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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"

15722 results found.

  1. GRB 040812: Keck and LCO optical observations
  2. GRB040812, optical/IR observations
  3. GRB 040810: Optical observations of a limited region
  4. XRF040701: Optical Observations at ESO
  5. GRB 040730: Optical observations
  6. GRB040624: optical monitoring at TNG
  7. XRF 040701 - optical observations of the decaying Chandra source
  8. GRB040624, optical observations
  9. XRF 040701, optical observations
  10. XRF040701 (=U11548): a bright XRF detected by HETE
  11. GRB 040624: optical observations
  12. Optical Observations of GRB040624
  13. GRB 040624: optical observations at TNG and VLT
  14. MASTER: GRB 040624 optical observation after 0,48d
  15. GRB 040624: R-band observations
  16. GRB 040624, optical observations
  17. GRB 030329: Rebrightening of hyperluminal ejecta.
  18. GRB040511: Retraction of redshift identification
  19. MASTER:HETE Alert 3259 (SRG1806-20) optical observation
  20. GRB 040606: Optical observations
  21. MASTER: HETE Alert 3274 optical observation
  22. GRB 040511: NIR observations with REM
  23. GRB 040511: Optical limit
  24. GRB040511: Candidate optical/NIR afterglow
  25. GRB 040511: ROTSE-III Rapid Optical Upper Limits
  26. GRB 040511: Second Epoch Optical Observations
  27. GRB 040511: Optical observations
  28. GRB 040511: Optical Observations
  29. GRB040511: Optical Observations
  30. GRB040511: Optical Observations
  31. GRB040511 (=H3218): A Long GRB Localized by HETE WXM and SXC
  32. Type Ic SN2001em (off-axis GRB jet?), optical spectrum
  33. On Line Availability of Archival HETE Fregate Data and Lightcurves
  34. GRB040422: optical observations at Xinglong Observatory
  35. GRB040422: optical observations at CrAO
  36. GRB 040423 (=H3175): A Long GRB Localized by HETE
  37. GRB040422, optical observations at Loiano
  38. GRB 040422: ROTSE-IIIb Prompt Optical Limits
  39. GRB 040422,optical observation
  40. GRB040422: optical and NIR observations at the VLT
  41. GRB 040403, deep optical observations
  42. MASTER: HETE Alert 3163, 3167 technical optical observation
  43. GRB 040403: Optical Observations
  44. GRB 040403 Optical Observations
  45. GRB 040403: Optical observations
  46. GRB 040403: optical observations
  47. GRB 040403: Optical Observations
  48. GRB040323: NIR Observations and Variable Object
  49. GRB 040319 (=H3128): An X-Ray-Rich GRB Localized by the HETE-2 WXM and SXC
  50. GRB 040323, a dark GRB ?
  51. GRB040223, improved XMM position
  52. GRB 031203: spectoscopic evidence for a 1998bw-like SN
  53. MASTER: RXTE GRB040308 optical observation
  54. RXTE GRB040229 optical observation: no candidate
  55. GRB 040228 Optical observations
  56. GRB040228 : KISO optical follow-up observation
  57. GRB 040228 (=H3066?,=H3067?): A Long GRB Localized by the HETE-2 WXM
  58. GRB 040223 : Optical observation (non-detection)
  59. GRB031111, optical observations
  60. GRB031220: 2nd Chandra observation and X-ray afterglow candidate
  61. GRB040106: refined X-ray transient position
  62. SN 2003dh/GRB030329 late-time optical spectroscopy
  63. GRB040106, Radio Observations
  64. GRB040106, likely optical afterglow
  65. GRB040106: Second Epoch Optical Observations
  66. GRB 031220: Optical observations of Chandra X-ray sources
  67. GRB040106: optical observations with REM+ROSS
  68. GRB 040106: Optical observations
  69. GRB031220(=H2976): TNG R-band Observation of the Chandra X-ray Sources
  70. GRB 031220 : Kyoto Optical Observation
  71. GRB 031220: Optical observation at Tokyo Tech
  72. GRB031220: ROTSE-IIIb Optical Limits
  73. GRB031220 : Optical Observation of Lulin Observatory
  74. GRB 031203 I-band monitoring
  75. GRB 031203: Discovery of a dust echo
  76. GRB 031203: SMARTS optical monitoring
  77. GRB 031203: Optical/IR Astrometry
  78. IPN/HETE localization of GRB031203B (=H2949; large error box)
  79. GRB031203 : Optical Observation of Lulin Observatory
  80. GRB031203: Optical Observations
  81. GRB 031203: Optical/IR SMARTS Observations
  82. GRB031111A, prompt optical observations
  83. GRB 031111B (= H2925) : Kyoto Optical Observation
  84. GRB 031111: Optical observations
  85. GRB 031111, optical observations
  86. SN 2003jd (SN/GRB?) -- X-ray Observations
  87. XRF031109 (=H2919): A very long XRF localized by HETE
  88. Lulin optical follow-up observations of GRB031026
  89. GRB 031026 (=H2882): Evidence for High Redshift from Prompt
  90. Peculiar Type Ic SN 2003jd (SN/GRB?), optical spectrum
  91. GRB031026 (=H2882): A Long, Hard Spectrum Burst Localized by HETE
  92. GRB031026 : KISO optical follow-up observation
  93. IPN detection of continued activity from SGR1806-20
  94. XRF 030723: Subaru Optical Observations
  95. XRF 030723: Detection of the likely host galaxy
  96. XRF030824 (=H2821): An X-Ray Flash Localized by the HETE WXM
  97. XRF030823 (=H2818): An X-Ray Flash Localized by the HETE WXM and SXC
  98. GRB030913: Subaru Optical Observations
  99. GRB 030913: ROTSE-3c Optical Observations
  100. GRB030913, candidate afterglow observations

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