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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"

5402 results found.

  1. GRB 050215b: Swift XRT Observations
  2. GRB 050209 Optical observations
  3. GRB 050209: Optical observation
  4. GRB 050202: Short burst detected by Swift-BAT
  5. GRB 050129: a weak long GRB detected with INTEGRAL
  6. GRB050126: Burst Parameters Measured by BAT
  7. GRB 050126: Prompt XRT detection and localization
  8. GRB050124,optical observation
  9. GRB050124: Updated Swift XRT Position and Fluxes
  10. GRB050124: Swift-BAT position of a double-peaked burst
  11. GRB050117: Palomar WIRC Ks-band observations
  12. GRB050117b: Swift-BAT detection of a weak burst
  13. Second Epoch VLA observations of SGR 1806-20
  14. GRB041223: optical and NIR observations with REM
  15. GRB041219: Confirmed NIR Afterglow
  16. GRB 041218: Optical Observation
  17. GRB 041211: Infrared Observations
  18. GRB 041211: KAIT observations
  19. SGR 1806-20 still active
  20. GRB040929,optical observation
  21. XRF 040912, identification of CXO sources
  22. GRB040916 (= H3558): A Long XRF Localized by HETE
  23. IBAS GRB Alerts 1978-1980
  24. GRB040903 - A XRF?
  25. GRB040903, REM near-IR observation
  26. Possible GRB 040903 - further analysis
  27. Bursting activity from SGR 1806-20 detected with IBAS
  28. GRB 040730: a long GRB detected with INTEGRAL
  29. GRB040709 J,H-band observations
  30. IPN Summary of SGR1806-20 Activity in 2004
  31. GRB 040606: Optical observations
  32. Activivty of SGR 1806-20
  33. HETE/IPN localization of GRB040403A (=H3143, a long burst) and GRB040403B(=H3144, a short/hard burst)
  34. GRB 040403: Optical Observations
  35. GRB 040403 Optical Observations
  36. Summary of recent bursts from SGR 1806-20 detected by INTEGRAL
  37. GRB 031203: spectoscopic evidence for a 1998bw-like SN
  38. GRB031220: observation at Univercity of Miyazaki
  39. GRB 031220: Optical observation at Tokyo Tech
  40. IPN triangulation of GRB031214 (short/hard; very intense; small error box)
  41. GRB 2974 follow-up observations
  42. GRB 031203: Discovery of a dust echo
  43. GRB031203: ROSAT upper limits suggest XMM-S1 source as the transient
  44. GRB031203: Optical Observations
  45. GRB031203: Planned XMM-Newton observation
  46. Lulin optical follow-up observations of GRB031026
  47. SGR1806-20 bursts on 031008. Helicon detection and small error box.
  48. SGR 1806-20 bursts with INTEGRAL and IBAS announcement on Soft Gamma-Ray Repeaters
  49. IBAS detection of bursts from SGR 1806-20
  50. INTEGRAL ToO OBSERVATIONS OF SGR1806-20: CALL FOR CORRELATED OBSERVATIONS
  51. H2768, H2770, and H2771: Three Bursts from SGR1806-20
  52. GRB030329: RTT150 optical observations
  53. GRB030629 triangulation (Konus-Wind -- Helicon annulus)
  54. GRB030418: R optical observations
  55. GRB030528 (H2724): A long GRB localized by HETE
  56. GRB030329, Optical observations
  57. XRF030416 (=U10897): An X-Ray Flash Localized by the HETE WXM
  58. GRB030429: RTT150 optical observations, a possible host galaxy
  59. GRB030329: RTT150 optical observations and upper limit for a host
  60. GRB030329: RTT150 optical observations and upper limit for a host
  61. GRB030501 localized by INTEGRAL
  62. GRB030329: optical polarization
  63. GRB030329: 444 AAVSO Measurements
  64. GRB 030329: SARA Optical Observations
  65. IPN triangulation of GRB030414 (small error box)
  66. GRB 030329: possible color change
  67. GRB030329: Kiso B and R band observations
  68. GRB030329: More AAVSO VR obs
  69. GRB030328: R upper limit after 6 hours by MASTER
  70. GRB 030329: SARA Optical Observations
  71. GRB 030329, BVRI photometry
  72. GRB030329: final R-band light curve by MASTER
  73. GRB030329 Radio 23/43/90 GHz observations at Nobeyama
  74. GRB 030329: SARA Optical Observations
  75. GRB 030329, BRI photometry
  76. Further AAVSO V,B,R observations of GRB030329
  77. GRB 030329: SARA Optical Observations
  78. GRB 030329: Observations with ANDICAM
  79. GRB030329: further optical photometry and evidence for a light curve discontinuity
  80. GRB 030329: Correction to GCN 2056
  81. AAVSO V & R observations of GRB030329
  82. GRB 030329: optical observations
  83. GRB030329 15 GHz radio observation
  84. 030331 NOT A GRB
  85. GRB030329: R and B observations
  86. GRB030329, SPM optical observations
  87. GRB 030329: Optical Decay
  88. GRB030329: optical spectroscopy with the TNG
  89. GRB 030328 Optical Observations
  90. GRB030328: Decay index
  91. GRB030323 optical observations
  92. GRB030323: Detection on 2003/03/24
  93. GRB 030323: SARA Optical Observations
  94. GRB030324 (=H2641): A Long GRB Localized in Real Time by the HETE WXM
  95. GRB 030227: Optical limit at RIKEN
  96. GRB 030226 Optical observations
  97. Chandra detection of the X-ray afterglow of GRB 030226
  98. GRB030227: Kiso optical upper limit
  99. 030302: NOT A GRB
  100. Possible break in the GRB 030226 light curve

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