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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.

Advanced Search Examples (click to copy):

subject:"Swift"
body:"GRB"
submitter:"Judith Racusin"

19859 results found.

  1. GRB020604, optical observations
  2. GRB020604, BVRcIc field photometry
  3. GRB020603, BVRcIc field observations
  4. GRB020531, BVRcIc field photometry
  5. GRB020531 Optical Observations
  6. GRB020531: Observations with the Chandra X-ray Observatory
  7. IPN triangulation of GRB020603 (possible short/hard GRB)
  8. GRB020531, optical observations
  9. GRB020531: optical observations
  10. GRB020531(=H2042): Optical Observations
  11. GRB020531(=H2042): Optical Observations
  12. GRB020525, optical observations
  13. HETE Observations of GX354-0 (= MXB1728-34, so-called "Slow
  14. XRF020427: Chandra Identification of a Likely X-ray Counterpart
  15. GRB020405 field photometry at ESO
  16. GRB(XRF) 020427: X-ray afterglow with BeppoSAX
  17. GRB020321 : Optical observations.
  18. XRF 020427
  19. The end of BSAX GRB activities
  20. GRB 020410, Radio Observations
  21. GRB 020124: Optical observations
  22. IPN triangulation of GRB020418
  23. GRB020405: VLT observations of the OT environment
  24. IPN triangulation of GRB020413
  25. GRB 020409: No Evidence for an Optical Afterglow
  26. GRB 020331 Kyoto observation on March 31
  27. GRB 020409: Optical observations
  28. X-ray afterglow of GRB020321
  29. GRB020331 optical observations with RIMOTS
  30. GRB020124 optical observations with RIBOTS/RIMOTS
  31. GRB 020321: Candidate X-ray Counterparts
  32. GRB020406(?), optical observations
  33. GRB020405, Radio Observations
  34. GRB 020405, U-band observations
  35. GRB011212: Optical Observations
  36. GRB020331 NIR observation at KPNO (re-submission)
  37. GRB02033 NIR observation at KPNO
  38. GRB020331 field photometry
  39. GRB 020331, NIR observations
  40. GRB020331(=H1963): The "Easter" Burst Detected by HETE
  41. GRB 020322: BeppoSAX observations of the X-ray afterglow
  42. GRB011211: HST Observations of Optical Afterglow and Host Galaxy
  43. Near-Infrared Observations of GRB020322 at TIRGO
  44. GRB 020322: Optical Observations
  45. GRB020127: Proposed Host Galaxy Detection and Identification of Afterglow
  46. GRB 020321: Optical observations
  47. GRB020317 BVRI field photometry
  48. GRB011211 revised BVRI field photometry
  49. GRB020305 BVRI field photometry
  50. GRB020322 BVRI field photometry
  51. GRB020317 : Near IR Observations from Mt Abu Observatory
  52. GRB 020322: Optical Sources and Improved Astrometry
  53. GRB 011121: Fourth Epoch of HST Imaging
  54. GRB020317: optical observations
  55. GRB020321 optical observations
  56. GRB020321: a faint BeppoSAX detection
  57. GRB 020317 : KISO Optical Observations
  58. GRB 020305: Optical Observations
  59. GRB020317, optical observations
  60. GRB 020317: Optical observations
  61. GRB020305: Properties of the Candidate Optical Afterglow
  62. GRB 011121: HST Observations reveal an intermediate-time multicolor
  63. GRB011121, possible supernova association
  64. GRB011130 (XRF011130) Second Epoch Chandra Observations
  65. XRF/GRB 011030: Detection of the Probable Host Galaxy
  66. GRB020305, optical observations
  67. HST Imaging of the afterglow and host of GRB 011121
  68. GRB 010921: HST Observations
  69. IPN detection and localization of Cygnus X-1 flares
  70. SGR1900+14 activity
  71. IPN/HETE Detection of Bursts from SGR1900+14
  72. IPN Upper Limits to a GRB Associated With SN2002ap
  73. GRB020124 BVRI field photometry
  74. GRB020127: Palomar and VLA Observations of Possible Counterparts
  75. GRB020127: Comparison of Chandra Epochs and Identification of Possible Counterparts
  76. SN2002ap (SN/GRB?) Echelle spectra
  77. GRB020127 Optical Observations
  78. SN2002ap (SN/GRB?) UBVRI Field Photometry
  79. GRB020127: Chandra Observations and Prospective Counterparts
  80. pre-SN2002ap (SN/GRB?) imaging of M74
  81. GRB020124, optical observations
  82. GRB020127: Optical observations
  83. GRB 020127, I-band observations starting 3.14-hr after the event
  84. GRB010921 Optical Observations
  85. GRB020127(=H1902): Localization of a Double-Peaked GRB by HETE
  86. GRB020124: Optical observations
  87. GRB 020124: Optical observations
  88. Possible optical counterpart to a GRB
  89. GRB011212, Optical Observations
  90. Optical polarization observations for GRB011211
  91. GRB 011130 and GRB 011212 - Milagro GeV/TeV Observations
  92. GRB 011130: Optical Observations of X-ray and Radio Sources
  93. GRB 011130, Radio/X-ray Comparison
  94. GRB 011212: optical observation at Asiago
  95. GRB 011211: Evidence for an Optical Break
  96. GRB 011212: optical observation at Oslo (relayed)
  97. GRB 011211, Optical Observations
  98. GRB011212, BVRI field photometry
  99. GRB011211, BVRI field photometry
  100. Fading of the optical source associated of XRF 011211

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