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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"

11755 results found.

  1. IPN triangulation of GRB031127A and B (quasi-simultaneous; large error boxes)
  2. GRB 031203: further analysis of INTEGRAL data
  3. GRB 031203: A long GRB detected with INTEGRAL
  4. IPN/HETE localization of GRB031109 (=H2917; large error box)
  5. IPN detection of activity from SGR1806-20
  6. IPN triangulation of GRB031107 (two large error boxes)
  7. HETE Prompt GRB Spectral Analyses
  8. XRF031109 (=H2919): A very long XRF localized by HETE
  9. Lulin optical follow-up observations of GRB031026
  10. GRB031026 (=H2882): A Long, Hard Spectrum Burst Localized by HETE
  11. IBAS alert 1180 refers to a burst from SGR 1806-20
  12. Ongoing Bursting Activity from SGR 1806-20 detected with IBAS
  13. SGR1806-20 bursts on 031008. Helicon detection and small error box.
  14. SGR 1806-20 bursts with INTEGRAL and IBAS announcement on Soft Gamma-Ray Repeaters
  15. IPN detection of continued activity from SGR1806-20
  16. A burst from SGR 1806-20 detected with IBAS
  17. IPN triangulation of GRB030922B (large error box)
  18. XRF030823 (=H2818): An X-Ray Flash Localized by the HETE WXM and SXC
  19. IPN triangulation of GRB030921 (large error box)
  20. IPN triangulation of GRB030919 (large error box)
  21. GRB 030913, optical candidate
  22. GRB030913: AAVSO optical observations
  23. GRB030913 (=H2849): TAROT Observations
  24. XRF030824: Optical observations
  25. IPN triangulation of GRB030903 (large error box)
  26. IBAS detection of bursts from SGR 1806-20
  27. Radio Observations of SGR1806-20
  28. IPN triangulation of GRB030831 (annulus)
  29. IPN triangulation of GRB030830 (large error box)
  30. INTEGRAL ToO OBSERVATIONS OF SGR1806-20: CALL FOR CORRELATED OBSERVATIONS
  31. Summary of recent IPN and HETE detections of SGR bursts
  32. Clarification of GCN 2354 on SGR1806-20
  33. IPN detection of continued activity from SGR1806-20
  34. 030813 SGR event (Konus-Wind observation)
  35. SGR 1808-20 (=H2802): A Possible new SGR
  36. IPN triangulation of GRB030806 (large burst; large error box)
  37. IPN/HETE summary of recent bursts from SGR1806-20
  38. GRB030725, optical transient observations
  39. GRB030723: Upper limits from historical observations
  40. GRB030725, possible optical transient
  41. XRF030723, BVRcIc field photometry correction
  42. XRF030723, ROTSE-III Early Observations
  43. Konus-Wind detection of the bursts from SGR1806-20 region
  44. SGR 1806-20, submm observations
  45. H2768, H2770, and H2771: Three Bursts from SGR1806-20
  46. IPN triangulation of GRB030717 (annulus)
  47. RXTE PCA Observations of SGR1806-20 Region
  48. Triangulation of GRB030715 (single large error box)
  49. IPN triangulation of GRB030714 (two large error boxes)
  50. IPN triangulation of GRB030715 (two large error boxes)
  51. IPN detection of renewed activity from SGR1806-20
  52. IPN triangulation of GRB030629 (annulus)
  53. GRB030329: second XMM-Newton observation
  54. GRB030418: R optical observations
  55. HETE detection of burst from SGR1806-20
  56. GRB030329 -- RATAN-600 data in April-May
  57. GRB030528(=H2724): X-ray Afterglow Identified in Second Epoch
  58. IPN triangulation of GRB030606 (two alternate error boxes)
  59. GRB 030528: tentative NIR counterpart
  60. GRB030528(=H2724): Observations with the Chandra X-ray Observatory
  61. IPN triangulation of GRB030601 (annulus)
  62. GRB030329, SPM optical observations
  63. GRB 030329: optical observations
  64. GRB 030329/SN 2003dh: Jitter Episode
  65. GRB 030329: optical photometry at various french observatories
  66. GRB030329, Optical observations
  67. GRB 030329/SN 2003dh: Possible increase in brightness
  68. GRB030329: XMM-Newton observation
  69. GRB030429, refiend optical brightness
  70. GRB 030329: Optical limit (contemporaneous photography)
  71. GRB030501C triangulation (annulus)
  72. GRB 030329 Optical Observations
  73. GRB 030329, BVRI photometry
  74. GRB030429: Optical Observations
  75. GRB 030501: TAROT possible candidate counterpart
  76. GRB030429, possible optical counterpart
  77. GRB 030429: ROTSE-III observations
  78. SNeIa AS THE POSSIBLE PROGENITORS OF SHORT-DURATION GRBs.
  79. GRB 030329, the review of the sky area in plate archive (1950-1998)
  80. GRB030329, optical observation
  81. MASTER:optical observations GRB030418
  82. MASTER:optical observations probable GRB030414
  83. ROTSE-III prompt optical detections of GRB 030418
  84. GRB030329: VR Photometry at TNG
  85. IPN triangulation of GRB030413 (small error box)
  86. IPN triangulation of GRB030406 (small error box)
  87. GRB030329: BV photographic observations
  88. GRB030329: RTT150 optical observations
  89. GRB030329: Kiso B and R band observations
  90. GRB 030329: BV photographic observations
  91. GRB 030329, BVRI photometry
  92. GRB030329: final R-band light curve by MASTER
  93. GRB030329 - more 15 GHz radio data
  94. OT GRB light curves and SN predictions
  95. GRB 030329, BRI photometry
  96. GRB030328: Full Observation, X-ray Fading and Spectrum Measured
  97. Further AAVSO V,B,R observations of GRB030329
  98. GRB 030329: Additional Mt. Laguna Optical Observations
  99. GRB030329: further optical photometry and evidence for a light curve discontinuity
  100. GRB030329 - OT rebrightens

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