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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"

28058 results found.

  1. GRB 020124, HST observations of the fading afterglow
  2. IPN triangulation of GRB020708
  3. IPN triangulation of GRB020708
  4. Correction to IPN error box for GRB020706
  5. IPN triangulation of GRB020706
  6. GRB 020705: Optical observations
  7. GRB 020625, optical observations
  8. GRB 020625: Optical observations
  9. GRB 020531: optical photometry of Chandra sources
  10. GRB020625 (=H2081): A Long Burst Localized by HETE
  11. The Probable Host Galaxy of GRB/XRF 020427
  12. GRB/XRF 020427, detection of an underlying system with the VLT
  13. Gemini IR Detection of AXP 1E 2259+586 Post-Burst
  14. AXP 1E2259+586 optical observations
  15. Fading Optical Source in the Field of GRB020531
  16. GRB 020531, INT+WFC deep optical upper limits
  17. SGR-like Bursts from the AXP 1E 2259+586
  18. GRB020405: polarimetric observations
  19. GRB 020531, simultaneous optical observations
  20. GRB 020531/Candidate Redshift
  21. GRB020531: Detection of Candidate Host Galaxy
  22. GRB020531: Second epoch Chandra observations
  23. GRB020604, optical observations
  24. GRB020604, BVRcIc field photometry
  25. GRB020603, BVRcIc field observations
  26. GRB020531, BVRcIc field photometry
  27. GRB020531 Optical Observations
  28. GRB020531: Observations with the Chandra X-ray Observatory
  29. GRB020531, optical observations
  30. GRB020531: optical observations
  31. GRB020531(=H2042): Optical Observations
  32. GRB020531(=H2042): Optical Observations
  33. GRB020531: Optical observations
  34. GRB020531(=H2042): A Short, Hard Burst Localized by HETE
  35. GRB020525, optical observations
  36. HETE Observations of GX354-0 (= MXB1728-34, so-called "Slow
  37. XRF020427: Chandra Identification of a Likely X-ray Counterpart
  38. HST detection of the likely host galaxy of GRB 020124
  39. GRB020405 field photometry at ESO
  40. XRF020427: Chandra Observations and Candidate X-ray Counterparts
  41. GRB(XRF) 020427: X-ray afterglow with BeppoSAX
  42. GRB020321 : Optical observations.
  43. XRF 020427
  44. GRB 020124: Optical observations
  45. IPN triangulation of GRB020418
  46. GRB020405: VLT observations of the OT environment
  47. IPN triangulation of GRB020413
  48. GRB020405: predicted break
  49. GRB 020409: No Evidence for an Optical Afterglow
  50. GRB 020331 Kyoto observation on March 31
  51. GRB020410: BeppoSAX NFI observation
  52. X-ray afterglow of GRB020321
  53. GRB020331 optical observations with RIMOTS
  54. GRB020124 optical observations with RIBOTS/RIMOTS
  55. GRB 020321: Candidate X-ray Counterparts
  56. GRB020406(?), optical observations
  57. GRB 020405: Decay index
  58. Short RXTE/ASM transient 020406; may be a GRB
  59. GRB020405, Radio Observations
  60. GRB 020405, U-band observations
  61. GRB011212: Optical Observations
  62. GRB 020331: NIR Observations
  63. GRB020331 NIR observation at KPNO (re-submission)
  64. GRB02033 NIR observation at KPNO
  65. GRB020331 field photometry
  66. GRB 020331, NIR observations
  67. GRB020331(=H1963): The "Easter" Burst Detected by HETE
  68. GRB 020322: BeppoSAX observations of the X-ray afterglow
  69. GRB011211: HST Observations of Optical Afterglow and Host Galaxy
  70. Near-Infrared Observations of GRB020322 at TIRGO
  71. GRB 020321, Radio Observations
  72. GRB 020322: Optical Observations
  73. GRB020127: Proposed Host Galaxy Detection and Identification of Afterglow
  74. GRB 020321: Optical observations
  75. GRB020317 BVRI field photometry
  76. GRB011211 revised BVRI field photometry
  77. GRB020305 BVRI field photometry
  78. GRB020322 BVRI field photometry
  79. GRB 020322: Optical Sources and Improved Astrometry
  80. GRB020317: optical observations
  81. GRB020321 optical observations
  82. GRB020321: a faint BeppoSAX detection
  83. GRB 020317 : KISO Optical Observations
  84. GRB020317 (=H1959): Localization by HETE of a Low Fluence GRB
  85. GRB 020305: Optical Observations
  86. GRB020317, optical observations
  87. GRB 020317: Optical observations
  88. GRB 011121: Third HST Epoch
  89. GRB020305: Properties of the Candidate Optical Afterglow
  90. GRB 011121: HST Observations reveal an intermediate-time multicolor
  91. GRB011130 (XRF011130) Second Epoch Chandra Observations
  92. GRB020305: Subaru Optical Observations
  93. XRF/GRB 011030: Detection of the Probable Host Galaxy
  94. GRB 020305: Candidate optical afterglow
  95. GRB020305, optical observations
  96. IPN triangulation of GRB020305 (HETE 1939)
  97. GRB020305 (=H1939): Localization of a GRB by HETE
  98. HST Imaging of the afterglow and host of GRB 011121
  99. IPN detection and localization of Cygnus X-1 flares
  100. SGR1900+14 activity

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