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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.

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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"
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submitter:"Judith Racusin"

10927 results found.

  1. IPN triangulation of GRB030215A and GRB030215B (annuli)
  2. IPN triangulation of GRB030204 (small error box)
  3. IPN triangulation of GRB030127 (annulus)
  4. GRB 030115: Further IR observations with IRSF/SIRIUS
  5. GRB 030115: IR observations with IRSF/SIRIUS
  6. GRB030115: R-band counterpart of IR candidate
  7. GRB 021211: R-band observations at late-time
  8. IPN triangulation of GRB030115B (small error box)
  9. GRB030115 (=H2533): A Long GRB Localized by the HETE WXM and SXC
  10. IPN triangulation of GRB030115B (annulus)
  11. GRB030115: R-band observations at Asiago
  12. IPN triangulation of GRB030101 (two large error boxes)
  13. Probable GRB in INTEGRAL SPI-ACS
  14. GRB021219, optical observations
  15. IPN triangulation of GRB021214 (annulus)
  16. GRB 021211, optical observations
  17. GRB 021211, optical observations
  18. GRB021211 - Upper limits from recent and historical observations
  19. GRB021211 (=H2493): A Bright, Long GRB Localized by HETE-2 in Near-Real Time
  20. HETE 2493: Optical observations
  21. IPN triangulation of GRB021201 (short/hard burst, small error box)
  22. GRB021125 refined position
  23. IPN triangulation of GRB021125B (two large error boxes)
  24. GRB021113, SPI ACS observation
  25. GRB021113: optical observations at Bisei
  26. GRB021112: Optical Observations
  27. IPN triangulation of GRB021113 (=H2449; annulus)
  28. GRB021113 (=H2449): A Long GRB Localized by HETE
  29. GRB021112 (=H2448): A Long GRB Localized by HETE
  30. IPN triangulation of GRB021104 (annulus)
  31. GRB021104(=H2434): A Long, X-Ray-Rich GRB Localized by HETE
  32. IPN triangulation of bursts from SGR1900+14, November 1-2, 2002
  33. GRB021104: Candidate present in DSS
  34. IPN triangulation of GRB021025 (portion of annulus)
  35. IPN triangulation of GRB021025 (annulus)
  36. IPN triangulation of GRB021023 (small error boc)
  37. IPN triangulation of GRB021020 (smaller error box)
  38. GRB021021(=XRF 021021): An X-ray Flash Localized by HETE
  39. IPN triangulation of GRB021020
  40. GRB 021004: VRI observations at TNG: possible break
  41. GRB021016(=H2397): A Long GRB Localized by HETE
  42. IPN triangulation of GRB021016 (small error box)
  43. IPN triangulation of GRB021014 (large error box)
  44. GRB021004: High-resolution optical spectroscopy
  45. GRB 021004: Optical/NIR Observations
  46. GRB 021004: Additional V-band Polarimetric Observations
  47. GRB021004: optical observation
  48. GRB 021004: WC wind?
  49. IPN triangulation of GRB021007 (annulus)
  50. XRF 020903 spectrum
  51. GRB021004: optical observations and predicted break time
  52. GRB021004: restart of optical decay
  53. GRB 021004: Optical Decay
  54. HETE fluences for GRB021004
  55. GRB 021004: V-band Polarimetric Observations
  56. GRB021004: Update Bisei photometric data
  57. GRB 021004: Optical Decay
  58. GRB021004, Optical Observations
  59. GRB021004: Upper limits from recent and historical observations
  60. GRB021004(=H2380): Revised Localization with HETE Soft X-ray
  61. GRB021004(=H2380): A Long GRB Localized by HETE in Near-Real Time
  62. XRF020903: TNG and Asiago photometry
  63. XRF 020903: Correction to GCN 1560
  64. XRF 020903: VRI observations
  65. XRF 020903: Supernova
  66. Single IPN error box for GRB020904
  67. IPN triangulation of GRB020904
  68. GRB020903(=H2314): An X-Ray Flash Localized by HETE
  69. GRB020819(=H2275): Revised Localization with HETE Soft X-ray
  70. SGR1900+14 burst localized by HETE
  71. GRB020813: High-resolution optical spectroscopy
  72. Second epoch K band imaging of GRB 020819
  73. K band observation of GRB 020819
  74. GRB020819(=H2275): A Long Burst Localized by the HETE WXM and SXC
  75. IPN triangulation of GRB020819 (HETE 2275)
  76. GRB 020813: addendum to GCN 1498
  77. GRB020813: V-band decay slope
  78. Polarimetry of GRB020813: evidence for variability
  79. GRB020813: High-Resolution Optical Observations
  80. GRB020813(=H2262): Revised Localization with HETE SXC
  81. GRB020813, optical observations
  82. IPN error box for GRB020813
  83. IPN triangulation of GRB020813
  84. GRB020813(=H2262): A Long, Bright Burst Localized by HETE in Near-Real Time
  85. GRB020812(=H2257): A Long Burst Localized by HETE in Near-Real Time
  86. GRB020801: Imaging of Suggested OT Counterpart at the Magellan
  87. GRB020801: Candidate OT present in DSS
  88. HST Imaging of the Host of GRB 011121
  89. Further refinement to IPN error box for GRB020531
  90. GRB020625 (=H2081): A Long Burst Localized by HETE
  91. GRB/XRF 020427, detection of an underlying system with the VLT
  92. AXP 1E2259+586 optical observations
  93. Fading Optical Source in the Field of GRB020531
  94. GRB020405: polarimetric observations
  95. GRB 020531/Candidate Redshift
  96. GRB020531: Second epoch Chandra observations
  97. GRB020531 Optical Observations
  98. GRB020531: Observations with the Chandra X-ray Observatory
  99. GRB020531: Upper Limit for Detection of Two TAROT Sources
  100. Refined IPN error box for GRB020531

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