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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"

19551 results found.

  1. GRB030528(=H2724): Observations with the Chandra X-ray Observatory
  2. GRB030528, BVRI field photometry
  3. GRB030329, SPM optical observations
  4. GRB030528(=H2724): Revised SXC Localization
  5. GRB 030528 Bisei optical observation
  6. GRB030528 (H2724): A long GRB localized by HETE
  7. GRB 030528 (=H2724) Kyoto optical observation
  8. GRB030329, Optical observations
  9. GRB 030329 Optical Observations
  10. GRB 021004: HST observations
  11. GRB030324: Further Observations of the Candidate Optical Afterglow
  12. GRB030519B (=H2716): Peak Fluxes, Fluences, and Energy Spectrum
  13. HETE GRB030329, correction to Rc Observations in Loiano
  14. GRB 030329: Optical limit (contemporaneous imaging)
  15. IPN triangulation of GRB030509 (small errror box)
  16. IPN triangulation of GRB030509 - correction
  17. IPN triangulation of GRB030509 (single error box)
  18. GRB030429, refiend optical brightness
  19. GRB030418, BVRcIc field photometry
  20. GRB030429, BVRcIc field photometry
  21. GRB030329: RTT150 optical observations and upper limit for a host
  22. GRB 030429: redshift from VLT spectroscopy
  23. GRB030501: TAROT candidate afterglow present in archival images
  24. IPN triangulation of GRB030501B (annulus)
  25. GRB 030429: confirmation of afterglow candidate
  26. GRB 030329 Oprical observations in Rozhen observatory
  27. GRB030329, SPM optical observations
  28. GRB 030329, the review of the sky area in plate archive (1950-1998)
  29. GRB 030329: wide-field photograph by R. Tamura 1 hr after the burst
  30. GRB030329: optical polarization
  31. MASTER:optical observations GRB030418
  32. MASTER:optical observations probable GRB030414
  33. GRB030418: Upper limits from recent and historical observations.
  34. GRB030418: Kiso near infrared observations
  35. GRB030329: Optical Observations
  36. GRB 030329: SARA Optical Observations
  37. OT GRB 030329: early spectrum
  38. IPN triangulation of GRB030414 (small error box)
  39. GRB 030329 and SN 2003dh
  40. GRB030329, optical position
  41. GRB 030329 VLBA Observations
  42. GRB 030329, light curve flattens
  43. Kiso observation of the GRB030329 at April 6
  44. GRB 030329, color evolution
  45. GRB030328, UBVRcIc field photometry
  46. GRB 030329 Optical observations
  47. GRB 030329, color evolution
  48. GRB030329: Kiso B and R band observations
  49. SDSS 0.5m PT observations of GRB030329 (correction)
  50. SDSS 0.5m PT observations of GRB030329
  51. GRB030329: final R-band light curve by MASTER
  52. GRB030329, new UBVRcIc field photometry
  53. GRB 030329 , SPM optical observations
  54. GRB030329: Optical observations at Teramo
  55. GRB 030329: Radio observations at GMRT
  56. GRB 030329: Additional Mt. Laguna Optical Observations
  57. GRB 030329: Observations with ANDICAM
  58. GRB 030329: optical observations
  59. GRB 030324: Optical and NIR Observations
  60. GRB030329: R band light curve by MASTER
  61. GRB030329 - Light curve flattening
  62. GRB 030324, optical search
  63. GRB 030329, optical observations
  64. GRB030328: X-ray Fading and Spectrum Measured with Chandra
  65. GRB030329, BVRcIc field photometry
  66. GRB030329, SPM optical observations
  67. GRB 030329, optical photometry
  68. GRB030329 optical observations
  69. GRB 030329: Optical pre-Imaging
  70. GRB 030329: visual observations
  71. GRB 030329: Upper limit from 5.6 hours before trigger
  72. GRB030328: X-ray Afterglow Observed with Chandra
  73. GRB 030329, R-band observations
  74. GRB030329: Upper limits from recent and historical observations.
  75. GRB 030329: Optical Afterglow Observations
  76. GRB 030329: precise position from Kyoto images
  77. GRB 030328: Optical observations
  78. GRB 030328: optical observations
  79. GRB 030329: Optical afterglow fading
  80. GRB 030328: OT photometry
  81. GRB030328: optical photometry at the TNG
  82. GRB030328 (=H2650): A Long, Bright GRB Localized by the HETE WXM and SXC
  83. GRB 030328: Optical observations
  84. GRB030324 optical observation
  85. GRB030131, BVRcIc field photometry
  86. Possible GRB030323 localized by INTEGRAL
  87. GRB030323: Detection on 2003/03/24
  88. GRB030323: V, R, I photometry
  89. VLT/FORS2 spectra of GRB 030323
  90. GRB030323, optical observations
  91. GRB030324, BVRcIc field photometry
  92. GRB030323, BVRcIc field calibration
  93. Possible GRB 030320 localized by INTEGRAL
  94. GRB 030226: Optical observations
  95. GRB030226: Analysis of Chandra data
  96. GRB030226, BVRc observations
  97. Chandra detection of the X-ray afterglow of GRB 030226
  98. GRB030227: Kiso optical upper limit
  99. GRB030227, BVRcIc field photometry
  100. GRB030226, BVRcIc field calibration

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