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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"

24368 results found.

  1. GRB040422 : I-band follow-up observation at Lulin Observatory
  2. GRB 040422: ROTSE-IIIb Prompt Optical Limits
  3. GRB 040422,optical observation
  4. GRB 040422: a long GRB detected with INTEGRAL
  5. MASTER: HETE Alert 3163, 3167 technical optical observation
  6. INTEGRAL-SPI/ACS GRB data: timing correction
  7. IBAS GRB alerts 1739, 1740, 1741
  8. HETE/IPN localization of GRB040403A (=H3143, a long burst) and GRB040403B(=H3144, a short/hard burst)
  9. GRB 040403: Optical Observations
  10. GRB 040403: Optical observations
  11. GRB 040403: a long GRB detected with INTEGRAL
  12. Summary of recent bursts from SGR 1806-20 detected by INTEGRAL
  13. IBAS GRB Alert 1694
  14. GRB040323: NIR Observations and Variable Object
  15. GRB 040319 (=H3128): An X-Ray-Rich GRB Localized by the HETE-2 WXM and SXC
  16. GRB 040323, a dark GRB ?
  17. GRB 040323: a long GRB detected with INTEGRAL
  18. IBAS GRB alerts 1679, 1680, 1681
  19. IBAS Alert 1678: not a GRB
  20. GRB 031203: spectoscopic evidence for a 1998bw-like SN
  21. GRB 031203, possible supernova
  22. IBAS results on a burst from SGR1806-20
  23. INTEGRAL detection of activity from SGR1806-20
  24. RXTE GRB040229 optical observation: no candidate
  25. GRB 040228 Optical observations
  26. GRB 040228 (=H3066?,=H3067?): A Long GRB Localized by the HETE-2 WXM
  27. GRB 040223: further offline analysis
  28. GRB 040223: a long GRB detected with INTEGRAL
  29. GRB031111, optical observations
  30. GRB031220: 2nd Chandra observation and X-ray afterglow candidate
  31. Follow-up on IBAS GRB Alert 1379
  32. IBAS GRB alert 1379
  33. SN 2003dh/GRB030329 late-time optical spectroscopy
  34. GRB040106: Second Epoch Optical Observations
  35. GRB040106: optical observations with REM+ROSS
  36. GRB031220: observation at Univercity of Miyazaki
  37. GRB 040106 : peak flux
  38. GRB 040106 : a long GRB detected with INTEGRAL
  39. GRB031220(=H2976): TNG R-band Observation of the Chandra X-ray Sources
  40. IPN triangulation of GRB031219 (large error box)
  41. GRB031220: Palomar Observations
  42. GRB 031220: Optical observation at Tokyo Tech
  43. GRB031220: ROTSE-IIIb Optical Limits
  44. GRB 031203: SMARTS optical monitoring
  45. GRB 031203: Optical/IR Astrometry
  46. IPN/HETE localization of GRB031203B (=H2949; large error box)
  47. GRB031203: ROSAT upper limits suggest XMM-S1 source as the transient
  48. XMM-Newton Observation of GRB031203
  49. XMM-Newton Observation of GRB031203
  50. GRB 031203: Radio detection
  51. GRB031203 : Optical Observation of Lulin Observatory
  52. GRB 031203: Apparent Spectral Break
  53. GRB031203: Planned XMM-Newton observation II
  54. GRB 031203: Optical/IR SMARTS Observations
  55. IPN triangulation of GRB031127A and B (quasi-simultaneous; large error boxes)
  56. GRB 031203: further analysis of INTEGRAL data
  57. GRB 031203: A long GRB detected with INTEGRAL
  58. IPN triangulation of GRB031201 (large error box)
  59. IPN triangulation of GRB031130 (large error box)
  60. GRB031111A, prompt optical observations
  61. IPN triangulation of GRB031120 (two large error boxes)
  62. IPN/HETE localization of GRB031109 (=H2917; large error box)
  63. IPN triangulation of GRB031107 (two large error boxes)
  64. GRB 031111, optical observations
  65. HETE Prompt GRB Spectral Analyses
  66. XRF031109 (=H2919): A very long XRF localized by HETE
  67. GRB031026: 1.2mm upper limit with MAMBO at the IRAM 30m
  68. GRB030929/SN2003jd association unlikely based on IPN localiztion
  69. Lulin optical follow-up observations of GRB031026
  70. SN 2003jd (SN/GRB?) - possible association with GRB 030929
  71. GRB 031026: Further Ic Observations
  72. GRB 031026 (=H2882): Evidence for High Redshift from Prompt
  73. IPN triangulation of GRB031024 (single error box)
  74. GRB031026 (=H2882): A Long, Hard Spectrum Burst Localized by HETE
  75. GRB 031026: Ic Observations
  76. IPN triangulation of GRB031024 (annulus)
  77. IBAS alert 1180 refers to a burst from SGR 1806-20
  78. HETE Prompt GRB Light Curves and Color-Color Diagrams
  79. Ongoing Bursting Activity from SGR 1806-20 detected with IBAS
  80. SGR 1806-20 bursts with INTEGRAL and IBAS announcement on Soft Gamma-Ray Repeaters
  81. IPN detection of continued activity from SGR1806-20
  82. IPN triangulation of GRB031007 (two large error boxes)
  83. A burst from SGR 1806-20 detected with IBAS
  84. XRF030824 (=H2821): An X-Ray Flash Localized by the HETE WXM
  85. XRF030823 (=H2818): An X-Ray Flash Localized by the HETE WXM and SXC
  86. GRB030922 triangulation (annulus)
  87. GRB030913: OT's limit by MASTER
  88. GRB030913, candidate afterglow observations
  89. GRB030913 (=H2849): Confirmation of the Flight Localization
  90. GRB030913: wide field imaging (7 sq.deg) of the error box by MASTER
  91. Magellan Observations of GRB030725 (=H2779)
  92. GRB030913 (=H2849): A GRB Possibly Localized by HETE
  93. XRF 020427: Gemini-South Spectroscopic Observations of the Host
  94. IBAS detection of bursts from SGR 1806-20
  95. IPN triangulation of GRB030830 (large error box)
  96. GRB 030824: Candidate Follow-Up
  97. XRF030824: Second-epoch Palomar observations
  98. GRB030823: optical observations
  99. GRB030823: Palomar observations
  100. XRF030824: Palomar observations

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