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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"

42814 results found.

  1. GRB020531: Upper Limit for Detection of Two TAROT Sources
  2. GRB 020603: Optical observations
  3. IPN triangulation of GRB020603 (possible short/hard GRB)
  4. GRB 020531 optical observations with TAROT
  5. Refined IPN error box for GRB020531
  6. GRB020531, optical observations
  7. GRB020531: optical observations
  8. GRB020531(=H2042): Optical Observations
  9. IPN triangulation of the short, hard GRB020531 (=H2042)
  10. GRB020531(=H2042): Optical Observations
  11. GRB020531: Optical observations
  12. GRB020531(=H2042): A Short, Hard Burst Localized by HETE
  13. GRB 020525: Optical Observations
  14. GRB020525, optical observations
  15. IPN detection of possible bursts from SGR1806-20
  16. IPN triangulation of GRB020525
  17. XRF 020427: Sudden Ionospheric Disturbance (SID)
  18. HETE Observations of GX354-0 (= MXB1728-34, so-called "Slow
  19. XRF020427: Chandra Identification of a Likely X-ray Counterpart
  20. IPN triangulation of a burst from SGR1806-20
  21. GRB/XRF 020427, Radio Observations
  22. HST detection of the likely host galaxy of GRB 020124
  23. GRB020405 field photometry at ESO
  24. XRF020427: Chandra Observations and Candidate X-ray Counterparts
  25. GRB(XRF) 020427: X-ray afterglow with BeppoSAX
  26. GRB020321 : Optical observations.
  27. GRB020427 BeppoSAX NFI Observation
  28. XRF 020427
  29. GRB020331: Third Epoch and Revised Second Epoch Optical
  30. The end of BSAX GRB activities
  31. GRB 020410, Radio Observations
  32. GRB 020418: Optical observations
  33. GRB 020124: Optical observations
  34. GRB 020418: Optical observations
  35. IPN triangulation of GRB020418
  36. GRB020405: VLT observations of the OT environment
  37. GRB020410: BeppoSAX NFI observations refined analysis
  38. GRB 020409: Optical Observations
  39. Mars Odyssey joins the IPN
  40. IPN triangulation of GRB020413
  41. GRB 020409, 2-nd epoch optical observations at Terskol.
  42. GRB020405: predicted break
  43. GRB 020409: Optical observations
  44. GRB 020409, No Optical Detection to R = 22
  45. GRB020410: second BeppoSAX NFI observation
  46. GRB 020409: No Evidence for an Optical Afterglow
  47. GRB 020331 Kyoto observation on March 31
  48. GRB 020409
  49. GRB 020409, No Optical Detection to R = 20
  50. April 11 BeppoSAX event (GRB020411) is likely not a GRB
  51. GRB 020410, optical observations
  52. GRB020406(?), optical observations
  53. GRB020410, optical observations
  54. BeppoSAX ALERT: possible GRB020410
  55. X-ray afterglow of GRB020321
  56. BeppoSAX GRB : GRB020409
  57. GRB020331: Confirmation of Afterglow Candidate with Magellan
  58. GRB020405: VLT optical observations and V band decay slope
  59. GRB020331 optical observations with RIMOTS
  60. GRB020124 optical observations with RIBOTS/RIMOTS
  61. GRB 020321: Candidate X-ray Counterparts
  62. ASM GRB candidate 020406 refined error box
  63. GRB 020405: Moderate-resolution spectroscopy
  64. GRB020331: Optical Observations of Afterglow Candidate
  65. GRB020406(?), optical observations
  66. GRB020405: VLT optical observations
  67. Revised Photometry of the Optical Afterglow of GRB 020405
  68. GRB020405: OT observations
  69. GRB 020331: Candidate Optical Afterglow
  70. GRB 020405: Decay index
  71. Short RXTE/ASM transient 020406; may be a GRB
  72. GRB020405, Radio Observations
  73. GRB020405: VLT spectroscopy
  74. Fading Optical Afterglow and Possible Host Galaxy of GRB 020405
  75. V band observations of GRB020405
  76. GRB 020405, U-band observations
  77. GRB 020405: Optical afterglow candidate
  78. IPN localization of GRB020405
  79. GRB011212: Optical Observations
  80. GRB 020331: NIR Observations
  81. GRB 020331: NIR Observations
  82. GRB020331 NIR observation at KPNO (re-submission)
  83. GRB02033 NIR observation at KPNO
  84. GRB020331 field photometry
  85. GRB 020331 Optical Observations
  86. GRB 020331, NIR observations
  87. GRB 020331: Optical observations
  88. GRB020331(=H1963): The "Easter" Burst Detected by HETE
  89. GRB 020321: Infrared observations
  90. GRB 020322: BeppoSAX observations of the X-ray afterglow
  91. SN 2002ap - peak brightness date (SN/GRB?)
  92. GRB011211: HST Observations of Optical Afterglow and Host Galaxy
  93. GRB 020322, Radio observations
  94. Near-Infrared Observations of GRB020322 at TIRGO
  95. GRB 020321, Radio Observations
  96. GRB 020322: Optical Observations
  97. GRB020127: Proposed Host Galaxy Detection and Identification of Afterglow
  98. GRB 020321: Optical observations
  99. GRB020317 BVRI field photometry
  100. GRB011211 revised BVRI field photometry

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