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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"

35254 results found.

  1. GRB020331: Late-time Optical Light Curve
  2. GRB 020405: HST observations reveal red bump
  3. IPN triangulation of GRB020714
  4. IPN triangulation of GRB020715 (=GRB150702)
  5. IPN triangulation of GRB020714
  6. IPN triangulation of GRB150702
  7. GRB 020410: Discovery of Probable OT by HST
  8. GRB 020124, HST observations of the fading afterglow
  9. IPN triangulation of GRB020708
  10. IPN triangulation of GRB020708
  11. IPN error box for GRB020706
  12. IPN triangulation of GRB020706
  13. GRB 020705: Optical observations
  14. GRB 020625, optical observations
  15. GRB 020625: Optical observations
  16. GRB 020531: optical photometry of Chandra sources
  17. GRB020625 (=H2081): A Long Burst Localized by HETE
  18. The Probable Host Galaxy of GRB/XRF 020427
  19. GRB/XRF 020427, detection of an underlying system with the VLT
  20. GRB 020531, INT+WFC deep optical upper limits
  21. GRB020405: polarimetric observations
  22. GRB 020531, simultaneous optical observations
  23. GRB 020604, optical observations
  24. GRB 020531/Candidate Redshift
  25. GRB020531: Second epoch Chandra observations
  26. GRB020604, optical observations
  27. GRB020604, BVRcIc field photometry
  28. GRB020603, BVRcIc field observations
  29. GRB020531, BVRcIc field photometry
  30. GRB020531 Optical observations with TAROT
  31. GRB020531 Optical observations with TAROT
  32. GRB 020418, optical/near-IR observations
  33. GRB 020531, Radio Observations
  34. IPN triangulation of GRB020604
  35. GRB020531: Observations with the Chandra X-ray Observatory
  36. GRB 020603: Optical Observations
  37. GRB 020603, R-band observation
  38. Correction to IPN triangulation of GRB020603 (possible short/hard burst)
  39. GRB 020603: Optical observations
  40. IPN triangulation of GRB020603 (possible short/hard GRB)
  41. GRB 020531 optical observations with TAROT
  42. Refined IPN error box for GRB020531
  43. GRB020531, optical observations
  44. GRB020531(=H2042): Optical Observations
  45. IPN triangulation of the short, hard GRB020531 (=H2042)
  46. GRB020531(=H2042): Optical Observations
  47. GRB020531(=H2042): A Short, Hard Burst Localized by HETE
  48. GRB 020525: Optical Observations
  49. GRB020525, optical observations
  50. IPN detection of possible bursts from SGR1806-20
  51. IPN triangulation of GRB020525
  52. XRF020427: Chandra Identification of a Likely X-ray Counterpart
  53. IPN triangulation of a burst from SGR1806-20
  54. GRB/XRF 020427, Radio Observations
  55. HST detection of the likely host galaxy of GRB 020124
  56. XRF020427: Chandra Observations and Candidate X-ray Counterparts
  57. GRB(XRF) 020427: X-ray afterglow with BeppoSAX
  58. GRB020321 : Optical observations.
  59. GRB020427 BeppoSAX NFI Observation
  60. XRF 020427
  61. GRB020331: Third Epoch and Revised Second Epoch Optical
  62. The end of BSAX GRB activities
  63. GRB 020410, Radio Observations
  64. GRB 020418: Optical observations
  65. GRB 020124: Optical observations
  66. GRB 020418: Optical observations
  67. IPN triangulation of GRB020418
  68. GRB020405: VLT observations of the OT environment
  69. GRB020410: BeppoSAX NFI observations refined analysis
  70. GRB 020409: Optical Observations
  71. Mars Odyssey joins the IPN
  72. IPN triangulation of GRB020413
  73. GRB 020409, 2-nd epoch optical observations at Terskol.
  74. GRB 020409: Optical observations
  75. GRB 020409, No Optical Detection to R = 22
  76. GRB 020409: No Evidence for an Optical Afterglow
  77. GRB 020409, 2nd epoch optical observations
  78. GRB 020331 Kyoto observation on March 31
  79. GRB 020409
  80. GRB 020409 SARA Observations
  81. GRB "020411"
  82. GRB 020409, No Optical Detection to R = 20
  83. GRB020410: BeppoSAX NFI observation
  84. GRB 020409: Optical observations
  85. April 11 BeppoSAX event (GRB020411) is likely not a GRB
  86. GRB 020410, optical observations
  87. BeppoSAX ALERT: possible GRB020411
  88. GRB 020409, optical observations
  89. GRB 020409: Optical Observations
  90. GRB020406(?), optical observations
  91. GRB020410, optical observations
  92. BeppoSAX ALERT: possible GRB020410
  93. X-ray afterglow of GRB020321
  94. BeppoSAX GRB : GRB020409
  95. GRB020405: VLT optical observations and V band decay slope
  96. GRB020331 optical observations with RIMOTS
  97. GRB020124 optical observations with RIBOTS/RIMOTS
  98. GRB 020321: Candidate X-ray Counterparts
  99. ASM GRB candidate 020406 refined error box
  100. GRB 020405: Moderate-resolution spectroscopy

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