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GCN Circulars

GCN Circulars are rapid bulletins submitted by and distributed to the community. 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.

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subject:"Swift"
body:"GRB"
submitter:"Judith Racusin"

19258 results found.

  1. Ongoing activity of SGR 1806-20 after the giant flare
  2. PROMPT VRcIc Observations of GRB 050223
  3. XRF/GRB 050215B: Radio Observations
  4. GRB 050219b: candidate NIR afterglow
  5. Confirmed XRF nature for GRB050215b
  6. INTEGRAL detection of GRB 050223
  7. GRB 050223 Swift/BAT detection of a burst
  8. HETE-2 Observations of GRB 050215b (=U11570): A Likely X-Ray Flash
  9. GRB 050219b: Swift-BAT detection of a burst
  10. GRB 050219b: CORRECTION: Swift XRT Position
  11. GRB 050219b: Swift XRT Position
  12. GRB 050219: Swift-BAT detection of a burst
  13. GRB050215b: P60 Optical Observations
  14. GRB 050215B: candidate afterglow
  15. GRB 050215b : Lulin follow-up observation
  16. GRB 050215b, BOOTES-2 simultaneous optical observations
  17. GRB 050209(=U11568): Duration and spectrum
  18. GRB050209 (=U11568): A Long GRB Detected by HETE
  19. GRB 050128: Radio observations
  20. Further analysis of the short Swift-BAT GRB 050202
  21. GRB 050128 Optical observation with REM
  22. SGR1806-20: Swift-BAT detection of a large normal burst
  23. GRB 050128: near-infrared observations with REM
  24. GRB050128 Swift-BAT observations
  25. GRB 050128: Swift XRT prompt afterglow position
  26. GRB050126: MASTER optical limit for KECK OT
  27. GRB050126: Burst Parameters Measured by BAT
  28. GRB050126: MASTER optical observations
  29. GRB 050124 : Lulin R-band follow-up observation
  30. GRB050124: Updated Swift XRT Position and Fluxes
  31. GRB 050124: Swift XRT Detection of X-ray Afterglow Emission
  32. GRB050124: Refined BAT position, spectral and fluence information
  33. GRB 050123 : I-band follow-up observation
  34. GRB 050123(=H3666): A GRB Localized in Real Time by HETE
  35. GRB050117: Refined XRT position
  36. Triangulation of Short Hard GRB050112 (large error box)
  37. SGR 1806-20: Further low frequency GMRT results
  38. SGR 1806-20: Further VLA Observations
  39. SGR1806: Optical Transient Candidates in SOHO/LASCO Images
  40. Further VLA observations of SGR 1806-20
  41. SGR 1806-20 and extragalactic short-duration GRBs
  42. Further ATCA observations of SGR 1806-20
  43. Fourth Epoch VLA observations of SGR 1806-20
  44. SGR 1806-20: Low frequency GMRT results; submission to GCN circulars
  45. ATCA observations of SGR 1806-20
  46. SGR 1806-20, RHESSI observations of the 041227 giant flare
  47. Third epoch observations of SGR 1806-20 with VLA
  48. Second Epoch VLA observations of SGR 1806-20
  49. Second-epoch VLA observations of SGR 1806-20
  50. SGR1806 VLA Observations
  51. SGR1806-20: RXTE-PCA observation of the 041227 super-flare
  52. Detection of the SGR 1806-20 giant outburst back-scattered by the
  53. GRB041228: Swift-BAT detection of a burst
  54. GRB041219; RXTE ASM Observations
  55. NIR Observations of GRB 041219
  56. GRB041226: Swift-BAT detection of a burst
  57. GRB 041224: near-infrared observations with REM
  58. GRB 041223 Fluence measured by Swift-BAT
  59. GRB041224: Swift-BAT detection of a soft burst
  60. Swift-BAT Time History of GRB041219
  61. GRB 041223: Detection of Optical Transient with LCO40
  62. GRB041223: Swift-BAT detection of a bright long burst
  63. GRB 041218: optical observations
  64. Very high activity of SGR 1806-20
  65. GRB 041219 : optical follow-up observations
  66. Deep RAPTOR observations during GRB 041219
  67. GRB041219c: Third Burst in One Day from Swift-BAT
  68. Swift-BAT detection of the bright long burst GRB041219
  69. GRB 041219 - A long GRB detected by INTEGRAL
  70. GRB041217: optical limit 30 min after GRB
  71. GRB 041217: LCO40 Optical Observations and Possible Candidates
  72. GRB 041218 - A long GRB detected by integral
  73. GRB041217: The First GRB Located On-Board Swift
  74. Optical Transient in Lynx not a GRB
  75. GRB 041211: Optical follow-up in East Asian region
  76. Triangulation of short GRB 041116 (large error box)
  77. GRB 040924: Afterglow Color
  78. Summary of the recent bursts from SGR 1806-20
  79. GRB 041006: Optical Observations
  80. HST Observations: XRF 040701 and 040812
  81. Bright bursts from SGR1806-20
  82. GRB 041015: Optical Observations at Rikubetsu
  83. GRB041006: Fading X-ray Afterglow Observed with Chandra
  84. GRB 041015 - A long GRB detected by INTEGRAL
  85. GRB 041006 R observations in Loiano
  86. GRB041006: VLT observations of the afterglow and host galaxy
  87. GRB 040924: VLT spectroscopy
  88. GRB041006, optical observation in CrAO
  89. Search for SN light in XRF 040912 with MEGACAM
  90. GRB 041006: BR observations with VATT
  91. GRB 041006: Redshift confirmed
  92. GRB 041006: Radio Observations
  93. GRB 041006 : optical follow-up observation at Lulin Observatory
  94. GRB041006: Optical photometry and spectroscopy at TNG
  95. GRB 041006: presice astrometry
  96. GRB041006 (= H3570): Chandra Observations In Progress
  97. GRB041006, optical I observation
  98. GRB041006 (=HETE3570): optical observations
  99. Konus-Wind observation of a series SGR 1806-20 bursts on 041005
  100. Bursts from SGR 1806-20: Preliminary INTEGRAL results

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