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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"

41686 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 Optical Observations
  11. GRB020531: Observations with the Chandra X-ray Observatory
  12. GRB 020603: Optical Observations
  13. GRB 020603, R-band observation
  14. Correction to IPN triangulation of GRB020603 (possible short/hard burst)
  15. GRB020531: Upper Limit for Detection of Two TAROT Sources
  16. GRB 020603: Optical observations
  17. IPN triangulation of GRB020603 (possible short/hard GRB)
  18. GRB 020531 optical observations with TAROT
  19. Refined IPN error box for GRB020531
  20. GRB020531, optical observations
  21. GRB020531: optical observations
  22. GRB020531, optical observation
  23. GRB020531(=H2042): Optical Observations
  24. IPN triangulation of the short, hard GRB020531 (=H2042)
  25. GRB020531(=H2042): Optical Observations
  26. GRB020531: Optical observations
  27. GRB020531(=H2042): A Short, Hard Burst Localized by HETE
  28. GRB 020525: Optical Observations
  29. GRB020525, optical observations
  30. IPN detection of possible bursts from SGR1806-20
  31. XRF 020427: Sudden Ionospheric Disturbance (SID)
  32. HETE Observations of GX354-0 (= MXB1728-34, so-called "Slow
  33. XRF020427: Chandra Identification of a Likely X-ray Counterpart
  34. IPN triangulation of a burst from SGR1806-20
  35. GRB/XRF 020427, Radio Observations
  36. HST detection of the likely host galaxy of GRB 020124
  37. GRB020405 field photometry at ESO
  38. XRF020427: Chandra Observations and Candidate X-ray Counterparts
  39. GRB(XRF) 020427: X-ray afterglow with BeppoSAX
  40. GRB020321 : Optical observations.
  41. GRB020427 BeppoSAX NFI Observation
  42. XRF 020427
  43. GRB020331: Third Epoch and Revised Second Epoch Optical
  44. The end of BSAX GRB activities
  45. GRB 020410, Radio Observations
  46. GRB 020418: Optical observations
  47. GRB 020124: Optical observations
  48. GRB 020418: Optical observations
  49. GRB020405: VLT observations of the OT environment
  50. GRB020410: BeppoSAX NFI observations refined analysis
  51. GRB 020409: Optical Observations
  52. Mars Odyssey joins the IPN
  53. GRB 020409, 2-nd epoch optical observations at Terskol.
  54. GRB020405: predicted break
  55. GRB 020409: Optical observations
  56. GRB 020409, No Optical Detection to R = 22
  57. GRB020410: second BeppoSAX NFI observation
  58. GRB 020409: No Evidence for an Optical Afterglow
  59. GRB 020409, 2nd epoch optical observations
  60. GRB 020331 Kyoto observation on March 31
  61. GRB 020409
  62. GRB 020409 SARA Observations
  63. GRB "020411"
  64. GRB 020409, No Optical Detection to R = 20
  65. GRB020410: BeppoSAX NFI observation
  66. GRB 020409: Optical observations
  67. GRB 020410, optical observations
  68. BeppoSAX ALERT: possible GRB020411
  69. GRB 020409, optical observations
  70. GRB 020409: Optical Observations
  71. GRB020406(?), optical observations
  72. BeppoSAX ALERT: possible GRB020410
  73. X-ray afterglow of GRB020321
  74. BeppoSAX GRB : GRB020409
  75. GRB020331: Confirmation of Afterglow Candidate with Magellan
  76. GRB020405: VLT optical observations and V band decay slope
  77. GRB020331 optical observations with RIMOTS
  78. GRB020124 optical observations with RIBOTS/RIMOTS
  79. GRB 020321: Candidate X-ray Counterparts
  80. ASM GRB candidate 020406 refined error box
  81. GRB 020405: Moderate-resolution spectroscopy
  82. GRB020331: Optical Observations of Afterglow Candidate
  83. GRB020406(?), optical observations
  84. GRB020405: VLT optical observations
  85. Revised Photometry of the Optical Afterglow of GRB 020405
  86. GRB020405: OT observations
  87. GRB 020331: Candidate Optical Afterglow
  88. GRB 020405: Decay index
  89. Short RXTE/ASM transient 020406; may be a GRB
  90. GRB020405, Radio Observations
  91. GRB020405: VLT spectroscopy
  92. Fading Optical Afterglow and Possible Host Galaxy of GRB 020405
  93. V band observations of GRB020405
  94. GRB 020405, U-band observations
  95. GRB 020405: Optical afterglow candidate
  96. IPN localization of GRB020405
  97. GRB011212: Optical Observations
  98. GRB 020331: NIR Observations
  99. GRB 020331: NIR Observations
  100. GRB020331 NIR observation at KPNO (re-submission)

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