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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"

10364 results found.

  1. GRB 031220: Optical observation at Tokyo Tech
  2. GRB031220: ROTSE-IIIb Optical Limits
  3. GRB031220 : Optical Observation of Lulin Observatory
  4. GRB 2974 follow-up observations
  5. GRB 021203: A Normal GRB viewed far off axis?
  6. GRB 031203: Variable Radio Source
  7. GRB 031203: Optical/IR Astrometry
  8. GRB 031203: Deep NIR NTT & VLT observations
  9. GRB 031203: Radio detection
  10. IPN triangulation of GRB031127A and B (quasi-simultaneous; large error boxes)
  11. GRB 031203: further analysis of INTEGRAL data
  12. GRB 031203: A long GRB detected with INTEGRAL
  13. IPN/HETE localization of GRB031109 (=H2917; large error box)
  14. IPN detection of activity from SGR1806-20
  15. IPN triangulation of GRB031107 (two large error boxes)
  16. HETE Prompt GRB Spectral Analyses
  17. XRF031109 (=H2919): A very long XRF localized by HETE
  18. Lulin optical follow-up observations of GRB031026
  19. GRB031026 (=H2882): A Long, Hard Spectrum Burst Localized by HETE
  20. IBAS alert 1180 refers to a burst from SGR 1806-20
  21. Ongoing Bursting Activity from SGR 1806-20 detected with IBAS
  22. SGR1806-20 bursts on 031008. Helicon detection and small error box.
  23. SGR 1806-20 bursts with INTEGRAL and IBAS announcement on Soft Gamma-Ray Repeaters
  24. IPN detection of continued activity from SGR1806-20
  25. A burst from SGR 1806-20 detected with IBAS
  26. IPN triangulation of GRB030922B (large error box)
  27. XRF030823 (=H2818): An X-Ray Flash Localized by the HETE WXM and SXC
  28. IPN triangulation of GRB030921 (large error box)
  29. IPN triangulation of GRB030919 (large error box)
  30. GRB 030913, optical candidate
  31. GRB030913: AAVSO optical observations
  32. GRB030913 (=H2849): TAROT Observations
  33. XRF030824: Optical observations
  34. IPN triangulation of GRB030903 (large error box)
  35. IBAS detection of bursts from SGR 1806-20
  36. Radio Observations of SGR1806-20
  37. IPN triangulation of GRB030831 (annulus)
  38. IPN triangulation of GRB030830 (large error box)
  39. INTEGRAL ToO OBSERVATIONS OF SGR1806-20: CALL FOR CORRELATED OBSERVATIONS
  40. Summary of recent IPN and HETE detections of SGR bursts
  41. Clarification of GCN 2354 on SGR1806-20
  42. IPN detection of continued activity from SGR1806-20
  43. 030813 SGR event (Konus-Wind observation)
  44. SGR 1808-20 (=H2802): A Possible new SGR
  45. IPN triangulation of GRB030806 (large burst; large error box)
  46. IPN/HETE summary of recent bursts from SGR1806-20
  47. GRB030725, optical transient observations
  48. GRB030723: Upper limits from historical observations
  49. GRB030725, possible optical transient
  50. XRF030723, BVRcIc field photometry correction
  51. XRF030723, ROTSE-III Early Observations
  52. Konus-Wind detection of the bursts from SGR1806-20 region
  53. SGR 1806-20, submm observations
  54. H2768, H2770, and H2771: Three Bursts from SGR1806-20
  55. IPN triangulation of GRB030717 (annulus)
  56. RXTE PCA Observations of SGR1806-20 Region
  57. Triangulation of GRB030715 (single large error box)
  58. IPN triangulation of GRB030714 (two large error boxes)
  59. IPN triangulation of GRB030715 (two large error boxes)
  60. IPN detection of renewed activity from SGR1806-20
  61. IPN triangulation of GRB030629 (annulus)
  62. GRB030329: second XMM-Newton observation
  63. GRB030418: R optical observations
  64. HETE detection of burst from SGR1806-20
  65. GRB030329 -- RATAN-600 data in April-May
  66. GRB030528(=H2724): X-ray Afterglow Identified in Second Epoch
  67. IPN triangulation of GRB030606 (two alternate error boxes)
  68. GRB 030528: tentative NIR counterpart
  69. GRB030528(=H2724): Observations with the Chandra X-ray Observatory
  70. IPN triangulation of GRB030601 (annulus)
  71. GRB030329, SPM optical observations
  72. GRB 030329: optical observations
  73. GRB 030329/SN 2003dh: Jitter Episode
  74. GRB 030329: optical photometry at various french observatories
  75. GRB030329, Optical observations
  76. GRB 030329/SN 2003dh: Possible increase in brightness
  77. GRB030329: XMM-Newton observation
  78. GRB030429, refiend optical brightness
  79. GRB 030329: Optical limit (contemporaneous photography)
  80. GRB030501C triangulation (annulus)
  81. GRB 030329 Optical Observations
  82. GRB 030329, BVRI photometry
  83. GRB030429: Optical Observations
  84. GRB 030501: TAROT possible candidate counterpart
  85. GRB030429, possible optical counterpart
  86. GRB 030429: ROTSE-III observations
  87. SNeIa AS THE POSSIBLE PROGENITORS OF SHORT-DURATION GRBs.
  88. GRB 030329, the review of the sky area in plate archive (1950-1998)
  89. GRB030329, optical observation
  90. MASTER:optical observations GRB030418
  91. MASTER:optical observations probable GRB030414
  92. ROTSE-III prompt optical detections of GRB 030418
  93. GRB030329: VR Photometry at TNG
  94. IPN triangulation of GRB030413 (small error box)
  95. IPN triangulation of GRB030406 (small error box)
  96. GRB030329: BV photographic observations
  97. GRB030329: RTT150 optical observations
  98. GRB030329: Kiso B and R band observations
  99. GRB 030329: BV photographic observations
  100. GRB 030329, BVRI photometry

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