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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"

11753 results found.

  1. IPN triangulation of GRB020819 (HETE 2275)
  2. GRB020813: Fading X-ray Afterglow Observed with Chandra
  3. GRB020812: NIR observations
  4. GRB020812: optical observations
  5. GRB 020812 : optical afterglow candidate
  6. GRB020813, optical observations
  7. GRB 020812 optical observation
  8. GRB020812(=H2257): A Long Burst Localized by HETE in Near-Real Time
  9. GRB020801: Imaging of Suggested OT Counterpart at the Magellan
  10. GRB020801, optical afterglow candidate
  11. IPN triangulation of GRB020714
  12. GRB 020410: Discovery of Probable OT by HST
  13. Correction to IPN error box for GRB020706
  14. IPN triangulation of GRB020706
  15. GRB 020705: Optical observations
  16. GRB020625 (=H2081): A Long Burst Localized by HETE
  17. AXP 1E2259+586 optical observations
  18. SGR-like Bursts from the AXP 1E 2259+586
  19. GRB 020531, simultaneous optical observations
  20. GRB020531: Second epoch Chandra observations
  21. GRB020531: Observations with the Chandra X-ray Observatory
  22. GRB020531, optical observation
  23. IPN triangulation of the short, hard GRB020531 (=H2042)
  24. GRB020525, optical observations
  25. IPN detection of possible bursts from SGR1806-20
  26. IPN triangulation of GRB020525
  27. HETE Observations of GX354-0 (= MXB1728-34, so-called "Slow
  28. IPN triangulation of a burst from SGR1806-20
  29. GRB 020410, Radio Observations
  30. GRB 020124: Optical observations
  31. IPN triangulation of GRB020418
  32. GRB020410: BeppoSAX NFI observations refined analysis
  33. IPN triangulation of GRB020413
  34. GRB 020409 SARA Observations
  35. GRB 020409, No Optical Detection to R = 20
  36. GRB020410: BeppoSAX NFI observation
  37. GRB 020409, optical observations
  38. GRB020406(?), optical observations
  39. BeppoSAX ALERT: possible GRB020410
  40. GRB020331 optical observations with RIMOTS
  41. GRB020124 optical observations with RIBOTS/RIMOTS
  42. GRB 020321: Candidate X-ray Counterparts
  43. GRB020406(?), optical observations
  44. GRB 020331, NIR observations
  45. GRB020331(=H1963): The "Easter" Burst Detected by HETE
  46. GRB 020321: Optical observations
  47. GRB020317: optical observations
  48. GRB 020317 : KISO Optical Observations
  49. BeppoSAX ALERT: GRB020321, the "Springtime Burst"
  50. GRB 020317: Optical observations
  51. GRB020305: Properties of the Candidate Optical Afterglow
  52. GRB011130 (XRF011130) Second Epoch Chandra Observations
  53. GRB020305, optical observations
  54. GRB 020305: Optical observations
  55. GRB 010921: HST Observations
  56. RXTE Observations of SGR 1900+14
  57. SGR1900+14 activity
  58. IPN Upper Limits to a GRB Associated With SN2002ap
  59. SN2002ap (SN/GRB?) optical spectrographic observations
  60. IPN detection of further activity from SGR1806-20
  61. GRB020127(=H1902): Localization of a Double-Peaked GRB by HETE
  62. IPN observations of SGR1806-20
  63. GRB 020124: Optical afterglow
  64. Possible optical counterpart to a GRB
  65. GRB011212, Optical Observations
  66. GRB011212: Optical observations at Gunma
  67. GRB011212: Optical observations
  68. GRB011130 (=XRF011130): Further analysis of Chandra Target of
  69. GRB001109, Radio Monitoring
  70. GRB011121: fainter still
  71. GRB011121: fading behavior
  72. GRB 011030: TNG K-band observation
  73. XRF011030: Chandra Observations
  74. GRB 011030 I-band Observation
  75. The X-ray Flash 011030 ('GRB 011030')
  76. The Radio Afterglow from the X-ray Rich GRB 011030
  77. GRB 011019 optical observation
  78. Optical observation of SGR 1806-20 at the 6-m SAO telescope
  79. GRB011019: Subaru Optical Observations
  80. GRB 011030 K-band Observations
  81. GRB011019: ROTSE-III optical observations
  82. GRB010921: Spectroscopy of the Host Galaxy
  83. GRB010928(=H1770): Localization of a Long GRB by HETE
  84. GRB001109, Host Galaxy Spectroscopic Observations
  85. Probable SGR or Short Duration GRB Detected by HETE
  86. IPN triangulation of GRB010629
  87. GRB010629: A Burst Localized by HETE
  88. SGR1900+14: Second Burst Localized by HETE
  89. Possible burst from SGR1806-20
  90. SGR1806-20: A Second, Intense Burst Localized by HETE
  91. SGR1806-20: Localization by HETE
  92. X-ray precursors to the large flare from SGR 1900+14
  93. GRB010427, Gamma Ray Observations
  94. BeppoSAX/NFI Follow-up Observation of SGR 1900+14
  95. SGR 1900+14, Chandra observations
  96. GRB010326: Localization by HETE
  97. GRB010214, field photometry
  98. GRB010222, field photometry
  99. GRB010214B,Gamma Ray Observations
  100. BeppoSAX ALERT: GRB010220

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