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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"

10925 results found.

  1. IPN triangulation of GRB030127 (annulus)
  2. GRB 030115: Further IR observations with IRSF/SIRIUS
  3. GRB 030115: IR observations with IRSF/SIRIUS
  4. GRB030115: R-band counterpart of IR candidate
  5. GRB 021211: R-band observations at late-time
  6. IPN triangulation of GRB030115B (small error box)
  7. GRB030115 (=H2533): A Long GRB Localized by the HETE WXM and SXC
  8. IPN triangulation of GRB030115B (annulus)
  9. GRB030115: R-band observations at Asiago
  10. IPN triangulation of GRB030101 (two large error boxes)
  11. Probable GRB in INTEGRAL SPI-ACS
  12. GRB021219, optical observations
  13. IPN triangulation of GRB021214 (annulus)
  14. GRB 021211, optical observations
  15. GRB 021211, optical observations
  16. GRB021211 - Upper limits from recent and historical observations
  17. GRB021211 (=H2493): A Bright, Long GRB Localized by HETE-2 in Near-Real Time
  18. HETE 2493: Optical observations
  19. IPN triangulation of GRB021201 (short/hard burst, small error box)
  20. GRB021125 refined position
  21. IPN triangulation of GRB021125B (two large error boxes)
  22. GRB021113, SPI ACS observation
  23. GRB021113: optical observations at Bisei
  24. GRB021112: Optical Observations
  25. IPN triangulation of GRB021113 (=H2449; annulus)
  26. GRB021113 (=H2449): A Long GRB Localized by HETE
  27. GRB021112 (=H2448): A Long GRB Localized by HETE
  28. IPN triangulation of GRB021104 (annulus)
  29. GRB021104(=H2434): A Long, X-Ray-Rich GRB Localized by HETE
  30. IPN triangulation of bursts from SGR1900+14, November 1-2, 2002
  31. GRB021104: Candidate present in DSS
  32. IPN triangulation of GRB021025 (portion of annulus)
  33. IPN triangulation of GRB021025 (annulus)
  34. IPN triangulation of GRB021023 (small error boc)
  35. IPN triangulation of GRB021020 (smaller error box)
  36. GRB021021(=XRF 021021): An X-ray Flash Localized by HETE
  37. IPN triangulation of GRB021020
  38. GRB 021004: VRI observations at TNG: possible break
  39. GRB021016(=H2397): A Long GRB Localized by HETE
  40. IPN triangulation of GRB021016 (small error box)
  41. IPN triangulation of GRB021014 (large error box)
  42. GRB021004: High-resolution optical spectroscopy
  43. GRB 021004: Optical/NIR Observations
  44. GRB 021004: Additional V-band Polarimetric Observations
  45. GRB021004: optical observation
  46. GRB 021004: WC wind?
  47. IPN triangulation of GRB021007 (annulus)
  48. XRF 020903 spectrum
  49. GRB021004: optical observations and predicted break time
  50. GRB021004: restart of optical decay
  51. GRB 021004: Optical Decay
  52. HETE fluences for GRB021004
  53. GRB 021004: V-band Polarimetric Observations
  54. GRB021004: Update Bisei photometric data
  55. GRB 021004: Optical Decay
  56. GRB021004, Optical Observations
  57. GRB021004: Upper limits from recent and historical observations
  58. GRB021004(=H2380): Revised Localization with HETE Soft X-ray
  59. GRB021004(=H2380): A Long GRB Localized by HETE in Near-Real Time
  60. XRF020903: TNG and Asiago photometry
  61. XRF 020903: Correction to GCN 1560
  62. XRF 020903: VRI observations
  63. XRF 020903: Supernova
  64. Single IPN error box for GRB020904
  65. IPN triangulation of GRB020904
  66. GRB020903(=H2314): An X-Ray Flash Localized by HETE
  67. GRB020819(=H2275): Revised Localization with HETE Soft X-ray
  68. SGR1900+14 burst localized by HETE
  69. GRB020813: High-resolution optical spectroscopy
  70. Second epoch K band imaging of GRB 020819
  71. K band observation of GRB 020819
  72. GRB020819(=H2275): A Long Burst Localized by the HETE WXM and SXC
  73. IPN triangulation of GRB020819 (HETE 2275)
  74. GRB 020813: addendum to GCN 1498
  75. GRB020813: V-band decay slope
  76. Polarimetry of GRB020813: evidence for variability
  77. GRB020813: High-Resolution Optical Observations
  78. GRB020813(=H2262): Revised Localization with HETE SXC
  79. GRB020813, optical observations
  80. IPN error box for GRB020813
  81. IPN triangulation of GRB020813
  82. GRB020813(=H2262): A Long, Bright Burst Localized by HETE in Near-Real Time
  83. GRB020812(=H2257): A Long Burst Localized by HETE in Near-Real Time
  84. GRB020801: Imaging of Suggested OT Counterpart at the Magellan
  85. GRB020801: Candidate OT present in DSS
  86. HST Imaging of the Host of GRB 011121
  87. Further refinement to IPN error box for GRB020531
  88. GRB020625 (=H2081): A Long Burst Localized by HETE
  89. GRB/XRF 020427, detection of an underlying system with the VLT
  90. AXP 1E2259+586 optical observations
  91. Fading Optical Source in the Field of GRB020531
  92. GRB020405: polarimetric observations
  93. GRB 020531/Candidate Redshift
  94. GRB020531: Second epoch Chandra observations
  95. GRB020531 Optical Observations
  96. GRB020531: Observations with the Chandra X-ray Observatory
  97. GRB020531: Upper Limit for Detection of Two TAROT Sources
  98. Refined IPN error box for GRB020531
  99. GRB020531(=H2042): Optical Observations
  100. IPN triangulation of the short, hard GRB020531 (=H2042)

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