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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"

35433 results found.

  1. GRB020604, optical observations
  2. GRB020604, BVRcIc field photometry
  3. GRB020603, BVRcIc field observations
  4. GRB020531, BVRcIc field photometry
  5. GRB020531 Optical observations with TAROT
  6. GRB020531 Optical observations with TAROT
  7. GRB 020418, optical/near-IR observations
  8. GRB 020531, Radio Observations
  9. IPN triangulation of GRB020604
  10. GRB020531: Observations with the Chandra X-ray Observatory
  11. GRB 020603: Optical Observations
  12. GRB 020603, R-band observation
  13. Correction to IPN triangulation of GRB020603 (possible short/hard burst)
  14. GRB 020603: Optical observations
  15. IPN triangulation of GRB020603 (possible short/hard GRB)
  16. GRB 020531 optical observations with TAROT
  17. Refined IPN error box for GRB020531
  18. GRB020531, optical observations
  19. GRB020531(=H2042): Optical Observations
  20. IPN triangulation of the short, hard GRB020531 (=H2042)
  21. GRB020531(=H2042): Optical Observations
  22. GRB020531(=H2042): A Short, Hard Burst Localized by HETE
  23. GRB 020525: Optical Observations
  24. GRB020525, optical observations
  25. IPN detection of possible bursts from SGR1806-20
  26. IPN triangulation of GRB020525
  27. XRF020427: Chandra Identification of a Likely X-ray Counterpart
  28. IPN triangulation of a burst from SGR1806-20
  29. GRB/XRF 020427, Radio Observations
  30. HST detection of the likely host galaxy of GRB 020124
  31. XRF020427: Chandra Observations and Candidate X-ray Counterparts
  32. GRB(XRF) 020427: X-ray afterglow with BeppoSAX
  33. GRB020321 : Optical observations.
  34. GRB020427 BeppoSAX NFI Observation
  35. XRF 020427
  36. GRB020331: Third Epoch and Revised Second Epoch Optical
  37. The end of BSAX GRB activities
  38. GRB 020410, Radio Observations
  39. GRB 020418: Optical observations
  40. GRB 020124: Optical observations
  41. GRB 020418: Optical observations
  42. IPN triangulation of GRB020418
  43. GRB020405: VLT observations of the OT environment
  44. GRB020410: BeppoSAX NFI observations refined analysis
  45. GRB 020409: Optical Observations
  46. Mars Odyssey joins the IPN
  47. IPN triangulation of GRB020413
  48. GRB 020409, 2-nd epoch optical observations at Terskol.
  49. GRB 020409: Optical observations
  50. GRB 020409, No Optical Detection to R = 22
  51. GRB 020409: No Evidence for an Optical Afterglow
  52. GRB 020409, 2nd epoch optical observations
  53. GRB 020331 Kyoto observation on March 31
  54. GRB 020409
  55. GRB 020409 SARA Observations
  56. GRB "020411"
  57. GRB 020409, No Optical Detection to R = 20
  58. GRB020410: BeppoSAX NFI observation
  59. GRB 020409: Optical observations
  60. April 11 BeppoSAX event (GRB020411) is likely not a GRB
  61. GRB 020410, optical observations
  62. BeppoSAX ALERT: possible GRB020411
  63. GRB 020409, optical observations
  64. GRB 020409: Optical Observations
  65. GRB020406(?), optical observations
  66. GRB020410, optical observations
  67. BeppoSAX ALERT: possible GRB020410
  68. X-ray afterglow of GRB020321
  69. BeppoSAX GRB : GRB020409
  70. GRB020405: VLT optical observations and V band decay slope
  71. GRB020331 optical observations with RIMOTS
  72. GRB020124 optical observations with RIBOTS/RIMOTS
  73. GRB 020321: Candidate X-ray Counterparts
  74. ASM GRB candidate 020406 refined error box
  75. GRB 020405: Moderate-resolution spectroscopy
  76. GRB020406(?), optical observations
  77. GRB020405: VLT optical observations
  78. Revised Photometry of the Optical Afterglow of GRB 020405
  79. GRB020405: OT observations
  80. GRB 020331: Candidate Optical Afterglow
  81. GRB 020405: Decay index
  82. Short RXTE/ASM transient 020406; may be a GRB
  83. GRB020405, Radio Observations
  84. Fading Optical Afterglow and Possible Host Galaxy of GRB 020405
  85. GRB 020405, U-band observations
  86. GRB 020405: Optical afterglow candidate
  87. IPN localization of GRB020405
  88. GRB011212: Optical Observations
  89. GRB 020331: NIR Observations
  90. GRB 020331: NIR Observations
  91. GRB020331 NIR observation at KPNO (re-submission)
  92. GRB02033 NIR observation at KPNO
  93. GRB020331 field photometry
  94. GRB 020331 Optical Observations
  95. GRB 020331, NIR observations
  96. GRB 020331: Optical observations
  97. GRB020331(=H1963): The "Easter" Burst Detected by HETE
  98. GRB 020321: Infrared observations
  99. GRB 020322: BeppoSAX observations of the X-ray afterglow
  100. SN 2002ap - peak brightness date (SN/GRB?)

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