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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"

42254 results found.

  1. GRB020531(=H2042): Optical Observations
  2. IPN triangulation of the short, hard GRB020531 (=H2042)
  3. GRB020531(=H2042): Optical Observations
  4. GRB020531: Optical observations
  5. GRB020531(=H2042): A Short, Hard Burst Localized by HETE
  6. GRB 020525: Optical Observations
  7. GRB020525, optical observations
  8. IPN detection of possible bursts from SGR1806-20
  9. HETE Observations of GX354-0 (= MXB1728-34, so-called "Slow
  10. XRF020427: Chandra Identification of a Likely X-ray Counterpart
  11. IPN triangulation of a burst from SGR1806-20
  12. GRB/XRF 020427, Radio Observations
  13. HST detection of the likely host galaxy of GRB 020124
  14. GRB020405 field photometry at ESO
  15. XRF020427: Chandra Observations and Candidate X-ray Counterparts
  16. GRB(XRF) 020427: X-ray afterglow with BeppoSAX
  17. GRB020321 : Optical observations.
  18. XRF 020427
  19. GRB020331: Third Epoch and Revised Second Epoch Optical
  20. The end of BSAX GRB activities
  21. GRB 020410, Radio Observations
  22. GRB 020418: Optical observations
  23. GRB 020124: Optical observations
  24. GRB 020418: Optical observations
  25. IPN triangulation of GRB020418
  26. GRB020405: VLT observations of the OT environment
  27. GRB020410: BeppoSAX NFI observations refined analysis
  28. GRB 020409: Optical Observations
  29. Mars Odyssey joins the IPN
  30. IPN triangulation of GRB020413
  31. GRB 020409, 2-nd epoch optical observations at Terskol.
  32. GRB020405: predicted break
  33. GRB 020409: Optical observations
  34. GRB 020409, No Optical Detection to R = 22
  35. GRB020410: second BeppoSAX NFI observation
  36. GRB 020409: No Evidence for an Optical Afterglow
  37. GRB 020409, 2nd epoch optical observations
  38. GRB 020331 Kyoto observation on March 31
  39. GRB 020409
  40. GRB 020409 SARA Observations
  41. GRB "020411"
  42. GRB 020409, No Optical Detection to R = 20
  43. GRB 020409: Optical observations
  44. April 11 BeppoSAX event (GRB020411) is likely not a GRB
  45. GRB 020410, optical observations
  46. GRB 020409, optical observations
  47. GRB 020409: Optical Observations
  48. GRB020406(?), optical observations
  49. GRB020410, optical observations
  50. X-ray afterglow of GRB020321
  51. BeppoSAX GRB : GRB020409
  52. GRB020331: Confirmation of Afterglow Candidate with Magellan
  53. GRB020405: VLT optical observations and V band decay slope
  54. GRB020331 optical observations with RIMOTS
  55. GRB020124 optical observations with RIBOTS/RIMOTS
  56. GRB 020321: Candidate X-ray Counterparts
  57. ASM GRB candidate 020406 refined error box
  58. GRB 020405: Moderate-resolution spectroscopy
  59. GRB020331: Optical Observations of Afterglow Candidate
  60. GRB020406(?), optical observations
  61. GRB020405: VLT optical observations
  62. Revised Photometry of the Optical Afterglow of GRB 020405
  63. GRB020405: OT observations
  64. GRB 020331: Candidate Optical Afterglow
  65. GRB 020405: Decay index
  66. Short RXTE/ASM transient 020406; may be a GRB
  67. GRB020405, Radio Observations
  68. GRB020405: VLT spectroscopy
  69. Fading Optical Afterglow and Possible Host Galaxy of GRB 020405
  70. V band observations of GRB020405
  71. GRB 020405, U-band observations
  72. GRB 020405: Optical afterglow candidate
  73. IPN localization of GRB020405
  74. GRB011212: Optical Observations
  75. GRB 020331: NIR Observations
  76. GRB 020331: NIR Observations
  77. GRB020331 NIR observation at KPNO (re-submission)
  78. GRB02033 NIR observation at KPNO
  79. GRB020331 field photometry
  80. GRB 020331 Optical Observations
  81. GRB 020331, NIR observations
  82. GRB 020331: Optical observations
  83. GRB020331(=H1963): The "Easter" Burst Detected by HETE
  84. GRB 020321: Infrared observations
  85. GRB 020322: BeppoSAX observations of the X-ray afterglow
  86. SN 2002ap - peak brightness date (SN/GRB?)
  87. GRB011211: HST Observations of Optical Afterglow and Host Galaxy
  88. GRB 020322, Radio observations
  89. Near-Infrared Observations of GRB020322 at TIRGO
  90. GRB 020321, Radio Observations
  91. GRB 020322: Optical Observations
  92. GRB020127: Proposed Host Galaxy Detection and Identification of Afterglow
  93. GRB 020321: Optical observations
  94. GRB020317 BVRI field photometry
  95. GRB011211 revised BVRI field photometry
  96. GRB020305 BVRI field photometry
  97. GRB020322 BVRI field photometry
  98. GRB 020322 optical observations
  99. GRB020322: Candidate Optical Afterglow
  100. GRB 020322 optical observation

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