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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"

4180 results found.

  1. GRB 040924: Second Epoch WSRT Radio Observations
  2. GRB040929,optical observation
  3. GRB040916: Optical observations
  4. ROTSE-IIIb Observations of GRB 040916 (HETE #3558)
  5. An intense burst from SGR1806-20
  6. Very bright burst detected from SGR 1806-20
  7. GRB 040827 : Planned XMM-Newton observation
  8. GRB 040827 - A long GRB detected by INTEGRAL
  9. Increase of SGR 1806-20 activity
  10. Bursting activity from SGR 1806-20 detected with IBAS
  11. Ongoing activity of SGR 1806-20
  12. XRF040701: Second-Epoch Chandra Observations
  13. XRF040701: First-Epoch Chandra Observations
  14. GRB040709 J,H-band observations
  15. GRB040706:observation at University of Miyazaki
  16. IPN Summary of SGR1806-20 Activity in 2004
  17. SGR 1806-20: no IR variability of the proposed counterparts
  18. SGR 1806-20, potential NIR counterpart
  19. MASTER: HETE Alert 3274 optical observation
  20. Activivty of SGR 1806-20
  21. IBAS GRB Alerts n.1785 to 1791
  22. GRB 040422: a long GRB detected with INTEGRAL
  23. Summary of recent bursts from SGR 1806-20 detected by INTEGRAL
  24. IBAS GRB Alert 1694
  25. short hard GRB 040322
  26. IBAS GRB alerts 1679, 1680, 1681
  27. IBAS results on a burst from SGR1806-20
  28. RXTE GRB040229 optical observation: no candidate
  29. GRB031220: observation at Univercity of Miyazaki
  30. GRB 031220: Optical observation at Tokyo Tech
  31. GRB 031203: Discovery of a dust echo
  32. GRB031203: K' Photometry of the likely GRB host
  33. XRF031109 (=H2919): A very long XRF localized by HETE
  34. IPN triangulation of GRB031026B (large error box)
  35. IBAS alert 1180 refers to a burst from SGR 1806-20
  36. Ongoing Bursting Activity from SGR 1806-20 detected with IBAS
  37. SGR1806-20 bursts on 031008. Helicon detection and small error box.
  38. SGR 1806-20 bursts with INTEGRAL and IBAS announcement on Soft Gamma-Ray Repeaters
  39. XRF 030723: Subaru Optical Observations
  40. A burst from SGR 1806-20 detected with IBAS
  41. IPN triangulation of GRB030926 (short/hard; large error box)
  42. GRB030913: AAVSO optical observations
  43. IBAS detection of bursts from SGR 1806-20
  44. Radio Observations of SGR1806-20
  45. INTEGRAL ToO OBSERVATIONS OF SGR1806-20: CALL FOR CORRELATED OBSERVATIONS
  46. Summary of recent IPN and HETE detections of SGR bursts
  47. Clarification of GCN 2354 on SGR1806-20
  48. IPN detection of continued activity from SGR1806-20
  49. 030813 SGR event (Konus-Wind observation)
  50. SGR 1808-20 (=H2802): A Possible new SGR
  51. IPN triangulation of GRB030721 (large error box)
  52. GRB030723: Upper limits from historical observations
  53. XRF030723, optical observations
  54. SGR 1806-20, submm observations
  55. RXTE PCA Observations of SGR1806-20 Region
  56. IPN triangulation of GRB030715 (two large error boxes)
  57. GRB030329: RTT150 optical observations
  58. GRB030329, optical observation in May
  59. HETE detection of burst from SGR1806-20
  60. IPN triangulation of GRB030606 (two alternate error boxes)
  61. GRB 030528: tentative NIR counterpart
  62. GRB 030329/SN 2003dh: Jitter Episode
  63. GRB030519B (=H2716): A Long, Bright GRB Localized by the HETE WXM
  64. GRB 030329: Optical limit (contemporaneous imaging)
  65. IPN triangulation of GRB030509 (single error box)
  66. GRB030429, refiend optical brightness
  67. GRB 030329: Optical limit (contemporaneous photography)
  68. GRB030429 (=H2695): A Long GRB Localized by the HETE WXM and SXC
  69. GRB 030329 Optical Observations
  70. GRB030328, optical observation
  71. GRB030429: Optical Observations
  72. GRB030329 observed as a sudden ionospheric disturbance (SID)
  73. OT GRB 030329: early UBVRcIc spectral evolution
  74. GRB030329, UBVRI polarimetry, R-polarization
  75. OT GRB 030329: early spectrum
  76. IPN triangulation of GRB030413 (small error box)
  77. GRB030329: Near Infrared Observations at Gunma
  78. GRB030329: Kiso B and R band observations
  79. GRB030328: R upper limit after 6 hours by MASTER
  80. GRB030329: final R-band light curve by MASTER
  81. GRB030329: optical observations at Tokyo Tech
  82. Further AAVSO V,B,R observations of GRB030329
  83. GRB 030329: Additional Mt. Laguna Optical Observations
  84. GRB 030329: Observations with ANDICAM
  85. GRB030329: Optical observations
  86. GRB 030329: Correction to GCN 2056
  87. GRB 030329: optical observations
  88. GRB 030328, optical photometry
  89. GRB030329: R band light curve by MASTER
  90. GRB030329 - near contemporaneous optical limits from CONCAM
  91. GRB 030329: Optical pre-Imaging
  92. GRB 030329: visual observations
  93. GRB 030329: OT B and R photometry, decline rate
  94. GRB030329 (=H2652): A Long, Extremely Bright GRB Localized by the HETE WXM and SXC
  95. RXTE detection of GRB 030329 afterglow
  96. GRB 030329: Optical Afterglow Observations
  97. GRB 030328 Optical Observations
  98. GRB030328: Decay index
  99. GRB 030329: OT candidate
  100. GRB030328: optical spectroscopy at TNG

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