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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"

24664 results found.

  1. GRB020331: Late-time Optical Light Curve
  2. IPN triangulation of GRB020714
  3. IPN triangulation of GRB020715 (=GRB150702)
  4. IPN triangulation of GRB020714
  5. IPN triangulation of GRB150702
  6. GRB 020410: Discovery of Probable OT by HST
  7. GRB 020124, HST observations of the fading afterglow
  8. IPN triangulation of GRB020708
  9. IPN triangulation of GRB020708
  10. Correction to IPN error box for GRB020706
  11. IPN triangulation of GRB020706
  12. GRB 020705: Optical observations
  13. GRB 020625, optical observations
  14. GRB 020625: Optical observations
  15. GRB 020531: optical photometry of Chandra sources
  16. GRB020625 (=H2081): A Long Burst Localized by HETE
  17. The Probable Host Galaxy of GRB/XRF 020427
  18. GRB/XRF 020427, detection of an underlying system with the VLT
  19. Gemini IR Detection of AXP 1E 2259+586 Post-Burst
  20. AXP 1E2259+586 optical observations
  21. Fading Optical Source in the Field of GRB020531
  22. GRB 020531, INT+WFC deep optical upper limits
  23. SGR-like Bursts from the AXP 1E 2259+586
  24. GRB020405: polarimetric observations
  25. GRB 020531, simultaneous optical observations
  26. GRB 020531/Candidate Redshift
  27. GRB020531: Detection of Candidate Host Galaxy
  28. GRB020531: Second epoch Chandra observations
  29. GRB020604, optical observations
  30. GRB020604, BVRcIc field photometry
  31. GRB020603, BVRcIc field observations
  32. GRB020531, BVRcIc field photometry
  33. GRB020531 Optical Observations
  34. GRB020531: Observations with the Chandra X-ray Observatory
  35. GRB020531, optical observations
  36. GRB020531: optical observations
  37. GRB020531(=H2042): Optical Observations
  38. GRB020531(=H2042): Optical Observations
  39. GRB020531: Optical observations
  40. GRB020531(=H2042): A Short, Hard Burst Localized by HETE
  41. GRB020525, optical observations
  42. HETE Observations of GX354-0 (= MXB1728-34, so-called "Slow
  43. XRF020427: Chandra Identification of a Likely X-ray Counterpart
  44. HST detection of the likely host galaxy of GRB 020124
  45. GRB020405 field photometry at ESO
  46. XRF020427: Chandra Observations and Candidate X-ray Counterparts
  47. GRB(XRF) 020427: X-ray afterglow with BeppoSAX
  48. GRB020321 : Optical observations.
  49. XRF 020427
  50. GRB 020124: Optical observations
  51. IPN triangulation of GRB020418
  52. GRB020405: VLT observations of the OT environment
  53. IPN triangulation of GRB020413
  54. GRB020405: predicted break
  55. GRB 020409: No Evidence for an Optical Afterglow
  56. GRB 020331 Kyoto observation on March 31
  57. GRB020410: BeppoSAX NFI observation
  58. X-ray afterglow of GRB020321
  59. GRB020331 optical observations with RIMOTS
  60. GRB020124 optical observations with RIBOTS/RIMOTS
  61. GRB 020321: Candidate X-ray Counterparts
  62. GRB020406(?), optical observations
  63. GRB 020405: Decay index
  64. Short RXTE/ASM transient 020406; may be a GRB
  65. GRB020405, Radio Observations
  66. GRB 020405, U-band observations
  67. GRB011212: Optical Observations
  68. GRB 020331: NIR Observations
  69. GRB020331 NIR observation at KPNO (re-submission)
  70. GRB02033 NIR observation at KPNO
  71. GRB020331 field photometry
  72. GRB 020331, NIR observations
  73. GRB020331(=H1963): The "Easter" Burst Detected by HETE
  74. GRB 020322: BeppoSAX observations of the X-ray afterglow
  75. GRB011211: HST Observations of Optical Afterglow and Host Galaxy
  76. Near-Infrared Observations of GRB020322 at TIRGO
  77. GRB 020321, Radio Observations
  78. GRB 020322: Optical Observations
  79. GRB020127: Proposed Host Galaxy Detection and Identification of Afterglow
  80. GRB 020321: Optical observations
  81. GRB020317 BVRI field photometry
  82. GRB011211 revised BVRI field photometry
  83. GRB020305 BVRI field photometry
  84. GRB020322 BVRI field photometry
  85. GRB 020322: Optical Sources and Improved Astrometry
  86. GRB020317: optical observations
  87. GRB020321 optical observations
  88. GRB020321: a faint BeppoSAX detection
  89. GRB 020317 : KISO Optical Observations
  90. GRB020317 (=H1959): Localization by HETE of a Low Fluence GRB
  91. GRB 020305: Optical Observations
  92. GRB020317, optical observations
  93. GRB 020317: Optical observations
  94. GRB 011121: Third HST Epoch
  95. GRB020305: Properties of the Candidate Optical Afterglow
  96. GRB 011121: HST Observations reveal an intermediate-time multicolor
  97. GRB011130 (XRF011130) Second Epoch Chandra Observations
  98. GRB020305: Subaru Optical Observations
  99. XRF/GRB 011030: Detection of the Probable Host Galaxy
  100. GRB 020305: Candidate optical afterglow

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