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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"

28057 results found.

  1. IPN triangulation of GRB020708
  2. IPN triangulation of GRB020708
  3. Correction to IPN error box for GRB020706
  4. IPN triangulation of GRB020706
  5. GRB 020705: Optical observations
  6. GRB 020625, optical observations
  7. GRB 020625: Optical observations
  8. GRB 020531: optical photometry of Chandra sources
  9. GRB020625 (=H2081): A Long Burst Localized by HETE
  10. The Probable Host Galaxy of GRB/XRF 020427
  11. GRB/XRF 020427, detection of an underlying system with the VLT
  12. Gemini IR Detection of AXP 1E 2259+586 Post-Burst
  13. AXP 1E2259+586 optical observations
  14. Fading Optical Source in the Field of GRB020531
  15. GRB 020531, INT+WFC deep optical upper limits
  16. SGR-like Bursts from the AXP 1E 2259+586
  17. GRB020405: polarimetric observations
  18. GRB 020531, simultaneous optical observations
  19. GRB 020531/Candidate Redshift
  20. GRB020531: Detection of Candidate Host Galaxy
  21. GRB020531: Second epoch Chandra observations
  22. GRB020604, optical observations
  23. GRB020604, BVRcIc field photometry
  24. GRB020603, BVRcIc field observations
  25. GRB020531, BVRcIc field photometry
  26. GRB020531 Optical Observations
  27. GRB020531: Observations with the Chandra X-ray Observatory
  28. GRB020531, optical observations
  29. GRB020531: optical observations
  30. GRB020531(=H2042): Optical Observations
  31. GRB020531(=H2042): Optical Observations
  32. GRB020531: Optical observations
  33. GRB020531(=H2042): A Short, Hard Burst Localized by HETE
  34. GRB020525, optical observations
  35. HETE Observations of GX354-0 (= MXB1728-34, so-called "Slow
  36. XRF020427: Chandra Identification of a Likely X-ray Counterpart
  37. HST detection of the likely host galaxy of GRB 020124
  38. GRB020405 field photometry at ESO
  39. XRF020427: Chandra Observations and Candidate X-ray Counterparts
  40. GRB(XRF) 020427: X-ray afterglow with BeppoSAX
  41. GRB020321 : Optical observations.
  42. XRF 020427
  43. GRB 020124: Optical observations
  44. IPN triangulation of GRB020418
  45. GRB020405: VLT observations of the OT environment
  46. IPN triangulation of GRB020413
  47. GRB020405: predicted break
  48. GRB 020409: No Evidence for an Optical Afterglow
  49. GRB 020331 Kyoto observation on March 31
  50. GRB020410: BeppoSAX NFI observation
  51. X-ray afterglow of GRB020321
  52. GRB020331 optical observations with RIMOTS
  53. GRB020124 optical observations with RIBOTS/RIMOTS
  54. GRB 020321: Candidate X-ray Counterparts
  55. GRB020406(?), optical observations
  56. GRB 020405: Decay index
  57. Short RXTE/ASM transient 020406; may be a GRB
  58. GRB020405, Radio Observations
  59. GRB 020405, U-band observations
  60. GRB011212: Optical Observations
  61. GRB 020331: NIR Observations
  62. GRB020331 NIR observation at KPNO (re-submission)
  63. GRB02033 NIR observation at KPNO
  64. GRB020331 field photometry
  65. GRB 020331, NIR observations
  66. GRB020331(=H1963): The "Easter" Burst Detected by HETE
  67. GRB 020322: BeppoSAX observations of the X-ray afterglow
  68. GRB011211: HST Observations of Optical Afterglow and Host Galaxy
  69. Near-Infrared Observations of GRB020322 at TIRGO
  70. GRB 020321, Radio Observations
  71. GRB 020322: Optical Observations
  72. GRB020127: Proposed Host Galaxy Detection and Identification of Afterglow
  73. GRB 020321: Optical observations
  74. GRB020317 BVRI field photometry
  75. GRB011211 revised BVRI field photometry
  76. GRB020305 BVRI field photometry
  77. GRB020322 BVRI field photometry
  78. GRB 020322: Optical Sources and Improved Astrometry
  79. GRB020317: optical observations
  80. GRB020321 optical observations
  81. GRB020321: a faint BeppoSAX detection
  82. GRB 020317 : KISO Optical Observations
  83. GRB020317 (=H1959): Localization by HETE of a Low Fluence GRB
  84. GRB 020305: Optical Observations
  85. GRB020317, optical observations
  86. GRB 020317: Optical observations
  87. GRB 011121: Third HST Epoch
  88. GRB020305: Properties of the Candidate Optical Afterglow
  89. GRB 011121: HST Observations reveal an intermediate-time multicolor
  90. GRB011130 (XRF011130) Second Epoch Chandra Observations
  91. GRB020305: Subaru Optical Observations
  92. XRF/GRB 011030: Detection of the Probable Host Galaxy
  93. GRB 020305: Candidate optical afterglow
  94. GRB020305, optical observations
  95. IPN triangulation of GRB020305 (HETE 1939)
  96. GRB020305 (=H1939): Localization of a GRB by HETE
  97. HST Imaging of the afterglow and host of GRB 011121
  98. IPN detection and localization of Cygnus X-1 flares
  99. SGR1900+14 activity
  100. IPN Upper Limits to a GRB Associated With SN2002ap

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