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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"

23417 results found.

  1. IPN triangulation of GRB030422 (two large error boxes)
  2. IPN triangulation of GRB030421 (annulus)
  3. MASTER:optical observations GRB030418
  4. MASTER:optical observations probable GRB030414
  5. IPN triangulation of GRB030419 (annulus)
  6. GRB030418: Upper limits from recent and historical observations.
  7. GRB030418: Kiso near infrared observations
  8. OT GRB 030329: early spectrum
  9. GRB030324: Candidate Optical Afterglow
  10. IPN triangulation of GRB030414 (small error box)
  11. GRB 030413: Optical Observations
  12. IPN triangulation of GRB030413 (small error box)
  13. IPN triangulation of GRB030410 (annulus)
  14. Superluminal motion in GRB 030329 (Correction)
  15. Superluminal motion in GRB 030329
  16. GRB 030329 and SN 2003dh
  17. GRB030329, optical position
  18. IPN triangulation of GRB030406 (small error box)
  19. IPN triangulation of GRB050403 (small error box)
  20. IPN triangulation of GRB030403 (annulus)
  21. GRB 030329: BVRI photometry at Asiago
  22. GRB 030329, light curve flattens
  23. GRB 030329: VLT V-band photometry
  24. Kiso observation of the GRB030329 at April 6
  25. GRB030328, UBVRcIc field photometry
  26. GRB 030329 Optical observations
  27. GRB030329: Kiso B and R band observations
  28. GRB030328: R upper limit after 6 hours by MASTER
  29. GRB 030329, BVRI photometry
  30. SDSS 0.5m PT observations of GRB030329 (correction)
  31. SDSS 0.5m PT observations of GRB030329
  32. GRB 030329, nearby galaxies
  33. GRB030329: final R-band light curve by MASTER
  34. GRB030329 Radio 23/43/90 GHz observations at Nobeyama
  35. GRB030329, optical observation
  36. GRB030329, new UBVRcIc field photometry
  37. GRB 030329, light curve and SN prediction
  38. GRB030328: Full Observation, X-ray Fading and Spectrum Measured
  39. GRB030329: Optical observations at Teramo
  40. GRB 030329: Radio observations at GMRT
  41. GRB 030329: Additional Mt. Laguna Optical Observations
  42. GRB 030329: Observations with ANDICAM
  43. triangulation of GRB 030331 (single error box)
  44. AAVSO V & R observations of GRB030329
  45. IPN triangulation of GRB030331 (annulus)
  46. GRB 030329: optical observations
  47. IPN triangulation of GRB030329b (large error box)
  48. Photometry of GRB030329 - Constant OT Magnitude
  49. GRB 030324: Optical and NIR Observations
  50. GRB030329: R band light curve by MASTER
  51. GRB030329 - Light curve flattening
  52. GRB 030324, optical search
  53. GRB030329 - near contemporaneous optical limits from CONCAM
  54. GRB 030329, optical observations
  55. GRB030328: X-ray Fading and Spectrum Measured with Chandra
  56. GRB030329b: detection by Konus-Wind and Helicon-CoronasF
  57. GRB030329, BVRcIc field photometry
  58. GRB030329, SPM optical observations
  59. GRB030329 optical observations
  60. GRB 030329: Optical pre-Imaging
  61. GRB 030329: Upper limit from 5.6 hours before trigger
  62. GRB030328: X-ray Afterglow Observed with Chandra
  63. GRB 030329, R-band observations
  64. GRB030329: Upper limits from recent and historical observations.
  65. GRB 030329: Optical Afterglow Observations
  66. GRB 030328: optical observations
  67. GRB 030329: Optical afterglow fading
  68. GRB 030328: OT photometry
  69. GRB030328: optical photometry at the TNG
  70. GRB 030328: Optical observations
  71. GRB030324 optical observation
  72. GRB030131, BVRcIc field photometry
  73. Possible GRB030323 localized by INTEGRAL
  74. GRB030323: Detection on 2003/03/24
  75. IPN triangulation of GRB030326 (single small error box)
  76. GRB030324, optical observations
  77. IPN triangulation of GRB030325 (two small error boxes)
  78. GRB 030324: TAROT optical observations
  79. GRB030323: V, R, I photometry
  80. GRB030323: Upper limits from recent and historical observations.
  81. VLT/FORS2 spectra of GRB 030323
  82. GRB030323, optical observations
  83. GRB030324, BVRcIc field photometry
  84. GRB030323, BVRcIc field calibration
  85. GRB 030324 optical observations
  86. IPN triangulation of GRB030320B (annulus)
  87. IPN triangulation of GRB030320 (small error box)
  88. Possible GRB 030320 localized by INTEGRAL
  89. IPN triangulation of GRB030317 (annulus)
  90. IPN triangulation of GRB030307 (annulus)
  91. GRB 030227: Optical limit at RIKEN
  92. GRB 030226 Optical observations
  93. IPN triangulation of GRB030306 (single small error box - REVISED)
  94. IPN triangulation of GRB030306 (single small error box)
  95. IPN triangulation of GRB030306 (two small error boxes)
  96. IPN triangulation of GRB030304 (annulus)
  97. GRB 030227: Optical observations
  98. GRB030226, BVRc observations
  99. Chandra detection of the X-ray afterglow of GRB 030226
  100. GRB 030226, further optical/NIR imaging

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