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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"

43623 results found.

  1. IPN detection of possible bursts from SGR1806-20
  2. IPN triangulation of GRB020525
  3. XRF 020427: Sudden Ionospheric Disturbance (SID)
  4. HETE Observations of GX354-0 (= MXB1728-34, so-called "Slow
  5. XRF020427: Chandra Identification of a Likely X-ray Counterpart
  6. IPN triangulation of a burst from SGR1806-20
  7. GRB/XRF 020427, Radio Observations
  8. HST detection of the likely host galaxy of GRB 020124
  9. GRB020405 field photometry at ESO
  10. XRF020427: Chandra Observations and Candidate X-ray Counterparts
  11. GRB(XRF) 020427: X-ray afterglow with BeppoSAX
  12. GRB020321 : Optical observations.
  13. GRB020427 BeppoSAX NFI Observation
  14. XRF 020427
  15. GRB020331: Third Epoch and Revised Second Epoch Optical
  16. The end of BSAX GRB activities
  17. GRB 020410, Radio Observations
  18. GRB 020418: Optical observations
  19. GRB 020124: Optical observations
  20. GRB 020418: Optical observations
  21. IPN triangulation of GRB020418
  22. GRB020405: VLT observations of the OT environment
  23. GRB020410: BeppoSAX NFI observations refined analysis
  24. GRB 020409: Optical Observations
  25. Mars Odyssey joins the IPN
  26. IPN triangulation of GRB020413
  27. GRB 020409, 2-nd epoch optical observations at Terskol.
  28. GRB020405: predicted break
  29. GRB 020409: Optical observations
  30. GRB 020409, No Optical Detection to R = 22
  31. GRB020410: second BeppoSAX NFI observation
  32. GRB 020409: No Evidence for an Optical Afterglow
  33. GRB 020409, 2nd epoch optical observations
  34. GRB 020331 Kyoto observation on March 31
  35. GRB 020409
  36. GRB 020409 SARA Observations
  37. GRB "020411"
  38. GRB 020409, No Optical Detection to R = 20
  39. GRB020410: BeppoSAX NFI observation
  40. GRB 020409: Optical observations
  41. April 11 BeppoSAX event (GRB020411) is likely not a GRB
  42. GRB 020410, optical observations
  43. BeppoSAX ALERT: possible GRB020411
  44. GRB 020409, optical observations
  45. GRB 020409: Optical Observations
  46. GRB020406(?), optical observations
  47. GRB020410, optical observations
  48. BeppoSAX ALERT: possible GRB020410
  49. X-ray afterglow of GRB020321
  50. BeppoSAX GRB : GRB020409
  51. GRB020331: Confirmation of Afterglow Candidate with Magellan
  52. GRB020405: VLT optical observations and V band decay slope
  53. GRB020331 optical observations with RIMOTS
  54. GRB020124 optical observations with RIBOTS/RIMOTS
  55. GRB 020321: Candidate X-ray Counterparts
  56. ASM GRB candidate 020406 refined error box
  57. GRB 020405: Moderate-resolution spectroscopy
  58. GRB020331: Optical Observations of Afterglow Candidate
  59. GRB020406(?), optical observations
  60. GRB020405: VLT optical observations
  61. Revised Photometry of the Optical Afterglow of GRB 020405
  62. GRB020405: OT observations
  63. GRB 020331: Candidate Optical Afterglow
  64. GRB 020405: Decay index
  65. Short RXTE/ASM transient 020406; may be a GRB
  66. GRB020405, Radio Observations
  67. GRB020405: VLT spectroscopy
  68. Fading Optical Afterglow and Possible Host Galaxy of GRB 020405
  69. V band observations of GRB020405
  70. GRB 020405, U-band observations
  71. GRB 020405: Optical afterglow candidate
  72. IPN localization of GRB020405
  73. GRB011212: Optical Observations
  74. GRB 020331: NIR Observations
  75. GRB 020331: NIR Observations
  76. GRB020331 NIR observation at KPNO (re-submission)
  77. GRB02033 NIR observation at KPNO
  78. GRB020331 field photometry
  79. GRB 020331 Optical Observations
  80. GRB 020331, NIR observations
  81. GRB 020331: Optical observations
  82. GRB020331(=H1963): The "Easter" Burst Detected by HETE
  83. GRB 020321: Infrared observations
  84. GRB 020322: BeppoSAX observations of the X-ray afterglow
  85. SN 2002ap - peak brightness date (SN/GRB?)
  86. GRB011211: HST Observations of Optical Afterglow and Host Galaxy
  87. Near-Infrared Observations of GRB020322 at TIRGO
  88. GRB 020321, Radio Observations
  89. GRB 020322: Optical Observations
  90. GRB020127: Proposed Host Galaxy Detection and Identification of Afterglow
  91. GRB 020321: Optical observations
  92. GRB020317 BVRI field photometry
  93. GRB011211 revised BVRI field photometry
  94. GRB020305 BVRI field photometry
  95. GRB020322 BVRI field photometry
  96. GRB 020322 optical observations
  97. GRB 020322 optical observation
  98. GRB020317 : Near IR Observations from Mt Abu Observatory
  99. GRB 020322: Optical Sources and Improved Astrometry
  100. GRB020322, optical observations

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