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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"

19182 results found.

  1. IPN triangulation of GRB020715 (=GRB150702)
  2. IPN triangulation of GRB020714
  3. IPN triangulation of GRB150702
  4. GRB 020410: Discovery of Probable OT by HST
  5. IPN triangulation of GRB020708
  6. IPN triangulation of GRB020708
  7. Correction to IPN error box for GRB020706
  8. IPN triangulation of GRB020706
  9. GRB 020705: Optical observations
  10. GRB 020625, optical observations
  11. GRB 020625: Optical observations
  12. GRB 020531: optical photometry of Chandra sources
  13. The Probable Host Galaxy of GRB/XRF 020427
  14. GRB/XRF 020427, detection of an underlying system with the VLT
  15. Gemini IR Detection of AXP 1E 2259+586 Post-Burst
  16. SGR-like X-ray Bursts from AXP 1E 2259+586: follow-up
  17. AXP 1E2259+586: quasi-simultaneous optical observation
  18. AXP 1E2259+586 optical observations
  19. Fading Optical Source in the Field of GRB020531
  20. GRB 020531, INT+WFC deep optical upper limits
  21. GRB020405: polarimetric observations
  22. GRB 020531, simultaneous optical observations
  23. GRB020531: Second epoch Chandra observations
  24. GRB020604, optical observations
  25. GRB020604, BVRcIc field photometry
  26. GRB020603, BVRcIc field observations
  27. GRB020531, BVRcIc field photometry
  28. GRB020531 Optical Observations
  29. GRB020531: Observations with the Chandra X-ray Observatory
  30. IPN triangulation of GRB020603 (possible short/hard GRB)
  31. GRB020531, optical observations
  32. GRB020531: optical observations
  33. GRB020531(=H2042): Optical Observations
  34. GRB020531(=H2042): Optical Observations
  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. GRB020405 field photometry at ESO
  39. GRB(XRF) 020427: X-ray afterglow with BeppoSAX
  40. GRB020321 : Optical observations.
  41. XRF 020427
  42. The end of BSAX GRB activities
  43. GRB 020410, Radio Observations
  44. GRB 020124: Optical observations
  45. IPN triangulation of GRB020418
  46. GRB020405: VLT observations of the OT environment
  47. IPN triangulation of GRB020413
  48. GRB 020409: No Evidence for an Optical Afterglow
  49. GRB 020331 Kyoto observation on March 31
  50. GRB 020409: Optical observations
  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. GRB020405, Radio Observations
  57. GRB 020405, U-band observations
  58. GRB011212: Optical Observations
  59. GRB020331 NIR observation at KPNO (re-submission)
  60. GRB02033 NIR observation at KPNO
  61. GRB020331 field photometry
  62. GRB 020331, NIR observations
  63. GRB020331(=H1963): The "Easter" Burst Detected by HETE
  64. GRB 020322: BeppoSAX observations of the X-ray afterglow
  65. GRB011211: HST Observations of Optical Afterglow and Host Galaxy
  66. Near-Infrared Observations of GRB020322 at TIRGO
  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. GRB020317 : Near IR Observations from Mt Abu Observatory
  75. GRB 020322: Optical Sources and Improved Astrometry
  76. GRB 011121: Fourth Epoch of HST Imaging
  77. GRB020317: optical observations
  78. GRB020321 optical observations
  79. GRB020321: a faint BeppoSAX detection
  80. GRB 020317 : KISO Optical Observations
  81. GRB 020305: Optical Observations
  82. GRB020317, optical observations
  83. GRB 020317: Optical observations
  84. GRB020305: Properties of the Candidate Optical Afterglow
  85. GRB 011121: HST Observations reveal an intermediate-time multicolor
  86. GRB011121, possible supernova association
  87. GRB011130 (XRF011130) Second Epoch Chandra Observations
  88. XRF/GRB 011030: Detection of the Probable Host Galaxy
  89. GRB020305, optical observations
  90. HST Imaging of the afterglow and host of GRB 011121
  91. GRB 010921: HST Observations
  92. IPN detection and localization of Cygnus X-1 flares
  93. SGR1900+14 activity
  94. IPN/HETE Detection of Bursts from SGR1900+14
  95. IPN Upper Limits to a GRB Associated With SN2002ap
  96. GRB020124 BVRI field photometry
  97. GRB020127: Palomar and VLA Observations of Possible Counterparts
  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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