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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"

19576 results found.

  1. GRB020604, optical observations
  2. GRB020604, BVRcIc field photometry
  3. GRB020603, BVRcIc field observations
  4. GRB020531, BVRcIc field photometry
  5. IPN triangulation of GRB020604
  6. GRB020531 Optical Observations
  7. GRB020531: Observations with the Chandra X-ray Observatory
  8. GRB020531, optical observations
  9. GRB020531: optical observations
  10. GRB020531(=H2042): Optical Observations
  11. GRB020531(=H2042): Optical Observations
  12. GRB020531(=H2042): A Short, Hard Burst Localized by HETE
  13. GRB020525, optical observations
  14. HETE Observations of GX354-0 (= MXB1728-34, so-called "Slow
  15. GRB020405 field photometry at ESO
  16. GRB(XRF) 020427: X-ray afterglow with BeppoSAX
  17. XRF 020427
  18. GRB 020410, Radio Observations
  19. GRB 020124: Optical observations
  20. GRB020405: VLT observations of the OT environment
  21. IPN triangulation of GRB020413
  22. GRB020405: predicted break
  23. GRB 020409: No Evidence for an Optical Afterglow
  24. GRB 020331 Kyoto observation on March 31
  25. X-ray afterglow of GRB020321
  26. GRB020331 optical observations with RIMOTS
  27. GRB020124 optical observations with RIBOTS/RIMOTS
  28. GRB020406(?), optical observations
  29. GRB020405, Radio Observations
  30. GRB 020405, U-band observations
  31. GRB020331 NIR observation at KPNO (re-submission)
  32. GRB02033 NIR observation at KPNO
  33. GRB020331 field photometry
  34. GRB 020331, NIR observations
  35. GRB020331(=H1963): The "Easter" Burst Detected by HETE
  36. GRB 020322: BeppoSAX observations of the X-ray afterglow
  37. GRB011211: HST Observations of Optical Afterglow and Host Galaxy
  38. Near-Infrared Observations of GRB020322 at TIRGO
  39. GRB 020322: Optical Observations
  40. GRB020127: Proposed Host Galaxy Detection and Identification of Afterglow
  41. GRB 020321: Optical observations
  42. GRB020317 BVRI field photometry
  43. GRB011211 revised BVRI field photometry
  44. GRB020305 BVRI field photometry
  45. GRB020322 BVRI field photometry
  46. GRB 020322: Optical Sources and Improved Astrometry
  47. GRB020317: optical observations
  48. GRB020321 optical observations
  49. GRB020321: a faint BeppoSAX detection
  50. GRB 020317 : KISO Optical Observations
  51. GRB020317 (=H1959): Localization by HETE of a Low Fluence GRB
  52. GRB 020305: Optical Observations
  53. GRB020317, optical observations
  54. GRB 020317: Optical observations
  55. GRB 011121: Third HST Epoch
  56. GRB020305: Properties of the Candidate Optical Afterglow
  57. GRB011130 (XRF011130) Second Epoch Chandra Observations
  58. XRF/GRB 011030: Detection of the Probable Host Galaxy
  59. GRB020305, optical observations
  60. GRB020305 (=H1939): Localization of a GRB by HETE
  61. HST Imaging of the afterglow and host of GRB 011121
  62. IPN detection and localization of Cygnus X-1 flares
  63. SGR1900+14 activity
  64. GRB020124 BVRI field photometry
  65. SN2002ap (SN/GRB?) optical spectrographic observations
  66. GRB020127 Optical Observations
  67. SN2002ap (SN/GRB?) UBVRI Field Photometry
  68. GRB020127: Chandra Observations and Prospective Counterparts
  69. pre-SN2002ap (SN/GRB?) imaging of M74
  70. GRB020124, optical observations
  71. GRB020127: Optical observations
  72. GRB 020127, I-band observations starting 3.14-hr after the event
  73. GRB010921 Optical Observations
  74. GRB020127(=H1902): Localization of a Double-Peaked GRB by HETE
  75. GRB020124: Optical observations
  76. GRB 020124: Optical observations
  77. GRB020124(=H1896): Localization of a Long GRB by HETE
  78. Possible optical counterpart to a GRB
  79. GRB011212, Optical Observations
  80. GRB011211: BeppoSAX/GRBM data
  81. Optical polarization observations for GRB011211
  82. GRB 011130: Optical Observations of X-ray and Radio Sources
  83. GRB 011212: optical observation at Asiago
  84. GRB 011211: Evidence for an Optical Break
  85. GRB 011212: optical observation at Oslo (relayed)
  86. GRB 011211: Optical Spectroscopy
  87. GRB 011211, Optical Observations
  88. GRB011212, BVRI field photometry
  89. GRB011211, BVRI field photometry
  90. GRB011212 (=H10001): An X-Ray Rich GRB Detected by HETE
  91. Fading of the optical source associated of XRF 011211
  92. GRB011130 (=XRF011130): Further analysis of Chandra Target of
  93. GRB011130 (XRF011130) Chandra Observations
  94. GRB011130 (=XRF011130): Scheduled Target of Opportunity
  95. GRB 011130, K band observations
  96. GRB011130 (XRF011130) SDSS PT i-band observations
  97. XRF011130: Infrared Observations
  98. GRB 011121: J-band observations
  99. GRB 011121: NIR observations, host galaxy?
  100. GRB011121: UBRI Observations

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