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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').
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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.

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subject:"Swift"
body:"GRB"
submitter:"Judith Racusin"

26295 results found.

  1. GRB020813: optical observation
  2. GRB020819(=H2275): Revised Localization with HETE Soft X-ray
  3. SGR1900+14 burst localized by HETE
  4. GRB020819: optical observations at Bisei
  5. GRB020812: negative optical observations
  6. GRB 020812: optical observation at Kyoto University
  7. Second epoch K band imaging of GRB 020819
  8. GRB020813, Baade 6.5m data now available
  9. GRB 020813 : HST observations
  10. Confirming no variability for GRB02081
  11. GRB020819 : Optical observations at KISO
  12. GRB 020812: early time optical observation at Ouda Station
  13. GRB020813: VRI Decay Slopes
  14. GRB020813: Magellan BVRI Photometry
  15. GRB 020819 : OT candidate - confirmation of non variability
  16. GRB020819: optical observations
  17. GRB020819(=H2275): A Long Burst Localized by the HETE WXM and SXC
  18. IPN triangulation of GRB020819 (HETE 2275)
  19. GRB020813: Fading X-ray Afterglow Observed with Chandra
  20. GRB 020813: addendum to GCN 1498
  21. GRB020813: V-band decay slope
  22. GRB020812: NIR observations
  23. Polarimetry of GRB020813: evidence for variability
  24. GRB020813 IRAM millimeter observations
  25. GRB020813: High-Resolution Optical Observations
  26. GRB 020812: optical observation at Bisei
  27. GRB020813: Early Time Magnitude
  28. GRB020813: optical observations; possible host galaxy
  29. GRB 020813, radio detection
  30. GRB 020812 : optical afterglow candidate
  31. GRB020813, optical observations
  32. Millimeter observation of GRB 020813
  33. GRB020812: optical observations
  34. GRB020813, optical observations
  35. IPN error box for GRB020813
  36. IPN triangulation of GRB020813
  37. Early Time Limits for GRB020813
  38. GRB020813, astrometric position
  39. GRB 020813 Afterglow Observations; Possible break
  40. GRB 020813 multiband optical observations
  41. GRB020813: optical afterglow
  42. GRB020813: Fading of Candidate OT
  43. GRB020813(=H2262): A Long, Bright Burst Localized by HETE in Near-Real Time
  44. GRB020812(=H2257): A Long Burst Localized by HETE in Near-Real Time
  45. GRB020801: Imaging of Suggested OT Counterpart at the Magellan
  46. GRB020801: Candidate OT present in DSS
  47. GRB020331: Late-time Optical Light Curve (re-submission)
  48. GRB020331: Late-time Optical Light Curve
  49. GRB 020405: HST observations reveal red bump
  50. IPN triangulation of GRB020715 (=GRB150702)
  51. IPN triangulation of GRB020714
  52. IPN triangulation of GRB150702
  53. GRB 020410: Discovery of Probable OT by HST
  54. IPN triangulation of GRB020708
  55. IPN triangulation of GRB020708
  56. IPN triangulation of GRB020706
  57. GRB 020625, optical observations
  58. GRB 020531: optical photometry of Chandra sources
  59. GRB020625 (=H2081): A Long Burst Localized by HETE
  60. The Probable Host Galaxy of GRB/XRF 020427
  61. GRB/XRF 020427, detection of an underlying system with the VLT
  62. SGR-like X-ray Bursts from AXP 1E 2259+586: follow-up
  63. AXP 1E2259+586: quasi-simultaneous optical observation
  64. AXP 1E2259+586 optical observations
  65. Fading Optical Source in the Field of GRB020531
  66. GRB 020531, INT+WFC deep optical upper limits
  67. GRB 020531, simultaneous optical observations
  68. GRB020531: Second epoch Chandra observations
  69. GRB020531 Optical observations with TAROT
  70. GRB020531 Optical observations with TAROT
  71. GRB 020531, Radio Observations
  72. IPN triangulation of GRB020604
  73. GRB020531: Observations with the Chandra X-ray Observatory
  74. Correction to IPN triangulation of GRB020603 (possible short/hard burst)
  75. GRB020531: Upper Limit for Detection of Two TAROT Sources
  76. IPN triangulation of GRB020603 (possible short/hard GRB)
  77. IPN triangulation of the short, hard GRB020531 (=H2042)
  78. GRB020531(=H2042): A Short, Hard Burst Localized by HETE
  79. IPN detection of possible bursts from SGR1806-20
  80. IPN triangulation of GRB020525
  81. XRF 020427: Sudden Ionospheric Disturbance (SID)
  82. HETE Observations of GX354-0 (= MXB1728-34, so-called "Slow
  83. GRB/XRF 020427, Radio Observations
  84. GRB(XRF) 020427: X-ray afterglow with BeppoSAX
  85. GRB020321 : Optical observations.
  86. GRB020331: Third Epoch and Revised Second Epoch Optical
  87. The end of BSAX GRB activities
  88. GRB 020410, Radio Observations
  89. GRB 020124: Optical observations
  90. IPN triangulation of GRB020418
  91. GRB020405: VLT observations of the OT environment
  92. Mars Odyssey joins the IPN
  93. IPN triangulation of GRB020413
  94. GRB 020409, 2-nd epoch optical observations at Terskol.
  95. GRB020405: predicted break
  96. GRB 020409, No Optical Detection to R = 22
  97. GRB 020409, 2nd epoch optical observations
  98. GRB 020331 Kyoto observation on March 31
  99. GRB 020409, No Optical Detection to R = 20
  100. X-ray afterglow of GRB020321

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