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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.

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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"

10925 results found.

  1. GRB 050215B: UKIRT K-band imaging
  2. GRB 050215b: Swift XRT Observations
  3. GRB050215b: No Swift UVOT Detection of Afterglow Emission
  4. GRB050215a: No Swift UVOT Detection of Afterglow Emission
  5. Swift-BAT detects two bursts: GRB050215a and GRB050215b
  6. GRB 050209(=U11568): Duration and spectrum
  7. GRB 050209 I-band observation
  8. GRB050209 (=U11568): A Long GRB Detected by HETE
  9. Further analysis of the short Swift-BAT GRB 050202
  10. GRB 050202: Short burst detected by Swift-BAT
  11. GRB 050128 Optical observation with REM
  12. SGR1806-20: Swift-BAT detection of a large normal burst
  13. GRB050128: Faulkes Telescope South observations
  14. GRB050126: Updated Swift XRT Position
  15. GRB050128 Swift-BAT observations
  16. GRB 050128: Swift XRT prompt afterglow position
  17. GRB050126: Burst Parameters Measured by BAT
  18. GRB 050126: Prompt XRT detection and localization
  19. GRB050124: No Swift UVOT Detection of Afterglow Emission
  20. GRB 050124 I-band observation
  21. GRB050124: Updated Swift XRT Position and Fluxes
  22. GRB 050124: Swift XRT Detection of X-ray Afterglow Emission
  23. GRB050124: Refined BAT position, spectral and fluence information
  24. GRB050124: Swift-BAT position of a double-peaked burst
  25. GRB 050123 : I-band follow-up observation
  26. GRB 050123(=H3666): A GRB Localized in Real Time by HETE
  27. GRB050117a: Refined analysis
  28. GRB050117b: Swift-BAT detection of a weak burst
  29. GRB050117: Refined XRT position
  30. GRB050117: Swift-BAT detection of a long multi-peaked burst
  31. GRB050117: Swift XRT Position
  32. SGR 1806-20: RXTE/PCA pulse frequency during flare
  33. SGR1806-20: Swift-BAT observations of two additional bursts
  34. SGR1806: Detection of a Sudden Ionospheric Disturbance
  35. SGR1806-20: Swift-BAT observation of the 041227 super-flare
  36. GRB041228: Swift-BAT detection of a burst
  37. GRB041226: Swift-BAT detection of a burst
  38. GRB 041223: XRT afterglow spectrum and light curve
  39. GRB 041223 Fluence measured by Swift-BAT
  40. GRB041224: Swift-BAT detection of a soft burst
  41. GRB041223: optical and NIR observations with REM
  42. Swift-BAT Time History of GRB041219
  43. GRB041223: Swift XRT Detection of X-ray Afterglow Emission
  44. GRB041223: Swift-BAT detection of a bright long burst
  45. GRB041220: Swift-BAT burst
  46. GRB041219c: Third Burst in One Day from Swift-BAT
  47. GRB041219b: A Swift-BAT burst
  48. Swift-BAT detection of the bright long burst GRB041219
  49. GRB 041218: Optical observations
  50. GRB041217: The First GRB Located On-Board Swift
  51. GRB 041211(=H3622): A Long GRB Localized by the HETE WXM and SXC
  52. GRB970815: Discovery of Optical Afterglow
  53. GRB041006: RTT150 Optical Observations
  54. GRB041006: RTT150 Optical Observations
  55. GRB 041016: Optical limits in V, R, I
  56. GRB041006: Fading X-ray Afterglow Observed with Chandra
  57. GRB041006, optical observation in CrAO
  58. GRB041006: Liverpool Telescope optical observations
  59. GRB 041006: Colour measurement
  60. GRB041006: break in the light curve
  61. GRB041006 (= H3570): Chandra Observations In Progress
  62. GRB 041006: Optical decay
  63. GRB 041006 (=H3570): An X-Ray Rich GRB Localized in Real Time by HETE
  64. GRB 041006: Finding chart
  65. GRB 041006: Optical afterglow candidate
  66. GRB040924, RTT150 optical observation
  67. GRB 040924: detection of possible host galaxy by Subaru
  68. GRB040924, RTT150 optical observation
  69. GRB 040924: NIR finding chart
  70. GRB 040924: RTT150 optical observations
  71. IPN triangulation of GRB040924 (H3564)
  72. GRB 040924(=H3564): A Short, Bright GRB Localized in Real Time by HETE
  73. GRB040912(=H3557): Chandra Candidate X-ray Afterglow
  74. XRF040916: continuing decay of OT
  75. GRB040912(=H3557): Candidate Optical Afterglow
  76. XRF040916: Optical Transient Candidate by Subaru
  77. XRF 040912 (=H3557): Spectral and Temporal Properties
  78. GRB040912(=H3557): Observations with the Chandra X-ray Observatory
  79. GRB040916: Optical observations
  80. GRB040916 (= H3558): Improved Localization from HETE WXM
  81. GRB040916 (= H3558): A Long XRF Localized by HETE
  82. GRB040912 (= H3557): Chandra Observations Scheduled
  83. Optical observations of field of GRB040912
  84. GRB040912 (= H3557): A Long GRB or XRF Localized by HETE
  85. GRB 040903 - INTEGRAL data analysis
  86. Very bright burst detected from SGR 1806-20
  87. Possible GRB 040903 detected with INTEGRAL
  88. GRB 040827: UKIRT - 2nd epoch K-band imaging
  89. GRB 040827: K imaging - no evidence of variability
  90. GRB 040827: RTT150 optical observations
  91. GRB040825B (=H3510): An XRF Localized in Real Time by HETE
  92. GRB 040812: Second epoch CXO Observations
  93. CXO observation of GRB 040812
  94. Bursting activity from SGR 1806-20 detected with IBAS
  95. IPN/HETE localizations of GRB040810 (=H3489)
  96. GRB 040812: a long GRB detected by INTEGRAL
  97. XRF040701: Optical Observations at ESO
  98. IPN/HETE triangulation of GRB040802 (=H3485)
  99. GRB 040730: a long GRB detected with INTEGRAL
  100. GRB040624: optical monitoring at TNG

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