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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').
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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"
  1. GRB021112: Optical Observations
  2. GRB021113: Kiso Observations
  3. IPN triangulation of GRB021109 (portion of annulus)
  4. IPN triangulation of GRB021113 (=H2449; annulus)
  5. IPN triangulation of GRB021108 (CORRECTION; TWO LARGE ERROR BOXES)
  6. GRB 021113: Optical observations
  7. GRB 021112: RAPTOR Observations
  8. GRB 021113: Optical Observations
  9. GRB 021113: Optical Observations
  10. GRB021113 (=H2449): A Long GRB Localized by HETE
  11. GRB 021112: Optical Observations
  12. GRB 021112: R-band search
  13. IPN triangulation of GRB021108 (large error box)
  14. GRB021112 (=H2448): A Long GRB Localized by HETE
  15. GRB 021016: Optical Observations
  16. IPN triangulation of GRB021109 (annulus)
  17. IPN triangulation of GRB021108 (annulus)
  18. GRB021004: Near infrared spectroscopy
  19. GRB021104: Optical Observations
  20. IPN triangulation of GRB021104 (annulus)
  21. GRB021104(=H2434): A Long, X-Ray-Rich GRB Localized by HETE
  22. IPN triangulation of bursts from SGR1900+14, November 1-2, 2002
  23. SGR1900+14 activity, November 2-4, 2002
  24. Spectropolarimetry of GRB021004
  25. GRB021104: Optical observations
  26. GRB021104: optical observations
  27. GRB021104: Candidate present in DSS
  28. GRB021104: possible optical afterglow
  29. IPN triangulation of GRB021102 (annulus)
  30. Detection of activity from SGR 1900+14 with the RXTE/PCA
  31. IPN triangulation of a burst from SGR1900+14 on November 01, 2002
  32. IPN triangulation of a burst from SGR1900+14 on October 29 2002
  33. IPN triangulation of GRB021025 (portion of annulus)
  34. IPN triangulation of GRB021027 (single large error box)
  35. GRB021004, late-time optical observations
  36. IPN triangulation of GRB021027 (two large error boxes)
  37. GRB 021023: Infrared Imaging
  38. IPN triangulation of GRB021027 (annulus)
  39. GRB 021023: Curious K-band Source(s) Just Outside of IPN Localization
  40. IPN triangulation of GRB021025 (annulus)
  41. IPN triangulation of SGR1900+14, October 22 2002
  42. GRB 021004: optical observations
  43. IPN triangulation of GRB021023 (small error boc)
  44. GRB021004: Optical Observations
  45. GRB 020813; likely host galaxy.
  46. IPN triangulation of GRB021020 (smaller error box)
  47. GRB021021(=XRF 021021): An X-ray Flash Localized by HETE
  48. IPN triangulation of GRB021020
  49. GRB 021008, radio observations
  50. GRB 021016, optical observations
  51. GRB 021004: VRI observations at TNG: possible break
  52. GRB021016, optical observations
  53. SGR1900+14: burst on October 10 2002
  54. GRB 021008, optical observations
  55. GRB021016(=H2397): A Long GRB Localized by HETE
  56. IPN triangulation of GRB021016 (area corrected)
  57. IPN triangulation of GRB021016 (small error box)
  58. GRB021004: Optical Observations
  59. IPN triangulation of GRB021014 (large error box)
  60. IPN triangulation of GRB021013 (single error box)
  61. GRB 021004: optical spectroscopy on Oct 11
  62. IPN triangulation of GRB021013 (two small error boxes)
  63. GRB021004: High-resolution optical spectroscopy
  64. IPN triangulation of GRB021013 (annulus)
  65. XRF 020903: flattening of the optical light curve.
  66. GRB021004, UBVRcIc field photometry update
  67. IPN triangulation of GRB021008 (single error box)
  68. GRB021004: Optical Observations
  69. GRB 021004 submm observations
  70. IPN triangulation of GRB021008B (annulus)
  71. IPN triangulation of GRB021008 (two small error boxes)
  72. GRB021004 Chandra HETG Observations
  73. GRB 021004: Optical/NIR Observations
  74. GRB 021004: Additional V-band Polarimetric Observations
  75. GRB021004: optical observation
  76. GRB 021004: Host Galaxy Star Formation Rate
  77. GRB 021004 submm observations
  78. GRB 021004: WC wind?
  79. IPN triangulation of GRB021008
  80. GRB021004: NIR and Optical observations
  81. GRB 021004: Optical measurement at OHP
  82. GRB 021004: Optical observations, AUDE network
  83. GRB 021004 - VLA Radio Observations
  84. GRB 021004 - Unusual Radio-to-Submm Spectrum
  85. GRB 021004: optical spectroscopy
  86. IPN triangulation of GRB021007 (annulus)
  87. XRF 020903 spectrum
  88. GRB 021004: HST/STIS spectroscopic observations
  89. GRB021004: optical observations and predicted break time
  90. GRB021004: BVRc photometry
  91. GRB 021004 redshift
  92. GRB021004 radio observation
  93. GRB021004: restart of optical decay
  94. GRB 021004: Optical Decay
  95. GRB 021004 continued IR fading
  96. HETE fluences for GRB021004
  97. GRB 021004, spectroscopic observations
  98. GRB021004: not fading anymore?
  99. GRB 021004: Optical Photometry at 2.5 Days
  100. GRB 021004: polarimetric observations

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