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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"

37515 results found.

  1. IPN triangulation of GRB020603 (possible short/hard GRB)
  2. GRB 020531 optical observations with TAROT
  3. Refined IPN error box for GRB020531
  4. GRB020531, optical observations
  5. GRB020531(=H2042): Optical Observations
  6. IPN triangulation of the short, hard GRB020531 (=H2042)
  7. GRB020531(=H2042): Optical Observations
  8. GRB020531(=H2042): A Short, Hard Burst Localized by HETE
  9. GRB 020525: Optical Observations
  10. GRB020525, optical observations
  11. IPN detection of possible bursts from SGR1806-20
  12. IPN triangulation of GRB020525
  13. XRF020427: Chandra Identification of a Likely X-ray Counterpart
  14. IPN triangulation of a burst from SGR1806-20
  15. GRB/XRF 020427, Radio Observations
  16. HST detection of the likely host galaxy of GRB 020124
  17. XRF020427: Chandra Observations and Candidate X-ray Counterparts
  18. GRB(XRF) 020427: X-ray afterglow with BeppoSAX
  19. GRB020321 : Optical observations.
  20. GRB020427 BeppoSAX NFI Observation
  21. XRF 020427
  22. GRB020331: Third Epoch and Revised Second Epoch Optical
  23. The end of BSAX GRB activities
  24. GRB 020410, Radio Observations
  25. GRB 020418: Optical observations
  26. GRB 020124: Optical observations
  27. GRB 020418: Optical observations
  28. IPN triangulation of GRB020418
  29. GRB020405: VLT observations of the OT environment
  30. GRB020410: BeppoSAX NFI observations refined analysis
  31. GRB 020409: Optical Observations
  32. Mars Odyssey joins the IPN
  33. IPN triangulation of GRB020413
  34. GRB 020409, 2-nd epoch optical observations at Terskol.
  35. GRB 020409: Optical observations
  36. GRB 020409, No Optical Detection to R = 22
  37. GRB 020409: No Evidence for an Optical Afterglow
  38. GRB 020409, 2nd epoch optical observations
  39. GRB 020331 Kyoto observation on March 31
  40. GRB 020409
  41. GRB 020409 SARA Observations
  42. GRB "020411"
  43. GRB 020409, No Optical Detection to R = 20
  44. GRB020410: BeppoSAX NFI observation
  45. GRB 020409: Optical observations
  46. April 11 BeppoSAX event (GRB020411) is likely not a GRB
  47. GRB 020410, optical observations
  48. BeppoSAX ALERT: possible GRB020411
  49. GRB 020409, optical observations
  50. GRB 020409: Optical Observations
  51. GRB020406(?), optical observations
  52. GRB020410, optical observations
  53. BeppoSAX ALERT: possible GRB020410
  54. X-ray afterglow of GRB020321
  55. BeppoSAX GRB : GRB020409
  56. GRB020405: VLT optical observations and V band decay slope
  57. GRB020331 optical observations with RIMOTS
  58. GRB020124 optical observations with RIBOTS/RIMOTS
  59. GRB 020321: Candidate X-ray Counterparts
  60. ASM GRB candidate 020406 refined error box
  61. GRB 020405: Moderate-resolution spectroscopy
  62. GRB020406(?), optical observations
  63. GRB020405: VLT optical observations
  64. Revised Photometry of the Optical Afterglow of GRB 020405
  65. GRB020405: OT observations
  66. GRB 020331: Candidate Optical Afterglow
  67. GRB 020405: Decay index
  68. Short RXTE/ASM transient 020406; may be a GRB
  69. GRB020405, Radio Observations
  70. Fading Optical Afterglow and Possible Host Galaxy of GRB 020405
  71. GRB 020405, U-band observations
  72. GRB 020405: Optical afterglow candidate
  73. IPN localization of GRB020405
  74. GRB011212: Optical Observations
  75. GRB 020331: NIR Observations
  76. GRB 020331: NIR Observations
  77. GRB020331 NIR observation at KPNO (re-submission)
  78. GRB02033 NIR observation at KPNO
  79. GRB020331 field photometry
  80. GRB 020331 Optical Observations
  81. GRB 020331, NIR observations
  82. GRB 020331: Optical observations
  83. GRB020331(=H1963): The "Easter" Burst Detected by HETE
  84. GRB 020321: Infrared observations
  85. GRB 020322: BeppoSAX observations of the X-ray afterglow
  86. SN 2002ap - peak brightness date (SN/GRB?)
  87. GRB 020322, Radio observations
  88. Near-Infrared Observations of GRB020322 at TIRGO
  89. GRB 020321, Radio Observations
  90. GRB 020322: Optical Observations
  91. GRB020127: Proposed Host Galaxy Detection and Identification of Afterglow
  92. GRB 020321: Optical observations
  93. GRB020317 BVRI field photometry
  94. GRB011211 revised BVRI field photometry
  95. GRB020305 BVRI field photometry
  96. GRB020322 BVRI field photometry
  97. GRB 020322 optical observations
  98. GRB 020322 optical observation
  99. GRB020317 : Near IR Observations from Mt Abu Observatory
  100. GRB 020322: Optical Sources and Improved Astrometry

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