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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. IPN triangulation of GRB020413
  2. GRB 020409, 2-nd epoch optical observations at Terskol.
  3. GRB020405: predicted break
  4. GRB 020409: Optical observations
  5. GRB 020409, No Optical Detection to R = 22
  6. GRB020410: second BeppoSAX NFI observation
  7. GRB 020409: No Evidence for an Optical Afterglow
  8. GRB 020409, 2nd epoch optical observations
  9. GRB 020331 Kyoto observation on March 31
  10. GRB 020409
  11. GRB 020409 SARA Observations
  12. GRB "020411"
  13. GRB 020409, No Optical Detection to R = 20
  14. GRB020410: BeppoSAX NFI observation
  15. GRB 020409: Optical observations
  16. April 11 BeppoSAX event (GRB020411) is likely not a GRB
  17. GRB 020410, optical observations
  18. BeppoSAX ALERT: possible GRB020411
  19. GRB 020409, optical observations
  20. GRB 020409: Optical Observations
  21. GRB020406(?), optical observations
  22. GRB020410, optical observations
  23. BeppoSAX ALERT: possible GRB020410
  24. X-ray afterglow of GRB020321
  25. BeppoSAX GRB : GRB020409
  26. GRB020331: Confirmation of Afterglow Candidate with Magellan
  27. GRB020405: VLT optical observations and V band decay slope
  28. GRB020331 optical observations with RIMOTS
  29. GRB020124 optical observations with RIBOTS/RIMOTS
  30. GRB 020321: Candidate X-ray Counterparts
  31. ASM GRB candidate 020406 refined error box
  32. GRB 020405: Moderate-resolution spectroscopy
  33. GRB020331: Optical Observations of Afterglow Candidate
  34. GRB020406(?), optical observations
  35. GRB020405: VLT optical observations
  36. Revised Photometry of the Optical Afterglow of GRB 020405
  37. GRB020405: OT observations
  38. GRB 020331: Candidate Optical Afterglow
  39. GRB 020405: Decay index
  40. Short RXTE/ASM transient 020406; may be a GRB
  41. GRB020405, Radio Observations
  42. GRB020405: VLT spectroscopy
  43. Fading Optical Afterglow and Possible Host Galaxy of GRB 020405
  44. V band observations of GRB020405
  45. GRB 020405, U-band observations
  46. GRB 020405: Optical afterglow candidate
  47. IPN localization of GRB020405
  48. GRB011212: Optical Observations
  49. GRB 020331: NIR Observations
  50. GRB 020331: NIR Observations
  51. GRB020331 NIR observation at KPNO (re-submission)
  52. GRB02033 NIR observation at KPNO
  53. GRB020331 field photometry
  54. GRB 020331 Optical Observations
  55. GRB 020331, NIR observations
  56. GRB 020331: Optical observations
  57. GRB020331(=H1963): The "Easter" Burst Detected by HETE
  58. GRB 020321: Infrared observations
  59. GRB 020322: BeppoSAX observations of the X-ray afterglow
  60. SN 2002ap - peak brightness date (SN/GRB?)
  61. GRB011211: HST Observations of Optical Afterglow and Host Galaxy
  62. GRB 020322, Radio observations
  63. Near-Infrared Observations of GRB020322 at TIRGO
  64. GRB 020321, Radio Observations
  65. GRB 020322: Optical Observations
  66. GRB020127: Proposed Host Galaxy Detection and Identification of Afterglow
  67. GRB 020321: Optical observations
  68. GRB020317 BVRI field photometry
  69. GRB011211 revised BVRI field photometry
  70. GRB020305 BVRI field photometry
  71. GRB020322 BVRI field photometry
  72. GRB 020322 optical observations
  73. GRB020322: Candidate Optical Afterglow
  74. GRB 020322 optical observation
  75. GRB020317 : Near IR Observations from Mt Abu Observatory
  76. GRB 020322: Optical Sources and Improved Astrometry
  77. GRB020322, optical observations
  78. GRB 020322: Optical candidate
  79. XMM-Newton observation of GRB020322
  80. GRB020322: Optical Observations
  81. GRB020322: BeppoSAX/NFI Observations
  82. Bepposax GRB020322 The second springtime BSAX GRB
  83. GRB 020321: Optical observations
  84. GRB 011121: Fourth Epoch of HST Imaging
  85. GRB020317: optical observations
  86. GRB020321 optical observations
  87. GRB020321: BeppoSAX/NFI Observations
  88. GRB020321: a faint BeppoSAX detection
  89. GRB020305: NIR observations
  90. GRB 020317 : KISO Optical Observations
  91. BeppoSAX ALERT: GRB020321, the "Springtime Burst"
  92. GRB020317 (=H1959): Localization by HETE of a Low Fluence GRB
  93. GRB 020305: Optical Observations
  94. GRB020317, optical observations
  95. GRB 020317: Optical observations
  96. GRB 011121: Third HST Epoch
  97. GRB020305: Properties of the Candidate Optical Afterglow
  98. GRB 011121: HST Observations reveal an intermediate-time multicolor
  99. GRB011121, possible supernova association
  100. GRB011130 (XRF011130) Second Epoch Chandra Observations

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