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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"

17851 results found.

  1. XMM-Newton Images of GRB 040106
  2. GRB031220: observation at Univercity of Miyazaki
  3. XMM-Newton observation of GRB040106
  4. GRB031220(=H2976): TNG R-band Observation of the Chandra X-ray Sources
  5. GRB031220(=H2976): Observation with the Chandra X-ray Observatory
  6. GRB 031220 : Kyoto Optical Observation
  7. GRB 031220: Subaru observation
  8. GRB 031220: Optical observation at Tokyo Tech
  9. GRB 2974 follow-up observations
  10. GRB031203, improved XMM position
  11. XMM-Newton Observations of GRB031203: Preliminary Images
  12. IPN/HETE localization of GRB031203B (=H2949; large error box)
  13. GRB031203: ROSAT upper limits suggest XMM-S1 source as the transient
  14. XMM-Newton Observation of GRB031203
  15. XMM-Newton Observation of GRB031203
  16. GRB 031203: IR NTTobservations do not confirm REM detection
  17. GRB 031203: Apparent Spectral Break
  18. GRB031203: Planned XMM-Newton observation II
  19. GRB 031203: IR REM Observations
  20. GRB031203: Optical Observations
  21. GRB 031203 XMM-Newton observation
  22. GRB031203: Planned XMM-Newton observation
  23. GRB 030329: Planned XMM-Newton Observation
  24. GRB 031111B (= H2925) : Kyoto Optical Observation
  25. GRB 031111, optical observations
  26. XRF031109 (=H2919): A very long XRF localized by HETE
  27. IPN triangulation of GRB031108 (large error box)
  28. GRB031026: 1.2mm upper limit with MAMBO at the IRAM 30m
  29. GRB030929/SN2003jd association unlikely based on IPN localiztion
  30. IPN triangulation of GRB031027 (small error box)
  31. Lulin optical follow-up observations of GRB031026
  32. IPN triangulation of GRB031024 (single error box)
  33. XRF 030824: additional observations at CFHT
  34. XRF 030723: Subaru Optical Observations
  35. XRF 030824: Early follow-up observation at Kiso observatory
  36. XRF 030723: Detection of the likely host galaxy
  37. IPN triangulation of GRB030919 (large error box)
  38. GRB030913: Subaru Optical Observations
  39. GRB 030913, optical candidate
  40. GRB 030913, BOOTES observations
  41. GRB030913: wide field imaging (7 sq.deg) of the error box by MASTER
  42. XRF030824: Optical observations
  43. IPN triangulation of GRB030903 (large error box)
  44. IBAS detection of bursts from SGR 1806-20
  45. Radio Observations of SGR1806-20
  46. GRB030823: optical observation at Tokyo Tech
  47. Lulin follow-up observations of GRB030823
  48. GRB 030817 = H2808 TAROT optical observations
  49. SGR 1808-20 (=H2802): A Possible new SGR
  50. XRF030723(=H2777): Chandra Fading X-ray Afterglow Confirmed
  51. XRF030723, BVRcIc field photometry update
  52. IPN triangulation of GRB030801 (large error box)
  53. GRB021206 optical counterpart upper limit
  54. IPN triangulation of GRB030726 (large error box)
  55. XRF030723 Radio Observations
  56. XRF 030723: confirmation of fading optical counterpart
  57. XRF030723(=H2777): Chandra Observations
  58. GRB030723: Upper limits from historical observations
  59. XRF030723: Palomar observations and proposed counterpart
  60. XRF030723, BVRcIc field photometry correction
  61. XRF030723, ROTSE-III Early Observations
  62. XRF030723, BVRcIc field photometry
  63. XRF 030723, optical observations
  64. XRF030723, optical observations
  65. XRF030723 (=H2777): An X-ray Flash Localized by the HETE WXM and
  66. SGR 1806-20, submm observations
  67. RXTE PCA Observations of SGR1806-20 Region
  68. GRB030329: Subaru Optical Spectroscopy
  69. GRB030329, optical observation in May
  70. IPN triangulation of GRB030626 (single large error box)
  71. IPN triangulation of GRB030626 (two large error boxes)
  72. HETE detection of burst from SGR1806-20
  73. GRB030528(=H2724): X-ray Afterglow Identified in Second Epoch
  74. GRB 030528: Infrared Observations and the Proposed IR Counterpart
  75. GRB 030528: tentative NIR counterpart
  76. GRB030528(=H2724): Observations with the Chandra X-ray Observatory
  77. GRB030528, BVRI field photometry
  78. GRB030329, SPM optical observations
  79. GRB030528(=H2724): Revised SXC Localization
  80. GRB 030528 Bisei optical observation
  81. GRB 030528 (=H2724) Kyoto optical observation
  82. GRB 030329 Optical Observations
  83. GRB 021004: HST observations
  84. GRB030324: Further Observations of the Candidate Optical Afterglow
  85. HETE GRB030329, correction to Rc Observations in Loiano
  86. GRB 030329: Optical limit (contemporaneous imaging)
  87. IPN triangulation of GRB030509 (single error box)
  88. GRB030429, refiend optical brightness
  89. GRB030418, BVRcIc field photometry
  90. GRB030429, BVRcIc field photometry
  91. GRB030418 (=H2686): A Long, X-Ray-Rich GRB Localized by the HETE WXM
  92. GRB030329: RTT150 optical observations and upper limit for a host
  93. GRB030329: RTT150 optical observations and upper limit for a host
  94. GRB 030429: redshift from VLT spectroscopy
  95. GRB030501: TAROT candidate afterglow present in archival images
  96. GRB 030429: confirmation of afterglow candidate
  97. GRB 030329 Oprical observations in Rozhen observatory
  98. GRB030329, SPM optical observations
  99. GRB 030329, the review of the sky area in plate archive (1950-1998)
  100. GRB 030329: wide-field photograph by R. Tamura 1 hr after the burst

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