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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"

28053 results found.

  1. GRB 020705: Optical observations
  2. GRB 020625, optical observations
  3. GRB 020625: Optical observations
  4. GRB 020531: optical photometry of Chandra sources
  5. GRB020625 (=H2081): A Long Burst Localized by HETE
  6. The Probable Host Galaxy of GRB/XRF 020427
  7. GRB/XRF 020427, detection of an underlying system with the VLT
  8. Gemini IR Detection of AXP 1E 2259+586 Post-Burst
  9. AXP 1E2259+586 optical observations
  10. Fading Optical Source in the Field of GRB020531
  11. GRB 020531, INT+WFC deep optical upper limits
  12. SGR-like Bursts from the AXP 1E 2259+586
  13. GRB020405: polarimetric observations
  14. GRB 020531, simultaneous optical observations
  15. GRB 020531/Candidate Redshift
  16. GRB020531: Detection of Candidate Host Galaxy
  17. GRB020531: Second epoch Chandra observations
  18. GRB020604, optical observations
  19. GRB020604, BVRcIc field photometry
  20. GRB020603, BVRcIc field observations
  21. GRB020531, BVRcIc field photometry
  22. GRB020531 Optical Observations
  23. GRB020531: Observations with the Chandra X-ray Observatory
  24. GRB020531, optical observations
  25. GRB020531: optical observations
  26. GRB020531(=H2042): Optical Observations
  27. GRB020531(=H2042): Optical Observations
  28. GRB020531: Optical observations
  29. GRB020531(=H2042): A Short, Hard Burst Localized by HETE
  30. GRB020525, optical observations
  31. HETE Observations of GX354-0 (= MXB1728-34, so-called "Slow
  32. XRF020427: Chandra Identification of a Likely X-ray Counterpart
  33. HST detection of the likely host galaxy of GRB 020124
  34. GRB020405 field photometry at ESO
  35. XRF020427: Chandra Observations and Candidate X-ray Counterparts
  36. GRB(XRF) 020427: X-ray afterglow with BeppoSAX
  37. GRB020321 : Optical observations.
  38. XRF 020427
  39. GRB 020124: Optical observations
  40. IPN triangulation of GRB020418
  41. GRB020405: VLT observations of the OT environment
  42. IPN triangulation of GRB020413
  43. GRB020405: predicted break
  44. GRB 020409: No Evidence for an Optical Afterglow
  45. GRB 020331 Kyoto observation on March 31
  46. GRB020410: BeppoSAX NFI observation
  47. X-ray afterglow of GRB020321
  48. GRB020331 optical observations with RIMOTS
  49. GRB020124 optical observations with RIBOTS/RIMOTS
  50. GRB 020321: Candidate X-ray Counterparts
  51. GRB020406(?), optical observations
  52. GRB 020405: Decay index
  53. Short RXTE/ASM transient 020406; may be a GRB
  54. GRB020405, Radio Observations
  55. GRB 020405, U-band observations
  56. GRB011212: Optical Observations
  57. GRB 020331: NIR Observations
  58. GRB020331 NIR observation at KPNO (re-submission)
  59. GRB02033 NIR observation at KPNO
  60. GRB020331 field photometry
  61. GRB 020331, NIR observations
  62. GRB020331(=H1963): The "Easter" Burst Detected by HETE
  63. GRB 020322: BeppoSAX observations of the X-ray afterglow
  64. GRB011211: HST Observations of Optical Afterglow and Host Galaxy
  65. Near-Infrared Observations of GRB020322 at TIRGO
  66. GRB 020321, Radio Observations
  67. GRB 020322: Optical Observations
  68. GRB020127: Proposed Host Galaxy Detection and Identification of Afterglow
  69. GRB 020321: Optical observations
  70. GRB020317 BVRI field photometry
  71. GRB011211 revised BVRI field photometry
  72. GRB020305 BVRI field photometry
  73. GRB020322 BVRI field photometry
  74. GRB 020322: Optical Sources and Improved Astrometry
  75. GRB020317: optical observations
  76. GRB020321 optical observations
  77. GRB020321: a faint BeppoSAX detection
  78. GRB 020317 : KISO Optical Observations
  79. GRB020317 (=H1959): Localization by HETE of a Low Fluence GRB
  80. GRB 020305: Optical Observations
  81. GRB020317, optical observations
  82. GRB 020317: Optical observations
  83. GRB 011121: Third HST Epoch
  84. GRB020305: Properties of the Candidate Optical Afterglow
  85. GRB 011121: HST Observations reveal an intermediate-time multicolor
  86. GRB011130 (XRF011130) Second Epoch Chandra Observations
  87. GRB020305: Subaru Optical Observations
  88. XRF/GRB 011030: Detection of the Probable Host Galaxy
  89. GRB 020305: Candidate optical afterglow
  90. GRB020305, optical observations
  91. IPN triangulation of GRB020305 (HETE 1939)
  92. GRB020305 (=H1939): Localization of a GRB by HETE
  93. HST Imaging of the afterglow and host of GRB 011121
  94. IPN detection and localization of Cygnus X-1 flares
  95. SGR1900+14 activity
  96. IPN Upper Limits to a GRB Associated With SN2002ap
  97. GRB020124 BVRI field photometry
  98. GRB020127: Comparison of Chandra Epochs and Identification of Possible Counterparts
  99. SN2002ap (SN/GRB?) Echelle spectra
  100. GRB020127 Optical Observations

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