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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"
body:"GRB"
submitter:"Judith Racusin"

10919 results found.

  1. GRB030115 (=H2533): A Long GRB Localized by the HETE WXM and SXC
  2. IPN triangulation of GRB030115B (annulus)
  3. GRB030115: R-band observations at Asiago
  4. IPN triangulation of GRB030101 (two large error boxes)
  5. Probable GRB in INTEGRAL SPI-ACS
  6. GRB021219, optical observations
  7. IPN triangulation of GRB021214 (annulus)
  8. GRB 021211, optical observations
  9. GRB 021211, optical observations
  10. GRB021211 - Upper limits from recent and historical observations
  11. GRB021211 (=H2493): A Bright, Long GRB Localized by HETE-2 in Near-Real Time
  12. HETE 2493: Optical observations
  13. IPN triangulation of GRB021201 (short/hard burst, small error box)
  14. GRB021125 refined position
  15. IPN triangulation of GRB021125B (two large error boxes)
  16. GRB021113, SPI ACS observation
  17. GRB021113: optical observations at Bisei
  18. GRB021112: Optical Observations
  19. IPN triangulation of GRB021113 (=H2449; annulus)
  20. GRB021113 (=H2449): A Long GRB Localized by HETE
  21. GRB021112 (=H2448): A Long GRB Localized by HETE
  22. IPN triangulation of GRB021104 (annulus)
  23. GRB021104(=H2434): A Long, X-Ray-Rich GRB Localized by HETE
  24. IPN triangulation of bursts from SGR1900+14, November 1-2, 2002
  25. GRB021104: Candidate present in DSS
  26. IPN triangulation of GRB021025 (portion of annulus)
  27. IPN triangulation of GRB021025 (annulus)
  28. IPN triangulation of GRB021023 (small error boc)
  29. IPN triangulation of GRB021020 (smaller error box)
  30. GRB021021(=XRF 021021): An X-ray Flash Localized by HETE
  31. IPN triangulation of GRB021020
  32. GRB 021004: VRI observations at TNG: possible break
  33. GRB021016(=H2397): A Long GRB Localized by HETE
  34. IPN triangulation of GRB021016 (small error box)
  35. IPN triangulation of GRB021014 (large error box)
  36. GRB021004: High-resolution optical spectroscopy
  37. GRB 021004: Optical/NIR Observations
  38. GRB 021004: Additional V-band Polarimetric Observations
  39. GRB021004: optical observation
  40. GRB 021004: WC wind?
  41. IPN triangulation of GRB021007 (annulus)
  42. XRF 020903 spectrum
  43. GRB021004: optical observations and predicted break time
  44. GRB021004: restart of optical decay
  45. GRB 021004: Optical Decay
  46. HETE fluences for GRB021004
  47. GRB 021004: V-band Polarimetric Observations
  48. GRB021004: Update Bisei photometric data
  49. GRB 021004: Optical Decay
  50. GRB021004, Optical Observations
  51. GRB021004: Upper limits from recent and historical observations
  52. GRB021004(=H2380): Revised Localization with HETE Soft X-ray
  53. GRB021004(=H2380): A Long GRB Localized by HETE in Near-Real Time
  54. XRF020903: TNG and Asiago photometry
  55. XRF 020903: Correction to GCN 1560
  56. XRF 020903: VRI observations
  57. XRF 020903: Supernova
  58. Single IPN error box for GRB020904
  59. IPN triangulation of GRB020904
  60. GRB020903(=H2314): An X-Ray Flash Localized by HETE
  61. GRB020819(=H2275): Revised Localization with HETE Soft X-ray
  62. SGR1900+14 burst localized by HETE
  63. GRB020813: High-resolution optical spectroscopy
  64. Second epoch K band imaging of GRB 020819
  65. K band observation of GRB 020819
  66. GRB020819(=H2275): A Long Burst Localized by the HETE WXM and SXC
  67. IPN triangulation of GRB020819 (HETE 2275)
  68. GRB 020813: addendum to GCN 1498
  69. GRB020813: V-band decay slope
  70. Polarimetry of GRB020813: evidence for variability
  71. GRB020813: High-Resolution Optical Observations
  72. GRB020813(=H2262): Revised Localization with HETE SXC
  73. GRB020813, optical observations
  74. IPN error box for GRB020813
  75. IPN triangulation of GRB020813
  76. GRB020813(=H2262): A Long, Bright Burst Localized by HETE in Near-Real Time
  77. GRB020812(=H2257): A Long Burst Localized by HETE in Near-Real Time
  78. GRB020801: Imaging of Suggested OT Counterpart at the Magellan
  79. GRB020801: Candidate OT present in DSS
  80. HST Imaging of the Host of GRB 011121
  81. Further refinement to IPN error box for GRB020531
  82. GRB020625 (=H2081): A Long Burst Localized by HETE
  83. GRB/XRF 020427, detection of an underlying system with the VLT
  84. AXP 1E2259+586 optical observations
  85. Fading Optical Source in the Field of GRB020531
  86. GRB020405: polarimetric observations
  87. GRB 020531/Candidate Redshift
  88. GRB020531: Second epoch Chandra observations
  89. GRB020531 Optical Observations
  90. GRB020531: Observations with the Chandra X-ray Observatory
  91. GRB020531: Upper Limit for Detection of Two TAROT Sources
  92. Refined IPN error box for GRB020531
  93. GRB020531(=H2042): Optical Observations
  94. IPN triangulation of the short, hard GRB020531 (=H2042)
  95. GRB020531(=H2042): Optical Observations
  96. GRB020531(=H2042): A Short, Hard Burst Localized by HETE
  97. HETE Observations of GX354-0 (= MXB1728-34, so-called "Slow
  98. GRB020405 field photometry at ESO
  99. GRB020331: Third Epoch and Revised Second Epoch Optical
  100. GRB020405: VLT observations of the OT environment

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