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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"

28055 results found.

  1. IPN triangulation of GRB030414 (small error box)
  2. IPN triangulation of GRB030413 (small error box)
  3. Superluminal motion in GRB 030329 (Correction)
  4. Superluminal motion in GRB 030329
  5. GRB030329, optical position
  6. IPN triangulation of GRB030406 (small error box)
  7. IPN triangulation of GRB050403 (small error box)
  8. GRB 030329: BVRI photometry at Asiago
  9. GRB 030329: VLT V-band photometry
  10. Kiso observation of the GRB030329 at April 6
  11. GRB 030329, color evolution
  12. GRB030328, UBVRcIc field photometry
  13. GRB 030329 Optical observations
  14. GRB030329: Kiso B and R band observations
  15. GRB030328: R upper limit after 6 hours by MASTER
  16. SDSS 0.5m PT observations of GRB030329 (correction)
  17. SDSS 0.5m PT observations of GRB030329
  18. GRB030329: final R-band light curve by MASTER
  19. GRB030329, optical observation
  20. GRB030329, new UBVRcIc field photometry
  21. GRB 030329, light curve and SN prediction
  22. GRB 030329, BRI photometry
  23. GRB030328: Full Observation, X-ray Fading and Spectrum Measured
  24. GRB030329: Optical observations at Teramo
  25. GRB 030329: Radio observations at GMRT
  26. Further AAVSO V,B,R observations of GRB030329
  27. GRB 030329: Additional Mt. Laguna Optical Observations
  28. GRB 030329: Observations with ANDICAM
  29. GRB030329: further optical photometry and evidence for a light curve discontinuity
  30. triangulation of GRB 030331 (single error box)
  31. GRB 030329: optical observations
  32. Photometry of GRB030329 - Constant OT Magnitude
  33. GRB030329 - OT brightens
  34. GRB 030329, optical photometry
  35. GRB 030324: Optical and NIR Observations
  36. GRB030329: R band light curve by MASTER
  37. GRB030329 - Light curve flattening
  38. GRB 030324, optical search
  39. GRB 030329, optical observations
  40. GRB030328: X-ray Fading and Spectrum Measured with Chandra
  41. GRB030329a: detection by Konus-Wind
  42. GRB030329b: detection by Konus-Wind and Helicon-CoronasF
  43. GRB030329, BVRcIc field photometry
  44. GRB030329, SPM optical observations
  45. GRB 030329: Optical decay and synthesis
  46. GRB030329 optical observations
  47. GRB 030329: Optical pre-Imaging
  48. GRB 030329: Upper limit from 5.6 hours before trigger
  49. GRB030328: X-ray Afterglow Observed with Chandra
  50. GRB 030329, R-band observations
  51. GRB 030329: OT B and R photometry, decline rate
  52. GRB030329: Upper limits from recent and historical observations.
  53. GRB030329 (=H2652): A Long, Extremely Bright GRB Localized by the HETE WXM and SXC
  54. GRB 030329: Optical Afterglow Observations
  55. GRB 030328: optical observations
  56. GRB 030329: Optical afterglow fading
  57. GRB 030328: OT photometry
  58. GRB030328: optical spectroscopy at TNG
  59. GRB030328: optical photometry at the TNG
  60. VLT spectra of GRB 030328
  61. GRB030328 (=H2650): A Long, Bright GRB Localized by the HETE WXM and SXC
  62. GRB 030328: Optical observations
  63. GRB030324 optical observation
  64. GRB030131, BVRcIc field photometry
  65. Possible GRB030323 localized by INTEGRAL
  66. GRB030323: Detection on 2003/03/24
  67. IPN triangulation of GRB030326 (single small error box)
  68. IPN triangulation of GRB030325 (two small error boxes)
  69. GRB030323: V, R, I photometry
  70. GRB030323 (=H2640): A Faint, Long GRB Localized by the HETE WXM and SXC
  71. GRB030324 (=H2641): A Long GRB Localized in Real Time by the HETE WXM
  72. VLT/FORS2 spectra of GRB 030323
  73. GRB030323, optical observations
  74. GRB030324, BVRcIc field photometry
  75. GRB030323, BVRcIc field calibration
  76. IPN triangulation of GRB030320 (small error box)
  77. Possible GRB 030320 localized by INTEGRAL
  78. IPN triangulation of GRB030306 (single small error box - REVISED)
  79. IPN triangulation of GRB030306 (single small error box)
  80. IPN triangulation of GRB030306 (two small error boxes)
  81. GRB030226, BVRc observations
  82. Chandra detection of the X-ray afterglow of GRB 030226
  83. GRB030227: Kiso optical upper limit
  84. GRB030227, BVRcIc field photometry
  85. GRB030226, BVRcIc field calibration
  86. GRB 030228, optical observations
  87. GRB 030227: Confirmed Optical Afterglow (S1-A)
  88. GRB 030227: fading of candidate optical afterglow 'S1-A'
  89. GRB030227:Optical observations
  90. GRB 030227, possible optical counterpart of XMM-Newton source
  91. GRB030227 - faint tentative OT candidate
  92. GRB 030226, optical observations
  93. XMM-Newton observation of GRB030227
  94. GRB030227: Kiso optical observations
  95. GRB 030227: Kyoto optical observation
  96. GRB 030226, optical light curve
  97. GRB030227 localized by INTEGRAL
  98. GRB 030226 : Predicted light curve
  99. GRB030226: ESI spectroscopy
  100. GRB030226 (=U10893): A Long GRB Localized by the HETE WXM and SXC

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