations
  5. GRB 070917: P60 Observations
  6. Swift Status and XRT Calibration Uncertainties
  7. GRB 070917: MITSuME Akeno Ic upper limit
  8. GRB 070917: R band observations
  9. GRB 070913: Swift-XRT detection of the possible X-ray afterglow
  10. GRB 070809: The Swift evidence for the SHB nature of this burst
  11. GRB 070913: SMARTS optical/IR observations
  12. GRB 070913: TAROT La Silla observatory optical observations
  13. GRB 070911: PAIRITEL IR Observations
  14. GRB 070809: Confirmation of optical transient
  15. Candidate Orphan GRB Optical Transient in IC 4779
  16. Las Campanas observations of possible TAROT GRB transient near IC
  17. Orphan GRB candidate in IC 4779 at TAROT La Silla observatory
  18. GRB 070824 - Combined SuperAGILE/IPN Localization
  19. Konus-Wind observation of very bright GRB 070821
  20. GRB 070731: Swift/UVOT Upper Limit
  21. GRB 070805: UVOT afterglow candidate retraction
  22. GRB 070810B : Faulkes Telescope South Observations
  23. GRB 070810A: Continued Keck Imaging
  24. GRB 070810B: Keck spectroscopy of possible host galaxies
  25. GRB070810B: Swift/UVOT Upper Limits
  26. GRB 070810B, Swift-BAT refined analysis
  27. GRB 070810B: Xinglong TNT optical Upper Limit
  28. GRB070810B: Optical observations with KANATA
  29. GRB 070809: Swift/UVOT Upper Limits
  30. GRB 070810B: Swift detection of a short burst
  31. VLA upper limit on the short hard burst GRB 070729
  32. No radio detection in superAGILE burst 070724B
  33. GRB 070809: Keck Imaging
  34. GRB 070810: enhanced Swift-XRT position
  35. GRB 070810: Swift/UVOT Optical Counterpart
  36. GRB 070810: Swift detection of a burst
  37. GRB 070809: Optical Pre-imaging from Palomar
  38. GRB 070808: Swift/UVOT upper limits
  39. GRB 070809: Swift detection of a short burst
  40. GRB 070808 : Faulkes Telescope South Observations
  41. GCN Swift XRT update position notices and enhanced position circulars
  42. GRB 070808: Swift XRT refined analysis
  43. GRB 070808: Xinglong TNT optical Upper Limit
  44. GRB070808: Optical observations with KANATA
  45. GRB070808 - SDSS Pre-Burst Observations
  46. GRB 070808: ROTSE-III Optical Limits
  47. GRB070805 XRT and UVOT afterglow candidate
  48. GRB070612A: Radio upper limit from GMRT
  49. Swift/UVOT observations of GRB070805
  50. GRB 070805: Swift/UVOT initial analysis
  51. UVOT observations of SAXJ1810.8-2609
  52. Swift detection of a outburst from SAX J1810.8-2609
  53. VLA non-detection of GRB 070721B
  54. GRB 070802: REM optical observations
  55. GRB 070802: Swift-XRT refined analysis
  56. GRB070802: Swift/UVOT upper limits
  57. GRB 070802: V-band detection of the candidate afterglow
  58. GRB 070802: GROND J band candidate
  59. GRB 070802: Swift detection of a burst
  60. Swift/UVOT detection of GRB070714B
  61. VLA upper limit on short hard burst GRB 070714B
  62. GRB070729: Swift/UVOT upper limits
  63. GRB 070724B: P60 Observations
  64. GRB 070724B: Swift/UVOT Upper limits
  65. GRB 070721A: optical observations
  66. GRB 070724A: further VLT observations
  67. Four radio sources in Swift-XRT error box of GRB 070724
  68. GRB 070724: P60 and Gemini Observations
  69. GRB 060814 - Keck host detection and redshift
  70. Swift/UVOT refined analysis of GRB070724
  71. GRB 070724: Swift-XRT Team refined analysis
  72. GRB 070721B: further observations and analysis
  73. GRB 070724: Swift detection of a burst
  74. GRB 070714B: Keck observations
  75. Swift/UVOT Observations of GRB070721A
  76. GRB 070721B : Faulkes Telescope South observations
  77. GRB 070721A : Faulkes Telescope South optical limit
  78. GRB 070721A: Swift/XRT refined analysis
  79. GRB 070721A, Swift-BAT refined analysis
  80. GRB070721B: A bright UVOT candidate
  81. GRB070714B: TNG NIR observations
  82. GRB 070714A: Swift/UVOT Upper limits
  83. GRB 070714B: Swift/UVOT Upper Limits
  84. GRB 070714B: confirmation of optical afterglow
  85. GRB 070616: No Evidence for I Band Afterglow
  86. GRB 070714A: Swift XRT refined analysis
  87. GRB070714B: Swift-XRT refined analysis
  88. GRB 070714b ("Bastille"): Optical Pre-Imaging (Clarification)
  89. GRB 070714 ("Bastille"): Optical Pre-Imaging
  90. GRB 070714 : Liverpool Telescope optical counterpart ?
  91. GRB 070714: Swift detection of a bright burst, possibly short
  92. GRB 070704: RTT150 optical observations
  93. GRB 070707: optical afterglow
  94. Swift/UVOT Observations of GRB070707
  95. Swift XRT observation of GRB 070707
  96. GRB 070707: VLT observations
  97. GRB070704: FAVOR optical observations
  98. GRB 070704 : Liverpool Telescope Observations
  99. GRB 070611: VLT observations
  100. VLA detection of GRB 070612A in C Band

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