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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.

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

3759 results found.

  1. IPN triangulation of GRB030922A (large error box)
  2. IPN triangulation of GRB030919 (large error box)
  3. IPN triangulation of GRB030916 (possible short/hard GRB; large error box)
  4. IBAS detection of bursts from SGR 1806-20
  5. IPN triangulation of GRB030801 (large error box)
  6. XRF030723 (=H2777): An X-ray Flash Localized by the HETE WXM and
  7. IPN triangulation of GRB030714 (two large error boxes)
  8. GRB030329: second XMM-Newton observation
  9. GRB030329 -- RATAN-600 data in April-May
  10. IPN triangulation of GRB030606 (two alternate error boxes)
  11. GRB 030329: optical observations
  12. GRB 030329/SN 2003dh: Jitter Episode
  13. GRB 030528 Bisei optical observation
  14. GRB030528 (H2724): A long GRB localized by HETE
  15. GRB 030528: Optical observations at RIKEN
  16. GRB 030329: optical photometry at Belesta observatory (France)
  17. GRB030329, Optical observations
  18. GRB030429 (=H2695): A Long GRB Localized by the HETE WXM and SXC
  19. GRB030425: CrAO optical observation
  20. GRB 030329, the review of the sky area in plate archive (1950-1998)
  21. GRB 030329: wide-field photograph by R. Tamura 1 hr after the burst
  22. IPN triangulation of GRB030422 (two large error boxes)
  23. GRB030418: Upper limits from recent and historical observations.
  24. OT GRB 030329: early UBVRcIc spectral evolution
  25. OT GRB 030329: early spectrum
  26. GRB030329: VR Photometry at TNG
  27. GRB030328: R upper limit after 6 hours by MASTER
  28. GRB 030329: SARA Optical Observations
  29. GRB 030329, nearby galaxies
  30. GRB030329: final R-band light curve by MASTER
  31. GRB030329 - more 15 GHz radio data
  32. GRB 030329: SARA Optical Observations
  33. GRB 030329, BRI photometry
  34. GRB 030329: Additional Mt. Laguna Optical Observations
  35. AAVSO V & R observations of GRB030329
  36. GRB 030329: optical observations
  37. GRB 030329: Optical pre-Imaging
  38. GRB030328: R optical observation
  39. GRB030329 (=H2652): A Long, Extremely Bright GRB Localized by the HETE WXM and SXC
  40. RXTE detection of GRB 030329 afterglow
  41. GRB 030328: Optical observations
  42. GRB 030328: OT photometry
  43. GRB030328: optical spectroscopy at TNG
  44. GRB030328 (=H2650): A Long, Bright GRB Localized by the HETE WXM and SXC
  45. GRB 030328: Optical afterglow candidate
  46. GRB030323 optical observations
  47. GRB030131, BVRcIc field photometry
  48. GRB030323 (=H2640): A Faint, Long GRB Localized by the HETE WXM and SXC
  49. GRB030323, optical observations
  50. 030228: NOT A GRB
  51. GRB030227:Optical observations
  52. GRB 030131: marginal optical detection
  53. GRB030131: Candidate Optical Afterglow
  54. GRB 030131: afterglow candidate
  55. IPN triangulation of GRB030119 (two large error boxes)
  56. IPN triangulation of GRB030115C (large error box)
  57. IPN triangulation of GRB021219 - CORRECTION
  58. Chandra observation of the IPN error box of GRB021201 (short/hard)
  59. GRB 021201: BOOTES simultaneous optical observations
  60. GRB021125 refined position
  61. Improved IPN error box for GRB021125
  62. IPN BURST POSITION
  63. IPN triangulation of GRB021125 (INTEGRAL BURST)
  64. GRB021112 (=H2448): A Long GRB Localized by HETE
  65. IPN triangulation of GRB021020 (smaller error box)
  66. IPN triangulation of GRB021013 (single error box)
  67. IPN triangulation of GRB021013 (two small error boxes)
  68. GRB021004: BVRc photometry
  69. GRB021004, Optical Observations
  70. GRB 021004: Optical Photometry at 1.5 Days
  71. GRB 021004: Optical Observations
  72. GRB 021004, SPM optical observations
  73. GRB 020812: optical observation at Bisei
  74. IPN triangulation of GRB020813
  75. GRB 020812 optical observation
  76. IPN triangulation of GRB020708
  77. GRB 020625, optical observations
  78. GRB 020531: optical photometry of Chandra sources
  79. GRB020625 (=H2081): A Long Burst Localized by HETE
  80. GRB 020604, optical observations
  81. GRB020531: Observations with the Chandra X-ray Observatory
  82. Refined IPN error box for GRB020531
  83. IPN triangulation of the short, hard GRB020531 (=H2042)
  84. XRF 020427
  85. GRB020410: BeppoSAX NFI observations refined analysis
  86. GRB 020321: Candidate X-ray Counterparts
  87. GRB020317 : Near IR Observations from Mt Abu Observatory
  88. GRB020127: Comparison of Chandra Epochs and Identification of Possible Counterparts
  89. GRB020127: Chandra Observations and Prospective Counterparts
  90. GRB020127: Optical observations
  91. GRB 020127, I-band observations starting 3.14-hr after the event
  92. GRB010921 Optical Observations
  93. GRB011211: BeppoSAX/GRBM data
  94. GRB 011211, Optical Observations
  95. GRB011130 (=XRF011130): Further analysis of Chandra Target of
  96. The X-ray Flash 011030 ('GRB 011030')
  97. BeppoSAX ALERT: Possible X-ray rich GRB011030
  98. GRB010928(=H1770): Localization of a Long GRB by HETE
  99. GRB 010222: HST observations -- host galaxy and late-time decay
  100. GCN and HETE status

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