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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"

24365 results found.

  1. GRB 040422: a long GRB detected with INTEGRAL
  2. MASTER: HETE Alert 3163, 3167 technical optical observation
  3. INTEGRAL-SPI/ACS GRB data: timing correction
  4. IBAS GRB alerts 1739, 1740, 1741
  5. HETE/IPN localization of GRB040403A (=H3143, a long burst) and GRB040403B(=H3144, a short/hard burst)
  6. GRB 040403: Optical Observations
  7. GRB 040403: Optical observations
  8. GRB 040403: a long GRB detected with INTEGRAL
  9. Summary of recent bursts from SGR 1806-20 detected by INTEGRAL
  10. IBAS GRB Alert 1694
  11. GRB040323: NIR Observations and Variable Object
  12. GRB 040319 (=H3128): An X-Ray-Rich GRB Localized by the HETE-2 WXM and SXC
  13. GRB 040323, a dark GRB ?
  14. GRB 040323: a long GRB detected with INTEGRAL
  15. IBAS GRB alerts 1679, 1680, 1681
  16. IBAS Alert 1678: not a GRB
  17. GRB 031203: spectoscopic evidence for a 1998bw-like SN
  18. GRB 031203, possible supernova
  19. IBAS results on a burst from SGR1806-20
  20. INTEGRAL detection of activity from SGR1806-20
  21. RXTE GRB040229 optical observation: no candidate
  22. GRB 040228 Optical observations
  23. GRB 040228 (=H3066?,=H3067?): A Long GRB Localized by the HETE-2 WXM
  24. GRB 040223: further offline analysis
  25. GRB 040223: a long GRB detected with INTEGRAL
  26. GRB031111, optical observations
  27. GRB031220: 2nd Chandra observation and X-ray afterglow candidate
  28. Follow-up on IBAS GRB Alert 1379
  29. IBAS GRB alert 1379
  30. SN 2003dh/GRB030329 late-time optical spectroscopy
  31. GRB040106: Second Epoch Optical Observations
  32. GRB040106: optical observations with REM+ROSS
  33. GRB031220: observation at Univercity of Miyazaki
  34. GRB 040106 : peak flux
  35. GRB 040106 : a long GRB detected with INTEGRAL
  36. GRB031220(=H2976): TNG R-band Observation of the Chandra X-ray Sources
  37. IPN triangulation of GRB031219 (large error box)
  38. GRB031220: Palomar Observations
  39. GRB 031220: Optical observation at Tokyo Tech
  40. GRB031220: ROTSE-IIIb Optical Limits
  41. GRB 031203: SMARTS optical monitoring
  42. GRB 031203: Optical/IR Astrometry
  43. IPN/HETE localization of GRB031203B (=H2949; large error box)
  44. GRB031203: ROSAT upper limits suggest XMM-S1 source as the transient
  45. XMM-Newton Observation of GRB031203
  46. XMM-Newton Observation of GRB031203
  47. GRB 031203: Radio detection
  48. GRB031203 : Optical Observation of Lulin Observatory
  49. GRB 031203: Apparent Spectral Break
  50. GRB031203: Planned XMM-Newton observation II
  51. GRB 031203: Optical/IR SMARTS Observations
  52. IPN triangulation of GRB031127A and B (quasi-simultaneous; large error boxes)
  53. GRB 031203: further analysis of INTEGRAL data
  54. GRB 031203: A long GRB detected with INTEGRAL
  55. IPN triangulation of GRB031201 (large error box)
  56. IPN triangulation of GRB031130 (large error box)
  57. GRB031111A, prompt optical observations
  58. IPN triangulation of GRB031120 (two large error boxes)
  59. IPN/HETE localization of GRB031109 (=H2917; large error box)
  60. IPN triangulation of GRB031107 (two large error boxes)
  61. GRB 031111, optical observations
  62. HETE Prompt GRB Spectral Analyses
  63. XRF031109 (=H2919): A very long XRF localized by HETE
  64. GRB031026: 1.2mm upper limit with MAMBO at the IRAM 30m
  65. GRB030929/SN2003jd association unlikely based on IPN localiztion
  66. Lulin optical follow-up observations of GRB031026
  67. SN 2003jd (SN/GRB?) - possible association with GRB 030929
  68. GRB 031026: Further Ic Observations
  69. GRB 031026 (=H2882): Evidence for High Redshift from Prompt
  70. IPN triangulation of GRB031024 (single error box)
  71. GRB031026 (=H2882): A Long, Hard Spectrum Burst Localized by HETE
  72. GRB 031026: Ic Observations
  73. IPN triangulation of GRB031024 (annulus)
  74. IBAS alert 1180 refers to a burst from SGR 1806-20
  75. HETE Prompt GRB Light Curves and Color-Color Diagrams
  76. Ongoing Bursting Activity from SGR 1806-20 detected with IBAS
  77. SGR 1806-20 bursts with INTEGRAL and IBAS announcement on Soft Gamma-Ray Repeaters
  78. IPN detection of continued activity from SGR1806-20
  79. IPN triangulation of GRB031007 (two large error boxes)
  80. A burst from SGR 1806-20 detected with IBAS
  81. XRF030824 (=H2821): An X-Ray Flash Localized by the HETE WXM
  82. XRF030823 (=H2818): An X-Ray Flash Localized by the HETE WXM and SXC
  83. GRB030922 triangulation (annulus)
  84. GRB030913: OT's limit by MASTER
  85. GRB030913, candidate afterglow observations
  86. GRB030913 (=H2849): Confirmation of the Flight Localization
  87. GRB030913: wide field imaging (7 sq.deg) of the error box by MASTER
  88. Magellan Observations of GRB030725 (=H2779)
  89. GRB030913 (=H2849): A GRB Possibly Localized by HETE
  90. XRF 020427: Gemini-South Spectroscopic Observations of the Host
  91. IBAS detection of bursts from SGR 1806-20
  92. IPN triangulation of GRB030830 (large error box)
  93. GRB 030824: Candidate Follow-Up
  94. XRF030824: Second-epoch Palomar observations
  95. GRB030823: optical observations
  96. GRB030823: Palomar observations
  97. XRF030824: Palomar observations
  98. GRB030823: optical observation at Tokyo Tech
  99. GRB 030821(=H2814): A Faint, Long GRB Localized by the HETE WXM and the IPN
  100. Summary of recent IPN and HETE detections of SGR bursts

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