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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"

32531 results found.

  1. GRB 070917: MITSuME Akeno Ic upper limit
  2. GRB 070917: R band observations
  3. GRB 070917, Swift-BAT refined analysis
  4. GRB 070911: Suzaku WAM observation of the prompt emission
  5. GRB 070913: Swift-XRT detection of the possible X-ray afterglow
  6. GRB 070809: The Swift evidence for the SHB nature of this burst
  7. GRB 070913: Swift-BAT refined analysis
  8. GRB 070913: Corrected BAT position
  9. GRB 070913: SMARTS optical/IR observations
  10. GRB 070911: PAIRITEL IR Observations
  11. GRB 070911: Swift XRT refined analysis
  12. GRB 070911, Swift-BAT refined analysis
  13. IPN search for a GRB associated with TAROT transient on August 31
  14. Intense burst from SGR 1806-20 detected on September 7
  15. GRB 070809: Confirmation of optical transient
  16. Observations of possible TAROT GRB transient near IC 4779
  17. GRB 070810b: Image Subtraction of Multiple Keck Observations
  18. Las Campanas observations of possible TAROT GRB transient near IC
  19. Konus-Wind observation of GRB 070824
  20. Konus-Wind observation of very bright GRB 070821
  21. GRB 070731: Swift/UVOT Upper Limit
  22. GRB 070805: UVOT afterglow candidate retraction
  23. GRB070810b: optical candidate
  24. GRB 070810A: ROTSE-III Refined Analysis
  25. GRB 061110A: redshift confirmed
  26. GRB 070810B : Faulkes Telescope South Observations
  27. GRB 070810A: Continued Keck Imaging
  28. GRB 070810B: Keck spectroscopy of possible host galaxies
  29. GRB070810B: Swift/UVOT Upper Limits
  30. GRB 070810B: XRT refined analysis
  31. GRB 070810B, Swift-BAT refined analysis
  32. GRB 070809: Swift/UVOT Corrected Photometry
  33. Swift Trigger 287421: False trigger due to star tracker loss
  34. GRB 070810A: Swift-BAT refined analysis
  35. GRB 070810B: Xinglong TNT optical Upper Limit
  36. GRB070810B: Optical observations with KANATA
  37. GRB 070809: Swift/UVOT Upper Limits
  38. VLA upper limit on the short hard burst GRB 070729
  39. GRB 070810: Keck redshift and photometry
  40. No radio detection in superAGILE burst 070724B
  41. GRB 070809: Keck Imaging
  42. GRB 070810: Swift-XRT Team Refined Analysis
  43. GRB 070809: Swift-XRT refined analysis
  44. GRB 070810: Swift/UVOT Optical Counterpart
  45. GRB 070809, Swift-BAT refined analysis
  46. GRB 070809: Optical Pre-imaging from Palomar
  47. GRB 070808: Swift/UVOT upper limits
  48. GRB 070809: ROTSE-III Optical Limits
  49. GRB 070808 : Faulkes Telescope South Observations
  50. GCN Swift XRT update position notices and enhanced position circulars
  51. GRB 070808: Swift XRT refined analysis
  52. GRB 070808, Swift-BAT refined analysis
  53. GRB 070808: OPTIMA-Burst optical upper limit
  54. GRB 070808: Xinglong TNT optical Upper Limit
  55. GRB070808: Optical observations with KANATA
  56. GRB 070808: ROTSE-III Optical Limits
  57. GRB061121A: PROMPT Observations
  58. GRB070805 XRT and UVOT afterglow candidate
  59. GRB070612A: Radio upper limit from GMRT
  60. GRB 070721B: correct afterglow position
  61. Swift/UVOT observations of GRB070805
  62. GRB 070805, Swift-BAT refined analysis
  63. GRB 070805: Swift XRT initial analysis.
  64. UVOT observations of SAXJ1810.8-2609
  65. VLA non-detection of GRB 070721B
  66. GRB 070802: REM optical observations
  67. GRB 070724B: Swift-XRT afterglow confirmation
  68. GRB 070802: Swift-XRT refined analysis
  69. GRB070802: Swift/UVOT upper limits
  70. GRB 070802: Confirmation of the optical afterglow
  71. GRB 070802, Swift-BAT refined analysis
  72. GRB 070802: VLT redshift
  73. GRB 070802: refined Swift XRT position
  74. GRB 070802: V-band detection of the candidate afterglow
  75. GRB 070802: LCO I-band candidate
  76. GRB 070802: GROND J band candidate
  77. GRB 070802: LCO optical observations
  78. GRB 070802: Swift detection of a burst
  79. Konus-A observation of GRB 070729
  80. Swift/UVOT detection of GRB070714B
  81. AGILE-ACS position for the SGR 1806-20 July 27 burst
  82. GRB 070729: LCO optical imaging
  83. VLA upper limit on short hard burst GRB 070714B
  84. Intense burst from SGR 1806-20 detected on July 27
  85. GRB070729: Swift/UVOT upper limits
  86. GRB 070729: Swift-XRT refined analysis
  87. GRB 070729, Swift-BAT refined analysis
  88. GRB 070729: Magellan NIR Observations
  89. GRB 070724B: P60 Observations
  90. GRB 070724B: Swift/UVOT Upper limits
  91. GRB070721A: Swift/UVOT Detection of a Weak Afterglow
  92. GRB 070724B: Swift-XRT afterglow likely candidate
  93. GRB 070721A: optical observations
  94. GRB 070724A: further VLT observations
  95. GRB 070724B: Suzaku WAM observation of the prompt emission
  96. Konus-Wind observation of GRB 070724B
  97. GRB 070724B: Analysis of AGILE gamma-ray data
  98. GRB 070724B: Swift-XRT afterglow candidates
  99. Four radio sources in Swift-XRT error box of GRB 070724
  100. GRB 070724: optical observations

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