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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').

10044 results found.

  1. GRB020813(=H2262): A Long, Bright Burst Localized by HETE in Near-Real Time
  2. GRB020812(=H2257): A Long Burst Localized by HETE in Near-Real Time
  3. GRB020801: Imaging of Suggested OT Counterpart at the Magellan
  4. GRB020801: Candidate OT present in DSS
  5. HST Imaging of the Host of GRB 011121
  6. Further refinement to IPN error box for GRB020531
  7. GRB020625 (=H2081): A Long Burst Localized by HETE
  8. GRB/XRF 020427, detection of an underlying system with the VLT
  9. AXP 1E2259+586 optical observations
  10. Fading Optical Source in the Field of GRB020531
  11. GRB020405: polarimetric observations
  12. GRB 020531/Candidate Redshift
  13. GRB020531: Second epoch Chandra observations
  14. GRB020531 Optical Observations
  15. GRB020531: Observations with the Chandra X-ray Observatory
  16. GRB020531: Upper Limit for Detection of Two TAROT Sources
  17. Refined IPN error box for GRB020531
  18. GRB020531(=H2042): Optical Observations
  19. IPN triangulation of the short, hard GRB020531 (=H2042)
  20. GRB020531(=H2042): Optical Observations
  21. GRB020531(=H2042): A Short, Hard Burst Localized by HETE
  22. HETE Observations of GX354-0 (= MXB1728-34, so-called "Slow
  23. GRB020405 field photometry at ESO
  24. GRB020331: Third Epoch and Revised Second Epoch Optical
  25. GRB020405: VLT observations of the OT environment
  26. GRB 020409: Optical Observations
  27. X-ray afterglow of GRB020321
  28. GRB020331: Confirmation of Afterglow Candidate with Magellan
  29. GRB020405: VLT optical observations and V band decay slope
  30. GRB020331 optical observations with RIMOTS
  31. GRB020124 optical observations with RIBOTS/RIMOTS
  32. GRB 020405: Moderate-resolution spectroscopy
  33. GRB020331: Optical Observations of Afterglow Candidate
  34. GRB020405: VLT optical observations
  35. GRB020405: VLT spectroscopy
  36. V band observations of GRB020405
  37. GRB011212: Optical Observations
  38. GRB020331(=H1963): The "Easter" Burst Detected by HETE
  39. Near-Infrared Observations of GRB020322 at TIRGO
  40. GRB 020322: Optical Sources and Improved Astrometry
  41. GRB 020322: Optical candidate
  42. XMM-Newton observation of GRB020322
  43. GRB 020317 : KISO Optical Observations
  44. GRB020317 (=H1959): Localization by HETE of a Low Fluence GRB
  45. GRB011130 (XRF011130) Second Epoch Chandra Observations
  46. GRB020305: Subaru Optical Observations
  47. IPN triangulation of GRB020305 (HETE 1939)
  48. GRB020305 (=H1939): Localization of a GRB by HETE
  49. IPN/HETE Detection of Bursts from SGR1900+14
  50. IPN Upper Limits to a GRB Associated With SN2002ap
  51. IPN triangulation of GRB020127 (=H1902)
  52. GRB020127(=H1902): Localization of a Double-Peaked GRB by HETE
  53. IPN triangulation of GRB020124 (HETE 1896)
  54. GRB020124(=H1896): Localization of a Long GRB by HETE
  55. GRB011212, Optical Observations
  56. Optical polarization observations for GRB011211
  57. Color indices of the afterglow of GRB011211
  58. GRB011212: Optical observations at Gunma
  59. GRB 011130: Optical Observations of X-ray and Radio Sources
  60. GRB 011211: TNG Spectroscopic Observations
  61. GRB011212 (=H10001): An X-Ray Rich GRB Detected by HETE
  62. XMM-Newton observation of GRB011211
  63. GRB011130 (=XRF011130): Further analysis of Chandra Target of
  64. GRB 011130: Optical Observations of Chandra Sources
  65. GRB 011130: Optical Observations of Chandra sources
  66. GRB011130 (XRF011130) Chandra Observations
  67. GRB011130 (=XRF011130): Scheduled Target of Opportunity
  68. GRB011130 (=XRF011130): Second Revised Localization by HETE
  69. GRB 011130 I-band Observation
  70. GRB011130 (=XRF011130): Revised Localization of an X-ray
  71. GRB 011121
  72. GRB011130 (=H1864): An X-Ray Rich GRB Detected by HETE
  73. GRB 011121: NIR observations, host galaxy?
  74. GRB 011030: TNG K-band observation
  75. XRF011030: J and K band observations
  76. GRB 011030: K-band observations
  77. GRB 011030 I-band Observation
  78. GRB011019: Subaru Optical Observations
  79. GRB 011030 I-band Observations
  80. GRB 011030 K-band Observations
  81. GRB010921, optical observations
  82. GRB011019: A Faint, X-ray Rich GRB localized by HETE
  83. GRB010928(=H1770): Localization of a Long GRB by HETE
  84. GRB010923(=H1764): A Short Duration GRB Detected by HETE
  85. GRB 010921 DPOSS Images Available
  86. IPN triangulation of GRB010921 (=H1761)
  87. H1761: A Bright GRB Detected by HETE
  88. Probable SGR or Short Duration GRB Detected by HETE
  89. BeppoSAX/GRBM detection of GRB010728
  90. GRB 010222 - WHT BVRI images
  91. GRB010629: Optical Observations
  92. SGR1900+14: High Fluence Burst Localized by HETE
  93. GRB010629: A Burst Localized by HETE
  94. SGR1900+14: Second Burst Localized by HETE
  95. SGR1900+14: A Burst Localized by HETE
  96. SGR1806-20: A Second, Intense Burst Localized by HETE
  97. SGR1806-20: Localization by HETE
  98. GRB010214, optical observations
  99. GRB Observation Report
  100. REVISED LOCATION OF GRB010326A

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