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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').
Advanced Search

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"

32902 results found.

  1. GRB(XRF) 020427: X-ray afterglow with BeppoSAX
  2. GRB020321 : Optical observations.
  3. GRB020427 BeppoSAX NFI Observation
  4. XRF 020427
  5. GRB020331: Third Epoch and Revised Second Epoch Optical
  6. The end of BSAX GRB activities
  7. GRB 020410, Radio Observations
  8. GRB 020418: Optical observations
  9. GRB 020124: Optical observations
  10. GRB 020418: Optical observations
  11. IPN triangulation of GRB020418
  12. GRB020405: VLT observations of the OT environment
  13. GRB020410: BeppoSAX NFI observations refined analysis
  14. GRB 020409: Optical Observations
  15. Mars Odyssey joins the IPN
  16. IPN triangulation of GRB020413
  17. GRB 020409, 2-nd epoch optical observations at Terskol.
  18. GRB 020409: Optical observations
  19. GRB 020409, No Optical Detection to R = 22
  20. GRB 020409: No Evidence for an Optical Afterglow
  21. GRB 020409, 2nd epoch optical observations
  22. GRB 020331 Kyoto observation on March 31
  23. GRB 020409
  24. GRB 020409 SARA Observations
  25. GRB "020411"
  26. GRB 020409, No Optical Detection to R = 20
  27. GRB020410: BeppoSAX NFI observation
  28. GRB 020409: Optical observations
  29. April 11 BeppoSAX event (GRB020411) is likely not a GRB
  30. GRB 020410, optical observations
  31. BeppoSAX ALERT: possible GRB020411
  32. GRB 020409, optical observations
  33. GRB 020409: Optical Observations
  34. GRB020406(?), optical observations
  35. GRB020410, optical observations
  36. BeppoSAX ALERT: possible GRB020410
  37. X-ray afterglow of GRB020321
  38. BeppoSAX GRB : GRB020409
  39. GRB020405: VLT optical observations and V band decay slope
  40. GRB020331 optical observations with RIMOTS
  41. GRB020124 optical observations with RIBOTS/RIMOTS
  42. GRB 020321: Candidate X-ray Counterparts
  43. ASM GRB candidate 020406 refined error box
  44. GRB 020405: Moderate-resolution spectroscopy
  45. GRB020406(?), optical observations
  46. GRB020405: VLT optical observations
  47. Revised Photometry of the Optical Afterglow of GRB 020405
  48. GRB020405: OT observations
  49. GRB 020331: Candidate Optical Afterglow
  50. GRB 020405: Decay index
  51. Short RXTE/ASM transient 020406; may be a GRB
  52. GRB020405, Radio Observations
  53. Fading Optical Afterglow and Possible Host Galaxy of GRB 020405
  54. GRB 020405, U-band observations
  55. GRB 020405: Optical afterglow candidate
  56. IPN localization of GRB020405
  57. GRB011212: Optical Observations
  58. GRB 020331: NIR Observations
  59. GRB 020331: NIR Observations
  60. GRB020331 NIR observation at KPNO (re-submission)
  61. GRB02033 NIR observation at KPNO
  62. GRB020331 field photometry
  63. GRB 020331 Optical Observations
  64. GRB 020331, NIR observations
  65. GRB 020331: Optical observations
  66. GRB020331(=H1963): The "Easter" Burst Detected by HETE
  67. GRB 020321: Infrared observations
  68. GRB 020322: BeppoSAX observations of the X-ray afterglow
  69. SN 2002ap - peak brightness date (SN/GRB?)
  70. GRB 020322, Radio observations
  71. Near-Infrared Observations of GRB020322 at TIRGO
  72. GRB 020321, Radio Observations
  73. GRB 020322: Optical Observations
  74. GRB020127: Proposed Host Galaxy Detection and Identification of Afterglow
  75. GRB 020321: Optical observations
  76. GRB020317 BVRI field photometry
  77. GRB011211 revised BVRI field photometry
  78. GRB020305 BVRI field photometry
  79. GRB020322 BVRI field photometry
  80. GRB 020322 optical observations
  81. GRB 020322 optical observation
  82. GRB020317 : Near IR Observations from Mt Abu Observatory
  83. GRB 020322: Optical Sources and Improved Astrometry
  84. GRB020322, optical observations
  85. GRB 020322: Optical candidate
  86. GRB020322: BeppoSAX/NFI Observations
  87. Bepposax GRB020322 The second springtime BSAX GRB
  88. GRB 020321: Optical observations
  89. GRB 011121: Fourth Epoch of HST Imaging
  90. GRB020317: optical observations
  91. GRB020321 optical observations
  92. GRB020321: BeppoSAX/NFI Observations
  93. GRB020321: a faint BeppoSAX detection
  94. GRB 020317 : KISO Optical Observations
  95. BeppoSAX ALERT: GRB020321, the "Springtime Burst"
  96. GRB020317 (=H1959): Localization by HETE of a Low Fluence GRB
  97. GRB 020305: Optical Observations
  98. GRB020317, optical observations
  99. GRB 020317: Optical observations
  100. GRB 011121: Third HST Epoch

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