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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"

12090 results found.

  1. IPN triangulation of GRB020911 (2 large error boxes)
  2. IPN detection of a burst from SGR1900+14
  3. INTEGRAL GRBs added to GCN
  4. GRB020812: optical observation
  5. Second epoch K band imaging of GRB 020819
  6. GRB 020812: early time optical observation at Ouda Station
  7. GRB020813: Magellan BVRI Photometry
  8. GRB 020819 : OT candidate - confirmation of non variability
  9. K band observation of GRB 020819
  10. GRB020819(=H2275): A Long Burst Localized by the HETE WXM and SXC
  11. IPN triangulation of GRB020819 (HETE 2275)
  12. GRB020813: Fading X-ray Afterglow Observed with Chandra
  13. GRB020812: NIR observations
  14. GRB020812: optical observations
  15. GRB 020812 : optical afterglow candidate
  16. GRB020813, optical observations
  17. GRB 020812 optical observation
  18. GRB020812(=H2257): A Long Burst Localized by HETE in Near-Real Time
  19. GRB020801: Imaging of Suggested OT Counterpart at the Magellan
  20. GRB020801, optical afterglow candidate
  21. IPN triangulation of GRB020714
  22. GRB 020410: Discovery of Probable OT by HST
  23. Correction to IPN error box for GRB020706
  24. IPN triangulation of GRB020706
  25. GRB 020705: Optical observations
  26. GRB020625 (=H2081): A Long Burst Localized by HETE
  27. Gemini IR Detection of AXP 1E 2259+586 Post-Burst
  28. SGR-like X-ray Bursts from AXP 1E 2259+586: follow-up
  29. AXP 1E2259+586: quasi-simultaneous optical observation
  30. AXP 1E2259+586 optical observations
  31. SGR-like Bursts from the AXP 1E 2259+586
  32. GRB 020531, simultaneous optical observations
  33. GRB020531: Second epoch Chandra observations
  34. GRB020531: Observations with the Chandra X-ray Observatory
  35. GRB020531, optical observation
  36. IPN triangulation of the short, hard GRB020531 (=H2042)
  37. GRB020525, optical observations
  38. IPN detection of possible bursts from SGR1806-20
  39. IPN triangulation of GRB020525
  40. XRF 020427: Sudden Ionospheric Disturbance (SID)
  41. HETE Observations of GX354-0 (= MXB1728-34, so-called "Slow
  42. IPN triangulation of a burst from SGR1806-20
  43. GRB 020410, Radio Observations
  44. GRB 020124: Optical observations
  45. IPN triangulation of GRB020418
  46. GRB020410: BeppoSAX NFI observations refined analysis
  47. Mars Odyssey joins the IPN
  48. IPN triangulation of GRB020413
  49. GRB 020409 SARA Observations
  50. GRB 020409, No Optical Detection to R = 20
  51. GRB020410: BeppoSAX NFI observation
  52. GRB 020409, optical observations
  53. GRB020406(?), optical observations
  54. BeppoSAX ALERT: possible GRB020410
  55. GRB020331 optical observations with RIMOTS
  56. GRB020124 optical observations with RIBOTS/RIMOTS
  57. GRB 020321: Candidate X-ray Counterparts
  58. GRB020406(?), optical observations
  59. GRB 020331, NIR observations
  60. GRB020331(=H1963): The "Easter" Burst Detected by HETE
  61. GRB 020321: Optical observations
  62. GRB020317: optical observations
  63. GRB 020317 : KISO Optical Observations
  64. BeppoSAX ALERT: GRB020321, the "Springtime Burst"
  65. GRB 020317: Optical observations
  66. GRB020305: Properties of the Candidate Optical Afterglow
  67. GRB011130 (XRF011130) Second Epoch Chandra Observations
  68. GRB020305, optical observations
  69. GRB 020305: Optical observations
  70. GRB 010921: HST Observations
  71. IPN detection and localization of Cygnus X-1 flares
  72. RXTE Observations of SGR 1900+14
  73. SGR1900+14 activity
  74. IPN/HETE Detection of Bursts from SGR1900+14
  75. IPN Upper Limits to a GRB Associated With SN2002ap
  76. SN2002ap (SN/GRB?) optical spectrographic observations
  77. IPN detection of further activity from SGR1806-20
  78. GRB020127(=H1902): Localization of a Double-Peaked GRB by HETE
  79. IPN observations of SGR1806-20
  80. GRB 020124: Optical afterglow
  81. Possible optical counterpart to a GRB
  82. GRB011212, Optical Observations
  83. GRB011212: Optical observations at Gunma
  84. GRB011212: Optical observations
  85. GRB011130 (=XRF011130): Further analysis of Chandra Target of
  86. GRB001109, Radio Monitoring
  87. GRB011121: fainter still
  88. GRB011121: fading behavior
  89. GRB 011030: TNG K-band observation
  90. XRF011030: Chandra Observations
  91. GRB 011030 I-band Observation
  92. The X-ray Flash 011030 ('GRB 011030')
  93. The Radio Afterglow from the X-ray Rich GRB 011030
  94. GRB 011019 optical observation
  95. Optical observation of SGR 1806-20 at the 6-m SAO telescope
  96. GRB011019: Subaru Optical Observations
  97. GRB 011030 K-band Observations
  98. GRB011019: ROTSE-III optical observations
  99. GRB010921: Spectroscopy of the Host Galaxy
  100. GRB010928(=H1770): Localization of a Long GRB by HETE

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