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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').
  1. GRB 020418: Optical observations
  2. GRB 020124: Optical observations
  3. GRB 020418: Optical observations
  4. IPN triangulation of GRB020418
  5. GRB020405: VLT observations of the OT environment
  6. GRB020410: BeppoSAX NFI observations refined analysis
  7. GRB 020409: Optical Observations
  8. Mars Odyssey joins the IPN
  9. IPN triangulation of GRB020413
  10. GRB 020409, 2-nd epoch optical observations at Terskol.
  11. GRB020405: predicted break
  12. GRB 020409: Optical observations
  13. GRB 020409, No Optical Detection to R = 22
  14. GRB020410: second BeppoSAX NFI observation
  15. GRB 020409: No Evidence for an Optical Afterglow
  16. GRB 020409, 2nd epoch optical observations
  17. GRB 020331 Kyoto observation on March 31
  18. GRB 020409
  19. GRB 020409 SARA Observations
  20. GRB "020411"
  21. GRB 020409, No Optical Detection to R = 20
  22. GRB020410: BeppoSAX NFI observation
  23. GRB 020409: Optical observations
  24. April 11 BeppoSAX event (GRB020411) is likely not a GRB
  25. GRB 020410, optical observations
  26. BeppoSAX ALERT: possible GRB020411
  27. GRB 020409, optical observations
  28. GRB 020409: Optical Observations
  29. GRB020406(?), optical observations
  30. GRB020410, optical observations
  31. BeppoSAX ALERT: possible GRB020410
  32. X-ray afterglow of GRB020321
  33. BeppoSAX GRB : GRB020409
  34. GRB020331: Confirmation of Afterglow Candidate with Magellan
  35. GRB020405: VLT optical observations and V band decay slope
  36. GRB020331 optical observations with RIMOTS
  37. GRB020124 optical observations with RIBOTS/RIMOTS
  38. GRB 020321: Candidate X-ray Counterparts
  39. ASM GRB candidate 020406 refined error box
  40. GRB 020405: Moderate-resolution spectroscopy
  41. GRB020331: Optical Observations of Afterglow Candidate
  42. GRB020406(?), optical observations
  43. GRB020405: VLT optical observations
  44. Revised Photometry of the Optical Afterglow of GRB 020405
  45. GRB020405: OT observations
  46. GRB 020331: Candidate Optical Afterglow
  47. GRB 020405: Decay index
  48. Short RXTE/ASM transient 020406; may be a GRB
  49. GRB020405, Radio Observations
  50. GRB020405: VLT spectroscopy
  51. Fading Optical Afterglow and Possible Host Galaxy of GRB 020405
  52. V band observations of GRB020405
  53. GRB 020405, U-band observations
  54. GRB 020405: Optical afterglow candidate
  55. IPN localization of GRB020405
  56. GRB011212: Optical Observations
  57. GRB 020331: NIR Observations
  58. GRB 020331: NIR Observations
  59. GRB020331 NIR observation at KPNO (re-submission)
  60. GRB02033 NIR observation at KPNO
  61. GRB020331 field photometry
  62. GRB 020331 Optical Observations
  63. GRB 020331, NIR observations
  64. GRB 020331: Optical observations
  65. GRB020331(=H1963): The "Easter" Burst Detected by HETE
  66. GRB 020321: Infrared observations
  67. GRB 020322: BeppoSAX observations of the X-ray afterglow
  68. SN 2002ap - peak brightness date (SN/GRB?)
  69. GRB011211: HST Observations of Optical Afterglow and Host Galaxy
  70. GRB 020322, Radio observations
  71. Near-Infrared Observations of GRB020322 at TIRGO
  72. GRB 020321, Radio Observations
  73. GRB 020322: Optical Observations
  74. GRB020127: Proposed Host Galaxy Detection and Identification of Afterglow
  75. GRB 020321: Optical observations
  76. GRB020317 BVRI field photometry
  77. GRB011211 revised BVRI field photometry
  78. GRB020305 BVRI field photometry
  79. GRB020322 BVRI field photometry
  80. GRB 020322 optical observations
  81. GRB020322: Candidate Optical Afterglow
  82. GRB 020322 optical observation
  83. GRB020317 : Near IR Observations from Mt Abu Observatory
  84. GRB 020322: Optical Sources and Improved Astrometry
  85. GRB020322, optical observations
  86. GRB 020322: Optical candidate
  87. XMM-Newton observation of GRB020322
  88. GRB020322: Optical Observations
  89. GRB020322: BeppoSAX/NFI Observations
  90. Bepposax GRB020322 The second springtime BSAX GRB
  91. GRB 020321: Optical observations
  92. GRB 011121: Fourth Epoch of HST Imaging
  93. GRB020317: optical observations
  94. GRB020321 optical observations
  95. GRB020321: BeppoSAX/NFI Observations
  96. GRB020321: a faint BeppoSAX detection
  97. GRB020305: NIR observations
  98. GRB 020317 : KISO Optical Observations
  99. BeppoSAX ALERT: GRB020321, the "Springtime Burst"
  100. GRB020317 (=H1959): Localization by HETE of a Low Fluence GRB

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