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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"

32510 results found.

  1. Summary of recent bursts from SGR 1806-20 detected by INTEGRAL
  2. GRB040323: NIR Observations and Variable Object
  3. GRB 040319 (=H3128): An X-Ray-Rich GRB Localized by the HETE-2 WXM and SXC
  4. GRB 040323, a dark GRB ?
  5. GRB040223: Deep NIR NTT data re-analysis
  6. GRB 040223: XMM-Newton results
  7. GRB040223, improved XMM position
  8. GRB 031203: spectoscopic evidence for a 1998bw-like SN
  9. GRB 031203, possible supernova
  10. IBAS results on a burst from SGR1806-20
  11. GRB 040228 Optical observations
  12. IPN triangulation of GRB040228 (H3066, H3067)
  13. GRB 040228 (=H3066?,=H3067?): A Long GRB Localized by the HETE-2 WXM
  14. GRB 040223: Deep NIR NTT observations
  15. GRB 040223 : Optical observation (non-detection)
  16. XMM-Newton Images of GRB 040223
  17. GRB 040223, VLA observations
  18. GRB 040223: REM IJK Observations
  19. GRB 040223 XMM-Newton observation ...
  20. GRB 031203 XMM-Newton observation
  21. GRB031111, optical observations
  22. GRB031220: 2nd Chandra observation and X-ray afterglow candidate
  23. GRB031203: Chandra Observations
  24. GRB040106, follow-up radio observations
  25. GRB040106: refined X-ray transient position
  26. Follow-up on IBAS GRB Alert 1379
  27. SN 2003dh/GRB030329 late-time optical spectroscopy
  28. GRB040106, Radio Observations
  29. GRB040106, likely optical afterglow
  30. GRB040106: Second Epoch Optical Observations
  31. GRB 031220: Optical observations of Chandra X-ray sources
  32. XMM-Newton Images of GRB 040106
  33. GRB040106: optical observations with REM+ROSS
  34. GRB031220: observation at Univercity of Miyazaki
  35. GRB 040106: Optical observations
  36. XMM-Newton observation of GRB040106
  37. GRB031220(=H2976): TNG R-band Observation of the Chandra X-ray Sources
  38. GRB031220(=H2976): Observation with the Chandra X-ray Observatory
  39. GRB 031203 I-band monitoring
  40. IPN triangulation of GRB031214 (short/hard; very intense; small error box)
  41. GRB 2974 follow-up observations
  42. GRB031203, improved XMM position
  43. GRB 031203: SMARTS optical monitoring
  44. GRB 021203: A Normal GRB viewed far off axis?
  45. GRB 031203: Variable Radio Source
  46. GRB 031203: Magellan spectrum of possible GRB host
  47. GRB 031203: Optical/IR Astrometry
  48. GRB031203 K prime photometry: correction to galaxy coordinates
  49. GRB031203: ROSAT upper limits suggest XMM-S1 source as the transient
  50. XMM-Newton Observation of GRB031203
  51. GRB031203: K' Photometry of the likely GRB host
  52. XMM-Newton Observation of GRB031203
  53. GRB 031203: Radio detection
  54. GRB 031203: Further reports on December 4 observations
  55. GRB 031203: IR NTTobservations do not confirm REM detection
  56. GRB 031203: z ~ 10 or Fragmented Dust in the Circumburst Environment?
  57. GRB 031203: Apparent Spectral Break
  58. GRB031203: Planned XMM-Newton observation II
  59. GRB 031203: IR REM Observations
  60. GRB031203: Optical Observations
  61. GRB 031203 XMM-Newton observation
  62. GRB 031203: Optical/IR SMARTS Observations
  63. GRB031203: Planned XMM-Newton observation
  64. GRB031111A, prompt optical observations
  65. GRB 031111, Radio observations
  66. GRB 031111: Optical observations
  67. GRB 031111, optical observations
  68. SN 2003jd (SN/GRB?) -- X-ray Observations
  69. IPN triangulation of GRB031111 (=H2924): small error box
  70. XRF031109 (=H2919): A very long XRF localized by HETE
  71. GRB031026: 1.2mm upper limit with MAMBO at the IRAM 30m
  72. GRB030929/SN2003jd association unlikely based on IPN localiztion
  73. Lulin optical follow-up observations of GRB031026
  74. SN 2003jd (SN/GRB?), Radio Observations
  75. SN 2003jd (SN/GRB?) - possible association with GRB 030929
  76. GRB 031026: Further Ic Observations
  77. GRB 031026 (=H2882): Evidence for High Redshift from Prompt
  78. Peculiar Type Ic SN 2003jd (SN/GRB?), optical spectrum
  79. IPN triangulation of GRB031024 (single error box)
  80. GRB031026 (=H2882): A Long, Hard Spectrum Burst Localized by HETE
  81. XRF 030824: additional observations at CFHT
  82. SGR1806-20 bursts on 031008. Helicon detection and small error box.
  83. SGR 1806-20 bursts with INTEGRAL and IBAS announcement on Soft Gamma-Ray Repeaters
  84. XRF 030723: Subaru Optical Observations
  85. XRF 030824: Early follow-up observation at Kiso observatory
  86. XRF 030723: Detection of the likely host galaxy
  87. XRF030824 (=H2821): An X-Ray Flash Localized by the HETE WXM
  88. XRF030823 (=H2818): An X-Ray Flash Localized by the HETE WXM and SXC
  89. IPN triangulation of GRB030922A (large error box)
  90. IPN triangulation of GRB030921 (large error box)
  91. GRB030913: Subaru Optical Observations
  92. GRB 030913: ROTSE-3c Optical Observations
  93. GRB030913: OT's limit by MASTER
  94. GRB030913, candidate afterglow observations
  95. GRB030913: AAVSO optical observations
  96. GRB030913 (=H2849): Confirmation of the Flight Localization
  97. GRB030913 (=H2849): TAROT Observations
  98. Magellan Observations of GRB030725 (=H2779)
  99. GRB030913 (=H2849): A GRB Possibly Localized by HETE
  100. IBAS detection of bursts from SGR 1806-20

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