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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"

11503 results found.

  1. IPN Summary of SGR1806-20 Activity in 2004
  2. SGR 1806-20: no IR variability of the proposed counterparts
  3. MASTER:HETE Alert 3259 (SRG1806-20) optical observation
  4. SGR 1806-20, potential NIR counterpart
  5. MASTER: HETE Alert 3274 optical observation
  6. Activivty of SGR 1806-20
  7. IPN triangulation of an intense intermediate burst from SGR1806-20
  8. GRB 040511: ROTSE-III Rapid Optical Upper Limits
  9. GRB 040511: Second Epoch Optical Observations
  10. GRB 040511: Optical Observations
  11. GRB040511: Optical Observations
  12. GRB and XRF on April 27, 2004. Detection by Konus-Wind and Helicon (Coronas-F)
  13. IPN triangulation of GRB040425 (=H3183)
  14. GRB 040422: ROTSE-IIIb Prompt Optical Limits
  15. GRB 040422: a long GRB detected with INTEGRAL
  16. GRB 040403, deep optical observations
  17. HETE/IPN localization of GRB040403A (=H3143, a long burst) and GRB040403B(=H3144, a short/hard burst)
  18. GRB 040403: Optical observations
  19. GRB 040403: a long GRB detected with INTEGRAL
  20. Summary of recent bursts from SGR 1806-20 detected by INTEGRAL
  21. GRB 040329: hard burst detected by Konus-Wind and Helicon - Coronas-F
  22. GRB040323: NIR Observations and Variable Object
  23. GRB 040323: a long GRB detected with INTEGRAL
  24. GRB040223: Deep NIR NTT data re-analysis
  25. GRB 031203: spectoscopic evidence for a 1998bw-like SN
  26. MASTER: RXTE GRB040308 optical observation
  27. IBAS results on a burst from SGR1806-20
  28. INTEGRAL detection of activity from SGR1806-20
  29. IPN triangulation of GRB040228 (H3066, H3067)
  30. GRB 040223: further offline analysis
  31. GRB031220: 2nd Chandra observation and X-ray afterglow candidate
  32. GRB040106, likely optical afterglow
  33. GRB031220: observation at Univercity of Miyazaki
  34. GRB 040106 : peak flux
  35. IPN triangulation of an intermediate burst from SGR1806-20
  36. GRB031220(=H2976): TNG R-band Observation of the Chandra X-ray Sources
  37. GRB031220(=H2976): Observation with the Chandra X-ray Observatory
  38. GRB031220: Palomar Observations
  39. GRB 031220: Subaru observation
  40. GRB 031220: Optical observation at Tokyo Tech
  41. GRB031220: ROTSE-IIIb Optical Limits
  42. GRB031220 : Optical Observation of Lulin Observatory
  43. GRB 2974 follow-up observations
  44. GRB 021203: A Normal GRB viewed far off axis?
  45. GRB 031203: Variable Radio Source
  46. GRB 031203: Optical/IR Astrometry
  47. GRB 031203: Deep NIR NTT & VLT observations
  48. GRB 031203: Radio detection
  49. IPN triangulation of GRB031127A and B (quasi-simultaneous; large error boxes)
  50. GRB 031203: further analysis of INTEGRAL data
  51. GRB 031203: A long GRB detected with INTEGRAL
  52. IPN/HETE localization of GRB031109 (=H2917; large error box)
  53. IPN detection of activity from SGR1806-20
  54. IPN triangulation of GRB031107 (two large error boxes)
  55. HETE Prompt GRB Spectral Analyses
  56. XRF031109 (=H2919): A very long XRF localized by HETE
  57. Lulin optical follow-up observations of GRB031026
  58. GRB031026 (=H2882): A Long, Hard Spectrum Burst Localized by HETE
  59. IBAS alert 1180 refers to a burst from SGR 1806-20
  60. Ongoing Bursting Activity from SGR 1806-20 detected with IBAS
  61. SGR1806-20 bursts on 031008. Helicon detection and small error box.
  62. SGR 1806-20 bursts with INTEGRAL and IBAS announcement on Soft Gamma-Ray Repeaters
  63. IPN detection of continued activity from SGR1806-20
  64. A burst from SGR 1806-20 detected with IBAS
  65. IPN triangulation of GRB030922B (large error box)
  66. XRF030823 (=H2818): An X-Ray Flash Localized by the HETE WXM and SXC
  67. IPN triangulation of GRB030921 (large error box)
  68. IPN triangulation of GRB030919 (large error box)
  69. GRB 030913, optical candidate
  70. GRB030913: AAVSO optical observations
  71. GRB030913 (=H2849): TAROT Observations
  72. XRF030824: Optical observations
  73. IPN triangulation of GRB030903 (large error box)
  74. IBAS detection of bursts from SGR 1806-20
  75. Radio Observations of SGR1806-20
  76. IPN triangulation of GRB030831 (annulus)
  77. IPN triangulation of GRB030830 (large error box)
  78. INTEGRAL ToO OBSERVATIONS OF SGR1806-20: CALL FOR CORRELATED OBSERVATIONS
  79. Summary of recent IPN and HETE detections of SGR bursts
  80. Clarification of GCN 2354 on SGR1806-20
  81. IPN detection of continued activity from SGR1806-20
  82. 030813 SGR event (Konus-Wind observation)
  83. SGR 1808-20 (=H2802): A Possible new SGR
  84. IPN triangulation of GRB030806 (large burst; large error box)
  85. IPN/HETE summary of recent bursts from SGR1806-20
  86. GRB030725, optical transient observations
  87. GRB030723: Upper limits from historical observations
  88. GRB030725, possible optical transient
  89. XRF030723, BVRcIc field photometry correction
  90. XRF030723, ROTSE-III Early Observations
  91. Konus-Wind detection of the bursts from SGR1806-20 region
  92. SGR 1806-20, submm observations
  93. H2768, H2770, and H2771: Three Bursts from SGR1806-20
  94. IPN triangulation of GRB030717 (annulus)
  95. RXTE PCA Observations of SGR1806-20 Region
  96. Triangulation of GRB030715 (single large error box)
  97. IPN triangulation of GRB030714 (two large error boxes)
  98. IPN triangulation of GRB030715 (two large error boxes)
  99. IPN detection of renewed activity from SGR1806-20
  100. IPN triangulation of GRB030629 (annulus)

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