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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').
Advanced Search

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.

Advanced Search Examples (click to copy):

subject:"Swift"
body:"GRB"
submitter:"Judith Racusin"

26388 results found.

  1. GRB 031203: z ~ 10 or Fragmented Dust in the Circumburst Environment?
  2. GRB 031203: Apparent Spectral Break
  3. GRB031203: Planned XMM-Newton observation II
  4. GRB 031203: IR REM Observations
  5. GRB031203: Optical Observations
  6. GRB 031203 XMM-Newton observation
  7. GRB031203: Planned XMM-Newton observation
  8. GRB 031203: further analysis of INTEGRAL data
  9. GRB 030329: Planned XMM-Newton Observation
  10. GRB 031111B (= H2925) : Kyoto Optical Observation
  11. IPN triangulation of GRB031114 (large error box)
  12. GRB 031111, optical observations
  13. GRB031026: 1.2mm upper limit with MAMBO at the IRAM 30m
  14. GRB030929/SN2003jd association unlikely based on IPN localiztion
  15. IPN triangulation of GRB031027 (small error box)
  16. Lulin optical follow-up observations of GRB031026
  17. GRB 031026 (=H2882): Evidence for High Redshift from Prompt
  18. IPN triangulation of GRB031024 (single error box)
  19. IPN triangulation of GRB031024 (annulus)
  20. IPN triangulation of GRB031020 (large error box)
  21. XRF 030824: additional observations at CFHT
  22. SGR1806-20 bursts on 031008. Helicon detection and small error box.
  23. XRF 030723: Subaru Optical Observations
  24. XRF 030824: Early follow-up observation at Kiso observatory
  25. XRF 030824: observations at CFHT
  26. IPN triangulation of GRB030922B (large error box)
  27. XRF 030723: Detection of the likely host galaxy
  28. XRF030824 (=H2821): An X-Ray Flash Localized by the HETE WXM
  29. XRF030823 (=H2818): An X-Ray Flash Localized by the HETE WXM and SXC
  30. IPN triangulation of GRB030921 (large error box)
  31. IPN triangulation of GRB030919 (large error box)
  32. GRB030913: Subaru Optical Observations
  33. GRB 030913, optical candidate
  34. GRB 030913, BOOTES observations
  35. IPN triangulation of GRB030916 (possible short/hard GRB; large error box)
  36. GRB030913: wide field imaging (7 sq.deg) of the error box by MASTER
  37. XRF 020427: Gemini-South Spectroscopic Observations of the Host
  38. XRF030824: Optical observations
  39. IPN triangulation of GRB030903 (large error box)
  40. IPN triangulation of GRB030827 (large error box)
  41. GRB030823: optical observations
  42. GRB030823: optical observation at Tokyo Tech
  43. Lulin follow-up observations of GRB030823
  44. GRB 030821(=H2814): A Faint, Long GRB Localized by the HETE WXM and the IPN
  45. IPN detection of continued activity from SGR1806-20
  46. GRB 030817 = H2808 TAROT optical observations
  47. SGR 1808-20 (=H2802): A Possible new SGR
  48. XRF030723(=H2777): Chandra Fading X-ray Afterglow Confirmed
  49. XRF 030723: Detection of a rebrightening in the optical afterglow
  50. XRF030723, BVRcIc field photometry update
  51. IPN triangulation of GRB030801 (large error box)
  52. GRB021206 optical counterpart upper limit
  53. IPN triangulation of GRB030726 (large error box)
  54. IPN triangulation of GRB030721 (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. GRB030725 (=H2779): A Bright GRB Localized by HETE
  61. XRF030723 (= H2777): Chandra Observations Scheduled
  62. XRF030723, BVRcIc field photometry correction
  63. XRF030723, ROTSE-III Early Observations
  64. XRF030723, BVRcIc field photometry
  65. XRF 030723, optical observations
  66. XRF030723 (=H2777): An X-ray Flash Localized by the HETE WXM and
  67. Konus-Wind detection of the bursts from SGR1806-20 region
  68. SGR 1806-20, submm observations
  69. RXTE PCA Observations of SGR1806-20 Region
  70. IPN triangulation of GRB030714 (two large error boxes)
  71. IPN triangulation of GRB030715 (two large error boxes)
  72. GRB030706 triangulation (single large error box)
  73. GRB030329, optical observation in May
  74. IPN triangulation of GRB030626 (single large error box)
  75. IPN triangulation of GRB030626 (two large error boxes)
  76. GRB030329: second XMM-Newton observation
  77. GRB030329 -- RATAN-600 data in April-May
  78. GRB030528(=H2724): X-ray Afterglow Identified in Second Epoch
  79. IPN triangulation of GRB030606 (two alternate error boxes)
  80. GRB 030528: Infrared Observations and the Proposed IR Counterpart
  81. GRB 030528: tentative NIR counterpart
  82. GRB030528(=H2724): Observations with the Chandra X-ray Observatory
  83. GRB030528, BVRI field photometry
  84. GRB030329, SPM optical observations
  85. GRB030528: Chandra TOO Planned
  86. GRB030528(=H2724): Revised SXC Localization
  87. GRB 030528 Bisei optical observation
  88. GRB030528 (H2724): A long GRB localized by HETE
  89. GRB 030329: Correction to GCN 2254
  90. GRB 030329: Optical Observations
  91. GRB 030528 (=H2724) Kyoto optical observation
  92. GRB 030416: Optical Observations
  93. GRB 030329 Optical Observations
  94. GRB030329: XMM-Newton observation
  95. GRB 021004: HST observations
  96. GRB030324: Further Observations of the Candidate Optical Afterglow
  97. GRB030519B (=H2716): Peak Fluxes, Fluences, and Energy Spectrum
  98. IPN triangulation of GRB030519B=H2716 (small error box)
  99. HETE GRB030329, correction to Rc Observations in Loiano
  100. GRB 030329: Optical limit (contemporaneous imaging)

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