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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"

11756 results found.

  1. GRB 020819 : OT candidate - confirmation of non variability
  2. K band observation of GRB 020819
  3. GRB020819(=H2275): A Long Burst Localized by the HETE WXM and SXC
  4. IPN triangulation of GRB020819 (HETE 2275)
  5. GRB020813: Fading X-ray Afterglow Observed with Chandra
  6. GRB020812: NIR observations
  7. GRB020812: optical observations
  8. GRB 020812 : optical afterglow candidate
  9. GRB020813, optical observations
  10. GRB 020812 optical observation
  11. GRB020812(=H2257): A Long Burst Localized by HETE in Near-Real Time
  12. GRB020801: Imaging of Suggested OT Counterpart at the Magellan
  13. GRB020801, optical afterglow candidate
  14. IPN triangulation of GRB020714
  15. GRB 020410: Discovery of Probable OT by HST
  16. Correction to IPN error box for GRB020706
  17. IPN triangulation of GRB020706
  18. GRB 020705: Optical observations
  19. GRB020625 (=H2081): A Long Burst Localized by HETE
  20. AXP 1E2259+586 optical observations
  21. SGR-like Bursts from the AXP 1E 2259+586
  22. GRB 020531, simultaneous optical observations
  23. GRB020531: Second epoch Chandra observations
  24. GRB020531: Observations with the Chandra X-ray Observatory
  25. GRB020531, optical observation
  26. IPN triangulation of the short, hard GRB020531 (=H2042)
  27. GRB020525, optical observations
  28. IPN detection of possible bursts from SGR1806-20
  29. IPN triangulation of GRB020525
  30. HETE Observations of GX354-0 (= MXB1728-34, so-called "Slow
  31. IPN triangulation of a burst from SGR1806-20
  32. GRB 020410, Radio Observations
  33. GRB 020124: Optical observations
  34. IPN triangulation of GRB020418
  35. GRB020410: BeppoSAX NFI observations refined analysis
  36. IPN triangulation of GRB020413
  37. GRB 020409 SARA Observations
  38. GRB 020409, No Optical Detection to R = 20
  39. GRB020410: BeppoSAX NFI observation
  40. GRB 020409, optical observations
  41. GRB020406(?), optical observations
  42. BeppoSAX ALERT: possible GRB020410
  43. GRB020331 optical observations with RIMOTS
  44. GRB020124 optical observations with RIBOTS/RIMOTS
  45. GRB 020321: Candidate X-ray Counterparts
  46. GRB020406(?), optical observations
  47. GRB 020331, NIR observations
  48. GRB020331(=H1963): The "Easter" Burst Detected by HETE
  49. GRB 020321: Optical observations
  50. GRB020317: optical observations
  51. GRB 020317 : KISO Optical Observations
  52. BeppoSAX ALERT: GRB020321, the "Springtime Burst"
  53. GRB 020317: Optical observations
  54. GRB020305: Properties of the Candidate Optical Afterglow
  55. GRB011130 (XRF011130) Second Epoch Chandra Observations
  56. GRB020305, optical observations
  57. GRB 020305: Optical observations
  58. GRB 010921: HST Observations
  59. RXTE Observations of SGR 1900+14
  60. SGR1900+14 activity
  61. IPN Upper Limits to a GRB Associated With SN2002ap
  62. SN2002ap (SN/GRB?) optical spectrographic observations
  63. IPN detection of further activity from SGR1806-20
  64. GRB020127(=H1902): Localization of a Double-Peaked GRB by HETE
  65. IPN observations of SGR1806-20
  66. GRB 020124: Optical afterglow
  67. Possible optical counterpart to a GRB
  68. GRB011212, Optical Observations
  69. GRB011212: Optical observations at Gunma
  70. GRB011212: Optical observations
  71. GRB011130 (=XRF011130): Further analysis of Chandra Target of
  72. GRB001109, Radio Monitoring
  73. GRB011121: fainter still
  74. GRB011121: fading behavior
  75. GRB 011030: TNG K-band observation
  76. XRF011030: Chandra Observations
  77. GRB 011030 I-band Observation
  78. The X-ray Flash 011030 ('GRB 011030')
  79. The Radio Afterglow from the X-ray Rich GRB 011030
  80. GRB 011019 optical observation
  81. Optical observation of SGR 1806-20 at the 6-m SAO telescope
  82. GRB011019: Subaru Optical Observations
  83. GRB 011030 K-band Observations
  84. GRB011019: ROTSE-III optical observations
  85. GRB010921: Spectroscopy of the Host Galaxy
  86. GRB010928(=H1770): Localization of a Long GRB by HETE
  87. GRB001109, Host Galaxy Spectroscopic Observations
  88. Probable SGR or Short Duration GRB Detected by HETE
  89. IPN triangulation of GRB010629
  90. GRB010629: A Burst Localized by HETE
  91. SGR1900+14: Second Burst Localized by HETE
  92. Possible burst from SGR1806-20
  93. SGR1806-20: A Second, Intense Burst Localized by HETE
  94. SGR1806-20: Localization by HETE
  95. X-ray precursors to the large flare from SGR 1900+14
  96. GRB010427, Gamma Ray Observations
  97. BeppoSAX/NFI Follow-up Observation of SGR 1900+14
  98. SGR 1900+14, Chandra observations
  99. GRB010326: Localization by HETE
  100. GRB010214, field photometry

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