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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"

38362 results found.

  1. GRB 021125: Radio Observations
  2. IPN triangulation of GRB021206 (small error box)
  3. IPN triangulation of GRB021206 (exceptionally bright; annulus only)
  4. IPN detection of renewed activity from SGR1806-20
  5. IPN triangulation of GRB021205 (large error box)
  6. GRB 021104, GRB 021112 and GRB 021113 - Milagro GeV/TeV Observations
  7. GRB021201, BVRcIc field photometry
  8. GRB 021201, Radio Observations
  9. GRB 021201: Optical Observations
  10. GRB 021201: BOOTES simultaneous optical observations
  11. IPN triangulation of GRB021201 (short/hard burst, small error box)
  12. Radio Catalog of GRB Afterglows
  13. GRB021004, late time optical observations
  14. GRB021004 Chandra Observation
  15. IPN detection of continued SGR1900+14 activity
  16. GRB021125 refined position
  17. IPN triangulation of GRB021115 (annulus)
  18. IPN triangulation of GRB021125B (two large error boxes)
  19. IPN triangulation of GRB021119 (large error box)
  20. IPN triangulation of GRB021125B (annulus)
  21. Improved IPN error box for GRB021125
  22. IPN triangulation of GRB021125 (INTEGRAL BURST)
  23. IPN confirmation of the reactivation of SGR1900+14
  24. IPN detection of possible reactivation of SGR1900+14
  25. GRB021113, SPI ACS observation
  26. IPN triangulation of GRB021119 (annulus)
  27. GRB 021112: Afterglow or Variable Star?
  28. GRB021113: optical observations at Bisei
  29. GRB 021113: Evidence for a Dark Optical Afterglow
  30. GRB 021112, Radio Observations
  31. GRB021112, BVRI field photometry
  32. GRB 021112: Variable Source in R-band search
  33. GRB021112: Optical Observations
  34. GRB021113: Kiso Observations
  35. IPN triangulation of GRB021109 (portion of annulus)
  36. IPN triangulation of GRB021113 (=H2449; annulus)
  37. IPN triangulation of GRB021108 (CORRECTION; TWO LARGE ERROR BOXES)
  38. GRB 021113: Optical observations
  39. GRB 021113: Optical Observations
  40. GRB021113 (=H2449): A Long GRB Localized by HETE
  41. GRB 021112: R-band search
  42. IPN triangulation of GRB021108 (large error box)
  43. GRB021112 (=H2448): A Long GRB Localized by HETE
  44. GRB 021016: Optical Observations
  45. IPN triangulation of GRB021109 (annulus)
  46. IPN triangulation of GRB021108 (annulus)
  47. GRB021004: Near infrared spectroscopy
  48. GRB021104: Optical Observations
  49. IPN triangulation of GRB021104 (annulus)
  50. GRB021104(=H2434): A Long, X-Ray-Rich GRB Localized by HETE
  51. IPN triangulation of bursts from SGR1900+14, November 1-2, 2002
  52. SGR1900+14 activity, November 2-4, 2002
  53. Spectropolarimetry of GRB021004
  54. GRB021104: Candidate present in DSS
  55. IPN triangulation of GRB021102 (annulus)
  56. Detection of activity from SGR 1900+14 with the RXTE/PCA
  57. IPN triangulation of a burst from SGR1900+14 on November 01, 2002
  58. IPN triangulation of a burst from SGR1900+14 on October 29 2002
  59. IPN triangulation of GRB021025 (portion of annulus)
  60. IPN triangulation of GRB021027 (single large error box)
  61. IPN triangulation of GRB021027 (two large error boxes)
  62. IPN triangulation of GRB021027 (annulus)
  63. GRB 021023: Curious K-band Source(s) Just Outside of IPN Localization
  64. IPN triangulation of GRB021025 (annulus)
  65. IPN triangulation of SGR1900+14, October 22 2002
  66. GRB 021004: optical observations
  67. IPN triangulation of GRB021023 (small error boc)
  68. GRB021004: Optical Observations
  69. GRB 020813; likely host galaxy.
  70. IPN triangulation of GRB021020 (smaller error box)
  71. GRB021021(=XRF 021021): An X-ray Flash Localized by HETE
  72. IPN triangulation of GRB021020
  73. GRB 021008, radio observations
  74. GRB 021016, optical observations
  75. GRB 021004: VRI observations at TNG: possible break
  76. GRB021016, optical observations
  77. SGR1900+14: burst on October 10 2002
  78. GRB 021008, optical observations
  79. GRB021016(=H2397): A Long GRB Localized by HETE
  80. IPN triangulation of GRB021016 (small error box)
  81. GRB021004: Optical Observations
  82. IPN triangulation of GRB021014 (large error box)
  83. IPN triangulation of GRB021013 (single error box)
  84. GRB 021004: optical spectroscopy on Oct 11
  85. IPN triangulation of GRB021013 (two small error boxes)
  86. GRB021004: High-resolution optical spectroscopy
  87. IPN triangulation of GRB021013 (annulus)
  88. XRF 020903: flattening of the optical light curve.
  89. GRB021004, UBVRcIc field photometry update
  90. IPN triangulation of GRB021008 (single error box)
  91. GRB021004: Optical Observations
  92. GRB 021004 submm observations
  93. IPN triangulation of GRB021008B (annulus)
  94. IPN triangulation of GRB021008 (two small error boxes)
  95. GRB021004 Chandra HETG Observations
  96. GRB 021004: Optical/NIR Observations
  97. GRB 021004: Additional V-band Polarimetric Observations
  98. GRB021004: optical observation
  99. GRB 021004: Host Galaxy Star Formation Rate
  100. GRB 021004 submm observations

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